Vehicle diesel engine electronic control system testability verification analysis method and testability verification process method

Abstract

The invention provides a vehicle diesel engine electronic control system testability verification analysis method and a testability verification process method. The method comprises the following steps: identifying common fault units and fault forms of an electronic control system; designing a testability verification profile of the electric control system; and analyzing injection fault types corresponding to different test profiles of the electronic control system. The vehicle electronic control system testability verification analysis method has the advantages that the vehicle electronic control system testability verification analysis method is innovatively provided, the test profile is designed from the three dimensions of working stress, working state and task scene, the test profile is prevented from being omitted, and the problem that recognition of the diesel engine electronic control system testability verification profile is not comprehensive is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of design and testing of electronic control systems for vehicle diesel engines, and in particular relates to a testability verification analysis method and a testability verification process method for electronic control systems for vehicle diesel engines. Background Art

[0002] Vehicle diesel engine electronic control systems are characterized by numerous components, complex control functions, and highly variable operating conditions. To promptly and accurately detect and locate faults in diesel engine electronic control systems and meet the high safety and reliability requirements of electronic control systems, the importance of testable design and verification of electronic control systems has become increasingly prominent.

[0003] However, at present, there is a relative lack of research on the analysis methods and verification processes for testability verification in the field of vehicle diesel engine electronic control. How to carry out testability verification analysis, how to determine the verification test profile, how to fully simulate fault injection, and how to efficiently design the verification process are difficult problems encountered in the testability verification work of vehicle diesel engine electronic control systems. Summary of the Invention

[0004] In view of this, the present invention aims to provide a testability verification analysis method and a testability verification process method for a vehicle diesel engine electronic control system to solve at least one problem existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] In a first aspect, the present invention provides a method for verifying and analyzing the testability of a vehicle diesel engine electronic control system, comprising the following steps:

[0007] S1. Identify common fault units and fault forms of the electronic control system;

[0008] S2. Design of testability verification profile of electronic control system;

[0009] S3. Analyze the injected fault types corresponding to different test profiles of the electronic control system.

[0010] Further, in step S1, the fault unit includes a temperature sensor unit, a pressure sensor unit, a speed sensor unit, a pedal sensor unit, an injection sensor unit, a PCV valve unit, a pressure relief valve unit, a hard switch unit, a communication module and a power module.

[0011] Furthermore, the temperature sensor unit includes a temperature sensor, a temperature sensor cable, and a temperature sensor conditioning circuit; the pressure sensor unit includes a pressure sensor, a pressure sensor cable, and a pressure sensor conditioning circuit; the speed sensor unit includes a speed sensor, a speed sensor cable, and a speed sensor conditioning circuit; the pedal sensor unit includes a pedal sensor, a pedal sensor cable, and a pedal sensor conditioning circuit; and the fuel injection sensor unit includes an injection solenoid valve, an injection solenoid valve cable, and an injection solenoid valve conditioning circuit.

[0012] Furthermore, the PCV valve unit includes a PCV valve, a PCV valve cable, and a PCV valve drive circuit; the pressure relief valve unit includes a pressure relief valve, a pressure relief valve cable, and a pressure relief valve drive circuit.

[0013] Furthermore, the hard switch unit includes a switch quantity conditioning circuit and a switch quantity cable.

[0014] Furthermore, the communication module includes a communication conditioning circuit and a communication cable; the power module includes a power circuit and a power cable.

[0015] Furthermore, in step S2 and step S3, the electronic control system test profile includes a working condition profile and a mission scenario profile, and the injected fault types corresponding to the working condition profile include sensor unit fault, hard switch unit fault, communication module fault, power module fault, injection solenoid valve unit fault, PCV valve unit fault, and pressure relief valve unit fault;

[0016] The injected fault types corresponding to the mission scenario profile include:

[0017] The output of the coolant temperature sensor unit fluctuates, and the fluctuation value is higher than the protection limit and lower than the fault upper limit;

[0018] The exhaust temperature sensor unit output fluctuates, and the fluctuation value is higher than the protection limit and lower than the fault upper limit;

[0019] The output of the oil pressure sensor unit fluctuates, and the fluctuation value is lower than the alarm limit and higher than the fault lower limit.

[0020] 6. A vehicle diesel engine electronic control system testability verification process method according to claim 5, characterized in that: the sensor unit failure includes temperature sensor unit output exceeding the limit and fluctuating; pressure sensor unit output exceeding the limit and fluctuating; crankshaft speed sensor unit output exceeding the limit and signal fluctuating; cam speed sensor unit output exceeding the limit and signal fluctuating; pedal sensor unit output exceeding the limit and signal fluctuating.

[0021] Furthermore, the hard switch unit failure includes the output exceeding the limit and signal fluctuation of the constant speed 1 switch unit; the output exceeding the limit and signal fluctuation of the constant speed 2 switch unit; and the output exceeding the limit and signal fluctuation of the combat switch unit.

