Fault diagnosis and treatment method for working reasonability of oil supply system of special hybrid transmission

Abstract

The invention discloses a working rationality fault diagnosis and processing method for an oil supply system of a special hybrid transmission, and belongs to the field of special hybrid transmissions. The method is realized based on three modules, the three modules are respectively a signal input module, a fault diagnosis module and a fault post-processing module, input signals of a transmission oil supply system are gathered and processed by utilizing the signal input module, and a processing result is output to the fault diagnosis module; the fault diagnosis module is used for performing fault diagnosis on the reasonability of the working state of the transmission oil supply system signal output by the signal input module, and inputting an obtained characteristic value to the fault post-processing module; and after a reasonable fault of the working state of the oil supply system is diagnosed by using a fault post-processing module, limp post-processing is carried out, and a fault lamp is lightened. According to the invention, the rationality of the working state of the oil supply system can be detected and diagnosed more accurately, the risk of missed judgment and misjudged diagnosis of the system is reduced, and effective post-processing can be carried out.

Description

Technical Field

[0001] The present invention belongs to the field of hybrid power transmissions, and in particular relates to a method for diagnosing and processing faults of an operating rationality of an oil supply system of a hybrid power transmission. Background Art

[0002] Hybrid transmissions utilize different clutch combinations to establish gears during operation. The reliability of the gear engagement and shifting process is closely related to the operating state of the fuel supply system. Hybrid transmissions typically feature two oil pumps: a mechanical and an electronic pump, arranged in parallel. The transmission control unit (TCU) determines the timing and operating state of the mechanical and electronic pumps based on the vehicle's operational requirements. Due to cost considerations and other factors, hybrid transmissions typically lack sensors for detecting flow and pressure in the fuel supply system. This prevents the TCU from accurately detecting and diagnosing the rationality of the fuel supply system's operating state, such as leaks or oil line blockages.

[0003] In summary, the existing technology is currently unable to accurately diagnose and process the rationality of the working state of the oil supply system. Therefore, it is urgent to invent a method for diagnosing and processing the rationality failure of the oil supply system. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the background technology and to provide a method for diagnosing and handling the rationality of the operation fault of the hybrid transmission oil supply system.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A method for diagnosing and handling faults related to the rationality of the operation of a hybrid transmission oil supply system is disclosed. The method is implemented based on three modules: a signal input module, a fault diagnosis module, and a fault post-processing module. The signal input module, the fault diagnosis module, and the fault post-processing module are sequentially connected in signal connection. The output end of the transmission oil supply system is signal-connected to the input end of the signal input module. The method includes the following steps: Step 1: Use the signal input module to aggregate and process the transmission oil supply system input signal, and output the processing results to the fault diagnosis module; Step 2: Use the fault diagnosis module to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, and input the obtained characteristic value to the fault post-processing module; Step 3: Use the fault post-processing module to diagnose the rationality fault of the fuel supply system working state, perform limp home post-processing and light the fault light.

[0006] Furthermore, in step 1, the transmission oil supply system input signal includes the electronic oil pump current, the electronic oil pump voltage, the actual speed of the electronic oil pump, the altitude factor, the engine speed, the main oil pressure solenoid valve feedback current and the transmission oil temperature; wherein the electronic oil pump current, the electronic oil pump voltage, the actual speed of the electronic oil pump, the altitude factor, and the engine speed are input by CAN bus signals; the main oil pressure solenoid valve feedback current and the transmission oil temperature are derived from the TCU controller sensor signal acquisition data of the transmission oil supply system; Furthermore, in step 1, the processing of the transmission oil supply system input signal is specifically as follows: 1) Main oil pressure characteristic calibration MAP The main oil pressure characteristic calibrated MAP is obtained based on the main oil pressure solenoid valve feedback current and the transmission oil temperature, and the virtual main oil pressure value is obtained through testing; 2) Real-time electric power calculation of electronic oil pump Electronic oil pump voltage × electronic oil pump current = electronic oil pump real-time electrical power.

