CN115534595B - Monitoring system and monitoring method - Google Patents

Abstract

The invention discloses a monitoring system and a monitoring method. The monitoring system comprises a monitoring device and a control device, wherein the monitoring device is used for being fixed to a tire so as to monitor the pressure born by the tire and generate a monitoring signal, the control device is in wireless connection with the monitoring device, the control device is used for receiving the monitoring signal sent by the monitoring device and can convert the monitoring signal into an actual footprint image of the tire, at least one preset footprint image is stored in the control device, and the control device compares the actual footprint image with the at least one preset footprint image so as to judge whether the wheel positioning is qualified or not. According to the monitoring method provided by the invention, whether the wheel positioning is qualified or not can be timely judged, and the actual condition of the tire can be timely monitored, so that the judgment can be timely made.

Description

A monitoring system and a monitoring method

Technical Field

The present invention relates to the field of vehicle technology, and in particular to a monitoring system and a monitoring method.

Background Art

The existing monitoring system for monitoring wheel alignment is usually set outside the vehicle and cannot monitor wheel alignment during the vehicle's driving process. The existing monitoring system includes a three-dimensional sensor, which collects the position information of the wheel center to calculate the wheel alignment information and then judge whether the wheel alignment is qualified. However, the existing monitoring system structure and calculation process are relatively complex and cannot detect wheel alignment problems in a timely manner.

Summary of the invention

A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

In order to at least partially solve the above problem, according to a first aspect of the present invention, a monitoring system is provided, the monitoring system comprising:

A monitoring device, the monitoring device is used to be fixed to the tire to monitor the pressure of the tire and generate a monitoring signal;

A control device, wherein the control device is wirelessly connected to the monitoring device, the control device is used to receive the monitoring signal sent by the monitoring device, and can convert the monitoring signal into an actual tire footprint image, at least one preset footprint image is stored in the control device, and the control device compares the actual footprint image with the at least one preset footprint image to determine whether the wheel alignment is qualified.

According to the monitoring system of the present invention, the monitoring system includes a monitoring device and a control device, the monitoring device is used to be fixed to the tire to monitor the pressure of the tire and generate a monitoring signal, the control device is wirelessly connected to the monitoring device, the control device is used to receive the monitoring signal sent by the monitoring device, and can convert the monitoring signal into an actual imprint image of the tire, the control device stores at least one preset imprint image, and the control device compares the actual imprint image with at least one preset imprint image to determine whether the wheel alignment is qualified. In this way, the monitoring device can generate a monitoring signal according to the pressure of the tire, the control device can convert the monitoring signal into an actual imprint image of the tire, and the control system can compare the actual imprint image with at least one preset imprint image, and can timely determine whether the wheel alignment is qualified, and the monitoring system can timely monitor the actual situation of the tire, so as to make a timely judgment.

Optionally, the monitoring device comprises a signal transmitting device and a piezoelectric sensor, wherein the signal transmitting device is electrically connected to the piezoelectric sensor, and the signal transmitting device is wirelessly connected to the control device, thereby enabling the monitoring signal to be accurately transmitted to the control device.

Optionally, the piezoelectric sensor is used to monitor the pressure of the tire and generate a voltage signal, and the signal transmitting device receives the voltage signal and converts the voltage signal into a pulse signal, thereby accurately monitoring the pressure of the tire and generating a voltage signal.

Optionally, the control device receives the pulse signal emitted by the signal emitting device and converts the pulse signal into an image signal, thereby facilitating visualization.

Optionally, the control device generates the actual print image according to the plurality of image signals, thereby facilitating visualization.

Optionally, the monitoring device comprises a plurality of the piezoelectric sensors, and the plurality of piezoelectric sensors are arranged at intervals along the width direction of the tire, thereby improving the monitoring accuracy.

Optionally, the monitoring device is embedded in the tire, the tire has at least one tread pattern, the actual impression image includes at least one actual pattern image, and the tread pattern is arranged corresponding to at least one piezoelectric sensor, thereby improving the accuracy of monitoring.

Optionally, the control device generates an actual pattern image of the tread pattern according to a voltage signal sent by the piezoelectric sensor, thereby facilitating obtaining an actual pattern image of the tread pattern.

Optionally, the control device generates an actual pattern image of the tread pattern according to voltage signals emitted by a plurality of the piezoelectric sensors, thereby improving the monitoring accuracy.

Optionally, when the actual imprint image is identical to one of the at least one preset imprint image, the wheel alignment is determined to be qualified; when the actual imprint image is different from both of the at least one preset imprint image, the wheel alignment is determined to be unqualified.

Optionally, the control device comprises:

A signal receiving device, the signal receiving device is wirelessly connected to the monitoring device to receive the monitoring signal;

a memory storing the at least one preset imprint image; and

A processor converts the monitoring signal into the actual imprint image, and compares the actual imprint image with the preset imprint image to determine whether the wheel alignment is qualified.

The present invention also provides a monitoring method using the above monitoring system, the monitoring method comprising:

The monitoring device monitors the pressure of the tire and generates a monitoring signal;

The monitoring device transmits the monitoring signal to the control device, and the control device converts the monitoring signal into an actual footprint image of the tire;

The control device compares the actual impression image with the at least one preset impression image to determine whether the wheel alignment is qualified.