[0022] Furthermore, the communication module failure includes a circuit breaker failure and a signal interference failure; the power module failure includes an over-upper limit failure and an over-lower limit failure.

[0023] Furthermore, the injection solenoid valve unit failure includes a single solenoid valve open circuit, a single solenoid valve short circuit, a short circuit between the common terminal of the injection solenoid valve unit and the ground, and a short circuit between the injection solenoid valve unit and the power supply; the PCV valve unit failure includes open circuit and short circuit; the pressure relief valve unit failure includes open circuit and short circuit.

[0024] In a second aspect, based on the same concept, the present invention also provides a vehicle diesel engine electronic control system testability verification process method, comprising the following steps:

[0025] Step 1: Set the test temperature and voltage value of the environmental test bench according to the working stress profile analysis results;

[0026] Step 2: According to the mission scenario profile analysis results, set the electronic control system of the vehicle under test to operate in the set mission scenario;

[0027] Step 3: According to the results of the working condition profile analysis, the electronic control system of the vehicle under test is set to operate in a set working condition;

[0028] Step 4: Based on the system fault analysis results corresponding to different test profiles of the vehicle electronic control system, simulate the fault injection, and set the injection locations of the same system fault to different structural modules constituting the fault unit in sequence;

[0029] Step 5: Record the recognition of the injected fault by the vehicle electronic control system;

[0030] Step 6: Change the working conditions, mission scenarios, and working stresses to ensure that the verification covers all test profiles.

[0031] Compared with the prior art, the vehicle diesel engine electronic control system testability verification analysis method and testability verification process method described in the present invention have the following advantages:

[0032] (1) The present invention discloses a vehicle diesel engine electronic control system testability verification analysis method and a testability verification process method. The present invention innovatively proposes a vehicle diesel engine electronic control system testability verification analysis method, and proposes designing test profiles from three dimensions: working stress, working status, and task scenario, to avoid missing test profiles and solve the problem of incomplete identification of diesel engine electronic control system testability verification profiles.

[0033] (2) The testability verification analysis method and testability verification process method of a vehicle diesel engine electronic control system described in the present invention innovatively propose to associate the vehicle electronic control system test profile with the type of injection fault during testing, comprehensively analyze the corresponding injection system faults under different test profiles, and eliminate the hidden dangers of missing items in simulating injection system faults when conducting testability verification.

[0034] (3) The testability verification analysis method and testability verification process method of a vehicle diesel engine electronic control system described in the present invention innovatively construct a vehicle electronic control system testability verification process, provide guidance for the implementation of testability verification work, and have been successfully applied to the testability verification of a certain type of vehicle diesel engine electronic control system. This project can be promoted and applied to the testability test verification of other types of diesel engine electronic control systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of the test verification process described in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0041] like Figure 1 As shown, a vehicle diesel engine electronic control system testability verification analysis method specifically includes the following steps:

[0042] S1: Identify common fault units and fault forms of the electronic control system;

[0043] S2: Design of testability verification profile of electronic control system;

[0044] S3: Analyze the injected fault types corresponding to different test profiles of the electronic control system.

[0045] In a preferred embodiment of the present invention, in step S1, the fault unit includes a temperature sensor unit, a pressure sensor unit, a speed sensor unit, a pedal sensor unit, an injection sensor unit, a PCV valve unit, a pressure relief valve unit, a hard switch unit, a communication module and a power supply module; the temperature sensor unit includes a temperature sensor, a temperature sensor cable and a temperature sensor conditioning circuit; the pressure sensor unit includes a pressure sensor, a pressure sensor cable and a pressure sensor conditioning circuit; the speed sensor unit includes a speed sensor, a speed sensor cable and a speed sensor conditioning circuit; the pedal sensor unit includes a pedal sensor, a pedal sensor cable and a pedal sensor conditioning circuit; the injection sensor unit includes an injection solenoid valve, an injection solenoid valve cable and an injection solenoid valve conditioning circuit; the PCV valve unit includes a PCV valve, a PCV valve cable and a PCV valve drive circuit; the pressure relief valve unit includes a pressure relief valve, a pressure relief valve cable and a pressure relief valve drive circuit; the hard switch unit includes a switch quantity conditioning circuit and a switch quantity cable; the communication module includes a communication conditioning circuit and a communication cable; and the power supply module includes a power supply circuit and a power cable.

[0046] Common fault units and fault modes of the electronic control system are shown in Table 1.

[0047] Table 1 Common fault units and components of electronic control system

[0048] .

