CN113341923A - Low-voltage wire harness fault detection method of vehicle, signal diagnosis unit and vehicle - Google Patents
Low-voltage wire harness fault detection method of vehicle, signal diagnosis unit and vehicle Download PDFInfo
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- CN113341923A CN113341923A CN202110623123.0A CN202110623123A CN113341923A CN 113341923 A CN113341923 A CN 113341923A CN 202110623123 A CN202110623123 A CN 202110623123A CN 113341923 A CN113341923 A CN 113341923A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
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- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
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Abstract
The application discloses low pressure pencil fault detection method, signal diagnosis unit and vehicle of vehicle, wherein, the method includes: when the signal diagnosis unit monitors that the actual number or the type of the whole vehicle signals is smaller than a signal threshold value, generating a first diagnosis message, and sending the first diagnosis message to a CAN (controller area network) of the vehicle; after receiving the first diagnosis message, the whole vehicle auxiliary controller on the CAN network executes a corresponding command, counts and judges the whole vehicle signal, and feeds back the counting judgment result to the signal diagnosis unit by using a feedback message; and the signal diagnosis unit judges the fault reason according to the information represented by the feedback message, generates a low-voltage wiring harness fault code, and reads the historical fault code related to the low-voltage wiring harness when the vehicle is maintained after sale. Therefore, the problems that in related after-sale maintenance, due to the fact that the vehicle cannot automatically judge and record accidental faults of the low-voltage wire harness, follow-up fault phenomena are difficult to reproduce, troubleshooting cost of fault reasons is high, user experience is poor and the like are solved.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a low-voltage wire harness fault detection method of a vehicle, a signal diagnosis unit and the vehicle.
Background
Along with the demand of users for vehicle individuation, more and more users can install external low-voltage apparatus additional on the vehicle, for example, vehicle event data recorder, audio amplifier, atmosphere lamp etc..
Due to the fact that operation is not standard in the process of installation, occasional faults of a low-voltage wire harness of the whole vehicle, such as short circuit or poor contact, are easily caused, and further occasional faults of a key system of the whole vehicle are caused. After the low-voltage wire harness of the whole vehicle breaks down, the signal of the whole vehicle in the CAN network is easy to be transmitted unstably and even lost in a transmission period, for example, an Electric Power Steering (EPS) system will briefly show a failure mode, and the failure phenomenon of poor contact of the low-voltage wire harness is generally difficult to reproduce.
However, since there is no fault code record for the accidental fault of the low-voltage wire harness, and the fault disappears after the vehicle is restarted or continues for a period of time, the fault cause is difficult to be checked, the fault checking cost is increased, the use experience of the user is reduced, and a solution is urgently needed.
Content of application
The application provides a low-voltage wire harness fault detection method of a vehicle, a signal diagnosis unit and the vehicle, and aims to solve the problems that follow-up fault reasons are difficult to troubleshoot, troubleshooting cost is increased, user experience is poor and the like due to the fact that accidental faults of the low-voltage wire harness cannot be recorded in the related technology.
An embodiment of a first aspect of the present application provides a low-voltage wiring harness fault detection method for a vehicle, including the following steps: when the signal diagnosis unit monitors that the actual number or the type of the whole vehicle signals is smaller than a signal threshold value, generating a first diagnosis message, and sending the first diagnosis message to a CAN (controller area network) of a vehicle; after receiving the first diagnosis message, the vehicle auxiliary controller on the CAN network executes a corresponding command, counts and judges the vehicle signal, and feeds back the counting and judging result to the signal diagnosis unit by using a feedback message; and the signal diagnosis unit judges the fault reason according to the information represented by the feedback message, generates a low-voltage wiring harness fault code, and reads the historical fault code related to the low-voltage wiring harness when the vehicle is maintained after sale.
Further, the vehicle auxiliary controller has high-speed CAN message communication and processing capabilities, executes a command according to the information represented by the diagnosis message, performs related message counting processing and relative threshold value judgment, and feeds back a judgment result to the signal diagnosis unit by using a feedback message, and the method includes: counting and judging the relative size of a first number of finished automobile signals and a first threshold value in a first diagnosis period by the finished automobile auxiliary controller, wherein the first threshold value is determined according to the first diagnosis period and the message period of the finished automobile signals; feeding back a counting judgment result by using the feedback message, wherein the counting judgment result comprises: the message first diagnosis period counting value is larger than the first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value, the signal diagnosis unit is used for analyzing fault reasons according to the diagnosis result, judging the low-voltage wiring harness fault of the whole vehicle and recording fault codes.