According to the monitoring method of the present invention, the monitoring method includes a monitoring device monitoring the pressure exerted on the tire and generating a monitoring signal; the monitoring device transmits the monitoring signal to the control device, and the control device converts the monitoring signal into an actual imprint image of the tire; the control device compares the actual imprint image with at least one preset imprint image to determine whether the wheel alignment is qualified. In this way, the monitoring device can generate a monitoring signal according to the pressure exerted on the tire, the control device can convert the monitoring signal into an actual imprint image of the tire, and the control system can compare the actual imprint image with at least one preset imprint image, and can timely determine whether the wheel alignment is qualified, and the monitoring system can timely monitor the actual situation of the tire, so as to make a timely judgment.

Optionally, when the actual imprint image is identical to one of the at least one preset imprint image, the wheel alignment is determined to be qualified; when the actual imprint image is different from both of the at least one preset imprint image, the wheel alignment is determined to be unqualified.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the device and principle of the present invention. In the drawings,

FIG1 is a side view of a monitoring device of a monitoring system according to a preferred embodiment of the present invention fixed to a tire;

FIG2 is a schematic diagram of the end portion of the tire shown in FIG1 , wherein the middle portion of the tire is omitted;

FIG3 is a plan view of the tire and vehicle body shown in FIG1;

FIG4 is a schematic diagram of the monitoring device shown in FIG1 being located at different positions;

FIG5 is a structural diagram of the monitoring device shown in FIG1 ;

FIG6 is a force-voltage response curve diagram of the piezoelectric sensor shown in FIG5 ;

FIG7 is a schematic diagram of the connection between the piezoelectric sensor and the signal transmitting device shown in FIG5 ;

Figure 8a is a tire footprint image when the wheel camber angle is 0°;

Figure 8b is the tire footprint image when the wheel camber angle is -2°;

FIG. 9 is a flow chart of a monitoring method according to an embodiment of the present invention.

Description of reference numerals:

1: Tire 2: Monitoring device

3: Body 4: Control device

5: Signal transmitter 6: Piezoelectric sensor

7: Tread pattern 8: Voltage amplifier

DETAILED DESCRIPTION

In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

In order to fully understand the present invention, a detailed structure will be presented in the following description to illustrate the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments and should not be construed as being limited to the embodiments presented here.

It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention, and the singular forms "one", "an" and "said/the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and/or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and/or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and/or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present invention and do not limit the present invention.

Sometimes a vehicle may be slightly bumped during driving, which may cause inaccurate wheel alignment of the vehicle, such as slight deformation of the chassis caused by bumps, but it is difficult for the driver to detect this during driving. Therefore, the present invention provides a monitoring system for monitoring whether the wheel alignment of the vehicle is qualified, so as to help the driver make a timely judgment. In particular, the monitoring system provided by the present invention can be applied to a normally driving vehicle to provide real-time feedback on the status of the wheel.

As shown in Figures 1 to 3, the monitoring system includes a monitoring device 2 and a control device 4. The monitoring device 2 is used to be fixed to the tire 1, and the monitoring device 2 is also wirelessly connected to the control device 4. The monitoring device 2 can rotate and roll together with the tire 1. The monitoring device 2 can be fixed to a specific area of the tire 1 and arranged close to the outer peripheral surface of the tire 1 to monitor the pressure exerted by the ground on the tire 1. The length direction of the monitoring device 2 can be roughly parallel to the width direction of the tire 1, and the width direction of the monitoring device 2 can be roughly parallel to the radial direction of the tire 1.

When a specific area of the tire 1 contacts the ground, the ground applies pressure to the tire 1 to deform the outer surface of the tire 1 . The monitoring device 2 of the specific area can generate a monitoring signal according to the pressure applied to the tire 1 .

The monitoring device 2 can wirelessly send the generated monitoring signal to the control device 4. The control device 4 does not move with the movement of the tire 1. Optionally, the control device 4 can be set to the body 3 of the vehicle. The monitoring device 2 can send the monitoring signal to the control device 4 by wireless data transmission. The control device 4 receives the monitoring signal sent by the monitoring device 2 and can convert the monitoring signal into an actual footprint image of the tire 1. Thus, the monitoring system can obtain the footprint image of the tire 1 during actual driving.

At least one preset footprint image is also stored in the control device 4. The at least one preset footprint image can constitute a qualified footprint database. The preset footprint image can be a preset tire footprint image of a vehicle with qualified wheel alignment traveling on various road surfaces.

For example, as shown in FIG8a, assuming that the camber angle of the qualified wheel of the vehicle is 0°, the tire footprint image of the unloaded vehicle when driving on a normal road is the first preset footprint image, of course, the tire footprint image of the half-loaded vehicle when driving on a normal road is the second preset footprint image (not shown), and the tire footprint image of the fully loaded vehicle when driving on a normal road is the third preset footprint image (not shown). The first preset footprint image, the second preset footprint image, and the third preset footprint image are all stored in the control device 4. Of course, the camber angle of the qualified wheel of the vehicle can also be other angles, and the driving conditions of the vehicle are not limited to the above three. For example, the tire footprint image can be preset according to the actual situation for 90° steering and U-turn conditions.

The control device 4 compares the actual imprint image with at least one preset image to determine whether the wheel alignment is qualified. As shown in Figure 8b, it is assumed that the actual camber angle of the wheel is -2°, which is an unqualified angle. During the actual driving of an unloaded vehicle, the monitoring system monitors the pressure exerted on the tire 1 and generates a monitoring signal. The control device 4 generates an actual imprint image of the tire 1 based on the monitoring signal. The control device 4 compares the actual imprint image with the first preset imprint image, the second preset imprint image and the third preset imprint image to determine whether the wheel alignment is qualified.

