Engine oil pressure alarm diagnosis method, device and equipment and storage medium

Abstract

The invention discloses an engine oil pressure alarm diagnosis method, device and equipment and a storage medium, and relates to the technical field of vehicle fault diagnosis. The engine oil pressure alarm diagnosis method comprises the steps that real-time oil pressure and target oil pressure of an engine lubricating system are obtained; whether the oil pressure difference value between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold value or not is judged; when the oil pressure difference value exceeds a preset alarm threshold value, whether the real-time oil pressure is larger than target oil pressure or not is judged, and when the real-time oil pressure is larger than the target oil pressure, the electric control valve is controlled to be opened and closed; and real-time oil pressure during opening and closing of the electric control valve is collected, and when the difference value of the real-time oil pressure before and after opening and closing of the electric control valve does not exceed a preset oil pressure threshold value, engine oil pressure alarming is conducted. Through the real-time oil pressure and the target oil pressure of the engine lubricating system, the engine oil pressure of the engine is diagnosed preliminarily, meanwhile, control is conducted through the electric control valve arranged at the tail end of the oil way, it is determined that the fault is actually the oil pressure abnormity of the engine lubricating system, and the driving experience of a vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle fault diagnosis, and in particular to an oil pressure alarm diagnosis method, device, equipment and storage medium. Background Art

[0002] The engine lubrication system is designed to ensure that the oil pressure of each oil-using component and each oil circuit of the engine meets the design requirements under various extreme working conditions. If the oil pressure is too high, it will cause oil leakage in the oil filter and other locations. If the oil pressure is too low, it will cause damage to the main bearing and other oil-using components, and eventually cause damage to the engine. Therefore, in order to ensure the normal operation of the engine lubrication system, an oil pressure alarm system is generally set up.

[0003] The existing technical solution generally installs an oil pressure sensor in the main oil channel of the engine. The pressure sensor can measure the oil pressure of the main oil channel. When the measured oil pressure exceeds the specified threshold, it is determined that an oil pressure fault has occurred. However, when the oil circuit behind the oil pressure sensor fails (for example, when the VVT ​​at the end of the oil circuit, the high-pressure oil pump, the camshaft oil circuit, etc. is blocked or leaking), the oil pressure sensor may not be able to feedback the oil circuit fault and will not issue an oil pressure alarm, which may cause engine damage.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide an oil pressure alarm diagnostic method, device, equipment and storage medium, aiming to solve the technical problem in the prior art that the oil pressure sensor cannot accurately feedback the oil circuit fault, resulting in inaccurate engine oil pressure diagnosis.

[0006] To achieve the above objectives, the present application proposes an oil pressure alarm diagnostic method, the oil pressure alarm diagnostic method comprising:

[0007] Obtain the real-time oil pressure and target oil pressure of the engine lubrication system;

[0008] Determining whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold;

[0009] When the oil pressure difference exceeds the preset alarm threshold, determining whether the real-time oil pressure is greater than the target oil pressure;

[0010] When the real-time oil pressure is greater than the target oil pressure, controlling the electronically controlled valve to open and close;

[0011] The real-time oil pressure when the electric control valve is opening and closing is collected, and when the difference in the real-time oil pressure before and after the electric control valve is opened and closed does not exceed a preset oil pressure threshold, an oil pressure alarm is issued.

[0012] In one embodiment, after the step of determining whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold, the method further includes:

[0013] When the real-time oil pressure is less than the target oil pressure, comparing the real-time oil pressure with a preset lower limit oil pressure;

[0014] When the real-time oil pressure is less than the preset lower limit oil pressure, controlling the change of the VVT ​​angle at the end of the engine oil circuit;

[0015] Get the actual angle and target angle of VVT;

[0016] When the difference between the actual angle and the target angle exceeds a preset angle threshold, an oil pressure alarm is issued.

[0017] In one embodiment, after the step of obtaining the actual angle and the target angle of the VVT, the method further includes:

[0018] When the difference between the actual angle and the target angle does not exceed the preset angle threshold, an oil pressure sensor abnormality alarm is issued.

