Circuit fault diagnosis method, system self-checking device, medium and controller
By adopting the first pulse excitation and time-limited diagnosis steps in electronic circuit fault diagnosis, the problem that the actuator cannot be diagnosed in the offline state in the prior art is solved, and flexible and efficient fault diagnosis of the actuator is achieved.
Patent Information
- Application Number
- CN202411325492.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-03-14
AI Technical Summary
The existing electronic circuit fault diagnosis method cannot be effectively diagnosed when the actuator is offline, and is not applicable to applications with low frequency of use of hybrid vehicles or actuators. There is a contradiction between the offline state of the actuator and the dependence of the diagnostic process on the actuator.
A circuit fault diagnosis method is adopted, through the first pulse excitation step and the second time limit diagnosis step, a first pulse sequence of a preset width is connected to the actuator driving terminal, and the circuit state of the actuator is determined based on the value characteristics and range of the second voltage sequence to realize fault diagnosis of the actuator.
Diagnosis is performed without waiting for the actuator to be in operation. It is suitable for scenarios such as low frequency of actuator use or hybrid vehicles, improving the flexibility and efficiency of diagnosis.
Smart Images
Figure CN119619792A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of electronic circuits, and in particular relates to a circuit fault diagnosis method, a system self-checking device, a medium and a controller. Background Art
[0002] Fault diagnosis of electronic circuits is an effective supplement to their reliability. By reasonably arranging diagnostic schemes, the harm of their functional failure to online applications can be avoided as much as possible. Actuators, sensors and other components containing electronic circuits are important components of automation systems. They can be used to implement intervention actions or detect related signals, and then used to change the working state of the application system or force it to enter a preset working stage.
[0003] Common faults in electronic circuits include open circuit, short circuit to ground and short circuit to power supply. All three types of faults can cause product failure. For example, in vehicle applications, this can cause driver-level failures in functional units such as injectors and ignition coils, leading to engine misfires or even starting failures, which is not conducive to the safe and stable operation of the entire vehicle.
[0004] The relevant diagnostic scheme, affected by the structure of the actuator electromagnetic coil, can only be effectively implemented when the system is started, that is, when the relevant actuator is in working condition. Its flexibility and efficiency need to be improved. At the same time, for hybrid vehicles or applications where the actuator is used less frequently, diagnosis may not be carried out in a timely manner. It is urgent to overcome the inherent contradiction between the offline state of the actuator and the dependence of the diagnostic process on the actuator. Summary of the invention
[0005] An embodiment of the present invention discloses a circuit fault diagnosis method, whose core processing process includes a first pulse excitation step and a second time-limited diagnosis step; the first pulse excitation step connects a first pulse sequence to a ninth actuator drive terminal PIN, requiring that the width of the first pulse sequence is less than a second delay time, and the second delay time is the minimum interval time between the first moment when the ninth actuator is powered on and the second moment when the ninth actuator starts to perform a preset action and / or performs a preset function; the second time-limited diagnosis step obtains a second voltage sequence of the drive terminal PIN, and determines the circuit state of the ninth actuator according to the value characteristics and / or value range of the second voltage sequence.
[0006] The circuit status may cover the main fault status of the component to be diagnosed, including at least one of a first no-fault status, a second power short-circuit status, a third ground short-circuit status, and a fourth open-circuit fault status.
[0007] Specifically, the ninth actuator involved in the circuit fault diagnosis method can be used to drive and / or control preset functional components of the vehicle internal combustion engine; the above-mentioned functional components include at least one of a fuel injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
[0008] Among them, the ninth actuator includes a ninth low-side drive actuator and / or a ninth high-side drive actuator; its ninth low-side drive actuator is bridged between the first low-level trigger terminal and the ninth power supply terminal, and the ninth high-side drive actuator is bridged between the first high-level trigger terminal and the ninth ground terminal; its first low-level trigger terminal or the first high-level trigger terminal is electrically connected to the drive terminal PIN to receive a trigger signal; the trigger information can come from the controller of the existing system or a similar intelligent device.
[0009] Specifically, when the first pulse sequence does not exist or during the first pulse sequence transmission interval, the first low level trigger terminal is at the same level as the ninth power supply terminal or the first high level trigger terminal is at the same level as the ninth ground terminal, then the ninth actuator does not have a drive level failure or the circuit state is normal.
[0010] Furthermore, the circuit fault diagnosis method may also be provided with a third customized triggering step; a third count value (333) A of the first pulse sequence may be set, and a third minimum voltage sequence Vmin-n and a third maximum voltage sequence Vmax-n of the second voltage sequence may be obtained, and then the circuit state may be determined according to the value characteristics and / or value range of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n; wherein the third count value A is a preset positive integer.
[0011] Specifically, the mth counter Nm can be used to count the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n. When the accumulated value of the mth counter Nm reaches the third count value A, the circuit state is in the mth state; m=1, 2, 3 or 4; m=1 corresponds to the first fault-free state, m=2 corresponds to the second power supply short-circuit state, m=3 corresponds to the third ground short-circuit state, and m=4 corresponds to the fourth open-circuit fault state.
[0012] Among them, if the value of the third minimum voltage sequence Vmin-n component is less than the first lower limit calibration value B1 and the value of the third maximum voltage sequence Vmax-n component is greater than the first upper limit calibration value C1, the first counter increases by 1; if the first counter reaches the third count value A, the ninth actuator does not have a drive level fault or the circuit state is normal.
[0013] Similarly, if the values of the respective components of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n are between the i-th lower limit calibration value Bi and the j-th upper limit calibration value Cj, the m-th counter Nm increases by 1; when the m-th counter reaches the third count value A, the ninth actuator is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
[0014] Furthermore, the circuit fault diagnosis method may also be provided with a fourth information integration step; triggering the first pulse excitation step and / or the second time-limited diagnosis step according to the application scenario of the ninth actuator; wherein the ninth actuator also includes a preset sensor for executing a preset physical quantity detection process, and the sensor includes a temperature sensor and / or a pressure sensor.