When the actual imprint image is different from the first preset imprint image, the second preset imprint image and the third preset imprint image, the control device 4 determines that the wheel alignment is unqualified. When the actual imprint image is the same as one of the actual imprint image and the first preset imprint image, the second preset imprint image and the third preset imprint image, the control device 4 determines that the wheel alignment is qualified. Of course, the actual imprint image generated when a half-loaded or fully loaded vehicle is actually driving on a normal road can also be compared with the above method to determine whether the wheel alignment is qualified, and then determine whether the vehicle has a fault.

Similarly, assuming that the camber angle of the qualified wheel of the vehicle is -2°, the tire footprint image of the vehicle with a qualified wheel camber angle (-2°) when driving on a normal road in the conditions of no load, full load and half load is the preset footprint image. Assuming that the actual camber angle of the vehicle's wheel is 0°, 0° is an unqualified angle. Then similar to the above process, the control device 4 compares the actual footprint image of the tire with the preset footprint image to determine whether the wheel alignment is qualified, which will not be repeated here. The camber angle of the qualified wheel of the vehicle is not limited to the above two camber angles, and the tire footprint images when the camber angle is 0° and -2° can also be qualified preset footprint images. The control device compares the actual footprint image of the vehicle during actual driving with the qualified preset footprint images of multiple qualified camber angles. It can be understood that the preset footprint images stored in the control device can be a large number of images, which cover as many vehicle conditions and driving conditions as possible.

Of course, the monitoring system can also be applied to a dedicated monitoring mechanism for four-wheel alignment of a vehicle. For example, the monitoring system of the present invention can also be applied to a monitoring workshop in a factory or a 4S store. The tire 1 of the vehicle rolls on the platform in the dedicated monitoring mechanism, the monitoring device 2 monitors the pressure exerted on the tire 1 and generates a monitoring signal, and the control device 4 can convert the monitoring signal into an actual impression image of the tire 1. And the control device 4 compares the actual impression image with at least one preset impression image to determine whether the wheel alignment is qualified. In this way, the complexity of the structure of the dedicated monitoring mechanism can be reduced, the accuracy of the dedicated monitoring mechanism can be reduced, and the efficiency can be improved.

According to the monitoring system of the present invention, the monitoring system includes a monitoring device and a control device, the monitoring device is used to be fixed to the tire to monitor the pressure of the tire and generate a monitoring signal, the control device is wirelessly connected to the monitoring device, the control device is used to receive the monitoring signal sent by the monitoring device, and can convert the monitoring signal into an actual imprint image of the tire, the control device stores at least one preset imprint image, and the control device compares the actual imprint image with at least one preset imprint image to determine whether the wheel alignment is qualified. In this way, the monitoring device can generate a monitoring signal according to the pressure of the tire, the control device can convert the monitoring signal into an actual imprint image of the tire, and the control system can compare the actual imprint image with at least one preset imprint image, and can timely determine whether the wheel alignment is qualified, and the monitoring system can timely monitor the actual situation of the tire, so as to make a timely judgment.

The specific structure of the monitoring device 2 is shown in FIG5 . The monitoring device 2 includes a signal transmitting device 5 and a piezoelectric sensor 6. The signal transmitting device 5 and the piezoelectric sensor 6 are both fixed to the tire 1. Optionally, in order to ensure the monitoring accuracy of the monitoring device 2 and the tire 1, the monitoring device 2 can be embedded in the tire 1. The signal transmitting device 5 and the piezoelectric sensor 6 can roll synchronously with the rolling of the tire 1. The signal transmitting device 5 and the piezoelectric sensor 6 can be produced together with the tire 1. For example, during the production process of the tire 1, the signal transmitting device 5 and the piezoelectric sensor 6 can be placed in the tire 1 during the molding process of the tire 1 production, so as to be integrally molded with the tire 1, and it can be ensured that the arrangement direction of the piezoelectric sensor 6 is approximately perpendicular to the forward direction of the tire 1 during the rolling process.

The signal transmitting device 5 is electrically connected to the piezoelectric sensor 6. The signal transmitting device 5 can be electrically connected to the piezoelectric sensor 6 by means of wires or the like. Thus, the piezoelectric sensor 6 can transmit a signal to the signal transmitting device 5, and the signal transmitting device 5 can stably receive the signal emitted by the piezoelectric sensor 6 and process the signal transmitted by the piezoelectric sensor 6. The signal transmitting device 5 is wirelessly connected to the control device 4, and the signal transmitting device 5 can send the processed signal to the control device 4 by means of wireless data transmission.

Furthermore, the piezoelectric sensor 6 is used to monitor the pressure of the tire 1 and generate a voltage signal. The piezoelectric sensor 6 can be embedded in the tire 1. In order to ensure the accuracy of the monitoring of the piezoelectric sensor 6, the piezoelectric sensor 6 is arranged at the tread base of the tire 1. That is, the piezoelectric sensor 6 can be arranged at the tread base of the tire 1. The signal transmitter 5 can also be embedded in the tire 1.

In an optional embodiment, the signal transmitting device 5 can be arranged together with the piezoelectric sensor 6, for example, the signal transmitting device 5 and the piezoelectric sensor 6 are located on the same circuit board, and the signal transmitting device 5 and the piezoelectric sensor 6 can be arranged together at the tread base of the tire 1. The piezoelectric sensor 6 is located behind the signal transmitting device 5 along the forward direction of the tire 1. Since the tire 1 rolls around the circumferential direction of the tire 1, the piezoelectric sensor 6 is subjected to the pressure applied by the ground before the signal transmitting device 5.

