CN113238545B - Vehicle control unit activation signal detection device, vehicle control unit and vehicle - Google Patents
Vehicle control unit activation signal detection device, vehicle control unit and vehicle Download PDFInfo
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Abstract
The application discloses vehicle control unit activation signal detection device, vehicle control unit and vehicle belongs to automobile production technical field. Wherein, the device includes: at least one sampling module and a micro control unit; the sampling module is connected in series between the output end of an activation signal input module of the whole vehicle controller and the input end of the micro control unit; the activation signal input module is used for generating and outputting at least one activation signal; the sampling module is used for sampling the signal characteristics of the output end of the activation signal input module and outputting the sampled signal characteristics and the activation signal to the micro control unit; the micro control unit is used for comparing the sampled signal characteristic with a reference signal characteristic and outputting the activation signal when the sampled signal characteristic is determined to be matched with the reference signal characteristic. The technical problem of vehicle control unit VCU malfunction caused by the existence of interference signals is solved.
Description
Technical Field
The application relates to the technical field of automobile production, in particular to a vehicle control unit activation signal detection device, a vehicle control unit and a vehicle.
Background
In recent years, with the continuous improvement of the quality of life of people, automobiles gradually enter the public transportation field and families, become travel tools of people, and vehicles with various purposes are produced. At present, an electronic key is generally adopted for a vehicle, and a key signal of the electronic key has three gears, namely a LOCK gear, an ACC gear and an ON gear, wherein the ACC gear is an accessory electrifying gear for connecting the power supply of partial electrical equipment of the vehicle, such as an air conditioner and the like, and the ON gear is a connecting gear for connecting a whole vehicle circuit. In addition, there is a charge gun signal A +. And the key signals ACC and ON and the charging gun signal A + form an activation signal of the VCU of the whole vehicle controller. The three signals are combined or related and are respectively connected to an activation circuit of a Vehicle Control Unit (VCU). The VCU is equivalent to the brain of a vehicle, is at the highest level in a whole vehicle control system, and has a vital influence on the performance of the vehicle. Because the working environment of the vehicle is complex, various interferences exist, an interference signal enters an activation signal in an accidental situation, and the VCU has misoperation on the working state of the vehicle, so that potential safety hazards are caused.
Disclosure of Invention
In order to solve the problem of misoperation of the vehicle control unit caused by interference signals or mistaken touch, the application provides a device for detecting the activation signals of the vehicle control unit, the vehicle control unit and a vehicle.
According to an aspect of an embodiment of the present application, there is provided a vehicle control unit activation signal detection apparatus including:
at least one sampling module and a micro control unit;
the sampling module is connected in series between the output end of an activation signal input module of the whole vehicle controller and the input end of the micro control unit;
the activation signal input module is used for generating and outputting at least one activation signal;
the sampling module is used for sampling the signal characteristics of the output end of the activation signal input module and outputting the sampled signal characteristics and the activation signal to the micro control unit, wherein the signal characteristics comprise at least one of waveform, voltage and signal intensity;
the micro control unit is used for comparing the sampled signal characteristic with a reference signal characteristic and outputting the activation signal when the sampled signal characteristic is determined to be matched with the reference signal characteristic.
Further, the above scheme further comprises that when the signal characteristic comprises a voltage, the sampling module comprises a voltage sampling module;
the voltage sampling module is used for sampling the voltage of a first output end of the activation signal input module and outputting the sampled voltage of the first output end to a first input end of the micro control unit;
the micro control unit is used for comparing the sampled voltage of the first output end with a first reference voltage and outputting the first activation signal when the voltage of the first output end is determined to be matched with the first reference voltage.
Further, the above scheme further includes that the voltage sampling module includes: the first filter circuit, the first voltage divider circuit, the second filter circuit, the first pull-down circuit and the first clamping circuit;
the first end of the first filter circuit is connected with the first output end of the activation signal input module, and the second end of the first filter circuit is grounded; a first end of the first voltage division circuit is connected with a first end of the first filter circuit, a second end of the first voltage division circuit is connected with a first input end of the micro control unit, and a third end of the first voltage division circuit is grounded; a first end of the second filter circuit is connected with a second end of the first voltage division circuit, and a second end of the second filter circuit is grounded; the first end of the first pull-down circuit is connected with the first end of the first filter circuit, and the second end of the first pull-down circuit is grounded; the first end of the first clamping circuit is connected with the second end of the first voltage division circuit, and the second end of the first clamping circuit is grounded.
