KR20090131565A - Engine mounting parts deterioration diagnostic device and method - Google Patents

Abstract

The present invention is to accumulate and learn the intensity of the change in acceleration according to the tip in of the accelerator pedal in the diagnostic device of the vehicle to diagnose the aging or damage of the mounting parts, and to instruct the driver.

According to the present invention, the process of accelerating the engine with equal torque by controlling the opening of the throttle valve according to the displacement amount that is the tip of the accelerator pedal, the process of detecting the variation of the vehicle acceleration and then comparing the standard acceleration with the standard acceleration, the accumulated learning value If it is above the threshold value, the method includes determining that the engine mounting component is a failure.

Description

Apparatus and method for diagnosing degradation of engine mounting components {APPARATUS FOR DIAGNOSIS DETERIORATION AN ENGINE MOUNTING PORT AND METHOD THEREOF}

The present invention relates to a diagnostic apparatus for a vehicle, and more particularly, an engine for accumulating and learning an intensity change of acceleration according to tip in of an accelerator pedal to diagnose aging or breakage of a mounting part, and to instruct the driver to do so. The present invention relates to an apparatus and a method for diagnosing deterioration of a mounting part.

Recently, the application of ETC (Electric Throttle Control), which accurately reflects the driver's acceleration demand and provides fuel efficiency and emission improvement, has been gradually expanded in the vehicle compared to the mechanical throttle valve.

5 is a diagram schematically illustrating a vehicle on which an ETC is mounted.

When the driver tips the accelerator pedal 10 in order to accelerate the vehicle, the displacement information of the accelerator pedal 10 is applied to the controller 20 through an accelerator position sensor (APS) mounted on the accelerator pedal 10.

At this time, the controller 20 calculates the required torque by applying a torque map determined as a function of engine speed (RPM) and torque to the displacement of the accelerator pedal 10 and then applies the torque filter. .

The torque map is determined and set as a function of engine speed and torque according to the oscillation performance, the response of the accelerator pedal, the concept of the vehicle, and the like during the development of the vehicle.

Then, the required torque is converted into the amount of air to determine the opening amount of the throttle valve, and information of the determined opening amount is provided to the ETC 30.

Therefore, the ETC 30 adjusts the amount of air sucked into the engine by operating the actuator and adjusting the opening degree of the throttle valve according to the information of the opening amount applied from the control unit 20.

The torque filter smoothly raises the engine torque so that a shock that is suddenly started and generated in acceleration of the vehicle according to the tip-in is not generated.

That is, even if the driver tip-in the accelerator pedal 10 quickly, the throttle valve is opened to a level where an instantaneous acceleration shock is not generated by the filtering by the torque filter.

In this case, the filtering coefficients are mapped by physical characteristics according to the hardness and state of the mounting component including an engine roll stopper or a front / rear subframe mounting bushing.

For example, high hardness bushings increase the stiffness of the vehicle but increase shock at acceleration due to tip-in, and deteriorate driving performance.

As the vehicle ages, the mounting components harden or break, resulting in lower noise and vibration (NVH) performance in the vehicle.

For example, failure of an engine mounting component increases low frequency vibration generated in the engine during idling and low frequency shock in acceleration due to tip-in.

In addition, when the bushing inserted into the subframe of the chassis part is hardened or broken, the strength of the shock increases at acceleration due to the tip-in.

As described above, when the mounting component of the vehicle is deteriorated, various noises are generated and shock is generated at acceleration due to tip-in, thereby deteriorating driving performance and riding comfort.

However, current vehicles are not equipped with the technology to measure the deterioration of chassis parts, and the aged parts can be analyzed and diagnosed by the experience of maintenance experts. There is a problem.

The present invention has been invented to solve the above problems, the object is to compare the acceleration measured in the acceleration of the vehicle according to the tip-in cumulative learning the occurrence intensity of the shock, and the accumulated learning value is set threshold If the value is exceeded, it is determined that the engine mounting parts are aging and the driver is notified to induce rapid maintenance.