In another optional embodiment, the signal transmitting device 5 and the piezoelectric sensor 6 may not be located on the same circuit board, and the signal transmitting device 5 may not be arranged at the tread base of the tire 1, so as to avoid the signal transmitting device 5 processing the signal affecting the monitoring accuracy of the piezoelectric sensor 6. For example, the signal transmitting device 5 may be arranged in the carcass of the tire 1.

The piezoelectric sensor 6 monitors the pressure on the tire 1 and generates a voltage signal. The piezoelectric sensor 6 may be a piezoelectric diaphragm sensor or other light and soft piezoelectric elements. The piezoelectric sensor 6 may be a passive element. The length direction of the piezoelectric sensor 6 may be substantially parallel to the forward direction of the tire 1, and the width direction of the piezoelectric sensor 6 may be substantially parallel to the width direction of the tire 1. Thus, the pressure on the tire 1 can be accurately monitored.

Optionally, the piezoelectric sensor 6 can be deformed after being subjected to pressure. When the tire 1 is rolling, the ground will exert pressure on the tire 1, and the tire 1 will be deformed by the pressure. The pressure exerted on the tire 1 will be transmitted to the piezoelectric sensor 6, and the piezoelectric sensor 6 can be deformed by the pressure. After the piezoelectric sensor 6 is deformed by the pressure, the two surfaces of the piezoelectric sensor 6 along the thickness direction of the piezoelectric sensor 6 respectively generate bound charges of opposite signs, and the bound charges are proportional to the pressure exerted on the tire 1. The piezoelectric sensor 6 is in a charged state, generates electricity, and then forms a voltage. The piezoelectric sensor 6 of this embodiment is relatively thin, has no side electrodes, and has little lateral charge, so the generated lateral voltage can also be ignored.

The tire 1 continues to roll, and after the area of the tire 1 with the piezoelectric sensor 6 leaves the ground, the ground no longer applies pressure to the area of the tire 1 with the piezoelectric sensor 6, and the piezoelectric sensor 6 is not affected by the pressure and will no longer deform and will recover. When the pressure disappears, the piezoelectric sensor 6 is in a non-charged state and no longer generates electricity, so no voltage is generated. That is, if the tire 1 does not touch the ground, the piezoelectric sensor 6 is not affected by pressure, and the piezoelectric sensor 6 does not generate a voltage signal, and the control device 4 does not generate an actual imprint image.

Preferably, the monitoring device 2 may include a plurality of piezoelectric sensors 6, and the plurality of piezoelectric sensors 6 may be arranged at intervals along the width direction of the tire 1, thereby ensuring that the monitoring signal can monitor the pressure value of the tire 1 along the width direction of the tire 1, and avoiding omission of the monitoring signal. The plurality of piezoelectric sensors 6 may be arranged at intervals along the width direction of the piezoelectric sensors 6. The plurality of piezoelectric sensors 6 are all electrically connected to the signal transmitting device 5, and the plurality of piezoelectric sensors 6 are all able to monitor the pressure of different positions of the tire 1 along the width direction of the tire 1 and generate corresponding voltage signals.

The multiple piezoelectric sensors 6 along the width direction of the tire 1 need to cover the tread width of the tire 1. The two piezoelectric sensors at the farthest ends along the width direction of the tire 1 among the multiple piezoelectric sensors can respectively correspond to the outermost edges of the tire 1 along the width direction of the tire 1. The distance between the two piezoelectric sensors at the farthest ends along the width direction of the tire 1 among the multiple piezoelectric sensors can be roughly the same as the width of the tire 1. In this way, it can be ensured that the pressure of the tire 1 along the width direction of the tire 1 is captured as much as possible by the piezoelectric sensors 6, avoiding the pressure on the tire 1 from being missed. The number of piezoelectric sensors 6 matches the tread width of the tire 1. The larger the width of the tire 1, the more piezoelectric sensors 6 need to be arranged.

Further, as shown in FIG. 2 , the tire 1 has at least one tread pattern 7, and the tread pattern 7 is arranged corresponding to at least one piezoelectric sensor 6 to ensure that the actual contact footprint of the tire 1 is complete and accurate. The tire 1 may have a plurality of tread patterns 7 along the width direction of the tire 1, and the tread pattern 7 can directly contact the ground to receive the pressure applied by the ground to the tread pattern 7. Each tread pattern 7 corresponds to at least one piezoelectric sensor 6. The piezoelectric sensor 6 can be embedded in the tread pattern 7. In this way, the pressure received by each tread pattern 7 can be monitored by the piezoelectric sensor 6 to ensure the accuracy of the data.

One tread pattern 7 may correspond to multiple piezoelectric sensors 6, and the multiple piezoelectric sensors 6 may be embedded in the tread base corresponding to the rubber of the same tread pattern 7. The multiple piezoelectric sensors 6 may monitor the stress conditions of the same tread pattern 7 at different positions along the width direction of the tire 1, so that multiple voltage signals may feed back the stress conditions of different positions of the same tread pattern 7 to improve accuracy.

For example, one tread pattern 7 may correspond to three piezoelectric sensors 6, and three tread patterns 7 may correspond to nine piezoelectric sensors 6. Of course, the number of tread patterns 7 of the tire 1 may be different, and the number of piezoelectric sensors 6 corresponding to each tread pattern 7 may also be different from each other. For example, one tread pattern 7 may correspond to one piezoelectric sensor 6, another tread pattern 7 may correspond to three piezoelectric sensors 6, and another tread pattern 7 may correspond to five piezoelectric sensors 6, and this embodiment is not intended to limit this.