[0007] Furthermore, in step 2, the fault diagnosis module is used to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, specifically: 1) Electronic oil pump power characteristics MAP The MAP calibration of the electronic oil pump power characteristic is achieved based on the basic performance test results of multiple electronic oil pump power test benches. The calibration data is selected to have median representativeness. That is, the MAP calibration of the electronic oil pump power characteristic is determined by selecting the median value based on the data of virtual main oil pressure, actual speed of the electronic oil pump, and transmission oil temperature. 2) Actual vehicle calibration MAP The MAP calibration for the actual vehicle is based on data collected from the actual vehicle, taking into account the differences between the actual vehicle layout and usage scenarios and the single test bench; Specifically: MAP is calibrated based on the actual speed of the electronic pump, the transmission oil temperature, and the engine speed; The electronic oil pump power characteristic MAP × actual vehicle corrected calibration MAP = actual vehicle basic power calibration value. The final selection of calibration data is required to be representative of the median value. 3) Reasonable diagnosis of upper and lower limit calibration MAP The upper limit calibration MAP and the lower limit calibration MAP of the rationality diagnosis are both obtained by comprehensively considering the altitude factor and the transmission oil temperature; The calculation formula of the rational diagnosis upper limit calibration MAP is: The upper limit calibration MAP of the rationality diagnosis + the actual vehicle basic power calibration value = the upper limit power value; the upper limit power value is defined as condition 1; The calculation formula of the reasonable diagnostic lower limit calibration MAP is: Reasonable diagnosis lower limit calibration MAP - actual vehicle basic power calibration value = lower limit power value; define the lower limit power value as condition 2; 4) Calculation results of the fault diagnosis module When the electronic oil pump real-time electric power is ≥ condition 1, or when the electronic oil pump real-time electric power is ≤ condition 2, it is considered an unqualified result. When the electronic oil pump real-time electric power is ≤ condition 1 and the electronic oil pump real-time electric power is ≥ condition 2, it is a qualified result.

[0008] Furthermore, in step 3, when condition 1 or condition 2 is met and lasts for a certain period of time t1, the fuel supply system working state rationality fault 1 is reported, that is, the system has a tendency to be blocked; or rationality fault 2, that is, the system has a tendency to leak; the transmission enters the limp state, and the TCU requests to light up the fault light and limit the speed; after three complete driving cycles, if it is not restored, the N gear is forced; a complete driving cycle means that the driver completes the following operations: powering on the vehicle, driving the vehicle, and powering off the vehicle.

[0009] Compared with the prior art, the present invention has the following beneficial effects: If the transmission oil supply system leaks or becomes clogged, it can lead to insufficient oil supply and delayed response. The adverse effects include: mild vehicle jerking, resulting in a poor driving experience; severe damage to the transmission hardware.

[0010] The present invention can perform relatively accurate detection and diagnosis of the rationality of the working status of the oil supply system, reduce the risk of missed or misdiagnosed diagnosis by the system, and perform effective post-processing, thereby achieving a good driving experience and effective protection of the gearbox hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a flow chart of a method for diagnosing and handling faults of a hybrid transmission oil supply system operating rationality according to the present invention; Figure 2 is a schematic diagram of a signal input module of the present invention; Figure 3 is a schematic diagram of a fault diagnosis module of the present invention; Figure 4 It is a diagram of the upper and lower power value ranges of the present invention. DETAILED DESCRIPTION

[0012] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] Specific implementation method 1: Figures 1-4 As shown, this embodiment describes a method for diagnosing and processing faults of the hybrid transmission oil supply system operating rationality. The method is implemented based on three modules, namely a signal input module, a fault diagnosis module, and a fault post-processing module. The signal input module, the fault diagnosis module, and the fault post-processing module are sequentially connected in signal connection. The output end of the transmission oil supply system is signal-connected to the input end of the signal input module. The method includes the following steps: Step 1: Use the signal input module to aggregate and process the transmission oil supply system input signal, and output the processing results to the fault diagnosis module; Step 2: Use the fault diagnosis module to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, and input the obtained characteristic value to the fault post-processing module; Step 3: Use the fault post-processing module to diagnose the rationality fault of the fuel supply system working state, perform limp home post-processing and light the fault light.

[0014] Specific implementation method 2: Figure 1-Figure 3 As shown, this embodiment is a further explanation of the specific embodiment 1. In step 1, the transmission oil supply system input signal includes the electronic oil pump current, the electronic oil pump voltage, the actual electronic oil pump speed, the altitude factor, the engine speed (mechanical oil pump speed), the main oil pressure solenoid valve feedback current and the transmission oil temperature; wherein, the electronic oil pump current, the electronic oil pump voltage, the actual electronic oil pump speed, the altitude factor, and the engine speed (mechanical oil pump speed) are input via CAN bus signals; the main oil pressure solenoid valve feedback current and the transmission oil temperature are derived from the TCU controller sensor signal acquisition data of the transmission oil supply system; Specific implementation method three: Figure 1-Figure 3 As shown, this embodiment is a further explanation of the specific embodiment 2. In step 1, the input signal of the transmission oil supply system is processed as follows: 1) Main oil pressure characteristic calibration MAP The main oil pressure characteristic calibrated MAP is obtained based on the main oil pressure solenoid valve feedback current and the transmission oil temperature. After testing (checking the electronic oil pump characteristic power MAP value table, which is a MAP table developed based on the basic characteristics of the electronic oil pump after testing and presented in the controller software strategy), the virtual main oil pressure value is obtained; 2) Real-time electric power calculation of electronic oil pump Electronic oil pump voltage × electronic oil pump current = electronic oil pump real-time electrical power.