[0015] Among them, the ninth actuator can provide intervention actions for the internal combustion engine and / or the vehicle; the vehicle can be an extended-range vehicle REEV or a plug-in hybrid electric vehicle PHEV. If the starting frequency of the internal combustion engine is less than a preset percentage, the beneficial effect of this solution can be better exerted; otherwise, the execution of the first pulse excitation step and / or the second time-limited diagnosis step can be prohibited, that is, to avoid repeated actions of related diagnostic processes and save hardware resources.
[0016] Specifically, the value characteristics and / or value range can be determined by comparing the values of each component of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n with the preset i-th lower limit calibration value Bi and the preset j-th upper limit calibration value Cj, where i is equal to j and is any value of 2, 3 or 4.
[0017] Correspondingly, an embodiment of the present invention also discloses a system self-test device, whose core components include a first pulse excitation unit and a second time-limited diagnostic unit; the first pulse excitation unit can connect the first pulse sequence to the ninth actuator drive terminal PIN, and the width of the first pulse sequence must be less than the second delay time to avoid the ninth actuator from producing actual mechanical action or electromagnetic response.
[0018] Among them, the second delay time is the minimum interval time between the first moment when the ninth actuator is powered on and the second moment when the ninth actuator starts to execute the preset action and / or perform the preset function; its second time-limited diagnostic unit obtains the second voltage sequence of the drive terminal PIN, and determines the circuit state of the ninth actuator according to the value characteristics and / or value range of the second voltage sequence.
[0019] Specifically, its circuit state can also be divided into at least one of a first fault-free state, a second power supply short-circuit state, a third ground short-circuit state, and a fourth open circuit fault state; its ninth actuator can be used to drive and / or control preset functional components of the vehicle internal combustion engine; its functional components can be at least one of a fuel injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
[0020] Similarly, its ninth actuator includes a ninth low-side drive actuator and / or a ninth high-side drive actuator; the ninth low-side drive actuator is connected between the first low-level trigger terminal and the ninth power supply terminal, and the ninth high-side drive actuator is connected between the first high-level trigger terminal and the ninth ground terminal; the first low-level trigger terminal or the first high-level trigger terminal is electrically connected to the drive terminal PIN; if when the first pulse sequence does not exist or during the first pulse sequence transmission interval, the first low-level trigger terminal is at the same level as the ninth power supply terminal or the first high-level trigger terminal is at the same level as the ninth ground terminal, then the ninth actuator does not have a drive level fault or the circuit state is normal.
[0021] Furthermore, a third customized trigger unit may be provided; a third count value A of the first pulse sequence may be set, and a third minimum voltage sequence Vmin-n and a third maximum voltage sequence Vmax-n of the second voltage sequence may be obtained, and the circuit state may be determined according to the value characteristics and / or value ranges of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n; and the third count value A is a preset positive integer.
[0022] Specifically, the mth counter Nm can also be used to count the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n. When the accumulated value of the mth counter Nm reaches the third count value A, the circuit state is in the mth state; m=1, 2, 3 or 4; m=1 corresponds to the first fault-free state, m=2 corresponds to the second power supply short-circuit state, m=3 corresponds to the third ground short-circuit state, and m=4 corresponds to the fourth open-circuit fault state.
[0023] Among them, if the value of the component of the third minimum voltage sequence Vmin-n is less than the first lower limit calibration value B1 and the value of the component of the third maximum voltage sequence Vmax-n is greater than the first upper limit calibration value C1, the first counter increases by 1; if the first counter reaches the third count value A, the ninth actuator does not have a drive level fault or the circuit state is normal; if the values of the respective components of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n are between the i-th lower limit calibration value Bi and the j-th upper limit calibration value Cj, the m-th counter Nm increases by 1; when the m-th counter reaches the third count value A, the ninth actuator is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
[0024] Furthermore, a fourth information integration unit may be provided; the first pulse excitation unit and / or the second time-limited diagnosis unit may be triggered according to the application scenario of the ninth actuator; wherein the ninth actuator also includes a sensor for executing a preset physical quantity detection process, and the sensor may be a temperature sensor and / or a pressure sensor; wherein: the ninth actuator provides intervention actions for the internal combustion engine and / or the vehicle; the vehicle may be a range-extended vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), and the starting frequency of the internal combustion engine is less than a preset percentage; otherwise, the use of the first pulse excitation unit and / or the second time-limited diagnosis unit may be prohibited.
[0025] Among them, the value characteristics and / or value range can be determined by comparing the values of the respective components of the third minimum voltage sequence Vmin-n and the third maximum voltage sequence Vmax-n with the preset i-th lower limit calibration value Bi and the preset j-th upper limit calibration value Cj, where i is equal to j and is any value of 2, 3 or 4.
[0026] In addition, an embodiment of the present invention also discloses a computer storage medium and a controller; the computer storage medium includes a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, any of the above circuit fault diagnosis methods can be implemented; the controller includes any of the above fault self-detection devices and / or computer storage media, which can be used to solve the same technical problems and achieve the same technical effects.
[0027] In summary, the first pulse excitation step / unit of the present invention sends a first pulse sequence of preset width, collects a second voltage sequence of the drive terminal, and determines the circuit state of the ninth actuator according to the value characteristics and / or value range of the second voltage sequence; the third customized triggering step / unit sets the third count value, and obtains the third minimum voltage sequence and the third maximum voltage sequence of the second voltage sequence to optimize the feature extraction capability; the fourth information integration step / unit schedules the above-mentioned diagnostic window according to different scenarios; the method and product do not require the actuator or sensor to be tested and other components to be in working state, and are particularly suitable for early diagnosis of drive-level faults of extended-range vehicles (REEV), plug-in hybrid electric vehicles (PHEV), etc.