Further, the above scheme further includes the first filter circuit, including: a first filter capacitor;
the first voltage division circuit comprises a first voltage division resistor and a second voltage division resistor which are connected in series;
the second filter circuit includes: a second filter capacitor;
the first pull-down circuit includes: a first pull-down resistor;
the first end of the first filter capacitor is connected with the first output end of the activation signal input module, and the second end of the first filter capacitor is grounded; a first end of the first voltage-dividing resistor is connected with a first end of the first filter capacitor, a second end of the first voltage-dividing resistor is connected with a first input end of the micro control unit and a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; the first end of the second filter capacitor is connected with the second end of the first divider resistor, and the second end of the second filter capacitor is grounded; the first end of the first pull-down resistor is connected with the first end of the first filter capacitor, and the second end of the first pull-down resistor is grounded.
Further, the above solution further includes that the first clamping circuit includes a first clamping diode; the first end of the first clamping diode is connected with the second end of the first voltage division circuit, and the second end of the first clamping diode is grounded;
or the like, or a combination thereof,
the first clamping circuit is arranged in the clamping chip; the first input end of the clamping chip is connected with the second end of the first voltage division circuit, and the first output end of the clamping chip is connected with the first input end of the micro control unit.
Furthermore, the scheme also comprises a power supply circuit, a power supply filter circuit and an activation circuit;
the power supply filter circuit is connected between the anode of an external power supply and the input end of the power supply circuit in series, the input end of the activation circuit is connected with the first output end of the activation signal input module, and the output end of the activation circuit is connected with the control end of the power supply circuit; the output end of the power supply circuit is connected with the power supply input end of the micro control unit and used for supplying power to the micro control unit.
Further, the above scheme further includes that the power supply filter circuit includes: the anti-reverse circuit, the fourth clamping circuit and the filter are arranged;
the positive electrode of the anti-reverse circuit is used as the input end of the power supply filter circuit, the negative electrode of the anti-reverse circuit is connected with the first end of the fourth clamping circuit and the first end of the filter, the second end of the filter is connected with the first end of the power supply circuit and is used as the output end of the power supply filter circuit, and the second end of the fourth clamping circuit is grounded.
Further, the above scheme further includes that the filter includes a Π -type filter;
the anti-reverse circuit comprises an anti-reverse diode;
the fourth clamping circuit comprises a fourth clamping diode;
the first end of the pi-type filter is connected with the negative electrode of the anti-reverse circuit and the first end of the fourth clamping circuit, and the second end of the pi-type filter is connected with the first end of the power supply circuit and serves as the output end of the power supply filter circuit; the positive electrode of the anti-reverse diode is used as the input end of the power supply filter circuit, the negative electrode of the anti-reverse diode is connected with the first end of the fourth clamping diode and the first end of the n-type filter, and the second end of the fourth clamping diode is grounded.
According to another aspect of the embodiment of the application, a vehicle control unit is further provided, and the vehicle control unit includes any one of the vehicle control unit activation signal detection devices described above.
According to another aspect of the embodiment of the application, a vehicle is further provided, and the vehicle comprises the vehicle control unit activation signal detection device in any one of the aspects.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the device for detecting the vehicle control unit activation signal provided by the embodiment of the application comprises a sampling module, a micro control unit and a power supply filter circuit, wherein the sampling module is used for sampling the signal characteristics of the output end of an activation signal input module and outputting the sampled signal characteristics to the micro control unit, the micro control unit is used for comparing the sampled signal characteristics with the reference signal characteristics and outputting the activation signal when the sampled signal characteristics are matched with the reference signal characteristics, and the signal characteristics comprise at least one of waveform, voltage and signal strength.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a vehicle control unit activation signal detection device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another vehicle control unit activation signal detection device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another activation signal detection device of a vehicle control unit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another vehicle control unit activation signal detection device according to an embodiment of the present application;
fig. 5A is a schematic structural diagram of another activation signal detection device of a vehicle control unit according to an embodiment of the present disclosure;
fig. 5B is a schematic structural diagram of another activation signal detection device of a vehicle control unit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another vehicle control unit activation signal detection device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a power filter circuit according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another power filter circuit provided in the embodiment of the present application;
fig. 9 is a schematic configuration diagram of the vehicle control unit.