[0019] In one embodiment, after the step of comparing the real-time oil pressure with a preset lower limit oil pressure when the real-time oil pressure is less than the target oil pressure, the method further includes:

[0020] When the real-time oil pressure is greater than the preset lower limit oil pressure, the PCJ solenoid valve is controlled to be closed and the engine is controlled to operate at medium or low load;

[0021] When the real-time oil pressure recollected after the PCJ solenoid valve is closed exceeds the preset oil pressure threshold, an oil pressure alarm is issued.

[0022] In one embodiment, after the step of controlling the PCJ solenoid valve to close and controlling the engine to operate at medium and low load when the real-time oil pressure is greater than the preset lower limit oil pressure, the method further includes:

[0023] When the real-time oil pressure recollected after the PCJ solenoid valve is closed does not exceed the preset oil pressure threshold, no oil pressure alarm is issued.

[0024] In one embodiment, the step of collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and performing an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed does not exceed a preset oil pressure threshold, further includes:

[0025] The real-time oil pressure when the electronically controlled valve is opening and closing is collected, and when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds a preset oil pressure threshold, no oil pressure alarm is issued.

[0026] In one embodiment, after the step of collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and not issuing an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds a preset oil pressure threshold, the step further includes:

[0027] The PCJ solenoid valve is controlled to open and the opening of the electric control valve is controlled until the real-time oil pressure does not exceed the preset upper limit oil pressure.

[0028] In addition, to achieve the above-mentioned purpose, the present application also proposes an oil pressure alarm diagnostic device, the oil pressure alarm diagnostic device comprising:

[0029] An information acquisition module, used to obtain the real-time oil pressure and target oil pressure of the engine lubrication system;

[0030] A state judgment module, used to judge whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold;

[0031] The state judgment module is used to judge whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold;

[0032] The state judgment module is further used to control the electronically controlled valve to open and close when the real-time oil pressure is greater than the target oil pressure;

[0033] The fault alarm module is used to collect the real-time oil pressure when the electric control valve is opening and closing, and to issue an oil pressure alarm when the difference between the real-time oil pressure before and after the electric control valve is opened and closed does not exceed a preset oil pressure threshold.

[0034] In addition, to achieve the above-mentioned purpose, the present application also proposes an oil pressure alarm diagnostic device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the oil pressure alarm diagnostic method as described above.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the oil pressure alarm diagnostic method described above are implemented.

[0036] The present application provides an oil pressure alarm diagnosis method, which obtains the real-time oil pressure and target oil pressure of the engine lubrication system; determines whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds the preset alarm threshold; when the oil pressure difference exceeds the preset alarm threshold, determines whether the real-time oil pressure is greater than the target oil pressure, and controls the electronic control valve to open and close when the real-time oil pressure is greater than the target oil pressure; collects the real-time oil pressure when the electronic control valve is opening and closing, and issues an oil pressure alarm when the difference in real-time oil pressure before and after the electronic control valve is opened and closed does not exceed the preset oil pressure threshold. The engine oil pressure is preliminarily diagnosed through the real-time oil pressure and target oil pressure of the engine lubrication system, and at the same time, it is controlled by the electronic control valve set at the end of the oil circuit to determine that the fault is indeed from the abnormal oil pressure of the engine lubrication system, thereby improving the driving experience of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 This is a flow chart of the first embodiment of the oil pressure alarm diagnostic method of the present application;

[0040] Figure 2 It is a structural schematic diagram of an engine lubrication system in the prior art;

[0041] Figure 3 This is a schematic diagram of the structure of the engine lubrication system in the first embodiment of the oil pressure alarm diagnostic method of the present application;

[0042] Figure 4 A flow chart of the second embodiment of the oil pressure alarm diagnostic method of the present application;

[0043] Figure 5 A flow chart of the third embodiment of the oil pressure alarm diagnostic method of the present application;

[0044] Figure 6 This is a schematic diagram of the module structure of the oil pressure alarm diagnostic device according to an embodiment of the present application;

[0045] Figure 7 Schematic diagram of the structure of the oil pressure alarm diagnostic device of the hardware operating environment involved in the oil pressure alarm diagnostic method in the embodiment of the present application.