The piezoelectric equation for a piezoelectric sensor 6 is usually:

In the above formula, Di (i = x, y, z) represents the electric displacement in the i direction, dij is the piezoelectric constant, is the material property, σij is the stress received on the i axis, and τij is the shear force acting in the ij plane. The piezoelectric equation is simplified to:

D _z =d ₃₁ σ _xx +d ₃₂ σ _yy +d ₃₃ σ _zz

Therefore, under the action of static force, as shown in FIG6 , the voltage output by the piezoelectric sensor 6 is in a linear relationship with the external force.

Now returning to FIG. 5 , the signal transmitting device 5 is electrically connected to the piezoelectric sensor 6, and the signal transmitting device 5 can receive the voltage signal of the piezoelectric sensor 6 and convert the voltage signal into a pulse signal. Optionally, as shown in FIG. 7 , a voltage amplifier 8 can be provided between the piezoelectric sensor 6 and the signal transmitting device 5 to amplify the voltage generated by the piezoelectric sensor 6 when it is subjected to force, thereby ensuring the accuracy of the pulse signal.

The control device 4 receives the pulse signal emitted by the signal transmitting device 5 and converts the pulse signal into an image signal. The pressure on the piezoelectric sensor 6 along the forward direction of the vehicle is changing, so the voltage signal emitted by the piezoelectric sensor 6 is changing, so that the signal transmitting device 5 continues to send different pulse signals to the control device 4. As shown in FIG8b, the control device 4 converts different pulse signals into image signals, and then feeds back the actual image information of the tire 1 along the forward direction of the tire 1. The signal transmitting device sends an electromagnetic wave (i.e., a pulse signal) containing the voltage signal generated by the piezoelectric sensor to the control device, and the control device receives the electromagnetic wave for demodulation, and finally generates an image signal after conversion by the control device. The control device 4 generates an actual imprint image based on multiple image signals. The control device 4 generates an actual imprint image based on different actual image information. The image signal can be sent to the ECU via CAN or other communication methods, and the actual imprint image can be displayed on the vehicle display, or sent to a remote data center via the Internet of Vehicles for display.

The pressure on the piezoelectric sensor 6 changes when the tire 1 rolls. The piezoelectric sensor 6 is subjected to different pressures along the forward direction of the tire 1 and produces different deformations. The piezoelectric sensor 6 is subjected to different pressures at different positions along the length direction of the piezoelectric sensor 6. The piezoelectric sensor 6 can produce different deformations when the tire 1 rolls once. That is, the piezoelectric sensor 6 can produce different voltage signals when the tire 1 rolls once.

As shown in FIG4 , the piezoelectric sensor 6 completes the process of pre-grounding, grounding and leaving the ground along with the tire 1, and the control device 4 converts this process into an actual footprint image of the tire 1. After the piezoelectric sensor 6 leaves the ground, the piezoelectric sensor 6 is deformed and disappears, and no signal is generated until the next grounding deformation.

For example, when the tire 1 rolls once, the pressure on the piezoelectric sensor changes. The piezoelectric sensor can be continuously subjected to different pressures and produce continuous deformation. The voltage signal emitted by the piezoelectric sensor can also be continuous. The piezoelectric sensor sends a continuous voltage signal to the signal transmitter, and the signal transmitter can convert the continuous voltage signal into a pulse signal. The signal transmitter can set a time interval, does not store historical information, and only sends the current pressure status.

Take the tires used in common B-class cars as an example. The rolling radius of the tire is 0.32m. The vehicle travels on the road at 80km/h. It can be obtained that the tire takes 90ms to roll a circle. Assuming that the tire ground contact length is 0.2m, the piezoelectric sensor action time is 9ms. The signal transmitter is set to start working after receiving the voltage signal (without considering the reaction time), and transmit once every 1ms, so that a rolling cycle transmits 9 pulse signals. It can be obtained that the shorter the set interval time, the higher the accuracy. The signal transmitter transmits multiple pulse signals to the control device, and the control device generates different image signals according to the multiple pulse signals.

The control device 4 generates an actual footprint image of the tire 1 according to different image signals, and the actual footprint image of the tire 1 can be drawn along the forward direction of the vehicle. For example, as shown in FIG8a and FIG8b, the control device 4 forms a long strip of tire 1 footprint extending along the forward direction of the vehicle according to different image signals. The control device 4 draws tire 1 footprints of different colors according to the information fed back by different image signals, so as to be able to feed back the actual situation of the tire 1.

The multiple piezoelectric sensors 6 can respectively send voltage signals to the signal transmitting device 5, and the multiple piezoelectric sensors 6 are independent of each other. Optionally, the signal transmitting device 5 has multiple feelers, and different feelers can be electrically connected to different piezoelectric sensors 6. The signal transmitting device 5 receives multiple voltage signals and converts the multiple voltage signals into multiple pulse signals, and then sends the multiple pulse signals to the control device 4. The control device 4 generates different image signals according to different pulse signals, and then generates different actual impression images.

The process in which the signal transmitting device 5 receives the voltage signal emitted by each of the plurality of piezoelectric sensors 6 and converts it into a pulse signal, and then sends it to the control device is similar to the above, and will not be repeated here.

Further, as shown in FIG8b, the actual impression image may include at least one actual pattern impression, and the actual pattern impression corresponds to the tread pattern 7. The at least one actual pattern impression may be arranged along the width direction of the tire 1. The monitoring system can monitor the pressure exerted on the tread pattern 7 and can generate the actual pattern impression of the tread pattern 7.