[0049] In a preferred embodiment of the present invention, the factors affecting the testability verification of the electronic control system and the test profiles include: an operating stress profile, an operating state profile, and a mission scenario profile. The operating stress profile includes electrical stress and thermal stress. The operating state profile analysis includes power-on conditions, shutdown conditions, and operating conditions. The mission scenario profile analysis includes normal mission scenarios and emergency mission scenarios.

[0050] In a preferred embodiment of the present invention, in step S2 and step S3, the electronic control system test profile includes an operating state profile and a mission scenario profile, and the injected fault types corresponding to the operating state profile include sensor unit fault, hard switch unit fault, communication module fault, power module fault, injection solenoid valve unit fault, PCV valve unit fault, and pressure relief valve unit fault;

[0051] Among them, sensor unit failures include temperature sensor unit output exceeding limit and fluctuation; pressure sensor unit output exceeding limit and fluctuation; crankshaft speed sensor unit output exceeding limit and signal fluctuation; cam speed sensor unit output exceeding limit and signal fluctuation; pedal sensor unit output exceeding limit and signal fluctuation; hard switch unit failures include constant speed 1 switch unit output exceeding limit and signal fluctuation; constant speed 2 switch unit output exceeding limit and signal fluctuation; combat switch unit output exceeding limit and signal fluctuation; communication module failures include open circuit failure and signal interference failure; power supply module failures include over-upper limit failure and over-lower limit failure; injection solenoid valve unit failures include single solenoid valve open circuit, single solenoid valve short circuit, injection solenoid valve unit common terminal short circuit to ground, injection solenoid valve unit short circuit to power supply; PCV valve unit failures include open circuit and short circuit; pressure relief valve unit failures include open circuit and short circuit.

[0052] In a preferred embodiment of the present invention, the injected fault types corresponding to the mission scenario profile include coolant temperature sensor unit output fluctuation, with the fluctuation value exceeding the protection limit and below the upper fault limit; exhaust temperature sensor unit output fluctuation, with the fluctuation value exceeding the protection limit and below the upper fault limit; and oil pressure sensor unit output fluctuation, with the fluctuation value below the alarm limit and above the lower fault limit. The injected fault types corresponding to the working state profile are shown in Table 2; the injected fault types corresponding to the mission scenario profile are shown in Table 3.

[0053] Table 2 Injection fault types under different operating conditions test profiles

[0054] .

[0055] Table 3. Injection fault types under different task scenario test profiles

[0056] .

[0057] The present invention innovatively proposes a vehicle electronic control system testability verification analysis method, and proposes designing test profiles from three dimensions: working stress, working status, and mission scenarios, to avoid missing test profiles and solve the problem of incomplete identification of testability verification profiles for diesel engine electronic control systems.

[0058] The present invention innovatively proposes to associate the vehicle electronic control system test profile with the type of fault injected during the test, comprehensively analyze the corresponding injection system faults under different test profiles, and eliminate the hidden dangers of missing simulated injection system faults when conducting test verification.

[0059] A vehicle diesel engine electronic control system testability verification process method is designed based on the above testability verification analysis method. The process steps are as follows:

[0060] Step 1: According to the working stress profile analysis results, set the environmental test bench test temperature and voltage values;

[0061] Step 2: According to the mission scenario profile analysis results, set the electronic control system of the vehicle under test to operate in the set mission scenario;

[0062] Step 3: According to the results of the working condition profile analysis, set the electronic control system of the vehicle under test to operate in the set working condition;

[0063] Step 4: Based on the system fault analysis results corresponding to different test profiles of the vehicle electronic control system, simulate the fault injection. The injection locations of the same system fault are sequentially set to different structural modules that constitute the fault unit;

[0064] Step 5: Record the vehicle electronic control system's recognition of the injected fault;

[0065] Step 6: Change the working conditions, mission scenarios, and working stresses to ensure that the verification covers all test profiles.

[0066] The test verification flow chart is as follows Figure 1 As shown in Table 4, the fault identification record table is shown in Table 4.

[0067] Table 4 Fault identification record

[0068] .

[0069] This invention innovatively constructs a vehicle electronic control system test and verification process to provide guidance for the implementation of test and verification work, and has been successfully applied to the test and verification of a certain type of vehicle diesel engine electronic control system. This project can be extended to the test and verification of other types of diesel engine electronic control systems.

[0070] The present invention is used to comprehensively identify the working environment conditions, working status and mission scenario profiles of the vehicle electronic control system, avoid missing test profiles, and solve the problem of incomplete identification of the testability verification profile of the diesel engine electronic control system; at the same time, according to the in-machine test mode and operation logic of the diesel engine electronic control system, multiple fault types and detection opportunities are identified and reasonably sorted, and then a comprehensive and reasonable testability verification process is proposed, which provides scientific guidance for the implementation of the testability verification work of the diesel engine electronic control system and provides a reliable basis for testability design decisions.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vehicle diesel engine electronic control system testability verification and analysis method, characterized by: The following steps are involved: S1. Identify common fault units and fault forms of the electronic control system; S2. Design of testability verification profile of electronic control system; S3. Analyze the injected fault types corresponding to different test profiles of the electronic control system.