[0046] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0048] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0049] The main solution of the embodiment of the present application is: to obtain the real-time oil pressure and target oil pressure of the engine lubrication system; to determine whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds the preset alarm threshold; when the oil pressure difference exceeds the preset alarm threshold, to determine whether the real-time oil pressure is greater than the target oil pressure, and when the real-time oil pressure is greater than the target oil pressure, to control the electric control valve to open and close; to collect the real-time oil pressure when the electric control valve is opening and closing, and to issue an oil pressure alarm when the difference in real-time oil pressure before and after the opening and closing of the electric control valve does not exceed the preset oil pressure threshold.

[0050] In the prior art, when the oil circuit behind the oil pressure sensor fails (for example, the VVT ​​at the end of the oil circuit, the high-pressure oil pump, the camshaft oil circuit, etc. is blocked or leaking), the oil pressure sensor may not be able to feedback the oil circuit failure and will not issue an oil pressure alarm, which may cause engine damage.

[0051] The present application provides a solution, which preliminarily diagnoses the engine oil pressure through the real-time oil pressure and target oil pressure of the engine lubrication system, and controls it through the electronically controlled valve set at the end of the oil circuit to determine that the fault is indeed caused by the abnormal oil pressure of the engine lubrication system, thereby eliminating the over-protection caused by the inability of the pressure sensor to accurately reflect the fault at the rear end of the oil circuit, and improving the driving experience of the vehicle.

[0052] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an oil pressure alarm diagnostic device that can realize the above functions, etc. The following takes the oil pressure alarm diagnostic device as an example to illustrate this embodiment and the following embodiments.

[0053] Based on this, the embodiment of the present application provides an oil pressure alarm diagnosis method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the oil pressure alarm diagnostic method of the present application.

[0054] In this embodiment, the oil pressure alarm diagnosis method includes steps S10 to S40:

[0055] Step S10: Acquire the real-time oil pressure and target oil pressure of the engine lubrication system.

[0056] It should be noted that the real-time oil pressure may be the oil pressure of the main oil channel collected in real time by the pressure sensor in the engine lubrication system, and the target oil pressure may be the preset oil pressure that the engine lubrication system should be at to ensure the normal operation of the vehicle under the current operating conditions.

[0057] It should be understood that the engine lubrication system includes the engine oil system and oil-using components such as main bearings, connecting rod bearings, piston cooling jets (PCJ), chain tensioners, variable valve timing systems (VVT), camshafts, high-pressure oil pumps, and vacuum pumps. According to the simulation calculation of the lubrication system, the PCJ flow rate accounts for about 30% of the total flow rate of the lubrication system. For the PCJ controlled by the solenoid valve, the solenoid valve is used to control whether to open the PCJ oil spray cooling piston. When the PCJ is suddenly opened, the flow demand of the engine lubrication system suddenly increases sharply, which will cause the main oil channel oil pressure to drop suddenly. The engine VVT ​​angle adjustment change is to provide a certain oil pressure through the engine oil pump to promote the VVT ​​actuator to change the angle. When the engine oil pressure is low, it will not be able to promote the change of the VVT ​​angle. The oil pressure sensor is arranged in the main oil channel of the engine lubrication system. When the oil pressure sensor detects that the oil pressure exceeds the design threshold, it is determined that the oil pressure fails. At this time, the engine control module (ECU) will send an oil pressure alarm signal to the instrument, and the instrument will issue an abnormal oil pressure alarm after receiving the oil pressure alarm signal.

[0058] Reference Figure 2 and Figure 3 , Figure 2 It is a structural schematic diagram of an engine lubrication system in the prior art; Figure 3 This is a schematic diagram of the structure of the engine lubrication system in the first embodiment of the oil pressure alarm diagnostic method of the present application.

[0059] It should be noted that the oil pressure sensor is generally arranged in the main oil channel of the engine. The oil pressure sensor measures the oil pressure in the main oil channel of the engine to control the displacement of the variable displacement oil pump to control the oil pressure in the main oil channel of the engine. The measured oil pressure value is also used to determine whether the oil pressure is abnormal, and then determine whether an oil pressure alarm is required or the engine is shut down. Since the oil pressure in the main oil channel of the engine needs to be controlled to the target pressure, the oil pressure sensor is generally arranged in the main oil channel of the engine. However, when the oil circuit behind the oil pressure sensor fails (for example, when the VVT ​​at the end of the oil circuit, the high-pressure oil pump, the camshaft oil circuit, etc. is blocked or leaking), the oil pressure sensor may not be able to feedback the oil circuit failure, and will not issue an oil pressure alarm, which may cause engine damage.