In an optional embodiment, one tread pattern 7 corresponds to one piezoelectric sensor 6. When one tread pattern 7 contacts the ground, the ground applies pressure to the tread pattern 7. One piezoelectric sensor 6 is deformed by the pressure, and the pressure on the piezoelectric sensor 6 is continuous and variable. The piezoelectric sensor 6 senses the magnitude of the pressure and is deformed by the pressure. If the tread pattern 7 does not contact the ground, the piezoelectric sensor 6 is not subjected to pressure, and the piezoelectric sensor 6 does not generate a voltage signal, and the control device 4 does not generate an actual pattern image.

If the pressure value received by the above-mentioned one piezoelectric sensor 6 remains unchanged, the piezoelectric sensor 6 continues to send a voltage signal with the same voltage value. The above-mentioned one piezoelectric sensor 6 sends the voltage signal with the same voltage value to the signal transmitting device 5, and the signal transmitting device 5 converts the voltage signal into the same pulse signal, and then sends the pulse signal to the control device 4. The control device 4 generates a corresponding image signal according to the pulse signal, and then draws the actual pattern image of the tread pattern 7. In this way, the actual pattern image of the tread pattern 7 extends along the forward direction of the vehicle and the color of the image remains consistent.

If the pressure value received by the above-mentioned one piezoelectric sensor 6 changes, the above-mentioned one piezoelectric sensor 6 continuously sends voltage signals of different voltage values. The above-mentioned one piezoelectric sensor 6 sends voltage signals of different voltage values to the signal transmitting device 5, and the signal transmitting device 5 converts different voltage signals into different pulse signals respectively, and then sends different pulse signals to the control device 4. The control device 4 can generate different image signals according to different pulse signals respectively, and then draw the actual pattern image of the tread pattern 7. In this way, the actual pattern image of the tread pattern 7 extends along the forward direction of the vehicle and the color of the image changes.

In another optional embodiment, one tread pattern 7 corresponds to multiple piezoelectric sensors 6, and the multiple piezoelectric sensors 6 are arranged at intervals along the width direction of the tire 1 to jointly form an actual pattern image of the tread pattern 7, thereby improving the accuracy of monitoring. When a tread pattern 7 contacts the ground, the ground applies pressure to the tread pattern 7. The multiple piezoelectric sensors 6 are deformed by the pressure, and the pressure on the multiple piezoelectric sensors 6 is continuous and variable. The multiple piezoelectric sensors 6 can sense the magnitude of the pressure and produce deformation. If the tread pattern 7 does not contact the ground, the multiple piezoelectric sensors 6 are not subjected to pressure, then the multiple piezoelectric sensors 6 do not generate voltage signals, and the control device 4 does not generate an actual pattern image. The process of each of the multiple piezoelectric sensors 6 generating a voltage signal is similar to the case where a piezoelectric sensor 6 generates a voltage signal as described above. Different image signals are generated according to the different pressures on different positions of the tire 1 to draw different actual pattern images, which will not be repeated here.

The control device 4 compares the actual imprint image with at least one preset imprint image stored in the control device 4 to determine whether the wheel alignment is qualified. In this way, it is possible to quickly and accurately determine whether the wheel alignment is qualified. The actual imprint image and the preset imprint image can compare the outer contour, inner contour points and internal offset between the images to determine whether the wheel alignment is qualified. As described above, the control device 4 can store one or more preset imprint images, and the actual imprint image is compared with the one or more preset imprint images.

Optionally, the control device 4 includes a signal receiving device, a memory and a processor, and the signal receiving device is wirelessly connected to the monitoring device 2 to receive the monitoring signal. Preferably, the signal receiving device can be set to the vehicle body 3, and the signal receiving device can be wirelessly connected to the signal transmitting device 5 to receive the pulse signal, and can convert the pulse signal into an image signal. The signal receiving device can be connected to the processor by a data connection, and the image signal of the signal receiving device can be transmitted to the processor, and the processor converts the monitoring signal into an actual imprint image.

The processor can be provided to the vehicle body 3 and connected to the signal receiving device by wired connection. The processor can also be remotely connected to the signal receiving device by wireless connection. The processor receives the image signal sent by the signal receiving device and can generate the actual impression image according to the multiple image signals.

The control device 4 converts different pulse signals into image signals, and then feeds back the actual image information of the tire 1 along the forward direction of the tire 1. The signal transmitting device sends an electromagnetic wave (i.e., a pulse signal) containing a voltage signal generated by the piezoelectric sensor to the control device, and the control device receives the electromagnetic wave for demodulation. After conversion by the control device, an image signal is finally generated. The control device 4 generates an actual imprint image based on multiple image signals. The control device 4 generates an actual imprint image based on a combination of different actual image information. The image signal can be sent to the ECU via CAN or other communication methods, and the actual imprint image can be displayed on the vehicle display, or sent to a remote data center for display via the Internet of Vehicles.

The memory stores at least one preset imprint image, and the memory can be electrically connected to the processor. Both the memory and the processor can be integrated into the vehicle body 3, or can be remotely connected to the vehicle body 3. The processor can also compare the actual imprint image with the preset imprint image to determine whether the wheel alignment is qualified.

When the actual imprint image is identical to one of the at least one preset imprint image, the wheel alignment is determined to be qualified. That is, when the outer contour, inner contour points and inner offset of the actual imprint image are all identical to the outer contour, inner contour points and inner offset of one of the at least one preset imprint image, the wheel alignment is determined to be qualified.