Further, still include: if the signal diagnosis unit does not receive the feedback of the whole vehicle auxiliary controller after the first diagnosis period or cannot judge the fault reason according to the counting judgment result, generating a second diagnosis message and sending the second diagnosis message to a CAN network of the vehicle; after the vehicle auxiliary controller receives the second diagnosis message, sending the analog CAN message with the specified format, length and period to a preset CAN message address in a second diagnosis period; the signal diagnosis unit detects a simulation CAN message in a second diagnosis period, and judges that the second quantity of the simulation CAN message in the second diagnosis period is smaller than a second threshold value through counting or detects that the simulation CAN message is not received so as to judge the fault reason of the low-voltage line and store a fault code; and displaying the historical fault code of the low-voltage line during vehicle maintenance, wherein the second threshold value is determined according to the second diagnosis period and the preset format, length, period and the like of the simulation message.
An embodiment of a second aspect of the present application provides a signal diagnosis unit of a vehicle, including: the diagnosis controller is used for generating a first diagnosis message when the actual number or the type of the vehicle signals is smaller than a signal threshold value, and sending the first diagnosis message to a CAN (controller area network) of the vehicle; receiving a counting judgment result fed back by the vehicle auxiliary controller by using a feedback message, judging a fault reason according to information represented by the feedback message, generating a low-voltage wiring harness fault code, and reading a historical fault code related to the low-voltage wiring harness when the vehicle is maintained after sale; and the vehicle controller executes a corresponding command after receiving the first diagnosis message by the vehicle auxiliary controller on the CAN network, counts and judges the vehicle signal, and feeds back the counting judgment result to the signal diagnosis unit by using a feedback message.
Furthermore, the vehicle auxiliary controller has high-speed CAN message communication and processing capacity, executes commands according to the information represented by the diagnosis message, performs related message counting processing and relative threshold value judgment, and feeds back the judgment result to the signal diagnosis unit by using the feedback message.
Further, the vehicle auxiliary controller is further configured to count and judge a relative size between a first number of the vehicle signals and a first threshold in a first diagnosis period, where the first threshold is determined according to the first diagnosis period and a message period of the vehicle signals; the diagnosis controller is further configured to feed back a counting judgment result by using the feedback packet, where the counting judgment result includes: the message first diagnosis period counting value is larger than the first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value, the signal diagnosis unit is used for analyzing fault reasons according to the diagnosis result, judging the low-voltage wiring harness fault of the whole vehicle and recording fault codes.
Further, the diagnosis controller is further configured to generate a second diagnosis message after the first diagnosis period without receiving feedback of the entire vehicle auxiliary controller or failing to determine a fault cause according to a counting determination result, send the second diagnosis message to a CAN network of the vehicle, simulate the CAN message in the second diagnosis period sent by the entire vehicle auxiliary controller, and determine, by counting, that a second number of the simulated CAN messages in the second diagnosis period is smaller than a second threshold value or that the simulated CAN message is not received, so as to determine a fault cause of the low-voltage line and store a fault code; displaying the historical fault code of the low-voltage line during vehicle maintenance, wherein the second threshold value is determined according to the second diagnosis period and the preset format, length, period and the like of the simulation message; and after receiving the second diagnosis message, the whole vehicle auxiliary controller sends the analog CAN message with the specified format, length and period to a preset CAN message address in a second diagnosis period.
An embodiment of a third aspect of the present application provides a vehicle, including the above embodiments, a signal diagnosis unit and a whole vehicle auxiliary controller of the vehicle, the signal diagnosis unit and the whole vehicle auxiliary controller both support CAN network communication. .