[0060] It should be understood that this design can open the oil circuit at the end of the engine oil circuit and arrange an electronically controlled valve at the end. The electronically controlled valve can controllably open and close the oil circuit channel to return the oil in the oil circuit to the engine oil pan. When the engine is working under certain conditions (i.e., a certain oil temperature, engine speed, engine load), if the engine uses a variable displacement oil pump, a corresponding target oil pressure will be set for each operating point of the engine. The ECU will control the displacement of the variable displacement oil pump to make the oil pressure in the main oil channel of the engine reach the target oil pressure.

[0061] Furthermore, under the default condition of normal vehicle driving, the electronically controlled valves are kept in a closed state and do not participate in the passage of the oil in the oil circuit back to the engine oil pan. Only when a blockage may occur in the oil circuit, the valve opening strategy is implemented according to the setting.

[0062] Step S20: determining whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold.

[0063] It should be noted that the oil pressure difference may be the absolute value obtained by subtracting the target oil pressure from the real-time oil pressure, and the preset alarm threshold may be a pre-set parameter value for preliminarily judging an oil pressure failure. When the oil pressure difference exceeds the preset alarm threshold, it is preliminarily judged that there is a risk of an oil pressure failure, and when the oil pressure difference is lower than or equal to the preset alarm threshold, it is judged that no oil pressure failure has occurred.

[0064] It should be understood that the lower limit oil pressure alarm value and the upper limit oil pressure alarm value of the engine lubrication system can also be set. For example, the lower limit oil pressure can be set to 50kPa, and the upper limit oil pressure can be set to 1200kPa. The specific settings can be adjusted according to the hardware structure of the vehicle and are not specifically limited here. Among them, the lower limit of the oil pressure can be the minimum pressure requirement to ensure the normal lubrication function of the engine when the engine is running (the VVT ​​angle cannot be adjusted normally when the oil pressure is lower than the lower limit), and the upper limit of the oil pressure can be the maximum pressure resistance of the lubrication system. When the oil pressure exceeds the upper limit, the oil filter and other lubrication system seals will leak oil.

[0065] Step S30: When the oil pressure difference exceeds the preset alarm threshold, determining whether the real-time oil pressure is greater than the target oil pressure.

[0066] It should be noted that when the oil pressure difference exceeds the preset alarm threshold, it is preliminarily judged that there is a risk of oil pressure failure. At this time, it can be judged whether the real-time oil pressure is greater than the target oil pressure by judging the positive or negative value of the oil pressure difference. According to the judgment of high and low conditions, the fault can be divided into: If the target oil pressure is greater than the real-time oil pressure, it means that the engine lubrication system may have a leakage fault at this time, and the real-time oil pressure cannot be increased to the target oil pressure. If the real-time oil pressure is greater than the target oil pressure, it means that the engine lubrication system may have a blockage fault at this time, and the real-time oil pressure cannot be reduced to the target oil pressure.

[0067] Step S40: When the real-time oil pressure is greater than the target oil pressure, the electronically controlled valve is controlled to open and close.

[0068] It should be noted that the electronically controlled valve can control the opening and closing of the oil circuit. After the electronically controlled valve is opened, the oil in the oil circuit can return to the engine oil pan, thereby causing the real-time oil pressure to drop. Correspondingly, when the electronically controlled valve is in the closed state, the oil cannot return to the engine oil pan through the electronically controlled valve channel at the end of the oil circuit.

[0069] Step S50: collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and issuing an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed does not exceed a preset oil pressure threshold.