[0028] It should be noted that the terms "first", "second" and similar terms used in this article are only for describing the various components in the technical solution, and do not constitute a limitation of the technical solution, nor can they be understood as an indication or suggestion of the importance of the corresponding elements; elements with "first", "second" and similar terms indicate that the corresponding technical solution contains at least one of the element. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solution of the present invention and facilitate further understanding of the technical effects, technical features and purposes of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The accompanying drawings constitute an essential part of the specification and are used together with the embodiments of the present invention to illustrate the technical solution of the present invention, but do not constitute a limitation to the present invention.
[0030] The same reference numerals in the accompanying drawings represent the same components, and the details of each drawing are as follows.
[0031] Figure 1 It is a schematic diagram of the application scenario and topological structure of the extended-range electric vehicle according to an embodiment of the present invention.
[0032] Figure 2 It is a schematic structural diagram of an actuator embodiment of the present invention.
[0033] Figure 3 It is a schematic diagram of test results of a no-fault state and a short power fault according to an embodiment of the present invention.
[0034] Figure 4 Schematic diagram of test results of short-circuit fault and open-circuit fault to ground according to an embodiment of the present invention.
[0035] Figure 5 It is a schematic diagram of the diagnostic process of the method and product embodiment of the present invention.
[0036] Figure 6 The figure is a schematic diagram of a flow chart of an embodiment of the method of the present invention.
[0037] Figure 7 It is a schematic diagram of the structure of the device embodiment of the present invention.
[0038] Figure 8 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 1 .
[0039] Fig. 9 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 2 .
[0040] Fig.10 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 3 .
[0041] The meanings of the various reference signs / numbers are as follows.
[0042] 001-power converter 1; 002-Charger; 003- Transmission system; 004-driving motor; 005-power converter 2; 006-Power battery pack; 007-Range extender; 008-Generator; 009-Engine; 010-minimum interval time; 020-91 low-side drive actuator, that is, low-side drive actuator; 021- the first low level trigger terminal, i.e. the controller drive terminal 1, such as the engine management system EMS (Engine Management System) control terminal 1; 029- Ninth power supply terminal, such as main relay (12V power supply); 030-92 high-side drive actuator, that is, high-side drive actuator; 031-the first high level trigger terminal, i.e. the controller driving terminal 2, such as the EMS control terminal 2; 039- The ninth ground wire terminal, i.e. the ground wire (terminal); 040-No fault test result; 041- driving end voltage 1; 043-test pulse count 1; 050-Driver level short circuit test result to power supply; 051-control terminal voltage 2; 053-test pulse count 2; 060-Driver level short circuit to ground test result; 061- driving end voltage 3; 063-test pulse count 3; 070-Driver level open circuit test results; 071- driving end voltage 4; 073-test pulse count 4; 080-test pulse; 099-9th actuator; 100-first pulse excitation step; 101-the first moment, i.e. the moment when the actuator is powered on; 102-the second moment, i.e. the moment when the actuator starts to act; 111-first pulse sequence; 122-second delay time; 200-Second time-limited diagnostic step; 201- driving terminal, i.e. PIN (corner); 210- impulse response (execution) step; 220-Pulse counting (diagnosis) step; 222 - second voltage sequence; 300-third customized triggering step; 301-the third minimum voltage sequence, namely Vmin-n; 333 - the third count value, i.e. A; 399-the third maximum voltage sequence, i.e. Vmax-n; 400-Fourth information integration step; 600-Self-test device; 610-first pulse excitation unit; 620-Second limited time diagnostic unit; 630-third customized trigger unit; 640-4th information integration unit; 701-first no-fault state; 702-the second power supply is in short circuit state; 703-the third short circuit to ground; 704-fourth open circuit fault state; 801-the first lower limit calibration quantity, i.e. B1; 802- the second lower limit calibration quantity, i.e. B2; 803-the third lower limit calibration quantity, i.e. B3; 804-the fourth lower limit calibration quantity, i.e. B4; 80i-the i-th lower limit calibration quantity, that is, Bi, i is greater than or equal to 2; 891-the first upper limit calibration quantity, i.e. C1; 892- the second upper limit calibration quantity, i.e. C2; 893-the third upper limit calibration quantity, namely C3; 894-the fourth upper limit calibration quantity, namely C4; 89j-jth upper limit calibration quantity, that is, Cj, j is greater than or equal to 2; 900-Vehicles, such as Range Extended Electric Vehicle (REEV) and Plug-in Hybrid Electric Vehicle (PHEV); 901-controller, such as EMS; 903-Computer storage media; 909 - Internal combustion engines, such as gasoline engines; 919-Sensor. DETAILED DESCRIPTION
[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described below are only for explaining the technical solutions of the present invention, rather than for limiting the present invention. In addition, the parts described in the embodiments or the accompanying drawings are only examples of the relevant parts of the present invention, rather than the whole of the present invention.
[0044] like Figure 5 , 6 The circuit fault diagnosis method shown includes a first pulse excitation step 100 and a second time-limited diagnosis step 200; the first pulse excitation step 100 connects the first pulse sequence 111 to the ninth actuator 099 drive terminal 201, the width of the first pulse sequence 111 is less than the second delay time 122, and the second delay time 122 is the minimum interval time 010 between the first moment 101 when the ninth actuator 099 is powered on and the second moment 102 when the ninth actuator 099 starts to perform a preset action and / or perform a preset function; the second time-limited diagnosis step 200 obtains the second voltage sequence 222 of the drive terminal 201, and determines the circuit state of the ninth actuator 099 according to the value characteristics and / or value range of the second voltage sequence 222.