Therefore, the application has the following beneficial effects:
can be when whole car signal is unusual when for example the signal loses, utilize whole car auxiliary control ware supplementary judgement whole car low pressure pencil whether the trouble to through the sporadic trouble of trouble code in time record whole car low pressure pencil, with quick location trouble reason when the vehicle maintenance, can effectively reduce the troubleshooting degree of difficulty of whole car low pressure pencil trouble reason, and then reduce the cost of troubleshooting, promote user's use and experience. Therefore, the problems that follow-up fault causes are difficult to troubleshoot, fault troubleshooting cost is increased, user experience is poor and the like due to the fact that accidental faults of the low-voltage wire harness cannot be recorded in the related technology are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a low-voltage wiring harness fault detection method of a vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The present application is based on the inventors' findings and findings that:
in the process of development and after-sales maintenance of the whole vehicle, after the fault of abnormal power assistance of an EPS (electric power steering) system of the vehicle with a modified wire harness is checked for many times, the CAN message of the whole vehicle is completely monitored to be qualified without abnormal fault codes. After the examination, the situation that the EPS power assisting is abnormal due to poor contact of the wire harness providing CAN-L and CAN-H signals for the EPS and the fluctuation of the voltage and the resistance of the wire harness is found, however, the whole vehicle has no fault codes or communication failure. Meanwhile, the EPS system has no software and hardware faults, so that after-sale misjudgment is easily caused, and after the EPS parts are generally repaired and replaced after sale, the faults can occur occasionally.
The method and the device are based on the EPS system, and CAN help to investigate the case of accidental faults of poor contact of the low-voltage wire harness through the CAN message. The specific measures are that the EPS CAN immediately recover normal functions and performance by simulating and sending messages which are needed by the EPS and lost to the whole CAN network in a smaller period, and the follow-up troubleshooting reasons are caused by poor contact of overlapping wire bundles and periodic fluctuation of key messages.
A low-voltage harness fault detection method of a vehicle, a signal diagnosis unit, and a vehicle of the embodiments of the present application are described below with reference to the drawings. In the method, when a signal of the whole vehicle is abnormal, such as signal loss, whether the low-voltage wire harness of the whole vehicle fails or not can be judged by using a whole vehicle auxiliary controller, and the accidental failure of the low-voltage wire harness of the whole vehicle can be timely recorded through a failure code, so that the failure reason can be quickly positioned during vehicle maintenance, the difficulty in troubleshooting of the failure reason of the low-voltage wire harness of the whole vehicle can be effectively reduced, the failure troubleshooting cost is further reduced, and the use experience of a user is improved. Therefore, the problems that follow-up fault causes are difficult to troubleshoot, fault troubleshooting cost is increased, user experience is poor and the like due to the fact that accidental faults of the low-voltage wire harness cannot be recorded in the related technology are solved.
Specifically, fig. 1 is a schematic flow chart of a low-voltage wiring harness fault detection method of a vehicle according to an embodiment of the present application.
As shown in fig. 1, the low voltage harness fault detection method of the vehicle includes the steps of:
in step S101, when the signal diagnosis unit monitors that the actual number of the vehicle-mounted signals is smaller than the signal threshold, a first diagnosis message is generated, and the first diagnosis message is sent to the CAN network of the vehicle.
In the embodiment of the present application, an EPS (electric power steering) system is taken as an example, and the EPS system may be used as a signal diagnosis unit, where the signal diagnosis unit may also be a system similar to the EPS system on a CAN network, such as an engine operation management system. During the running process of the vehicle, the relevant messages are received through the CAN network to maintain normal functions and performances, and if the key messages of the whole vehicle are lost, namely the number or types of corresponding signals of the whole vehicle are lacked or lost during the use process, the functional performance of the electric power steering system is abnormal. After a certain key message is identified and lost, the embodiment of the application generates or requests a first diagnosis message and sends the first diagnosis message to the CAN.
Taking the EPS system as an example, in the working process of the EPS system, the whole vehicle is generally required to provide whole vehicle signals such as an ignition activation signal, a vehicle speed signal, a storage battery power supply signal, a power system readiness signal and the like, wherein the ignition activation signal is used for triggering the EPS system to activate and sleep. If such critical signals or physical conditions are absent or lost during operation, the EPS system will be caused to behave as a failure mode, such as a change in hand force or loss of function. The ignition activation signal, the vehicle speed signal and the ready signal of the power system (hereinafter referred to as powersystem prepared signal in the embodiment) are key and important message information of the EPS system, and the relevant controller CAN directly send the message information to the CAN network for use by other systems, or the message information is converted by the gateway through the signal format and the content and sent to the CAN network for use by other systems.