[0070] It should be understood that since the real-time oil pressure is greater than the target oil pressure, it means that the engine lubrication system may be unable to relieve pressure or the engine oil channel may be blocked. At this time, the electronically controlled valve at the end of the engine oil circuit can be controlled to open and close, and the change in the oil pressure in the main oil channel of the engine can be detected. When the electronically controlled valve at the end of the oil circuit is opened and closed, and the oil pressure in the main oil channel does not change (or is less than the threshold), it means that the engine oil circuit is blocked. At this time, the oil pressure alarm is directly issued, and the engine is controlled to shut down. If the change in the real-time oil pressure of the engine lubrication system is greater than or equal to the threshold, it means that the engine oil channel is not blocked. At this time, the PCJ is forced to open to reduce the engine oil pressure, and the electronically controlled valve at the end of the oil circuit is controlled to open so that the oil pressure in the main oil channel of the engine is less than the upper limit oil pressure. The driver is notified of the engine lubrication system failure through the indicator light or the prompt sound, but it does not affect the continued driving of the vehicle.

[0071] In this embodiment, the real-time oil pressure and target oil pressure of the engine lubrication system are obtained; it is determined whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds the preset alarm threshold; when the oil pressure difference exceeds the preset alarm threshold, it is determined whether the real-time oil pressure is greater than the target oil pressure; when the real-time oil pressure is greater than the target oil pressure, the electric control valve is controlled to open and close; the real-time oil pressure when the electric control valve is opened and closed is collected, and when the difference in the real-time oil pressure before and after the electric control valve is opened and closed does not exceed the preset oil pressure threshold, an oil pressure alarm is issued. The real-time oil pressure and target oil pressure of the engine lubrication system are used to preliminarily diagnose the engine oil pressure, and at the same time, the electric control valve set at the end of the oil circuit is used to control the fault to determine that the fault is indeed caused by the abnormal oil pressure of the engine lubrication system, thereby eliminating the over-protection caused by the inability of the pressure sensor to accurately reflect the fault at the rear end of the oil circuit, and improving the driving experience of the vehicle.

[0072] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 , Figure 4 The flowchart of the second embodiment of the oil pressure alarm diagnostic method of the present application is provided. In step S30, the oil pressure alarm diagnostic method includes:

[0073] Step S401: When the real-time oil pressure is less than the target oil pressure, the real-time oil pressure is compared with a preset lower limit oil pressure.

[0074] It should be noted that the preset lower limit oil pressure can be the oil pressure that is the minimum pressure required to ensure the normal lubrication function of the engine when the engine is running (when the oil pressure is lower than the lower limit, the VVT ​​angle cannot be adjusted normally). For example, it can be set to 50KPa. If the real-time oil pressure is lower than the lower limit oil pressure, it means that the pressure of the engine lubrication system is too low at this time. When the real-time oil pressure is greater than the preset lower limit oil pressure, it means that the oil pressure in the main oil channel of the engine cannot reach the target oil pressure by adjusting the displacement of the oil pump. It may be due to a failure of the oil pump that causes the oil pump to replenish the oil supply, or there may be a leak in the engine lubrication system.

[0075] Step S402: When the real-time oil pressure is less than the preset lower limit oil pressure, controlling the change of the VVT ​​angle at the end of the engine oil circuit.

[0076] It should be noted that since the real-time oil pressure is lower than the preset lower limit oil pressure, the engine lubrication system pressure collected by the pressure sensor is too low. It is necessary to specifically determine whether it is caused by leakage in the engine lubrication system or by an incorrect measurement value of the pressure sensor.

[0077] Step S403: Acquire the actual angle and target angle of the VVT.

[0078] It should be noted that the VVT ​​angle change at the end of the engine oil circuit can be controlled and the actual VVT angle can be measured. When the actual VVT angle and the target angle match well, it means that the actual oil pressure can meet the engine function requirements. In fact, the oil pressure sensor measurement value is wrong, that is, the oil pressure sensor is abnormal.

[0079] It should be understood that after determining that the oil pressure sensor is abnormal, the abnormal fault of the oil pressure sensor can be reminded by means of an indicator light or a prompt sound, and the engine torque can be limited.

[0080] Step S404: when the difference between the actual angle and the target angle exceeds a preset angle threshold, an oil pressure alarm is issued.

[0081] It should be noted that if the VVT ​​angle cannot be adjusted normally, it means that the oil pressure is indeed lower than the lower limit oil pressure, and the oil pressure alarm is directly issued through the indicator light or prompt sound, and the engine is controlled to shut down. If the difference between the actual VVT angle and the target angle does not exceed the preset angle threshold, it means that the oil pressure sensor collects distorted values, and a sensor abnormality fault alarm is issued.