[0045] Among them, Figure 5 , 8 As shown in , 9 and 10, the circuit status includes a first fault-free state 701, a second power short-circuit state 702, a third ground short-circuit state 703, and a fourth open-circuit fault state 704; the ninth actuator 099 is used for driving and / or controlling preset functional components of the internal combustion engine 909 of the vehicle 900; the functional components include at least one of a fuel injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
[0046] like Figure 2 As shown, the ninth actuator 099 includes a ninth low-side driver actuator 020 and / or a ninth high-side driver actuator 030; the ninth low-side driver actuator 020 is connected between the first low-level trigger terminal 021 and the ninth power supply terminal 029, and the ninth high-side driver actuator 030 is connected between the first high-level trigger terminal 031 and the ninth ground terminal 039; the first low-level trigger terminal 021 or the first high-level trigger terminal 031 is electrically connected to the drive terminal 201.
[0047] Among them, if the first pulse sequence 111 does not exist or the first pulse sequence 111 is not transmitting, the first low level trigger terminal 021 is at the same level as the ninth power supply terminal 029 or the first high level trigger terminal 031 is at the same level as the ninth ground terminal 039, then the ninth actuator 099 does not have a driving level failure or the circuit state is normal.
[0048] Furthermore, the circuit fault diagnosis method also provides a third customized trigger step 300; by setting the third count value 333 of the first pulse sequence 111 and obtaining the third minimum voltage sequence 301 and the third maximum voltage sequence 399 of the second voltage sequence 222, the circuit state can be determined according to the value characteristics and / or value range of the third minimum voltage sequence 301 and the third maximum voltage sequence 399.
[0049] Among them, the mth counter Nm can be used to count the third minimum voltage sequence 301 and the third maximum voltage sequence 399. When the accumulated value of the mth counter Nm reaches the third count value 333, the circuit state is in the mth state; m=1, 2, 3 or 4; wherein, m=1 corresponds to the first fault-free state 701, m=2 corresponds to the second power supply short-circuit state 702, m=3 corresponds to the third ground short-circuit state 703, and m=4 corresponds to the fourth open-circuit fault state 704.
[0050] Specifically, if the value of the component of the third minimum voltage sequence 301 is less than the first lower limit calibration value 801 and the value of the component of the third maximum voltage sequence 399 is greater than the first upper limit calibration value 891, the first counter increases by 1; if the first counter reaches the third count value 333, the ninth actuator 099 does not have a drive level fault or the circuit state is normal; if the values of the respective components of the third minimum voltage sequence 301 and the third maximum voltage sequence 399 are between the i-th lower limit calibration value 80i and the j-th upper limit calibration value 891, the m-th counter Nm increases by 1; when the m-th counter reaches the third count value 333, the ninth actuator 099 is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
[0051] Furthermore, the circuit fault diagnosis method also provides a fourth information integration step 400; triggers the first pulse excitation step 100 and / or the second time-limited diagnosis step 200 according to the application scenario of the ninth actuator 099; wherein, the ninth actuator 099 can also be a preset sensor that executes a preset physical quantity detection process, such as a temperature sensor and / or a pressure sensor.
[0052] Among them, the ninth actuator 099 provides intervention action for the internal combustion engine 909 and / or the vehicle 900; the vehicle 900 includes an extended-range vehicle REEV, a plug-in hybrid electric vehicle PHEV, and the starting frequency of the internal combustion engine 909 is less than a preset percentage; otherwise, the execution of its first pulse excitation step 100 and / or the second time-limited diagnosis step 200 may be prohibited.
[0053] Specifically, its value characteristics and / or value range can be determined by comparing the values of the respective components of the third minimum voltage sequence 301 and the third maximum voltage sequence 399 with the preset i-th lower limit calibration value 80i and the preset j-th upper limit calibration value 891, where i is equal to j and is any value of 2, 3 or 4.
[0054] Accordingly, if Figure 7 The system self-test device 600 shown is provided with a first pulse excitation unit 610 and a second time-limited diagnosis unit 620; the first pulse excitation unit 610 is connected to the first pulse sequence 111 to the ninth actuator 099 drive terminal 201, the width of the first pulse sequence 111 is less than the second delay time 122, and the second delay time 122 is the minimum interval time 010 between the first moment 101 when the ninth actuator 099 is powered on and the second moment 102 when the ninth actuator 099 starts to perform a preset action and / or perform a preset function; the second time-limited diagnosis unit 620 obtains the second voltage sequence 222 of the drive terminal 201, and determines the circuit state of the ninth actuator 099 according to the value characteristics and / or value range of the second voltage sequence 222.
[0055] Among them, the circuit state includes at least one of a first fault-free state 701, a second power supply short-circuit state 702, a third ground short-circuit state 703, and a fourth open circuit fault state 704; the ninth actuator 099 is used to drive and / or control preset functional components of the internal combustion engine 909 of the vehicle 900; the functional components include at least one of a fuel injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
[0056] Specifically, Figure 2 As shown, the ninth actuator 099 includes a ninth low-side driver actuator 020 and / or a ninth high-side driver actuator 030; the ninth low-side driver actuator 020 is connected between the first low-level trigger terminal 021 and the ninth power supply terminal 029, and the ninth high-side driver actuator 030 is connected between the first high-level trigger terminal 031 and the ninth ground terminal 039; the first low-level trigger terminal 021 or the first high-level trigger terminal 031 is electrically connected to the drive terminal 201; if the first pulse sequence 111 does not exist or the first pulse sequence 111 is at an interval of transmission, the first low-level trigger terminal 021 and the ninth power supply terminal 029 are at the same level or the first high-level trigger terminal 031 and the ninth ground terminal 039 are at the same level, then the ninth actuator 099 does not have a driver level fault or the circuit state is normal.