In this embodiment, the actual number of the vehicle signals can be detected in real time in the embodiment of the application, so that whether the vehicle signals are normal or not can be determined according to the actual number. Before detecting the actual number of finished automobile signals, in order to avoid fault misdiagnosis, the embodiment of the application can judge the normal driving condition, specifically: when the EPS system detects that the three signals are lost suddenly in the normal driving process of the vehicle, the EPS system can monitor the driver through the torque or the angle of a steering wheel, and can judge whether the driver drives normally or not through vehicle speed information or signals of an accelerator and a brake pedal, so that misjudgment of non-driving working conditions can be prevented, and misdiagnosis of faults can be avoided.
The signal threshold value can be set according to the type of the actual vehicle signal, and is not particularly limited; taking the powersystem predicted signal of the preset period as an example, if 95-105 powersystem predicted signals can be counted in 10 periods, the signal of the whole vehicle can be determined to be qualified, and therefore, the signal threshold range can be set to be 95-105 at this time. Wherein, the preset period may be set to 10ms or 20ms, etc.
It CAN be understood that when the actual number is far smaller than the signal threshold, it may be determined that there is a situation of signal loss of the entire vehicle, and in order to further determine the type of the fault, the embodiment of the present application may send the first diagnostic packet to the CAN network, so as to trigger the diagnostic function of the type of the fault.
In step S102, after the vehicle accessory controller on the CAN network receives the first diagnosis message, the vehicle accessory controller executes a corresponding command, counts and determines the vehicle accessory signal, and feeds back the count and determination result to the signal diagnosis unit by using the feedback message.
It CAN be understood that after receiving the diagnosis message, other vehicle auxiliary controllers on the vehicle CAN network immediately perform vehicle signal detection, and feed back the counting judgment result to the electric power steering system by using the feedback message, so that the vehicle controller is used for assisting in diagnosing the fault type, realizing a secondary diagnosis (or auxiliary diagnosis) function, and completing fault judgment of the vehicle low-voltage wire harness.
The Vehicle auxiliary controller may be a VCU (Vehicle control unit), a gateway, or other components that can receive or forward all Vehicle signals, or may be a system or controller that directly operates according to Vehicle signals. For example, when the vehicle signal is a steering wheel rotation angle signal, the VCU or the gateway may be used for auxiliary judgment, or the steering angle controller may be directly used for auxiliary judgment. Similarly, the auxiliary controllers CAN be one or more, and other signal diagnosis units similar to the electric power steering system are arranged on the whole vehicle CAN network, and the low-voltage wire harness fault CAN be judged and recorded by utilizing the principle.
In this embodiment, the entire vehicle auxiliary controller has high-speed CAN message communication and processing capabilities, executes a command according to information represented by a diagnostic message, performs related message counting processing and size judgment of a relative threshold, and feeds back a judgment result to the signal diagnosis unit by using a feedback message, and includes: counting and judging the relative size of a first number of vehicle signals and a first threshold value in a first diagnosis period by a vehicle auxiliary controller, wherein the first threshold value is determined according to the first diagnosis period and a message period of the vehicle signals; and feeding back a counting judgment result by using the feedback message, wherein the counting judgment result comprises the following steps: the message first diagnosis period counting value is larger than a first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value.
It can be understood that, in the embodiment of the present application, the relative magnitude between the first number of the vehicle signals and the first threshold in the first diagnosis period can be judged by counting the vehicle auxiliary controller, and the feedback message is utilized to feed back the counting judgment result, for example, in the first diagnosis period, the vehicle signal count is zero, the vehicle signal is smaller than the first threshold, the vehicle signal is equal to the first threshold, and the vehicle signal is greater than the first threshold, in four cases, the vehicle auxiliary controller will send the feedback message of different information to the electric power steering system according to different counting judgment results
The first diagnostic period may be set according to an actual situation, for example, if a message period of a vehicle signal is 10ms, the first diagnostic period may be set to be 1000ms for 100 message periods.
Because the number of finished vehicle signals corresponding to different message periods in the first diagnostic period is different, in the embodiment of the present application, the first threshold may be specifically set according to the first diagnostic period and the message period, for example, the first diagnostic period is 1000ms, the message period is 10ms, 95 to 105 signals may be counted in 1000ms, that is, it may be determined that the signals are qualified, and the first threshold may be set to be 95 to 105.
And after the finished automobile auxiliary controller counts and judges a finished automobile signal, feeding back a detection result to the electric power steering system through the auxiliary message. The feedback message is used for feeding back the detection result, and taking a powersystermsprevious signal as an example, the feedback message may specifically be, for example, 0x0 powersystermssage Ok (counting judgment 95-105), 0x1 powersystermssageonok (counting judgment <95), 0x2 powersystermssageonok (counting judgment >105), and 0x3 powersystermsaft Lost (counting judgment ═ 0).