[0015] Specific implementation method four: Figures 1-4 As shown, this embodiment is a further explanation of the specific embodiment 1. In step 2, the fault diagnosis module is used to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, specifically: 1) Electronic oil pump power characteristics MAP The MAP calibration of the electronic oil pump power characteristic is achieved based on the basic performance test results of multiple electronic oil pump power test benches. The calibration data is selected to have median representativeness. That is, the MAP calibration of the electronic oil pump power characteristic is determined by selecting the median value based on the data of virtual main oil pressure, actual speed of the electronic oil pump, and transmission oil temperature. 2) Actual vehicle calibration MAP The MAP calibration for the actual vehicle is based on data collected from the actual vehicle, taking into account the differences between the actual vehicle layout and usage scenarios and the single test bench; Specifically: MAP is calibrated based on actual vehicle test according to the actual speed of the electronic pump, the transmission oil temperature and the engine speed (i.e. the speed of the mechanical oil pump); The electronic oil pump power characteristic MAP × actual vehicle corrected calibration MAP = actual vehicle basic power calibration value. The final selection of calibration data is required to be representative of the median value. The data collected from real vehicles should be extensive, including multiple (hundreds) test vehicles in good condition, and tested in high temperature, low temperature, plateau and other usage scenarios. The calibration MAP is calculated and fitted based on the extensive collected data. The specific algorithm is as follows: Figure 3 As shown, the final selection of calibration data requires median representativeness; 3) Reasonable diagnosis of upper and lower limit calibration MAP The upper limit calibration MAP and the lower limit calibration MAP of the rationality diagnosis are both obtained by comprehensively considering the altitude factor and the transmission oil temperature; The calculation formula of the rational diagnosis upper limit calibration MAP is: The upper limit calibration MAP of the rationality diagnosis + the actual vehicle basic power calibration value = the upper limit power value; the upper limit power value is defined as condition 1; The calculation formula of the reasonable diagnostic lower limit calibration MAP is: Reasonable diagnosis lower limit calibration MAP - actual vehicle basic power calibration value = lower limit power value; define the lower limit power value as condition 2; The calibration of the MAP is mainly based on: the transmission assembly with the upper and lower deviation limits of the "leakage amount" of the assembled parts is respectively equipped on different test vehicles to collect data from the road durability test vehicle. It should include multiple road durability test vehicles, and test data collection should be carried out in high temperature, low temperature, plateau and other usage scenarios.

[0016] The rationality diagnosis lower limit MAP calibration is based on the test data collection of the test vehicle equipped with the "leakage upper limit deviation (initial leakage is large and within the design range)" gearbox after the vehicle durability and normal gearbox maintenance. The specific algorithm is as follows Figure 3 As shown, the rationality diagnosis lower limit calibration MAP-actual vehicle basic power calibration value = lower limit power value; The rationality diagnosis upper limit MAP calibration is based on the data collected during the entire durability test of the test vehicle equipped with a transmission with a "lower limit deviation of leakage (initial leakage is small and within the design range)". The specific algorithm is as follows: Figure 3 As shown, the rationality diagnosis upper limit calibration MAP + actual vehicle basic power calibration value = upper limit power value.

[0017] 4) Calculation results of the fault diagnosis module like Figure 3 、 Figure 4 As shown, when the electronic oil pump real-time electric power ≥ condition 1, or when the electronic oil pump real-time electric power ≤ condition 2, it is considered an unqualified result. When the electronic oil pump real-time electric power ≤ condition 1 and the electronic oil pump real-time electric power ≥ condition 2, it is a qualified result.

[0018] Specific implementation method five: Figures 1-4 As shown, this embodiment is a further explanation of the specific embodiment four. In step 3, when condition 1 or condition 2 is met and lasts for a certain time t1 (t1 is recommended to be 2s), the fuel supply system working state rationality fault 1, that is, the system has a tendency to be blocked; or rationality fault 2, that is, the system has a tendency to leak, is reported; the transmission enters the limp state, and the TCU requests to light up the fault light and limit the speed; after three complete driving cycles, if it has not recovered, the N gear is forced; a complete driving cycle means that the driver completes the following operations: powering on the vehicle, driving the vehicle, and powering off the vehicle.

[0019] Example: For a vehicle equipped with a hybrid-powered transmission according to the present invention, after the system is READY, depending on the vehicle's operating mode (pure electric, hybrid), the transmission oil supply system usually operates in one of the following three states: 1) the electronic oil pump supplies oil alone; 2) the electronic oil pump and the mechanical oil pump supply oil simultaneously; 3) the mechanical oil pump supplies oil alone.