[0057] Furthermore, the system self-test device 600 is also provided with a third customized trigger unit 630; and then the third count value 333 of the first pulse sequence 111 is set, and the third minimum voltage sequence 301 and the third maximum voltage sequence 399 of the second voltage sequence 222 are obtained, and the circuit state is determined according to the value characteristics and / or value range of the third minimum voltage sequence 301 and the third maximum voltage sequence 399.
[0058] The mth counter Nm may be used to count the third minimum voltage sequence 301 and the third maximum voltage sequence 399. When the accumulated value of the mth counter Nm reaches the third count value 333, the circuit state is in the mth state; m=1, 2, 3 or 4.
[0059] Specifically, Figure 5 As shown, m=1 corresponds to a first no-fault state 701 , m=2 corresponds to a second short-circuit state 702 to the power supply, m=3 corresponds to a third short-circuit state 703 to the ground, and m=4 corresponds to a fourth open-circuit fault state 704 .
[0060] Among them, if the value of the third minimum voltage sequence 301 component is less than the first lower limit calibration value 801 and the value of the third maximum voltage sequence 399 component is greater than the first upper limit calibration value 891, the first counter increases by 1; if the first counter reaches the third count value 333, the ninth actuator 099 does not have a drive level fault or the circuit state is normal.
[0061] In addition, if the values of the respective components of the third minimum voltage sequence 301 and the third maximum voltage sequence 399 are between the i-th lower limit calibration value 80i and the j-th upper limit calibration value 891, the m-th counter Nm increases by 1; when the m-th counter reaches the third count value 333, the ninth actuator 099 is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
[0062] Furthermore, the system self-test device 600 may also be provided with a fourth information integration unit 640; triggering the first pulse excitation unit 610 and / or the second time-limited diagnosis unit 620 according to the application scenario of the ninth actuator 099; wherein, the ninth actuator 099 may also be a preset sensor for executing a preset physical quantity detection process, and the sensor may be a temperature sensor and / or a pressure sensor.
[0063] Specifically, the ninth actuator 099 can provide intervention actions for the internal combustion engine 909 and / or the vehicle 900; the vehicle 900 can be an extended-range vehicle REEV, a plug-in hybrid electric vehicle PHEV, and the starting frequency of the internal combustion engine 909 is less than a preset percentage; otherwise, the use of the first pulse excitation unit 610 and / or the second time-limited diagnostic unit 620 can be prohibited.
[0064] Among them, the value characteristics and / or value range can be determined by comparing the values of the respective components of the third minimum voltage sequence 301 and the third maximum voltage sequence 399 with the preset i-th lower limit calibration value 80i and the preset j-th upper limit calibration value 891, where i is equal to j and is any value of 2, 3 or 4.
[0065] Similarly, if Fig.10 The computer storage medium 903 and Figure 8 The controller 901 shown adopts the same inventive concept; the computer storage medium 903 includes a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, any of the above circuit fault diagnosis methods can be implemented; the controller 901 includes any of the above fault self-detection devices 600 and / or computer storage media 903, which can achieve the same technical effects.
[0066] In practical applications, the methods and products of the present invention can be applied to a wide range of scenarios; Figure 1 The figure shows a topological structure in the application of extended-range electric vehicle (REEV); it is mainly composed of key components such as range extender 007, power battery pack 006, drive motor 004, etc.; when the power battery pack 006 is fully charged, the range extender 007 does not work, which is equivalent to a pure electric vehicle; when the battery pack 006 is low in charge, the range extender 007 is triggered to start and charge the battery pack 006; at this time, the extended-range electric vehicle (REEV) is similar to a conventional plug-in hybrid electric vehicle (PHEV).
[0067] Specifically, in order to provide users with a better driving experience, current mainstream REEV models are equipped with larger-capacity power battery packs to achieve a longer pure electric range; typically, the pure electric range is over 200 kilometers.
[0068] As the pure electric range increases, most REEV models are used for commuting in the city, with little need for long-distance driving. Basically, they are driven purely on electricity, and the range extender 007 (engine 009) rarely has the opportunity to be started. However, in order to solve the user's mileage anxiety, the range extender 007 is one of the essential core components of the REEV model.
[0069] Based on the above scenario, and considering that the internal combustion engine (such as a gasoline engine) is still one of the best choices for the REEV model range extender 007; whether its components such as injectors and ignition coils can work properly will seriously affect the performance of the engine 009; among them, the engine management system EMS (Engine Management System) diagnoses circuit faults of actuators such as injectors and ignition coils, and the circuit fault diagnosis of actuators is often referred to as "drive-level diagnosis" here.
[0070] like Figure 5As shown, the actuator drive level fault can be divided into three types of faults: open circuit of the drive circuit (i.e., the fourth open circuit fault state 704), short circuit to ground (i.e., the third short circuit to ground state 703), and short circuit to power supply (the second short circuit to power supply state 702); if any of the faults is reported, the relevant actuators cannot work normally; if the injector or ignition coil has the above-mentioned drive level fault, the engine 009 may misfire or even fail to start normally, and cause the range extender 007 to fail to work normally, affecting the performance and safety of the vehicle 900.
[0071] like Figure 2 As shown, the high-side and low-side drive actuators commonly used in current EMS systems can be simplified into a magnetoelectric coil; taking the low-side drive actuator as an example, its positive pole is connected to the ninth power supply terminal 029, i.e., the main relay (12V power supply), and its negative pole is connected to the first low-level trigger terminal 021, i.e., the EMS control PIN angle; when the EMS control PIN angle gives a low level (0V), current flows through the actuator coil and the actuator works; when the EMS control PIN angle gives a high level (12V), no current flows through the actuator coil and the actuator does not work.