In step S103, a low-voltage harness fault code is generated according to the result represented by the feedback message, and the low-voltage harness fault code is displayed during vehicle maintenance.
It can be understood that the electric power steering system comprehensively judges the generated low-voltage wiring harness fault code according to the result represented by the feedback message of the auxiliary controller and timely records the low-voltage wiring harness fault code, so that the low-voltage wiring harness fault code can be provided for maintenance personnel when a vehicle is maintained or maintained, the difficulty in troubleshooting of the fault reason of the low-voltage wiring harness of the whole vehicle is effectively reduced, and the troubleshooting cost is further reduced.
If the signal diagnosis unit does not receive the feedback message of the auxiliary controller of the entire vehicle after the first diagnosis period, wherein the case that the signal of the entire vehicle is not qualified in the first diagnosis period or the auxiliary controller of the entire vehicle does not receive the diagnosis message belongs to the case that the signal of the entire vehicle is not fed back after the first diagnosis period, in some embodiments, the method further includes:
if the signal diagnosis unit does not receive the feedback of the auxiliary controller of the whole vehicle after the first diagnosis period or cannot judge the fault reason according to the counting judgment result, generating a second diagnosis message and sending the second diagnosis message to a CAN network of the vehicle; after the vehicle auxiliary controller receives a second diagnosis message, sending a simulation CAN message with a specified format, length and period to a preset CAN message address in a second diagnosis period; the signal diagnosis unit detects that the simulated CAN messages in the second diagnosis period are smaller than a second threshold value through counting, or detects that the simulated CAN messages are not received, so as to judge the fault reason of the low-voltage line and store fault codes; and displaying the historical fault code of the low-voltage line during vehicle maintenance, wherein a second threshold value is determined according to a second diagnosis period and the preset format, length, period and the like of the simulation message.
The second diagnosis period may be set according to an actual situation, for example, the duration of 100 message periods may be set.
Since the number of finished vehicle signals corresponding to different message periods in the second diagnosis period is different, in the embodiment of the present application, a second threshold may be specifically set for the second diagnosis period and the message period of the finished vehicle signal in the preset format, which is not specifically limited. When the message period of the whole vehicle signal in the preset format is specifically set, the message period is recommended to be smaller than the original message period of the original whole vehicle signal, for example, the original message period of the whole vehicle is 10ms, and the analog message can be set to be 5 ms.
It can be understood that the signal diagnosis unit counts and judges the relative size of the second number of the analog message signals in the second diagnosis period and the second threshold, for example, in the second diagnosis period, the analog message signal count is zero, the analog message signal is smaller than the second threshold, the analog message signal is equal to the second threshold, and the analog message signal is greater than the second threshold, the signal diagnosis unit further diagnoses and generates a low-voltage wiring harness fault code according to the conditions, and can read the historical fault code of the low-voltage wiring harness when the vehicle is maintained.
Specifically, when the auxiliary diagnosis of the auxiliary controller of the whole vehicle still cannot determine the type of the fault, the auxiliary controller of the whole vehicle can be used for simulating and sending a signal of the whole vehicle with a specific format to diagnose again, and when the electric power steering system judges that the signal is still abnormal according to the number of the detection signals, the fault of a low-voltage line, such as open circuit, can be determined, and a fault code of the low-voltage line can be recorded in time. Therefore, maintenance personnel can be reminded when the vehicle is maintained or maintained, the difficulty in troubleshooting of the fault reason of the low-voltage wire harness of the whole vehicle is effectively reduced, and the troubleshooting cost is further reduced.