The reference numbers are as follows:
101-sampling module, 102-micro control unit, 103-activation signal input module;
201-a voltage sampling module;
301-a first filter circuit, 302-a second filter circuit, 311-a first voltage divider circuit, 321-a first pull-down circuit, 331-a first clamp circuit;
c1-a first filter capacitor, C2-a second filter capacitor, C3-a third filter capacitor, C4-a fourth filter capacitor, C5-a fifth filter capacitor, C6-a sixth filter capacitor, R2-a first divider resistor, R3-a second divider resistor, R5-a third divider resistor, R6-a fourth divider resistor, R8-a fifth divider resistor, R9-a sixth divider resistor, R1-a first pull-down resistor, R4-a second pull-down resistor, R7-a third pull-down resistor, D1-a first clamping diode, D2-a second clamping diode, D3-a third clamping diode, and U3-a clamping chip;
601-power supply circuit, 602-power supply filter circuit, 603-activation circuit;
701-an anti-reflection circuit, 702-a fourth clamping circuit and 703-a filter;
the filter comprises a 801-pi type filter, a D301-anti-reflection diode and a D302-fourth clamping diode.
Detailed Description
In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments, and the illustrative embodiments and descriptions thereof of the present application are used for explaining the present application and do not constitute a limitation to the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another similar entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In one aspect of the embodiments of the present application, to avoid a problem that a VCU of a vehicle control unit malfunctions due to an interference signal, a vehicle control unit activation signal detection device is provided, as shown in fig. 1, the detection device includes:
at least one sampling module 101 and a micro control unit 102;
the sampling module 101 is connected in series between the output end of the activation signal input module 103 of the vehicle control unit and the input end of the micro control unit 102;
an activation signal input module 103 for generating and outputting at least one activation signal;
the sampling module 101 is used for sampling the signal characteristics of the output end of the activation signal input module and outputting the sampled signal characteristics and the activation signal to the micro control unit 102, wherein the signal characteristics comprise at least one of waveform, voltage and signal strength;
and the micro control unit 102 is used for comparing the sampled signal characteristic with a reference signal characteristic and outputting an activation signal when the sampled signal characteristic is determined to be matched with the reference signal characteristic.
In this embodiment, the signal characteristics of the activation signal are sampled by the sampling module, and compared with the reference signal characteristics in the micro control unit, the activation signal is output when the signal is judged to be a correct signal, and the interference signal is eliminated, wherein the signal characteristics may be one or more of waveform, voltage and signal intensity. When the signal characteristic is a waveform, sampling the waveform of the activation signal through the sampling module, outputting the sampled waveform and the activation signal to the micro control unit, comparing the sampled waveform and the activation signal with a reference waveform in the micro control unit, judging the sampled waveform to be a correct signal when the sampled waveform is matched with the reference waveform, and outputting the activation signal by the micro control unit. When the signal characteristic is the signal strength, the signal strength of the activation signal is sampled through the sampling module, the sampled signal strength and the activation signal are output to the micro control unit and are compared with the reference signal strength in the micro control unit, and when the sampled signal strength is determined to be matched with the reference signal strength, the signal is judged to be a correct signal, and the micro control unit outputs the activation signal. When the signal characteristic is voltage, sampling the voltage of the activation signal through the sampling module, outputting the sampled voltage and the activation signal to the micro control unit, comparing the sampled voltage and the activation signal with reference voltage in the micro control unit, judging the sampled voltage to be correct signal when the sampled voltage is matched with the reference voltage, and outputting the activation signal by the micro control unit. When the signal characteristics are various, the sampling module samples various signal characteristics and compares the various signal characteristics with corresponding various reference signal characteristics.
In this embodiment, the activation signal may be one of a key signal or a signal gun signal, such as a key signal ON, a key signal ACC, or a charging gun signal. When the activation signal is the key signal ON and the sampled signal characteristic is voltage, the sampling module samples the voltage of the key signal ON and inputs the sampled voltage and the activation signal into the micro control unit, the micro control unit compares the sampled voltage with the reference voltage and outputs the key signal ON when the matching is determined, and at the moment, the whole vehicle circuit is switched ON. When the activation signal is the other activation signal, the sampling module samples the other signal characteristics, and the principle is the same. The activation signal is detected firstly, and the activation signal is output only when the activation signal is judged to be the correct activation signal, so that the misoperation of the whole vehicle controller caused by the interference signal can be avoided, and the safety performance is improved.
In one embodiment, as shown in fig. 2, when the signal characteristic comprises a voltage, the sampling module comprises a voltage sampling module 201;
a voltage sampling module 201, configured to sample a voltage at a first output terminal of the activation signal input module 103, and output the sampled voltage at the first output terminal to a first input terminal of the micro control unit 102;
and the micro control unit 102 is used for comparing the sampled voltage of the first output end with a first reference voltage and outputting a first activation signal when the voltage of the first output end is determined to be matched with the first reference voltage.