[0072] In the related methods, the actuator drive level diagnosis is based on the voltage or current diagnosis of the EMS control PIN angle. For the low-side driven actuator, since the voltage of the EMS control PIN angle is 12V when the actuator is not working and when its control PIN angle is short-circuited with the 12V power supply, the system cannot detect the short power fault of its drive PIN angle when the actuator is not working; similarly, for the high-side driven actuator, the system cannot detect the short ground fault of its drive PIN angle when the actuator is not working; therefore, in the related technology, the EMS actuator drive level diagnosis must rely on the engine running (that is, the actuator is working).
[0073] Taking the REEV model as an example, when vehicle 900 is driven purely electrically for a long time, engine 009 has no chance to start, and the drive-level fault of engine-related components cannot be diagnosed in time; but due to vibration, wiring harness aging and other reasons, there is still a high probability of engine 009 component drive-level fault; at this time, if the system cannot identify this fault in time, it will not be able to remind the user to repair it in time, and will cause engine 009 to run "with disease" for a long time, which poses a great potential risk.
[0074] Specifically, if the above-mentioned fault is not discovered and reminded, once the application scenario (such as long-distance driving) requires the range extender 007 to work and start the engine 009, the above-mentioned fault will be reported during driving; at this time, it is very likely that the range extender 007 cannot work normally; that is to say, although the system reports a fault at this time, the user is already on a long-distance drive, and problems with the range extender 007 at this time will seriously affect the user's travel or cause user complaints.
[0075] However, the relevant technology does not have an effective strategy to identify the component drive-level failure of engine 009 in advance when the range extender 007 is not working; some REEV models have a strategy for regular start-up of the range extender, which can detect the related component drive-level failure when the engine 009 is started, but these strategies require the "unnecessary" start-up of the engine 009, which is wasteful and has the problem of untimely diagnosis.
[0076] The embodiment of the present invention can actively trigger a test pulse to identify the drive-level fault of relevant components in the EMS system in advance. When the engine 009 is not working, the vehicle controller VCU (Vehicle Control Unit) or EMS actively sends a test pulse, and identifies the actuator drive-level fault based on the voltage value fed back by the test pulse.
[0077] Specifically, when the EMS system or VCU is powered on, the system triggers a test pulse to briefly power on the actuator. The duration of the test pulse is less than the minimum pulse width of the actuator and does not trigger the actuator to actually move. Taking the low-side drive actuator as an example, there are the following four scenarios.
[0078] First, when the actuator has no driver fault, the lowest voltage value that the test pulse can reach is 0V. When there is no test pulse, the actuator drive PIN angle voltage value can return to 12V.
[0079] Second, when the actuator has a short power fault (ie, the second power supply is in short circuit state 702), the actuator driving PIN angle voltage value is around 12V before and after the test pulse is sent.
[0080] Third, when the actuator has a short-to-ground fault (ie, the third short-to-ground state 703), the actuator driving PIN angle voltage value is near 0V before and after the test pulse is sent.
[0081] Fourthly, when the actuator has an open circuit fault (ie, the fourth open circuit fault state 704), the actuator driving PIN angle voltage value is a certain value between 0 and 12V before and after the test pulse is sent.
[0082] Specifically, Figure 3 , 4 The test results of the low-side driver actuator without driver-level fault, with driver-level short power supply, short ground, and open circuit fault are given respectively; among them, the timing of sending the test pulse and the way the actuator receives the test pulse can be implemented in the following way.
[0083] According to the working requirements of the range extender 007, the drive-level diagnosis can be triggered before the vehicle 900 is used (i.e., the third customized triggering step 300); and the test process can be triggered according to scenarios such as navigation and refueling, and related diagnosis can also be triggered regularly.
[0084] Among them, when navigation trigger is used, when the distance of the destination input by the user's navigation is greater than the vehicle's pure electric range, the test pulse can be triggered to perform diagnosis of EMS drive-level faults; when refueling trigger is used, the possibility of long-distance driving can be inferred by identifying fuel refueling information, and then the test pulse can be triggered; and periodic triggering can trigger the test pulse at a preset time point or period to complete the diagnosis.
[0085] Furthermore, after the system diagnoses a fault at the driver level of an EMS component, it can also use vehicle instruments, mobile phone text messages, etc. to inform the user that the vehicle has an actuator fault of an engine-related component (i.e., the fourth information integration step 400), inform the user that the related fault may affect long-distance driving safety, and prompt the user to repair the vehicle in time.
[0086] Specifically, drive-level diagnosis can be performed in advance for actuators that have a greater impact on engine starting and stable operation, such as injectors, ignition coils, fuel pump relays, etc.
[0087] Among them, the specific diagnostic strategy includes: after the system is powered on, a range extender drive-level diagnostic requirement is issued according to a preset rule (the third customized trigger step 300); after the EMS / VCU receives the diagnostic requirement, a calibratable number A (third count value 333) of test pulses can be sent to the relevant parts of the engine 009 in a predetermined order; the parts of the engine 009 to be diagnosed execute the test pulses.
[0088] Furthermore, the EMS / VCU system or controller 901 may monitor the minimum voltage value Vmin (the third minimum voltage sequence 301) and the maximum voltage value Vmax (the third maximum voltage sequence 399) of the test pulse. At this time, if: Vmin<calibration value B1, and Vmax>calibration value C1, the counter N1 increases by 1. When N1 = A, the system determines that the actuator has no drive level fault.
[0089] Similarly, if the calibration quantity B2 is less than Vmin and less than the calibration quantity C2, and B2 is less than Vmax and less than the calibration quantity C2, the counter N2 increases by 1, and when N2 = A, the system determines that the actuator has a short power fault; if the calibration quantity B3 is less than Vmin and less than the calibration quantity C3, and B3 is less than Vmax and less than the calibration quantity C3, the counter N3 increases by 1, and when N3 = A, the system determines that the actuator has a short ground fault; if the calibration quantity B4 is less than Vmin and less than the calibration quantity C4, and B4 is less than Vmax and less than the calibration quantity C4, the counter N4 increases by 1, and when N4 = A, the system determines that the actuator has an open circuit fault.