To further explain the fault detection method in the embodiment of the present application, an EPS system, a VCU or a gateway, and a 10ms period powersystem predicted signal with an original message address of X are taken as examples below, and the details are as follows:
(1) the Powersystem predicted signal with the original message address of X in the 10ms period is suddenly lost in the driving process of the vehicle, and the EPS finds that the Powersystem predicted signal is not received or is intermittent, but detects that the driver still drives. The EPS sends a CAN message address A agreed by both parties in advance to a VCU or a gateway (vehicle auxiliary controller) and continuously sends a 50-frame 0x1 Powersystem Disconnected message (first diagnosis message);
(2) after continuously receiving a 0X1 powersystem Disconnected signal of a CAN message address a, a VCU or a gateway immediately monitors and counts a powersystem signal in a CAN network (the gateway may receive hard-wire information and forward the hard-wire information into a powersystem message, and CAN directly judge through a hard-wire voltage), for example, a powersystem signal message of a 10ms address X in a period CAN count 95-105 powersystem prepped signals in 100 periods as qualified, and sends a 0X0 powersystem mask Ok to an a address, and otherwise, feeds back a 0X1 powersystem mask Nok (or CAN send various size judgment results, where two results of Ok and NOK are simply fed back);
(3) after receiving the 0x0powersystermMassage Ok message of the address A, recording an EPS fault Powersystermm message Bus off fault code 111101 (the EPS receives a Powersystermm signal fault), storing the vehicle mileage and the fault time until a diagnosis system of the EPS continuously stores 20 fault codes, and finally updating the information of the last fault code by the EPS controller. And the fault code is not cleared along with the ignition period of the whole vehicle or after the fault disappears, and can be read and cleared by after-sales maintenance diagnostic equipment.
(4) If the X address still continuously lacks an effective Powersystem predicted signal, continuously sending 50 frames of 0X3 Powersystem Mass acquisition to the A message address, and then sending 5ms period Powersystem predicted simulation message continuous 5S to the CAN network X address by the VCU or the gateway, and distinguishing by special characters or format marks;
(5) after the EPS controller receives a special Powersystem predicted signal with a smaller period sent by the gateway at the X message address, the EPS system returns to normal, and after the message lasts for 5S, the invalid failure of the Powersystem predicted message is still the same. At this time, a fault code 11102 (line fault of the EPS receiving Powersyster signal) is recorded, and the vehicle mileage and the fault time at this time are saved to an EPS diagnosis system. The fault code is not cleared along with the ignition cycle of the whole vehicle or after the fault disappears, and can be read and cleared by after-sales maintenance diagnostic equipment.
At the time of after-sales maintenance, the 4S store finds that the EPS system has the fault code. When the system is communicated with a customer, the historical fault code information is consistent with the power assistance abnormity reflected by the user or the lighting time of the fault lamp, the circuit abnormity or the infirm fault of the connector of the signal circuit can be checked, and the after-sale maintenance difficulty can be effectively reduced. For another example, a certain vehicle owner installs a 360-degree panoramic image reversing system for a new vehicle in a secondary automobile market, and the device needs to be connected with power from a fuse box and be connected in parallel by taking wires from a CAN (controller area network) network of the whole vehicle to acquire information such as the speed, gear and steering wheel angle of the vehicle. Because the original wire harness protection of the vehicle is damaged and the wiring operation is not standard, the vehicle is suddenly bumped or impacted in the running process, the low-voltage wire harness is occasionally short-circuited at the bumped or impacted position, and the steering assistance is abnormal for a short time. After restarting or driving for several seconds, the fault disappears, and the owner does not go to the 4S shop for consultation and investigation. In the after-sales maintenance process, the 4S store checks and finds that the EPS system has a special fault code, and by inquiring the vehicle owner, the abnormal performance mileage and time described by the vehicle owner are consistent, and the fault is not repeated again. And the 4S shop proposes that the car owner removes the additionally-installed equipment and the line from the safety view, and carefully inspects the safety of the section of the low-voltage wiring harness.
According to the low-voltage wiring harness fault detection method for the vehicle, when the signal of the whole vehicle is abnormal, such as signal loss, whether the low-voltage wiring harness of the whole vehicle breaks down or not can be judged in an auxiliary mode through the whole vehicle auxiliary controller, accidental faults of the low-voltage wiring harness of the whole vehicle can be recorded in time through fault codes, fault reasons can be located quickly when the vehicle is maintained, the difficulty of troubleshooting of the low-voltage wiring harness of the whole vehicle can be effectively reduced, the troubleshooting cost is further reduced, and the use experience of a user is improved.
Next, a signal diagnosis unit of a vehicle proposed according to an embodiment of the present application will be described.