Engine mounting component deterioration diagnostic apparatus according to a feature of the present invention for realizing the above object,

An accelerator pedal sensor configured to output an electrical signal by detecting an operation displacement amount of the accelerator pedal;

At least one acceleration sensor for detecting acceleration information according to tip-in of the accelerator pedal;

According to the information of the accelerator pedal sensor, the engine output torque is adjusted by adjusting the opening degree of the throttle valve through the ETC, and the shock is learned by comparing the information of the acceleration sensor with the standard acceleration. A controller for determining aging of the component;

A display unit for indicating aging or failure of a mounting component in a predetermined manner according to the control of the controller;

A torque map determined by the engine speed and torque function, a standard acceleration table for the mounting component, a load-specific threshold table for shock determination, and a memory section for setting a table of threshold values for failure determination of the mounting component.

In addition, the engine mounting component deterioration diagnostic method according to a feature of the present invention,

Accelerating the engine to equal torque by controlling the opening of the throttle valve according to the displacement amount that is the tip of the accelerator pedal;

Detecting a variation in acceleration of the vehicle and then comparing the standard acceleration to learn a deviation;

If the accumulated learning value is greater than or equal to the threshold value, determining the engine mounting component as a failure.

According to the above-described configuration, the present invention provides self-diagnosis of an aging state or a breakage state of an engine mounting part in a vehicle to notify a driver whether to check or replace a part, thereby providing a quick replacement of an aging part to generate noise and vibration. It is expected that the effect of providing a comfortable ride and stability by excluding the above-mentioned will be.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

1 is a view schematically showing an engine mounting component deterioration diagnostic apparatus according to an embodiment of the present invention.

The present invention is the accelerator pedal sensor 101, the first acceleration sensor 102, the second acceleration sensor 103, the third acceleration sensor 104, the control unit 105, ETC 106, memory unit 107 and And a display unit 108.

The accelerator pedal sensor 101 detects the displacement amount according to the tip-in of the accelerator pedal (not shown) and outputs the information about the displacement as an electrical signal to the controller 105.

The first acceleration sensor 102 is installed in front of the vehicle, and provides the acceleration information according to the tip-in to the control unit 105 to be used to determine whether the mounting parts of the engine and the transmission are aging.

The second acceleration sensor 103 is installed at the center of the vehicle and provides acceleration information according to the tip-in to the controller 105 to be used to determine the deterioration degree of the engine subframe mounting component.

The third acceleration sensor 104 is installed at the rear side of the vehicle and provides acceleration information according to the tip-in to the controller 105 to be used to determine the degree of deterioration of the rear wheel subframe mounting component.

The first, second and third acceleration sensors 102, 103 and 104 may be mounted as a separate sensor, and apply a sensor mounted to control an airbag system or an electronic stability program (ESP) system. Acceleration information can be provided through CAN communication with the system or the ESP system.

The controller 105 detects the required torque by applying the displacement information detected by the accelerator pedal sensor 101 to the torque map determined as a function of the engine speed RPM and the torque, and applies the torque filter to apply the current engine. Adjust to generate equal torque according to the rotation speed.

Then, the required torque is converted into the amount of air to determine the opening amount of the throttle valve, and the information of the determined opening amount is provided to the ETC 106 so that the opening degree of the throttle valve is adjusted by the ETC 106, thereby outputting the engine's output torque. Adjust it.

In addition, the controller 105 maps the acceleration detected by the first acceleration sensor 102, the second acceleration sensor 103, and the fourth acceleration sensor 104 in the acceleration according to the tip-in to the memory unit 107. The shock is learned by comparing with the set acceleration, and when the accumulated value is greater than the set threshold, it is determined that the specific mounting part is due to aging, and the driver through the display unit 108 induces maintenance of the vehicle. Notify in a predetermined manner.

The ETC 106 adjusts the output torque of the engine by adjusting the opening degree of the throttle valve according to the control signal applied from the controller 105.

The memory unit 107 has a torque map determined as a function of engine speed and torque according to the oscillation performance, the response of the accelerator pedal, and the concept of the vehicle during the development of the vehicle.

In addition, the memory unit 107 is set a load-specific threshold table for determining the standard acceleration and shock for the mounting component and a table of the threshold for failure determination of the mounting component.

The display unit 107 instructs the aging state or damage state, maintenance or replacement information of the mounting component diagnosed by the control unit 105 in a predetermined manner.

Referring to the operation of the present invention that includes the above-described function in detail as follows.

When the driver tips in the accelerator pedal while the vehicle is stopped or running, the accelerator pedal sensor 101 detects the displacement amount of the accelerator pedal and applies information about the accelerator pedal to the controller 105 (S101).