[0082] In specific implementation, when the actual oil pressure is lower than the target oil pressure, it may be that the actual oil pressure is low or there is a leak. You can judge whether the oil pressure is really low by keeping the electronic control valve closed and comparing the VVT ​​angle with the target angle. If the difference between the actual VVT angle and the target angle exceeds the preset angle threshold, it means that it is indeed low (the sensor pressure value is credible). You can increase the actual oil pressure by closing the PCJ to reduce the oil flow. If the actual oil pressure returns to a level that exceeds the preset lower limit, you can continue driving. If it is still lower than the preset lower limit, the car will stop and alarm.

[0083] In this embodiment, when the real-time oil pressure is less than the target oil pressure, the real-time oil pressure is compared with the preset lower limit oil pressure; when the real-time oil pressure is less than the preset lower limit oil pressure, the VVT ​​angle change at the end of the engine oil circuit is controlled; the actual angle and target angle of the VVT ​​are obtained; when the difference between the actual angle and the target angle does not exceed the preset angle threshold, an abnormal alarm of the oil pressure sensor is issued, and when the real-time oil pressure is greater than the preset lower limit oil pressure, the PCJ solenoid valve is controlled to close and the engine is controlled to run at medium and low loads; and when the real-time oil pressure re-collected after the PCJ solenoid valve is closed does not exceed the preset oil pressure threshold, no oil pressure alarm is issued. The leakage condition of the engine lubrication system can be accurately judged, and the over-protection condition can be avoided by controlling the electronically controlled valve and the engine to improve the driving experience of the vehicle.

[0084] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned first and second embodiments can refer to the above introduction, and will not be repeated later. Figure 5 , Figure 5 A flow chart of the third embodiment of the oil pressure alarm diagnostic method of the present application is provided.

[0085] After step S40, the oil pressure alarm diagnosis method includes:

[0086] Step S501: collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds a preset oil pressure threshold, no oil pressure alarm is issued.

[0087] Step S502: Control the PCJ solenoid valve to open and control the opening of the electronically controlled valve until the real-time oil pressure does not exceed the preset upper limit oil pressure.

[0088] It should be noted that the preset upper limit oil pressure can be the maximum pressure resistance of the engine lubrication system. When the oil pressure exceeds the preset upper limit oil pressure, the oil filter and other lubrication system seals will leak oil. For example, it can be set to 1200KPa. If the real-time oil pressure exceeds the preset upper limit oil pressure, it means that the oil pressure of the engine lubrication system is too high.

[0089] It should be understood that when the electronic control valve at the end of the oil circuit opens and closes, if the oil pressure change in the main oil channel (i.e., the difference in real-time oil pressure before and after the above-mentioned electronic control valve is opened and closed) is greater than or equal to the preset oil pressure threshold, it means that the engine oil channel is not blocked. At this time, the PCJ is forced to open to reduce the engine oil pressure, and the opening of the electronic control valve at the end of the oil circuit is controlled to make the oil pressure in the main oil channel of the engine less than the preset upper limit oil pressure. At the same time, the driver is notified of a failure in the engine lubrication system, but it does not affect the continued driving of the vehicle, and the driver is reminded to inspect the vehicle.

[0090] In this embodiment, by collecting the real-time oil pressure when the electronically controlled valve is opening and closing, when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds the preset oil pressure threshold, the oil pressure alarm is not issued. The PCJ solenoid valve is controlled to open and the electronically controlled valve opening is controlled until the real-time oil pressure does not exceed the preset upper limit oil pressure. This further improves the accuracy of the blockage judgment in the engine lubrication system diagnosis results, and at the same time can avoid the over-protection condition to improve the driving experience of the vehicle.