In this embodiment, the signal diagnosis unit of the vehicle includes a diagnosis controller, where the diagnosis controller is configured to generate a first diagnosis message when the actual number or type of the vehicle signal is monitored to be smaller than a signal threshold, and send the first diagnosis message to a CAN network of the vehicle; and receiving a counting judgment result fed back by the vehicle auxiliary controller by using the feedback message, judging a fault reason according to information represented by the feedback message, generating a low-voltage wiring harness fault code, and reading a historical fault code related to the low-voltage wiring harness during after-sale maintenance of the vehicle. After receiving the first diagnosis message, the vehicle controller executes a corresponding command, counts and judges vehicle-finishing signals, and feeds back the counting judgment result to the signal diagnosis unit by using the feedback message.
Furthermore, the vehicle auxiliary controller has high-speed CAN message communication and processing capacity, executes commands according to the information represented by the diagnosis message, performs related message counting processing and relative threshold value judgment, and feeds back the judgment result to the signal diagnosis unit by using the feedback message.
Further, the vehicle auxiliary controller is further configured to count and judge a relative size between a first number of vehicle signals and a first threshold in a first diagnosis period, where the first threshold is determined according to the first diagnosis period and a message period of the vehicle signals; the diagnosis controller is further used for feeding back a counting judgment result by using the feedback message, wherein the counting judgment result comprises: the message first diagnosis period counting value is larger than a first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value.
Further, the diagnosis controller is also used for generating a second diagnosis message after the first diagnosis period without receiving the feedback of the finished automobile auxiliary controller or being incapable of judging the fault reason according to the counting judgment result, sending the second diagnosis message to a CAN network of the automobile, simulating the CAN message in the second diagnosis period sent by the finished automobile auxiliary controller, and judging that the second number of the simulated CAN messages in the second diagnosis period is smaller than a second threshold value or not receiving the simulated CAN message through counting to judge the fault reason of the low-voltage line and store the fault code; displaying historical fault codes of the low-voltage line during vehicle maintenance, wherein a second threshold value is determined according to a second diagnosis period and a preset format, length, period and the like of the simulation message; and after receiving the second diagnosis message, the whole vehicle auxiliary controller sends the analog CAN message with the specified format, length and period to a preset CAN message address in a second diagnosis period.
It should be noted that the foregoing explanation of the embodiment of the low-voltage wiring harness fault detection method for a vehicle is also applicable to the signal diagnosis unit of the vehicle in this embodiment, and is not repeated herein.
According to the signal diagnosis unit of vehicle that this application embodiment provided, can be when whole car signal is unusual for example the signal loses, utilize whole car auxiliary control ware supplementary judgement whole car low pressure pencil whether trouble to through the sporadic trouble of fault code in time record whole car low pressure pencil, with quick location fault reason when vehicle maintenance, can effectively reduce the troubleshooting degree of difficulty of whole car low pressure pencil fault reason, and then reduce the cost of troubleshooting, promote user's use and experience.
The embodiment also provides a vehicle, which comprises the signal diagnosis unit and the whole vehicle auxiliary controller of the vehicle, wherein both the signal diagnosis unit and the whole vehicle auxiliary controller support CAN network communication. This vehicle can be when whole car signal is unusual when for example the signal loses, utilize whole car auxiliary control ware supplementary judgement whole car low pressure pencil whether the trouble to through the sporadic trouble of trouble sign indicating number in time record whole car low pressure pencil, with quick location trouble reason when vehicle maintenance, can effectively reduce the troubleshooting degree of difficulty of whole car low pressure pencil trouble reason, and then reduce the cost of troubleshooting, promote user's use and experience.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. A low-voltage wiring harness fault detection method of a vehicle is characterized by comprising the following steps:
when the signal diagnosis unit monitors that the actual number or the type of the whole vehicle signals is smaller than a signal threshold value, generating a first diagnosis message, and sending the first diagnosis message to a CAN (controller area network) of a vehicle;
after receiving the first diagnosis message, the vehicle auxiliary controller on the CAN network executes a corresponding command, counts and judges the vehicle signal, and feeds back the counting and judging result to the signal diagnosis unit by using a feedback message;
and the signal diagnosis unit judges the fault reason according to the information represented by the feedback message, generates a low-voltage wiring harness fault code, and reads the historical fault code related to the low-voltage wiring harness when the vehicle is maintained after sale.