When the actual imprint image is different from at least one preset imprint image, the wheel alignment is determined to be unqualified. That is, when the outer contour, inner contour point and inner offset of the actual imprint image are different from the outer contour, inner contour point and inner offset of each of at least one preset imprint image, the wheel alignment is determined to be unqualified.

In this way, when the tire 1 touches the ground at different wheel camber angles, contact marks with different symmetry will appear. When the wheel camber angle is abnormal, the contact angle of the tire 1 is abnormal, which will cause abnormal wear of the tire 1 such as eccentric wear, thereby reducing the service life of the tire 1. Therefore, the present invention provides a monitoring system, which collects the deformation of the tread through a piezoelectric sensor 6 built into the tread, simulates the current contact mark of the tire 1, and determines whether the current wheel alignment is qualified by comparing the preset preset mark image data, and then determines whether the four-wheel alignment of the vehicle meets the requirements, thereby issuing an alarm message in time.

As shown in FIG9 , the present invention further provides a monitoring method using the above monitoring system, the monitoring method comprising:

The monitoring device monitors the pressure of the tire and generates a monitoring signal.

The monitoring device 2 includes a signal transmitting device 5 and a piezoelectric sensor 6, and the signal transmitting device 5 is electrically connected to the piezoelectric sensor 6. The piezoelectric sensor 6 can transmit a signal to the signal transmitting device 5, and the signal transmitting device 5 can stably receive the signal emitted by the piezoelectric sensor 6 and process the signal transmitted by the piezoelectric sensor 6.

The piezoelectric sensor 6 is used to monitor the pressure on the tire 1 and generate a voltage signal. The piezoelectric sensor 6 can be embedded in the tire 1. The piezoelectric sensor 6 can be a piezoelectric diaphragm sensor or other lightweight and soft piezoelectric elements. The piezoelectric sensor 6 can be a passive element. Optionally, the piezoelectric sensor 6 can be deformed when it is under pressure. When the tire 1 is rolling, the ground will exert pressure on the tire 1, and the tire 1 will be deformed by the pressure. The pressure on the tire 1 will be transmitted to the piezoelectric sensor 6, and the piezoelectric sensor 6 can be deformed by the pressure, thereby generating a voltage.

The tire 1 continues to roll, and after the area of the tire 1 with the piezoelectric sensor 6 leaves the ground, the ground no longer applies pressure to the area of the tire 1 with the piezoelectric sensor 6, and the piezoelectric sensor 6 is not affected by the pressure and will no longer deform and will recover. When the pressure disappears, the piezoelectric sensor 6 does not generate a voltage signal.

Preferably, the monitoring device 2 may include a plurality of piezoelectric sensors 6, and the plurality of piezoelectric sensors 6 may be arranged at intervals along the width direction of the tire 1. The plurality of piezoelectric sensors 6 are capable of monitoring the pressure of the tire 1 at different positions along the width direction of the tire 1 and generating corresponding voltage signals, thereby ensuring that the monitoring signal can monitor the pressure value of the tire 1 along the width direction of the tire 1, and avoiding omission of the monitoring signal.

The signal transmitter 5 is electrically connected to the piezoelectric sensor 6, and the signal transmitter 5 can receive the voltage signal of the piezoelectric sensor 6 and convert the voltage signal into a pulse signal. The monitoring signal includes the above-mentioned voltage signal and pulse signal.

The monitoring device transmits the monitoring signal to the control device, and the control device converts the monitoring signal into an actual footprint image of the tire.

The signal transmitting device 5 can also be wirelessly connected to the control device 4, and the signal transmitting device 5 can send the processed signal to the control device 4 by wireless data transmission, thereby improving the accuracy of the monitoring data of the monitoring device 2.

The control device 4 receives the pulse signal sent by the signal transmitting device 5, and converts the pulse signal into an image signal. The pressure on the piezoelectric sensor 6 along the forward direction of the vehicle is changing, so the voltage signal sent by the piezoelectric sensor 6 is changing, so that the signal transmitting device 5 continues to send different pulse signals to the control device 4. The control device 4 converts different pulse signals into image signals, and then feeds back the actual image information of the tire 1 along the forward direction of the tire 1. The control device 4 generates an actual imprint image based on multiple image signals. The control device 4 generates an actual imprint image based on different actual image information.

The control device compares the actual impression image with at least one preset impression image to determine whether the wheel alignment is qualified.

For example, as shown in FIG8a, assuming that the camber angle of the qualified wheel of the vehicle is 0°, the tire footprint image of an unloaded vehicle when driving on a normal road is the first preset footprint image, of course, the tire footprint image of a half-loaded vehicle when driving on a normal road is the second preset footprint image (not shown), and the tire footprint image of a fully loaded vehicle when driving on a normal road is the third preset footprint image (not shown). The first preset footprint image, the second preset footprint image, and the third preset footprint image are stored in the control device 4.

As shown in FIG8b, it is assumed that the actual camber angle of the wheel is -2°, which is an unqualified angle. During the actual driving process of an unloaded vehicle, the monitoring system monitors the pressure exerted on the tire 1 and generates a monitoring signal. The control device 4 generates an actual imprint image of the tire 1 according to the monitoring signal. The actual imprint image is compared with the first preset imprint image, the second preset imprint image and the third preset imprint image to determine whether the wheel alignment is qualified. When the actual imprint image is different from the first preset imprint image, the second preset imprint image and the third preset imprint image, the control device 4 determines that the wheel alignment is unqualified. When the actual imprint image is the same as the actual imprint image and one of the first preset imprint image, the second preset imprint image and the third preset imprint image, the control device 4 determines that the wheel alignment is qualified. Of course, the actual imprint image generated by a half-loaded or fully loaded vehicle when it is actually driving on a normal road can also be compared with the above method to determine whether the wheel alignment is qualified, and then determine whether the vehicle has a fault.