[0090] Furthermore, after the diagnosis of the drive level of the actuator to be diagnosed is completed, if there is no drive level fault, the diagnosis ends; if a drive level fault exists in a certain component, the system will (according to the fourth information integration step 400) issue a prompt message to remind the user to repair the vehicle.
[0091] As mentioned above, the beneficial effects of this embodiment are reflected in: there is no need to add new hardware, and there is no need to start the engine regularly to create test conditions. Only by upgrading the control software process, the driver-level faults of REEV vehicle engine components can be diagnosed in advance; before long-distance driving or other scenarios where the engine needs to be started, the driver-level fault screening can be performed on components with low usage rates such as range extenders; if necessary, the user can be reminded to repair the vehicle before departure to avoid engine breakdown during driving.
[0092] In addition, the products and methods of the present invention are also applicable to plug-in hybrid PHEV models with less frequent engine starts, and can realize early diagnosis of the drive level of its components or complete self-inspection in time according to the vehicle usage scenario; at the same time, its methods and products can also be used for circuit fault diagnosis of engine peripheral components such as pressure and temperature sensors.
[0093] It should be noted that the above embodiments are only for more clearly illustrating the technical solutions of the present invention. Those skilled in the art will understand that the implementation methods of the present invention are not limited to the above contents, and obvious changes, replacements or substitutions based on the above contents do not exceed the scope of the technical solutions of the present invention; other implementation methods will also fall within the scope of the present invention without departing from the concept of the present invention.
Claims
1. A circuit fault diagnosis method, characterized in that The invention comprises a first pulse excitation step (100) and a second time-limited diagnosis step (200); wherein: the first pulse excitation step (100) connects a first pulse sequence (111) to a ninth actuator (099) drive terminal (201) PIN, the width of the first pulse sequence (111) being less than a second delay time (122), the second delay time (122) being the minimum interval time (010) between a first moment (101) when the ninth actuator (099) is powered on and a second moment (102) when the ninth actuator (099) starts to perform a preset action and / or exert a preset function; the second time-limited diagnosis step (200) obtains a second voltage sequence (222) of the drive terminal (201) PIN, and determines the circuit state of the ninth actuator (099) according to the value characteristics and / or value range of the second voltage sequence (222).
2. The circuit fault diagnosis method according to claim 1, wherein: The circuit state comprises at least one of a first no-fault state (701), a second short-circuit state to power supply (702), a third short-circuit state to ground (703), and a fourth open-circuit fault state (704).
3. The circuit fault diagnosis method according to claim 1 or 2, wherein: The ninth actuator (099) is used to drive and / or control a preset functional component of an internal combustion engine (909) of a vehicle (900); the functional component comprises at least one of an injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
4. The circuit fault diagnosis method according to claim 3, wherein: The ninth actuator (099) comprises a ninth low-side drive actuator (020) and / or a ninth high-side drive actuator (030); the ninth low-side drive actuator (020) is bridged between the first low-level trigger terminal (021) and the ninth power supply terminal (029), and the ninth high-side drive actuator (030) is bridged between the first high-level trigger terminal (031) and the ninth ground terminal (039); the first low-level trigger terminal (021) or the first high-level trigger terminal (031) is PIN electrically connected to the drive terminal (201).
5. The circuit fault diagnosis method according to claim 4, wherein: If, when the first pulse sequence (111) does not exist or during the emission interval of the first pulse sequence (111), the first low-level trigger terminal (021) is at the same level as the ninth power supply terminal (029) or the first high-level trigger terminal (031) is at the same level as the ninth ground terminal (039), then the ninth actuator (099) does not have a driver-level fault or the circuit state is normal.
6. The circuit fault diagnosis method according to any one of claims 1, 2, 4 or 5, further comprising a third customized triggering step (300); setting a third count value (333) A of the first pulse sequence (111), and obtaining a third minimum voltage sequence (301) Vmin-n and a third maximum voltage sequence (399) Vmax-n of the second voltage sequence (222), and determining the circuit state according to the value characteristics and / or the value range of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n; the third count value (333) A is a preset positive integer.
7. The circuit fault diagnosis method according to claim 6, wherein: The third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n are counted using an mth counter Nm. When the accumulated value of the mth counter Nm reaches the third count value (333) A, the circuit state is in the mth state; m=1, 2, 3 or 4; m=1 corresponds to the first no-fault state (701), m=2 corresponds to the second power supply short-circuit state (702), m=3 corresponds to the third ground short-circuit state (703), and m=4 corresponds to the fourth open-circuit fault state (704).
8. The circuit fault diagnosis method according to claim 7, wherein: If the value of the component of the third minimum voltage sequence (301) Vmin-n is less than the first lower limit calibration value (801) B1 and the value of the component of the third maximum voltage sequence (399) Vmax-n is greater than the first upper limit calibration value (891) C1, the first counter is incremented by 1; if the first counter reaches the third count value (333) A, there is no drive level fault in the ninth actuator (099) or the circuit state is normal; if the values of the components of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n are between the i-th lower limit calibration value (80i) Bi and the j-th upper limit calibration value (891) Cj, the m-th counter Nm is incremented by 1; when the m-th counter reaches the third count value (333) A, the ninth actuator (099) is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
9. The circuit fault diagnosis method according to any one of claims 4, 5, 7 or 8, further comprising a fourth information integration step (400); triggering the first pulse excitation step (100) and / or the second time-limited diagnosis step (200) according to the application scenario of the ninth actuator (099); wherein, The ninth actuator (099) further comprises a preset sensor for executing a preset physical quantity detection process, wherein the sensor comprises a temperature sensor and / or a pressure sensor.