In this embodiment, the sampling module is a voltage sampling module, and multiple groups of voltage sampling modules may be set according to the type of the activation signal. The activation signal may be a key signal ON, a key signal ACC, or a gun signal, or may be a start key signal or other key signals in a vehicle having a keyless start function, and may individually identify a plurality of different activation signals. Specifically, three activation signals are exemplified, the first activation signal corresponding to the key signal ON, the second activation signal corresponding to the key signal ACC, and the third activation signal corresponding to the charger signal a +. The voltage corresponding to the key signal ON is 24V, the first reference voltage corresponds to 23.8V-24.2V, the voltage corresponding to the key signal ACC is 24V, the second reference voltage corresponds to 23.8V-24.2V, the voltage corresponding to the charging gun signal A + is 12V, and the third reference voltage corresponds to 11.8V-12.2V. Taking the key signal ON as an example, if the voltage obtained by sampling the key signal ON through the first voltage sampling module and calculating through the micro control unit is within the first reference voltage range, the key signal ON is output to start the vehicle, and if the voltage is not within the first reference range, the key signal ON is judged to be a false operation, the vehicle control unit enters a sleep state, and the signal is not processed, so that interference signals generated by false touch or relay interference and other reasons can be effectively eliminated, and the safety and the reliability of the vehicle are ensured. The number of the sampling modules can be set according to the types and the number of different activation signals contained in different vehicle types, and is not limited to the above.
In one embodiment, as shown in fig. 3, the voltage sampling module 201 includes: a first filter circuit 301, a first voltage divider circuit 311, a second filter circuit 302, a first pull-down circuit 321, and a first clamp circuit 331;
a first end of the first filter circuit 301 is connected to a first output end of the activation signal input module 103, and a second end of the first filter circuit 301 is grounded; a first end of the first voltage dividing circuit 311 is connected to a first end of the first filter circuit 301, a second end of the first voltage dividing circuit 311 is connected to a first input end of the micro control unit 102, and a third end of the first voltage dividing circuit 311 is grounded; a first end of the second filter circuit 302 is connected to a second end of the first voltage divider circuit 311, and a second end of the second filter circuit 302 is grounded; a first end of the first pull-down circuit 321 is connected to a first end of the first filter circuit 301, and a second end of the first pull-down circuit 321 is grounded; a first end of the first clamping circuit 331 is connected to the second end of the first voltage dividing circuit 311, and a second end of the first clamping circuit 331 is grounded.
In this embodiment, the first activation signal of the activation signal input module corresponds to a key signal ON, the second activation signal corresponds to a key signal ACC, the third activation signal corresponds to a charging gun signal a +, an I1 port of the micro control unit is a first input terminal of the micro control unit, an I2 port is a second input terminal, and an I3 port is a third input terminal. The voltage corresponding to the key signal ON is 24V, the first reference voltage corresponds to 23.8V-24.2V, the voltage corresponding to the key signal ACC is 24V, the second reference voltage corresponds to 23.8V-24.2V, the voltage corresponding to the charging gun signal A + is 12V, and the third reference voltage corresponds to 11.8V-12.2V. Taking the first voltage sampling module as an example, an input key signal ON passes through the first filter circuit, the first pull-down circuit, the first voltage divider circuit, the second filter circuit and the first clamp circuit to obtain a first sampling voltage, and then is input to the micro control unit through the I1 port, the micro control unit compares the voltage obtained by calculating the first sampling voltage with a first reference voltage, if the voltage is within the range, the key signal ON is output, a vehicle is started, and if the voltage is not within the first reference range, the key signal ON is judged to be a false operation, the whole vehicle controller enters a sleep state, and signals are not processed. The key signal ACC, the charger signal and the other activation signals operate in the same manner. Interference signals generated by reasons such as mistaken touch or relay interference can be effectively eliminated, and safety and reliability of the vehicle are guaranteed. The working principle of the second voltage sampling module and the third voltage sampling module is the same as that of the first voltage sampling module.
In one embodiment, as shown in figure 4,
a first filter circuit 301, comprising: a first filter capacitor C1;
the first voltage dividing circuit 311 includes: the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3 are connected in series;
a second filter circuit 302, comprising: a second filter capacitor C2;
the first pull-down circuit 321 includes: a first pull-down resistor R1;
a first end of the first filter capacitor C1 is connected to a first output end of the activation signal input module 103, and a second end of the first filter capacitor C1 is grounded; a first end of the first voltage-dividing resistor R2 is connected to a first end of the first filter capacitor C1, a second end of the first voltage-dividing resistor R2 is connected to a first input end of the micro-control unit 102 and a first end of the second voltage-dividing resistor R3, and a second end of the second voltage-dividing resistor R3 is grounded; a first end of the second filter capacitor C2 is connected to a second end of the first voltage-dividing resistor R2, and a second end of the second filter capacitor C2 is grounded; the first end of the first pull-down resistor R1 is connected with the first end of the first filter capacitor C1, and the second end of the first pull-down resistor R1 is grounded.