[0091] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the oil pressure alarm diagnostic method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0092] This application also provides an oil pressure alarm diagnostic device, please refer to Figure 6 , the oil pressure alarm diagnostic device comprises:

[0093] The information acquisition module 10 is used to obtain the real-time oil pressure and target oil pressure of the engine lubrication system;

[0094] A state judgment module 20 is used to judge whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold;

[0095] The state judgment module 20 is used to judge whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold;

[0096] The state judgment module 20 is further used to control the electronically controlled valve to open and close when the real-time oil pressure is greater than the target oil pressure;

[0097] The fault alarm module 30 is used to collect the real-time oil pressure when the electronically controlled valve is opened and closed, and to issue an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed does not exceed a preset oil pressure threshold.

[0098] Optionally, the status judgment module 20 is also used to compare the real-time oil pressure with a preset lower limit oil pressure when the real-time oil pressure is less than the target oil pressure; control the VVT ​​angle change at the end of the engine oil circuit when the real-time oil pressure is less than the preset lower limit oil pressure; obtain the actual angle and target angle of the VVT; and issue an oil pressure alarm when the difference between the actual angle and the target angle exceeds a preset angle threshold.

[0099] Optionally, the state judgment module 20 is further configured to issue an oil pressure sensor abnormality alarm when the difference between the actual angle and the target angle does not exceed a preset angle threshold.

[0100] Optionally, the status judgment module 20 is also used to control the PCJ solenoid valve to close and control the engine to operate at medium and low loads when the real-time oil pressure is greater than the preset lower limit oil pressure; and to issue an oil pressure alarm when the real-time oil pressure re-collected after the PCJ solenoid valve is closed exceeds the preset oil pressure threshold.

[0101] Optionally, the state judgment module 20 is further configured to not issue an oil pressure alarm when the real-time oil pressure recollected after the PCJ solenoid valve is closed does not exceed a preset oil pressure threshold.

[0102] Optionally, the fault alarm module 30 is also used to collect the real-time oil pressure when the electric control valve is opening and closing. When the difference in real-time oil pressure before and after the electric control valve is opened and closed exceeds a preset oil pressure threshold, no oil pressure alarm is issued.

[0103] Optionally, the fault alarm module 30 is also used to control the opening of the PCJ solenoid valve and control the opening of the electronically controlled valve until the real-time oil pressure does not exceed a preset upper limit oil pressure.

[0104] The oil pressure alarm diagnostic device provided by the present application adopts the oil pressure alarm diagnostic method in the above embodiment, which can solve the technical problem that the oil pressure sensor cannot accurately feedback the oil circuit fault, resulting in inaccurate engine oil pressure diagnosis. Compared with the prior art, the beneficial effects of the oil pressure alarm diagnostic device provided by the present application are the same as the beneficial effects of the oil pressure alarm diagnostic method provided by the above embodiment, and the other technical features of the oil pressure alarm diagnostic device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0105] The present application provides an oil pressure alarm diagnostic device, which includes: at least one processor; and a memory that is communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the oil pressure alarm diagnostic method in the above-mentioned embodiment one.

[0106] Reference below Figure 7 , which shows a schematic diagram of the structure of the oil pressure alarm diagnostic device suitable for implementing the embodiment of the present application. The oil pressure alarm diagnostic device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The oil pressure alarm diagnostic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0107] like Figure 7 As shown, the oil pressure alarm diagnostic device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the oil pressure alarm diagnostic device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the oil pressure warning diagnostic device to communicate with other devices wirelessly or by wire to exchange data. Although the oil pressure warning diagnostic device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided alternatively.

[0108] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0109] The oil pressure alarm diagnostic device provided by the present application adopts the oil pressure alarm diagnostic method in the above embodiment, which can solve the technical problem that the oil pressure sensor cannot accurately feedback the oil circuit fault, resulting in inaccurate engine oil pressure diagnosis. Compared with the prior art, the beneficial effects of the oil pressure alarm diagnostic device provided by the present application are the same as the beneficial effects of the oil pressure alarm diagnostic method provided by the above embodiment, and the other technical features of the oil pressure alarm diagnostic device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0110] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0112] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the oil pressure alarm diagnostic method in the above-mentioned embodiment.

[0113] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0114] The computer-readable storage medium may be included in the oil pressure alarm diagnostic device; or may exist independently without being assembled into the oil pressure alarm diagnostic device.