The controller 105 extracts the required torque according to the current driving conditions by applying the information of the accelerator pedal sensor 101, which is a driver's request signal, to the torque map set as shown in Table 1 below (S102).

RPM (→) APS (↓) 1000 2000 … 6000 10 10.0 9.0 … 5.0 20 15.0 13.0 … 11.0 30 25.0 22.0 … 20.0 40 40.0 35.0 … 30.0 · · · . · 100 100.0 100.0 … 100.0

Subsequently, the extracted required torque is applied to a torque filter set as a map table in the memory unit 107 to convert into equal torque so that equal torque can be generated according to the engine RPM, thereby accelerating shock due to a sudden torque change. Is prevented from occurring (S103).

Then, the amount of air according to the required torque is calculated (S104), and the opening amount of the throttle valve according to the calculated air amount is determined (S105), and then the opening speed and the opening amount of the throttle valve are adjusted through the ETC 106 (S106). ).

The torque filter is applied with a filtering coefficient selected as the optimum point of responsiveness and shock in the vehicle development stage.

Table 2 below is a map table of a tip-in bump torque filter, and Table 3 is a torque filter map table of Ne (engine rotational speed)-Nt (turbine rotational speed).

0 10 20 30 40 50 60 70 80 90 100 0.20 0.20 0.20 0.20 0.15 0.15 0.15 0.15 0.15 0.15 0.15

-200 -100 -60 -40 -20 -10 0 10 20 40 60 100 200 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.3 0.5 0.9 0.9 0.9 0.9

As described above, as the ETC 106 adjusts the opening degree of the throttle valve to reflect the required torque according to the tip-in of the accelerator pedal, a change in acceleration occurs in the vehicle.

In this case, the controller 105 may include a first acceleration sensor 102 installed at the front of the vehicle, a second acceleration sensor 103 installed at the center of the vehicle, and a third acceleration sensor 104 installed at the rear side of the vehicle. Measure the acceleration according to the tip-in through (S107).

Then, by analyzing the measured acceleration as a function of time to extract the amount of change of acceleration (S108) and compares with the standard acceleration according to the conditions of each engine RPM set in the memory unit 107 to determine whether the change in acceleration is greater than the set reference value (S109).

In the determination of S109, when the amount of change of acceleration is less than the set reference value, it is determined that the engine mounting part and the transmission mounting part maintain a normal state. Learn and accumulate (S110).

The threshold value for the shock determination is set to a map table as shown in Table 4 below.

         RPM (→) Load (%) (↓) 1000 2000 3000 4000 20 1.010 1.020 1.035 1.040 30 1.030 1.050 1.070 1.090 40 1.050 1.080 1.105 1.140 · · · · · 90 1.090 1.140 1.175 1.240 100 1.110 1.170 1.210 1.290

In operation S111, it is determined whether the accumulated learning value is greater than or equal to a threshold set for failure determination of the mounting component.

The threshold value set for failure determination of the mounting part is set as shown in Table 5 below, for example.

RPM (→) Load (%) (↓) 1000 2000 3000 4000 20 0.710 0.720 0.735 0.740 30 0.730 0.750 0.770 0.790 40 0.750 0.780 0.805 0.840 · · · · · 90 0.790 0.840 0.875 0.940 100 0.810 0.870 0.910 0.990

If the accumulated learning value in the determination of S111 is equal to or less than a threshold set for mounting failure determination, the accumulated learning value is returned to the process of S102 by applying the accumulated learning value as a correction factor of the torque filter (S112).

However, if the accumulated learning value in the determination of S111 is greater than or equal to the threshold set for the determination of the mounting failure, the controller 105 determines that the mounting component is a failure (S113), and outputs and stores a failure code for the display part (S113). Through 108, the failure of the mounting component is indicated in a predetermined manner (S114).

If the accumulated learning value detected by the first acceleration sensor 102 is equal to or greater than a threshold value of the failure determination, it is determined that the engine and the mounting parts of the transmission are aging.

In addition, when the accumulated learning value detected through the second acceleration sensor 103 is equal to or greater than the threshold value of the failure determination, it is determined that the engine subframe mounting component is deteriorated.

In addition, if the accumulated learning value detected through the third acceleration sensor 104 is equal to or greater than the threshold value of the failure determination, it is determined that the rear wheel subframe mounting component is deteriorated.