[0020] The characteristic power MAP value of the electronic oil pump is shown in Table 1; Table 1: The actual vehicle corrected MAP value is shown in Table 2; Table 2: It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other configurations without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations coming within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0021] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for diagnosing and handling faults in the operation rationality of a hybrid transmission oil supply system, characterized by: The method is implemented based on three modules, namely a signal input module, a fault diagnosis module, and a fault post-processing module. The signal input module, the fault diagnosis module, and the fault post-processing module are sequentially connected in signal connection. The output end of the transmission oil supply system is signal-connected to the input end of the signal input module. The method includes the following steps: Step 1: Use the signal input module to aggregate and process the transmission oil supply system input signal, and output the processing results to the fault diagnosis module; Step 2: Use the fault diagnosis module to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, and input the obtained characteristic value to the fault post-processing module; Step 3: Use the fault post-processing module to diagnose the rationality fault of the fuel supply system working state, perform limp home post-processing and light the fault light.

2. The hybrid transmission oil supply system operation rationality fault diagnosis and treatment method according to claim 1 is characterized by: In step 1, the transmission oil supply system input signals include electronic oil pump current, electronic oil pump voltage, actual electronic oil pump speed, altitude factor, engine speed, main oil pressure solenoid valve feedback current and transmission oil temperature; wherein, the electronic oil pump current, electronic oil pump voltage, actual electronic oil pump speed, altitude factor and engine speed are input by CAN bus signals; the main oil pressure solenoid valve feedback current and transmission oil temperature are derived from TCU controller sensor signal acquisition data of the transmission oil supply system.

3. The hybrid transmission oil supply system operation rationality fault diagnosis and treatment method according to claim 2 is characterized by: In step 1, the transmission oil supply system input signal is processed, specifically: 1) Main oil pressure characteristic calibration MAP The main oil pressure characteristic calibrated MAP is obtained based on the main oil pressure solenoid valve feedback current and the transmission oil temperature, and the virtual main oil pressure value is obtained through testing; 2) Real-time electric power calculation of electronic oil pump Electronic oil pump voltage × electronic oil pump current = electronic oil pump real-time electrical power.

4. The hybrid transmission oil supply system operation rationality fault diagnosis and treatment method according to claim 1 is characterized by: In step 2, the fault diagnosis module is used to perform fault diagnosis on the rationality of the working state of the transmission oil supply system signal output by the signal input module, specifically: 1) Electronic oil pump power characteristics MAP The MAP calibration of the electronic oil pump power characteristic is achieved based on the basic performance test results of multiple electronic oil pump power test benches. The calibration data is selected to have median representativeness. That is, the MAP calibration of the electronic oil pump power characteristic is determined by selecting the median value based on the data of virtual main oil pressure, actual speed of the electronic oil pump, and transmission oil temperature. 2) Actual vehicle calibration MAP The MAP calibration for the actual vehicle is based on data collected from the actual vehicle, taking into account the differences between the actual vehicle layout and usage scenarios and the single test bench; Specifically: MAP is calibrated based on the actual speed of the electronic pump, the transmission oil temperature, and the engine speed; The electronic oil pump power characteristic MAP × actual vehicle corrected calibration MAP = actual vehicle basic power calibration value. The final selection of calibration data is required to be representative of the median value. 3) Reasonable diagnosis of upper and lower limit calibration MAP The upper limit calibration MAP and the lower limit calibration MAP of the rationality diagnosis are both obtained by comprehensively considering the altitude factor and the transmission oil temperature; The calculation formula of the rational diagnosis upper limit calibration MAP is: The upper limit calibration MAP of the rationality diagnosis + the actual vehicle basic power calibration value = the upper limit power value; the upper limit power value is defined as condition 1; The calculation formula of the reasonable diagnostic lower limit calibration MAP is: Reasonable diagnosis lower limit calibration MAP - actual vehicle basic power calibration value = lower limit power value; define the lower limit power value as condition 2; 4) Calculation results of the fault diagnosis module When the real-time electric power of the electronic oil pump is ≥ condition 1, or when the real-time electric power of the electronic oil pump is ≤ condition 2, it is considered an unqualified result; The result is qualified when the real-time power of the electronic oil pump is ≤ condition 1 and the real-time electric power of the electronic oil pump is ≥ condition 2.

5. The hybrid transmission oil supply system operation rationality fault diagnosis and treatment method according to claim 4 is characterized by: In step 3, when condition 1 or condition 2 is met and lasts for a certain period of time t1, the fuel supply system working state rationality fault 1 is reported, that is, the system has a tendency to be blocked; or rationality fault 2, that is, the system has a tendency to leak; the transmission enters the limp state, and the TCU requests to light up the fault light and limit the speed; after three complete driving cycles, if it is not restored, the N gear is forced; a complete driving cycle means that the driver completes the following operations: powering on the vehicle, driving the vehicle, and powering off the vehicle.

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