According to the monitoring method provided by the present invention, the monitoring method includes a monitoring device monitoring the pressure exerted on the tire and generating a monitoring signal; the monitoring device transmits the monitoring signal to the control device, and the control device converts the monitoring signal into an actual imprint image of the tire; the control device compares the actual imprint image with at least one preset imprint image to determine whether the wheel alignment is qualified. In this way, the monitoring device can generate a monitoring signal according to the pressure exerted on the tire, the control device can convert the monitoring signal into an actual imprint image of the tire, and the control system can compare the actual imprint image with at least one preset imprint image, and can timely determine whether the wheel alignment is qualified, and the monitoring system can timely monitor the actual situation of the tire, so as to make a timely judgment.

The control device 4 compares the actual imprint image with at least one preset imprint image stored in the control device 4 to determine whether the wheel alignment is qualified. In this way, it is possible to quickly and accurately determine whether the wheel alignment is qualified. The actual imprint image and the preset imprint image can compare the outer contour, inner contour points and internal offset between the images to determine whether the wheel alignment is qualified. As described above, the control device 4 can store one or more preset imprint images, and the actual imprint image is compared with the one or more preset imprint images.

Optionally, the monitoring method further comprises:

When the actual imprint image is identical to one of the at least one preset imprint image, the wheel alignment is determined to be qualified.

Thus, when the outer contour, inner contour points and inner offset of the actual imprint image are the same as those of one of the at least one preset imprint image, the wheel alignment is determined to be qualified. The vehicle can run normally.

When the actual imprint image is different from at least one preset imprint image, it is determined that the wheel alignment is unqualified.

Thus, when the outer contour, inner contour points and inner offset of the actual imprint image are different from the outer contour, inner contour points and inner offset of each of at least one preset imprint image, the wheel alignment is determined to be unqualified. The vehicle issues an alarm message.

Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "parts" and "components" appearing herein may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing herein may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims (13)

1. A monitoring system, the monitoring system comprising:

Monitoring means for being secured to a tyre to monitor the pressure to which the tyre is subjected and to generate a monitoring signal;

The control device is in wireless connection with the monitoring device, the control device is used for receiving the monitoring signal sent by the monitoring device, the monitoring signal can be converted into an actual impression image of the tire, at least one preset impression image is stored in the control device, and the control device compares the actual impression image with the at least one preset impression image to judge whether the wheel positioning is qualified or not.

2. The monitoring system of claim 1, wherein the monitoring device comprises a signal emitting device and a piezoelectric sensor, the signal emitting device being electrically connected to the piezoelectric sensor, the signal emitting device being wirelessly connected to the control device.

3. The monitoring system of claim 2, wherein the piezoelectric sensor is configured to monitor a pressure experienced by the tire and generate a voltage signal, and the signal transmitting device receives the voltage signal and converts the voltage signal into a pulse signal.

4. A monitoring system according to claim 3, wherein the control means receives the pulse signal emitted by the signal emitting means and converts the pulse signal into an image signal.

5. The monitoring system of claim 4, wherein the control device generates the actual impression image from a plurality of the image signals.

6. The monitoring system according to claim 2, wherein the monitoring device includes a plurality of the piezoelectric sensors, the plurality of piezoelectric sensors being disposed at intervals in a width direction of the tire.

7. The monitoring system according to claim 2, wherein the monitoring device is adapted to be embedded in the tire, the tire having at least one tread pattern, the actual footprint image comprising at least one actual pattern image, the tread pattern being arranged in correspondence with at least one of the piezoelectric sensors.

8. The monitoring system of claim 7, wherein said control device generates said actual pattern image of said tread pattern based on a voltage signal from said piezoelectric sensor.

9. The monitoring system of claim 7, wherein said control device generates said actual pattern image of one of said tread patterns based on voltage signals from a plurality of said piezoelectric sensors.

10. The monitoring system of claim 1, wherein the monitoring system is configured to monitor the status of the monitoring system,

When the actual footprint image is the same as one of the at least one preset footprint image, judging that the wheel is positioned qualified;

And when the actual print image is different from the at least one preset print image, judging that the wheel is not positioned properly.

11. The monitoring system of claim 1, wherein the control device comprises:

The signal receiving device is in wireless connection with the monitoring device so as to receive the monitoring signal;

A memory storing the at least one preset print image; and

And the processor converts the monitoring signal into the actual impression image and compares the actual impression image with the preset impression image to judge whether the wheel positioning is qualified or not.

12. A monitoring method using the monitoring system according to claim 1, characterized in that the monitoring method comprises:

The monitoring device monitors the pressure born by the tire and generates a monitoring signal;

The monitoring device transmits the monitoring signal to the control device, and the control device converts the monitoring signal into an actual impression image of the tire;

the control device compares the actual footprint image with the at least one preset footprint image to judge whether the wheel positioning is qualified or not.

13. The method of monitoring as claimed in claim 12, wherein,

When the actual footprint image is the same as one of the at least one preset footprint image, judging that the wheel is positioned qualified;

And when the actual print image is different from the at least one preset print image, judging that the wheel is not positioned properly.