[0115] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0116] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0117] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0118] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned oil pressure alarm diagnostic method, and can solve the technical problem that the oil pressure sensor cannot accurately feedback the oil circuit fault, resulting in inaccurate engine oil pressure diagnosis. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the oil pressure alarm diagnostic method provided by the above-mentioned embodiment, and will not be repeated here.

[0119] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for diagnosing an oil pressure alarm, characterized in that: The oil pressure alarm diagnostic method comprises: Obtain the real-time oil pressure and target oil pressure of the engine lubrication system; Determining whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold; When the oil pressure difference exceeds the preset alarm threshold, determining whether the real-time oil pressure is greater than the target oil pressure; When the real-time oil pressure is greater than the target oil pressure, controlling the electronically controlled valve to open and close; The real-time oil pressure when the electric control valve is opening and closing is collected, and when the difference in the real-time oil pressure before and after the electric control valve is opened and closed does not exceed a preset oil pressure threshold, an oil pressure alarm is issued.

2. The oil pressure alarm diagnostic method according to claim 1, characterized in that: After the step of determining whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold, the method further includes: When the real-time oil pressure is less than the target oil pressure, comparing the real-time oil pressure with a preset lower limit oil pressure; When the real-time oil pressure is less than the preset lower limit oil pressure, controlling the change of the VVT ​​angle at the end of the engine oil circuit; Get the actual angle and target angle of VVT; When the difference between the actual angle and the target angle exceeds a preset angle threshold, an oil pressure alarm is issued.

3. The oil pressure alarm diagnostic method according to claim 2, characterized in that: After the step of obtaining the actual angle and the target angle of the VVT, the method further includes: When the difference between the actual angle and the target angle does not exceed the preset angle threshold, an oil pressure sensor abnormality alarm is issued.

4. The oil pressure alarm diagnostic method according to claim 2, characterized in that: After the step of comparing the real-time oil pressure with a preset lower limit oil pressure when the real-time oil pressure is less than the target oil pressure, the method further includes: When the real-time oil pressure is greater than the preset lower limit oil pressure, the PCJ solenoid valve is controlled to be closed and the engine is controlled to operate at medium or low load; When the real-time oil pressure recollected after the PCJ solenoid valve is closed exceeds the preset oil pressure threshold, an oil pressure alarm is issued.

5. The oil pressure alarm diagnostic method according to claim 2, characterized in that: After the step of controlling the PCJ solenoid valve to close and controlling the engine to operate at a medium or low load when the real-time oil pressure is greater than the preset lower limit oil pressure, the method further includes: When the real-time oil pressure recollected after the PCJ solenoid valve is closed does not exceed the preset oil pressure threshold, no oil pressure alarm is issued.

6. The oil pressure alarm diagnostic method according to claim 1, characterized in that: The step of collecting the real-time oil pressure when the electric control valve is opening and closing, and issuing an oil pressure alarm when the difference between the real-time oil pressure before and after the electric control valve is opened and closed does not exceed a preset oil pressure threshold, further includes: The real-time oil pressure when the electronically controlled valve is opening and closing is collected, and when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds a preset oil pressure threshold, no oil pressure alarm is issued.

7. The oil pressure alarm diagnostic method according to claim 6, characterized in that: After the step of collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and not issuing an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve is opened and closed exceeds a preset oil pressure threshold, the method further includes: The PCJ solenoid valve is controlled to open and the opening of the electric control valve is controlled until the real-time oil pressure does not exceed the preset upper limit oil pressure.

8. An oil pressure alarm diagnostic device, characterized in that: The device comprises: An information acquisition module, used to obtain the real-time oil pressure and target oil pressure of the engine lubrication system; A state judgment module, used to judge whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold; The state judgment module is used to judge whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold; The state judgment module is further used to control the electronically controlled valve to open and close when the real-time oil pressure is greater than the target oil pressure; The fault alarm module is used to collect the real-time oil pressure when the electric control valve is opening and closing, and to issue an oil pressure alarm when the difference between the real-time oil pressure before and after the electric control valve is opened and closed does not exceed a preset oil pressure threshold.

9. An oil pressure alarm diagnostic device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the oil pressure alarm diagnostic method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the oil pressure alarm diagnostic method according to any one of claims 1 to 7 are implemented.

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