10. The circuit fault diagnosis method according to claim 9, wherein: The ninth actuator (099) provides an intervention action for the internal combustion engine (909) and / or the vehicle (900); the vehicle (900) includes a range-extended vehicle (REEV) or a plug-in hybrid electric vehicle (PHEV), and the starting frequency of the internal combustion engine (909) is less than a preset percentage; otherwise, the first pulse excitation step (100) and / or the second time-limited diagnosis step (200) are prohibited from being executed.
11. The circuit fault diagnosis method according to any one of claims 4, 5, 7, 8 or 10, wherein: The value characteristic and / or the value range is determined by comparing the values of the respective components of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n with a preset i-th lower limit calibration value (80i) Bi and a preset j-th upper limit calibration value (891) Cj, where i is equal to j and is any value of 2, 3 or 4.
12. A system self-checking device (600), comprising a first pulse excitation unit (610) and a second time-limited diagnosis unit (620); wherein: The first pulse excitation unit (610) connects a first pulse sequence (111) to a ninth actuator (099) drive terminal (201) PIN, the width of the first pulse sequence (111) being less than a second delay time (122), the second delay time (122) being the minimum interval time (010) between a first moment (101) when the ninth actuator (099) is powered on and a second moment (102) when the ninth actuator (099) starts to perform a preset action and / or exert a preset function; the second time-limited diagnosis unit (620) obtains a second voltage sequence (222) of the drive terminal (201) PIN, and determines a circuit state of the ninth actuator (099) according to a value characteristic and / or a value range of the second voltage sequence (222).
13. The system self-checking device (600) according to claim 12, wherein: The circuit state includes at least one of a first fault-free state (701), a second power supply short-circuit state (702), a third ground short-circuit state (703), and a fourth open circuit fault state (704); the ninth actuator (099) is used to drive and / or control a preset functional component of an internal combustion engine (909) of a vehicle (900); the functional component includes at least one of a fuel injection component, an ignition component, a relay component, a temperature sensor, and a pressure sensor.
14. The system self-checking device (600) according to claim 12 or 13, wherein: The ninth actuator (099) comprises a ninth low-side drive actuator (020) and / or a ninth high-side drive actuator (030); the ninth low-side drive actuator (020) is connected between the first low-level trigger terminal (021) and the ninth power supply terminal (029), and the ninth high-side drive actuator (030) is connected between the first high-level trigger terminal (031) and the ninth ground terminal (039); the first low-level trigger terminal (021) or the first high-level trigger terminal (031) is electrically connected to the drive terminal (201) PIN; if, when the first pulse sequence (111) does not exist or when the first pulse sequence (111) is at an interval of transmission, the first low-level trigger terminal (021) and the ninth power supply terminal (029) are at the same level or the first high-level trigger terminal (031) and the ninth ground terminal (039) are at the same level, then the ninth actuator (099) does not have a drive level fault or the circuit state is normal.
15. The system self-test device (600) according to claim 12 or 13, further comprising a third customized trigger unit (630); setting a third count value (333) A of the first pulse sequence (111), and obtaining a third minimum voltage sequence (301) Vmin-n and a third maximum voltage sequence (399) Vmax-n of the second voltage sequence (222), and determining the circuit state according to the value characteristics and / or the value range of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n; the third count value (333) A is a preset positive integer.
16. The system self-checking device (600) according to claim 15, wherein: The third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n are counted using an mth counter Nm. When the accumulated value of the mth counter Nm reaches the third count value (333) A, the circuit state is in the mth state; m=1, 2, 3 or 4; m=1 corresponds to the first no-fault state (701), m=2 corresponds to the second power supply short-circuit state (702), m=3 corresponds to the third ground short-circuit state (703), and m=4 corresponds to the fourth open-circuit fault state (704).
17. The system self-checking device (600) according to claim 16, wherein: If the value of the component of the third minimum voltage sequence (301) Vmin-n is less than the first lower limit calibration value (801) B1 and the value of the component of the third maximum voltage sequence (399) Vmax-n is greater than the first upper limit calibration value (891) C1, the first counter is incremented by 1; if the first counter reaches the third count value (333) A, there is no drive level fault in the ninth actuator (099) or the circuit state is normal; if the values of the components of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n are between the i-th lower limit calibration value (80i) Bi and the j-th upper limit calibration value (891) Cj, the m-th counter Nm is incremented by 1; when the m-th counter reaches the third count value (333) A, the ninth actuator (099) is in the k-th fault state, k=i=j=m, and k is an integer greater than or equal to 2.
18. The system self-checking device (600) according to claim 16 or 17, further comprising a fourth information integration unit (640); triggering the first pulse excitation unit (610) and / or the second time-limited diagnosis unit (620) according to the application scenario of the ninth actuator (099); wherein, The ninth actuator (099) further includes a preset sensor for executing a preset physical quantity detection process, the sensor including a temperature sensor and / or a pressure sensor; wherein: the ninth actuator (099) provides an intervention action for the internal combustion engine (909) and / or the vehicle (900); the vehicle (900) includes a range-extended vehicle (REEV) and a plug-in hybrid electric vehicle (PHEV), and the starting frequency of the internal combustion engine (909) is less than a preset percentage; otherwise, the use of the first pulse excitation unit (610) and / or the second time-limited diagnosis unit (620) is prohibited.
19. The system self-checking device (600) according to claim 18, wherein: The value characteristic and / or the value range is determined by comparing the values of the respective components of the third minimum voltage sequence (301) Vmin-n and the third maximum voltage sequence (399) Vmax-n with a preset i-th lower limit calibration value (80i) Bi and a preset j-th upper limit calibration value (891) Cj, where i is equal to j and is any value of 2, 3 or 4.
20. A computer storage medium (903), comprising a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, the circuit fault diagnosis method according to any one of claims 1 to 11 is implemented.
21. A controller (901), comprising the fault self-checking device (600) according to any one of claims 12 to 18 and / or the computer storage medium (903) according to claim 20.