2. The vehicle diesel engine electronic control system testability verification and analysis method according to claim 1, characterized in that: In step S1 , the faulty units include a temperature sensor unit, a pressure sensor unit, a speed sensor unit, a pedal sensor unit, an injection sensor unit, a PCV valve unit, a pressure relief valve unit, a hard switch unit, a communication module, and a power module.

3. The vehicle diesel engine electronic control system testability verification and analysis method according to claim 2, characterized in that: The temperature sensor unit includes a temperature sensor, a temperature sensor cable, and a temperature sensor conditioning circuit; the pressure sensor unit includes a pressure sensor, a pressure sensor cable, and a pressure sensor conditioning circuit; the speed sensor unit includes a speed sensor, a speed sensor cable, and a speed sensor conditioning circuit; the pedal sensor unit includes a pedal sensor, a pedal sensor cable, and a pedal sensor conditioning circuit; the fuel injection sensor unit includes an injection solenoid valve, an injection solenoid valve cable, and an injection solenoid valve conditioning circuit.

4. The vehicle diesel engine electronic control system testability verification and analysis method according to claim 2, characterized in that: The PCV valve unit includes a PCV valve, a PCV valve cable, and a PCV valve drive circuit; the pressure relief valve unit includes a pressure relief valve, a pressure relief valve cable, and a pressure relief valve drive circuit; the hard switch unit includes a switch quantity conditioning circuit and a switch quantity cable; the communication module includes a communication conditioning circuit and a communication cable; and the power supply module includes a power supply circuit and a power supply cable.

5. The vehicle diesel engine electronic control system testability verification and analysis method according to claim 2, characterized in that: In steps S2 and S3, the electronic control system test profile includes an operating state profile and a mission scenario profile. The fault types injected into the operating state profile include sensor unit fault, hard switch unit fault, communication module fault, power module fault, injection solenoid valve unit fault, PCV valve unit fault, and pressure relief valve unit fault. The injected fault types corresponding to the mission scenario profile include: The output of the coolant temperature sensor unit fluctuates, and the fluctuation value is higher than the protection limit and lower than the fault upper limit; The exhaust temperature sensor unit output fluctuates, and the fluctuation value is higher than the protection limit and lower than the fault upper limit; The output of the oil pressure sensor unit fluctuates, and the fluctuation value is lower than the alarm limit and higher than the fault lower limit.

6. A vehicle diesel engine electronic control system testability verification process method according to claim 5, characterized in that: The sensor unit failure includes temperature sensor unit output exceeding the limit and fluctuating; pressure sensor unit output exceeding the limit and fluctuating; crankshaft speed sensor unit output exceeding the limit and signal fluctuating; cam speed sensor unit output exceeding the limit and signal fluctuating; pedal sensor unit output exceeding the limit and signal fluctuating.

7. The vehicle diesel engine electronic control system testability verification process method according to claim 5, characterized in that: The hard switch unit failure includes the output exceeding the limit and signal fluctuation of the constant speed 1 switch unit; the output exceeding the limit and signal fluctuation of the constant speed 2 switch unit; and the output exceeding the limit and signal fluctuation of the combat switch unit.

8. The vehicle diesel engine electronic control system testability verification process method according to claim 5, characterized in that: The communication module failure includes a circuit breaker failure and a signal interference failure; the power module failure includes an upper limit exceeding failure and a lower limit exceeding failure.

9. The vehicle diesel engine electronic control system testability verification process method according to claim 5, characterized in that: The injection solenoid valve unit failure includes single solenoid valve open circuit, single solenoid valve short circuit, injection solenoid valve unit common terminal short circuit to ground, injection solenoid valve unit short circuit to power supply; PCV valve unit failure includes open circuit and short circuit; pressure relief valve unit failure includes open circuit and short circuit.

10. A vehicle diesel engine electronic control system testability verification and analysis method, characterized by: The following steps are involved: Step 1: Set the test temperature and voltage value of the environmental test bench according to the working stress profile analysis results; Step 2: According to the mission scenario profile analysis results, set the electronic control system of the vehicle under test to operate in the set mission scenario; Step 3: According to the results of the working condition profile analysis, the electronic control system of the vehicle under test is set to operate in a set working condition; Step 4: Based on the system fault analysis results corresponding to different test profiles of the vehicle electronic control system, simulate the fault injection, and set the injection locations of the same system fault to different structural modules constituting the fault unit in sequence; Step 5: Record the recognition of the injected fault by the vehicle electronic control system; Step 6: Change the working conditions, mission scenarios, and working stresses to ensure that the verification covers all test profiles.

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