2. The method of claim 1, wherein the vehicle auxiliary controller has high-speed CAN message communication and processing capabilities, executes commands according to the information represented by the diagnostic messages, performs related message counting processing and relative threshold size determination, and feeds back the determination results to the signal diagnostic unit using feedback messages, including:
counting and judging the relative size of a first number of finished automobile signals and a first threshold value in a first diagnosis period by the finished automobile auxiliary controller, wherein the first threshold value is determined according to the first diagnosis period and the message period of the finished automobile signals;
feeding back a counting judgment result by using the feedback message, wherein the counting judgment result comprises: the message first diagnosis period counting value is larger than the first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value, the signal diagnosis unit is used for analyzing fault reasons according to the diagnosis result, judging the low-voltage wiring harness fault of the whole vehicle and recording fault codes.
3. The method of claim 2, further comprising:
if the signal diagnosis unit does not receive the feedback of the whole vehicle auxiliary controller after the first diagnosis period or cannot judge the fault reason according to the counting judgment result, generating a second diagnosis message and sending the second diagnosis message to a CAN network of the vehicle;
after the vehicle auxiliary controller receives the second diagnosis message, sending the analog CAN message with the specified format, length and period to a preset CAN message address in a second diagnosis period;
the signal diagnosis unit detects a simulation CAN message in a second diagnosis period, and judges that the second quantity of the simulation CAN message in the second diagnosis period is smaller than a second threshold value through counting or detects that the simulation CAN message is not received so as to judge the fault reason of the low-voltage line and store a fault code; and displaying the historical fault code of the low-voltage line during vehicle maintenance, wherein the second threshold value is determined according to the second diagnosis period and the preset format, length, period and the like of the simulation message.
4. A signal diagnosis unit of a vehicle, characterized by comprising:
the diagnosis controller is used for generating a first diagnosis message when the actual number or the type of the vehicle signals is smaller than a signal threshold value, and sending the first diagnosis message to a CAN (controller area network) of the vehicle; receiving a counting judgment result fed back by the vehicle auxiliary controller by using a feedback message, judging a fault reason according to information represented by the feedback message, generating a low-voltage wiring harness fault code, and reading a historical fault code related to the low-voltage wiring harness when the vehicle is maintained after sale; wherein the content of the first and second substances,
and the vehicle controller executes a corresponding command after the vehicle auxiliary controller on the CAN network receives the first diagnosis message, counts and judges the vehicle signal, and feeds back the counting judgment result to the signal diagnosis unit by using a feedback message.
5. The diagnostic unit of claim 4, wherein the vehicle auxiliary controller has high-speed CAN message communication and processing capabilities, executes commands according to the information represented by the diagnostic messages, performs related message counting processing and relative threshold value size judgment, and feeds back the judgment result to the signal diagnostic unit by using feedback messages.
6. The diagnostic unit of claim 5, wherein the entire vehicle auxiliary controller is further configured to count and determine a relative magnitude of a first number of the entire vehicle signals and a first threshold in a first diagnostic period, wherein the first threshold is determined according to the first diagnostic period and a message period of the entire vehicle signals;
the diagnosis controller is further configured to feed back a counting judgment result by using the feedback packet, where the counting judgment result includes: the message first diagnosis period counting value is larger than the first threshold value, the first diagnosis period counting value is equal to the first threshold value, and the first diagnosis period counting value is smaller than the first threshold value, the signal diagnosis unit is used for analyzing fault reasons according to the diagnosis result, judging the low-voltage wiring harness fault of the whole vehicle and recording fault codes.
7. The diagnostic unit of claim 5, wherein the diagnostic controller is further configured to generate a second diagnostic message after the first diagnostic period without receiving feedback from the auxiliary controller of the entire vehicle or failing to determine a fault cause according to a counting determination result, send the second diagnostic message to a CAN network of the vehicle, simulate the CAN message in the second diagnostic period sent by the auxiliary controller of the entire vehicle, and determine, by counting, that a second number of the simulated CAN messages in the second diagnostic period is smaller than a second threshold, or detect that the simulated CAN message is not received, so as to determine a fault cause of the low-voltage line and store a fault code; displaying the historical fault code of the low-voltage line during vehicle maintenance, wherein the second threshold value is determined according to the second diagnosis period and the preset format, length, period and the like of the simulation message; wherein the content of the first and second substances,
and after receiving the second diagnosis message, the whole vehicle auxiliary controller sends the analog CAN message with the specified format, length and period to a preset CAN message address in a second diagnosis period.
8. A vehicle comprising a signal diagnosis unit and a full car auxiliary controller of the vehicle as claimed in claims 4 to 7, wherein both the signal diagnosis unit and the full car auxiliary controller support CAN network communication.
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