3 illustrates the acceleration measured when tipping the accelerator pedal in a driving state of the vehicle.

For example, in a vehicle to which the automatic transmission is applied, when the driver tip-in the accelerator pedal, the engine and turbine are directly disconnected and the engine torque is increased, causing the acceleration change in the vehicle. Measured by 102, 103, 104 and applied to the control unit 105.

As shown in FIG. 4, the control unit 105 passes the measured acceleration g through the low pass filter to convert the acceleration change amount g_grad, and the acceleration change amount g_grad is determined according to the engine speed and the load. If only the value exceeding the value g_grad_thrsh (g_index) and the cumulative value exceeds the threshold value of the failure determination, it is determined that the engine and the transmission mounting parts are aging.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

1 is a diagram illustrating a schematic configuration of an apparatus for diagnosing degradation of an engine mounting component according to an exemplary embodiment of the present invention.

2 is a diagram illustrating an engine mounting part deterioration diagnostic diagnosis procedure according to an embodiment of the present invention.

3 is a view illustrating changes of various signals according to tip-in of an accelerator pedal in a vehicle.

4 is a diagram illustrating a determination process of diagnosing component deterioration using acceleration according to tip-in of an accelerator pedal in an embodiment of the present invention.

5 is a diagram illustrating a schematic configuration of a vehicle on which an ETC is mounted.

<Explanation of symbols for the main parts of the drawings>

101: acceleration pedal sensor 102: the first acceleration sensor

103: second acceleration sensor 104: control unit

105: ETC 106: memory

107: display unit

Claims (9)

An accelerator pedal sensor configured to output an electrical signal by detecting an operation displacement amount of the accelerator pedal; At least one acceleration sensor for detecting acceleration information according to tip-in of the accelerator pedal; According to the information of the accelerator pedal sensor, the engine output torque is adjusted by adjusting the opening degree of the throttle valve through the ETC, and the shock is learned by comparing the information of the acceleration sensor with the standard acceleration. A controller for determining aging of the component; A display unit for indicating aging or failure of a mounting component in a predetermined manner according to the control of the controller; A memory unit in which a torque map determined by an engine speed and torque function, a standard acceleration table for the mounting component, a load-specific threshold table for shock determination, and a table of threshold values for failure determination of the mounting component are set; Engine mounting component deterioration diagnostic apparatus comprising a. The method of claim 1, The acceleration sensor may include a first acceleration sensor installed in front of the vehicle to provide aging determination information of the mounting parts of the engine and the transmission; A second acceleration sensor installed in the center of the vehicle to provide deterioration determination information of the engine subframe mounting component; An engine mounting component deterioration diagnosis apparatus including a third acceleration sensor installed at a rear side of a vehicle and providing deterioration determination information of a rear wheel subframe mounting component. The method of claim 1, The acceleration sensor is applied to the sensor mounted for the control of the airbag system, ESP system, the engine mounting component degradation degree diagnostic device is provided with the acceleration information in CAN communication. Accelerating the engine to equal torque by controlling the opening of the throttle valve according to the displacement amount that is the tip of the accelerator pedal; Detecting a variation in acceleration of the vehicle and then comparing the standard acceleration to learn a deviation; Determining the engine mounting component as a failure when the accumulated learning value is greater than or equal to a threshold value; Engine mounting parts deterioration diagnostic method comprising a. The method of claim 4, wherein And a method for diagnosing deterioration of an engine mounting part when it is determined that the accumulated accumulated learning value in front of the vehicle is equal to or greater than a threshold. The method of claim 4, wherein And a method of diagnosing deterioration of an engine mounting component when the accumulated accumulation learning value of the center of the vehicle is equal to or greater than a threshold value. The method of claim 4, wherein And an engine mounting part deterioration degree diagnosis method that determines that the rear wheel subframe mounting part is deteriorated when the acceleration accumulation learning value of the rear side of the vehicle is equal to or greater than a threshold value. The method of claim 4, wherein And a method for diagnosing deterioration of an engine mounting part applying the acceleration accumulation learning value as a correction factor of a torque filter. The method of claim 4, wherein The method of diagnosing deterioration of an engine mounting part, wherein the amount of change in acceleration of the vehicle according to the tip-in is provided from an acceleration sensor for controlling an airbag system and an ESP system.

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