In this embodiment, the output port of the activation signal input module corresponds to the key signal ON, and the input port of the micro control unit is the first input port of the micro control unit. The C1, the R2, the R3 and the C2 and the first clamping circuit form a first voltage sampling module. Specifically, the first voltage sampling module performs voltage division sampling ON the voltage input by the key signal ON by using voltage dividing resistors R2 and R3, the sampled voltage is filtered by a second filter capacitor C2, and the first clamping circuit clamps the divided voltage to protect the micro control unit. The micro control unit compares the voltage obtained by calculating the first sampling voltage with a first reference voltage, if the voltage is within a set error range, a key signal is output to be ON, the vehicle is started, if the voltage is not within the error range of the first reference voltage, the key signal is judged to be false operation, the vehicle control unit enters a dormant state, signals are not processed, interference signals generated due to false touch or relay interference and the like can be effectively eliminated, and safety and reliability of the vehicle are guaranteed. The working principle of the voltage sampling modules corresponding to other activation signals such as the key signal ACC and the charger signal is the same as above.
In one embodiment, as shown in fig. 5A, the first clamping circuit 331 includes a first clamping diode D1;
a second clamping circuit comprising a second clamping diode D2;
a third clamping circuit comprising a third clamping diode D3;
a first end of the first clamping diode D1 is connected to the second end of the first voltage dividing circuit 311, and a second end of the first clamping diode D1 is grounded; a first end of the second clamping diode D2 is connected with a second end of the second voltage division circuit, and a second end of the second clamping diode D2 is grounded; a first end of the third clamping diode D3 is connected to the second end of the third voltage dividing circuit, and a second end of the third clamping diode D3 is grounded. C1, R2, R3, C2 and D1 form a first voltage sampling module, C3, R4, R5, R6, C4 and D2 form a second voltage sampling module, and C5, R7, R8, R9, C6 and D3 form a third voltage sampling module. The O1 port of the activation signal input module is a first output end of the activation signal input module, the O2 port is a second output end of the activation signal input module, the O3 port is a third output end of the activation signal input module, the O1 corresponds to the key signal ON, the O2 port corresponds to the key signal ACC, the O3 port corresponds to the charging gun signal A +, the I1 port of the micro control unit is a first input end of the micro control unit, the I2 port is a second input end, and the I3 port is a third input end. The first voltage sampling module is used for sampling the voltage of the key signal ON and outputting the divided voltage to a first input end of the MCU. The second voltage sampling module is used for sampling the voltage of the key signal ACC and outputting the divided voltage to a second input end of the MCU. And the third voltage sampling module is used for sampling the voltage of the charger signal A + and outputting the divided voltage to a third input end of the MCU. Specifically, the effective value of the input voltage 24v of ON, the effective value of the input voltage 24V of acc, and the effective value of the input voltage 12V of charger a +, as shown in fig. 5A, are input to the I/O port of the MCU of the VCU by way of resistance voltage division, and are synchronously input to the activation signal module of the VCU in fig. 9. The divider resistor R2 corresponding to the ON gear sampling signal is 47k omega, and R3 is 7.5k omega. The voltage dividing resistor R5 corresponding to the ACC level sampling signal is 47k omega, the voltage dividing resistor R6 corresponding to the ACC level sampling signal is 7.5k omega, the voltage dividing resistor R8 corresponding to the A + signal sampling signal is 47k omega, and the voltage dividing resistor R9 corresponding to the A + signal sampling signal is 12k omega. ACC gear (24V), ON gear (24V) and A + signal (12V) are respectively ACC gear (3.3V), ON gear (3.3V) and A + signal (2.44V) after resistance voltage division. The MCU reads and calculates a real voltage value through software setting, and respectively judges whether a key signal ACC, a key signal ON and a charging gun signal A + are effective values, the actual voltage effective value range of the ACC is 23.8V-24.2V, and if the ACC voltage signal detected by the MCU is an effective value, the signal is judged to be a correct ACC key signal by the MCU; if the ACC voltage signal detected by the MCU is not a valid value, the signal is judged to be an error ACC key signal, the MCU enters a low power consumption mode, and the signal is not processed.
It should be noted that the resistance value of the voltage dividing resistor may be changed, and is not limited to the above resistance value, and the voltage value obtained by dividing the voltage by the resistor may also be changed according to the change of the resistance value as long as the voltage dividing effect is achieved, and the protection scope of the present application is not limited to the above specific numerical value of the electronic device.
Similarly, the ON and A + are also in a resistance voltage division mode, voltage signals are input into an I/O port of the MCU, voltage values are read through software, and if the ON and A + voltage signals detected by the MCU are effective values (the effective value range of the true voltage of the ON is 23.8V-24.2V, and the effective value range of the true voltage of the A + is 11.8V-12.2V), the signals are judged to be correct ON and A + key signals by the MCU; if the detected ON and A + voltage signals of the MCU are not effective values, the signals are judged to be wrong ON and A + key signals, the MCU enters a low power consumption mode, and the signals are not processed.
The purpose of doing so is to improve the reliability of key signal, the rifle signal that charges, prevents that key signal, the rifle signal that charges from receiving relay interference (for example about 4V), inputs wrong signal for VCU, causes the potential safety hazard to the vehicle work of whole.
In this embodiment, the clamping circuit uses a clamping diode to clamp the voltage at the input end of the micro control unit, so as to protect the micro control unit and prevent the micro control unit from being damaged by overhigh input voltage.
In one embodiment, as shown in fig. 5B, the first clamping circuit 331, the second clamping circuit, and the third clamping circuit are disposed in the clamping chip U3;
the first input end of the clamping chip U3 is connected to the second end of the first voltage divider 311, the second input end of the clamping chip U3 is connected to the second end of the second voltage divider, the third input end of the clamping chip U3 is connected to the second end of the third voltage divider, the first output end of the clamping chip U3 is connected to the first input end of the micro control unit 102, the second output end of the clamping chip U3 is connected to the second input end of the micro control unit 102, and the third output end of the clamping chip U3 is connected to the third input end of the micro control unit 102.
Compared with the previous embodiment, the present embodiment employs a clamping chip, and although one clamping chip is more expensive than one clamping diode, the clamping chip has a plurality of terminals, and may replace a plurality of clamping diodes. When the number of the clamping diodes is increased, the number of the diode assemblies is increased, and the space occupied by the PCB is increased, the alternative scheme can be selected, so that the cost can be reduced, and the space occupied by the PCB can be saved.
In this embodiment, the clamp circuit is a clamp chip, and may be another circuit that can implement a clamping function. The clamping circuit is used, so that the situation that the input voltage is too high and the MCU in the VCU is damaged can be prevented.
In one embodiment, as shown in fig. 6, the method further includes: a power supply circuit 601, a power supply filter circuit 602, and an activation circuit 603;
the power filter circuit 602 is connected in series between the positive electrode of the external power supply and the input end of the power circuit 601; the input end of the activation circuit 603 is connected with the output end of the first activation signal, the output end of the second activation signal and the output end of the third activation signal, and the output end of the activation circuit 603 is connected with the control end of the power supply circuit 601; the output terminal of the power supply circuit 601 is connected to the power supply input terminal of the micro control unit 102, and is used for supplying power to the micro control unit 102.
In this embodiment, the external power supply is filtered first to prevent damage to the internal circuit caused by an excessively high input voltage or reverse connection.
In one embodiment, as shown in fig. 7, the power filter circuit 602 includes: an anti-kickback circuit 701, a fourth clamp circuit 702, and a filter 703;
the positive electrode of the anti-reverse circuit 701 is used as the input end of the power supply filter circuit 602, the negative electrode of the anti-reverse circuit 701 is connected with the first end of the fourth clamping circuit 702 and the first end of the filter 703, the second end of the filter 703 is connected with the first end of the power supply circuit 601 and used as the output end of the power supply filter circuit 602, and the second end of the fourth clamping circuit 702 is grounded.
In this embodiment, the first end of the power supply circuit 601 is connected to a power supply chip in the power supply circuit, the anti-reverse circuit is configured to protect the power supply circuit when an external power supply is connected in reverse, the filter is configured to prevent the power supply circuit from being damaged by an excessively high input voltage, and the fourth clamping circuit clamps and protects the input voltage.
In one embodiment, as shown in fig. 8, the filter 703 includes a pi-type filter 801, the anti-blocking circuit 701 includes an anti-blocking diode D301, the fourth clamping circuit 702 includes a fourth clamping diode D302, a first end of the pi-type filter 801 is connected to a negative electrode of the anti-blocking circuit 701 and a first end of the fourth clamping circuit 702, and a second end of the pi-type filter 801 is connected to a first end of the power supply circuit 601 as an output end of the power supply filter circuit 602; the anode of the anti-reverse diode D301 serves as the input end of the power supply filter circuit 602, the cathode of the anti-reverse diode D301 is connected to the first end of the fourth clamping diode D302 and the first end of the pi-type filter 801, and the second end of the fourth clamping diode D302 is grounded.
In this embodiment, specifically, 24V is an anode of an external power supply, D301 is an anti-reverse diode, D302 is a clamping diode, L301 is an inductor, C307, C308, C309, and C317 are filter capacitors, and VIN is an output end of a power supply filter circuit. L301, C307, C308, C309 and C317 form a pi-type filter, and a first end of the power supply circuit 601 is connected with a power supply chip in the power supply circuit. The D301 is used for preventing the input voltage of the external power supply from being reversely connected, and a power supply chip in the power supply circuit is damaged. D302 is used for preventing the power chip from being damaged due to overhigh activation signal input by the external power supply.
In one embodiment, as shown in fig. 9, the control terminal of the power circuit may be formed by: and the D4 and D5 diodes are used for clamping and preventing the rear electrode circuit from being damaged due to overhigh input activation signal. R10 and R13 are pull-down resistors. R11 and R12, and R15 and R14 function as voltage dividing resistors. R11 and R12 are 100 k.OMEGA.and 10 k.OMEGA.respectively. U1 is an N-channel MOS tube, U2 is a P-channel MOS tube, and the function of the switch is equivalent. When an activation signal is input and the voltage is divided by the resistors, the VGS voltage of the N-channel MOS tube U1 is larger than the breakover voltage VGS (th), the N-channel MOS tube U1 is conducted, and R14 is grounded. When the activation signal is interfered by the relay (for example, about 4V), the voltage value is only 0.36V (lower than U1 conducting voltage VGS (th)) after the voltage division by the resistor, the U1 is not conducted, the rear electrode circuit of the activation circuit does not work, the power supply circuit does not work, and therefore the protection effect can also be achieved. In order to make the safety performance of the vehicle better, the two schemes are adopted at the same time, namely the switch circuit of the embodiment is used at the control end of the power circuit, and the activation signal detection device is added at the same time, so that the safety performance of the vehicle can be greatly improved, and the vehicle safety performance is particularly improved in the public transportation field with high safety performance requirements, such as an electric bus.
In another embodiment provided by the present application, a vehicle control unit is further provided, where the vehicle control unit includes any one of the vehicle control unit activation signal detection apparatuses in the above embodiments. The signal detection device is activated through the vehicle control unit, interference signals are eliminated, and safety and reliability of the vehicle can be improved.
In another embodiment provided by the application, a vehicle is further provided, and the vehicle comprises any vehicle control unit activation signal detection device in the above embodiments. The signal detection device is activated through the vehicle control unit, so that the safety and the reliability of the vehicle can be improved.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the scope of protection of the present application.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A vehicle control unit activation signal detection device is characterized by comprising:
at least one sampling module and a micro control unit;
the sampling module is connected in series between the output end of an activation signal input module of the whole vehicle controller and the input end of the micro control unit;
the activation signal input module is used for generating and outputting at least one activation signal;
the sampling module is used for sampling the signal characteristics of the activation signal and outputting the signal characteristics and the activation signal to the micro control unit, wherein the signal characteristics comprise at least one of waveform, voltage and signal intensity;
the micro control unit is used for comparing the signal characteristic with a reference signal characteristic and outputting the activation signal when the signal characteristic is determined to be matched with the reference signal characteristic;
wherein when the signal feature comprises a voltage, the sampling module comprises a voltage sampling module;
the voltage sampling module is used for sampling the voltage at the output end of the activation signal input module and outputting the voltage to the input end of the micro control unit;
the micro control unit is used for comparing the voltage with a first reference voltage and outputting the activation signal when the voltage is determined to be matched with the first reference voltage;
when the signal characteristic comprises a waveform, the sampling module is used for sampling the waveform of the activation signal and outputting the sampled waveform and the activation signal to the micro control unit; the micro control unit is used for comparing the waveform with a reference waveform, judging the sampled waveform to be a correct signal when the waveform is matched with the reference waveform, and outputting the activation signal;
when the signal characteristic comprises signal strength, the sampling module is used for sampling the signal strength of the activation signal and outputting the sampled signal strength and the activation signal to the micro control unit; and the micro control unit is used for comparing the signal intensity with a reference signal intensity, judging the signal to be a correct signal when the sampled signal intensity is matched with the reference signal intensity, and outputting the activation signal.
2. The vehicle control unit activation signal detection device according to claim 1, wherein the voltage sampling module comprises: the first filter circuit, the first voltage divider circuit, the second filter circuit, the first pull-down circuit and the first clamping circuit;
the first end of the first filter circuit is connected with the first output end of the activation signal input module, and the second end of the first filter circuit is grounded; the first end of the first voltage division circuit is connected with the first end of the first filter circuit, the second end of the first voltage division circuit is connected with the first input end of the micro control unit, and the third end of the first voltage division circuit is grounded; the first end of the second filter circuit is connected with the second end of the first voltage division circuit, and the second end of the second filter circuit is grounded; the first end of the first pull-down circuit is connected with the first end of the first filter circuit, and the second end of the first pull-down circuit is grounded; the first end of the first clamping circuit is connected with the second end of the first voltage division circuit, and the second end of the first clamping circuit is grounded.
3. The vehicle control unit activation signal detection device according to claim 2,
the first filter circuit includes: a first filter capacitor;
the first voltage dividing circuit includes: the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series;
the second filter circuit includes: a second filter capacitor;
the first pull-down circuit includes: a first pull-down resistor;
the first end of the first filter capacitor is connected with the first output end of the activation signal input module, and the second end of the first filter capacitor is grounded; a first end of the first voltage-dividing resistor is connected with a first end of the first filter capacitor, a second end of the first voltage-dividing resistor is connected with a first input end of the micro control unit and a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; the first end of the second filter capacitor is connected with the second end of the first divider resistor, and the second end of the second filter capacitor is grounded; the first end of the first pull-down resistor is connected with the first end of the first filter capacitor, and the second end of the first pull-down resistor is grounded.
4. The vehicle control unit activation signal detection device according to claim 3,
the first clamping circuit comprises a first clamping diode; the first end of the first clamping diode is connected with the second end of the first voltage division circuit, and the second end of the first clamping diode is grounded;
or the like, or, alternatively,
the first clamping circuit is arranged in the clamping chip; the first input end of the clamping chip is connected with the second end of the first voltage division circuit, and the first output end of the clamping chip is connected with the first input end of the micro control unit.
5. The vehicle control unit activation signal detection device according to claim 1, further comprising: the power supply circuit, the power supply filter circuit and the activation circuit;
the power supply filter circuit is connected between the anode of an external power supply and the input end of the power supply circuit in series; the input end of the activation circuit is connected with the first output end of the activation signal input module, and the output end of the activation circuit is connected with the control end of the power supply circuit; the output end of the power supply circuit is connected with the power supply input end of the micro control unit and used for supplying power to the micro control unit.
6. The vehicle control unit activation signal detection device according to claim 5, wherein the power filter circuit comprises: the anti-reverse circuit, the fourth clamping circuit and the filter are arranged;
the positive electrode of the anti-reverse circuit is used as the input end of the power supply filter circuit, the negative electrode of the anti-reverse circuit is connected with the first end of the fourth clamping circuit and the first end of the filter, the second end of the filter is connected with the first end of the power supply circuit and is used as the output end of the power supply filter circuit, and the second end of the fourth clamping circuit is grounded.
7. The vehicle control unit activation signal detection device of claim 6, wherein the filter comprises a Π -type filter;
the anti-reverse circuit comprises an anti-reverse diode;
the fourth clamping circuit comprises a fourth clamping diode;
the first end of the pi-type filter is connected with the negative electrode of the anti-reverse circuit and the first end of the fourth clamping circuit, and the second end of the pi-type filter is connected with the first end of the power supply circuit and serves as the output end of the power supply filter circuit; the positive electrode of the anti-reverse diode is used as the input end of the power supply filter circuit, the negative electrode of the anti-reverse diode is connected with the first end of the fourth clamping diode and the first end of the n-type filter, and the second end of the fourth clamping diode is grounded.
8. A vehicle control unit, characterized by comprising the vehicle control unit activation signal detection device according to any one of claims 1 to 7.
9. A vehicle characterized by comprising the vehicle control unit of claim 8.
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| CN202110480642.6A CN113238545B (en) | 2021-04-30 | 2021-04-30 | Vehicle control unit activation signal detection device, vehicle control unit and vehicle |
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| CN202110480642.6A CN113238545B (en) | 2021-04-30 | 2021-04-30 | Vehicle control unit activation signal detection device, vehicle control unit and vehicle |
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| CN113900709B (en) * | 2021-10-29 | 2024-12-24 | 努比亚技术有限公司 | A circuit and method for activating a download mode of a microcontroller unit MCU |
| CN114253198B (en) * | 2022-02-28 | 2022-09-02 | 深圳市地木升能源科技有限公司 | Control circuit of EVCC control system of electric automobile |
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