Oil pressure alarm diagnosis method, device, equipment and storage medium

Abstract

The application discloses an engine oil pressure alarm diagnosis method, device, equipment and storage medium, and relates to the technical field of vehicle fault diagnosis. The engine oil pressure alarm diagnosis method comprises the following steps: acquiring real-time oil pressure and target oil pressure of an engine lubricating system; judging whether an oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold value; when the oil pressure difference exceeds the preset alarm threshold value, judging 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, controlling an electric control valve to perform opening and closing actions; collecting real-time oil pressure when the electric control valve performs the opening and closing actions, and when a 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 value, performing engine oil pressure alarm. Through the real-time oil pressure and the target oil pressure of the engine lubricating system, engine oil pressure is preliminarily diagnosed, and through the control of the electric control valve arranged at the end of the oil circuit, it is determined that the fault is indeed caused by oil pressure abnormity of the engine lubricating system, and the driving experience of the vehicle is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle fault diagnosis technology, and in particular to an oil pressure alarm diagnosis method, device, equipment and storage medium. Background Technology

[0002] The engine lubrication system is designed to ensure that the oil pressure of all oil-using components and oil passages meets design requirements under various extreme operating conditions. Excessive oil pressure can lead to leaks at locations such as the oil filter, while insufficient oil pressure can damage oil-using components such as the main bearings, ultimately causing engine damage. Therefore, to ensure the normal operation of the engine lubrication system, an oil pressure alarm system is generally installed.

[0003] Existing technologies typically involve installing an oil pressure sensor in the engine's main oil passage. This sensor measures the oil pressure in the main passage, and when the measured pressure exceeds a specified threshold, an oil pressure fault is detected. However, when a fault occurs in the oil circuit downstream of the oil pressure sensor (e.g., blockage or leakage at the VVT, high-pressure oil pump, or camshaft oil passage), the oil pressure sensor may not detect the fault and will not issue an oil pressure alarm, potentially leading to engine damage.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide an oil pressure alarm diagnosis method, device, equipment, and storage medium, aiming to solve the technical problem in the prior art where oil pressure sensors cannot accurately report oil circuit faults, resulting in inaccurate engine oil pressure diagnosis.

[0006] To achieve the above objectives, this application proposes a method for diagnosing engine oil pressure alarms, the method comprising:

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

[0008] Determine 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, it is determined 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, the electronically controlled valve is opened and closed.

[0011] The real-time oil pressure is collected when the electronically controlled valve is opening and closing. If the difference in real-time oil pressure before and after the electronically controlled valve is opening and closing does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered.

[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, the real-time oil pressure is compared with a preset lower limit oil pressure;

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

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

[0016] An oil pressure alarm is triggered when the difference between the actual angle and the target angle exceeds a preset angle threshold.

[0017] In one embodiment, after the step of obtaining the actual angle and target angle of 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 malfunction alarm is triggered.

[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 closed and the engine is controlled to operate at low to medium load.

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

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

[0023] If 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 will be triggered.

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

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

[0026] In one embodiment, after the step of collecting the real-time oil pressure when the electronically controlled valve opens and closes, and not triggering an oil pressure alarm when the difference in real-time oil pressure before and after the opening and closing of the electronically controlled valve exceeds a preset oil pressure threshold, the method further includes:

[0027] Control the opening of the PCJ solenoid valve and control the opening degree of the electronically controlled valve until the real-time oil pressure does not exceed the preset upper limit oil pressure.

[0028] Furthermore, to achieve the above objectives, this application also proposes an oil pressure alarm diagnostic device, which includes:

[0029] The information acquisition module is used to acquire the real-time oil pressure and target oil pressure of the engine lubrication system;

[0030] The status judgment module is used to determine whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold.

[0031] The status judgment module is used to determine 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 status judgment module is also 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 electronically controlled valve is opening and closing. When the difference between the real-time oil pressure before and after the electronically controlled valve is opening and closing does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered.

[0034] In addition, to achieve the above objectives, this application also proposes an oil pressure alarm diagnostic device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the oil pressure alarm diagnostic method as described above.

[0035] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the oil pressure alarm diagnosis method described above.

[0036] This application provides a method for diagnosing engine oil pressure alarms. The method involves acquiring the real-time oil pressure and target oil pressure of the engine lubrication system; determining whether the pressure difference between the real-time and target oil pressures exceeds a preset alarm threshold; if the pressure difference exceeds the preset alarm threshold, determining whether the real-time oil pressure is greater than the target oil pressure; and if the real-time oil pressure is greater than the target oil pressure, controlling an electronically controlled valve to open and close; and collecting the real-time oil pressure during the opening and closing of the electronically controlled valve. If the difference in real-time oil pressure before and after the opening and closing of the electronically controlled valve does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered. By using the real-time and target oil pressures of the engine lubrication system, a preliminary diagnosis of engine oil pressure is made. Simultaneously, by controlling the electronically controlled valve located at the end of the oil circuit, it is confirmed that the fault indeed originates from abnormal oil pressure in the engine lubrication system, thus improving the vehicle's driving experience. Attached Figure Description

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

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating the first embodiment of the oil pressure alarm diagnosis method of this application;

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

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

[0042] Figure 4 This is a flowchart illustrating Embodiment 2 of the oil pressure alarm diagnosis method of this application;

[0043] Figure 5 This is a flowchart illustrating Embodiment 3 of the oil pressure alarm diagnosis method of this application;

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

[0045] Figure 7 This is a schematic diagram of the structure of the oil pressure alarm diagnosis device in the hardware operating environment of the oil pressure alarm diagnosis method in this application embodiment.

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

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0048] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0049] The main solution of this application embodiment 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 a 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 electronically controlled valve to perform opening and closing actions; to collect the real-time oil pressure when the electronically controlled valve performs opening and closing actions, and to perform an oil pressure alarm when the difference between the real-time oil pressure before and after the electronically controlled valve opens and closes does not exceed the preset oil pressure threshold.

[0050] In the existing technology, when there is a fault in the oil circuit after the oil pressure sensor (such as blockage or leakage at the end of the oil circuit, VVT, high-pressure oil pump, camshaft oil circuit, etc.), the oil pressure sensor may not be able to report the oil circuit fault and will not issue an oil pressure alarm, which may lead to engine damage.

[0051] This application provides a solution that preliminarily diagnoses engine oil pressure by comparing real-time and target oil pressures in the engine lubrication system. Simultaneously, it controls the system through an electronically controlled valve located at the end of the oil circuit to confirm that the fault indeed originates from abnormal oil pressure in the engine lubrication system. This eliminates over-protection caused by pressure sensors failing to accurately reflect faults at the downstream end of the oil circuit, thereby improving the vehicle's driving experience.

[0052] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an oil pressure alarm diagnostic device capable of performing the above functions. The following description uses an oil pressure alarm diagnostic device as an example to illustrate this embodiment and the subsequent embodiments.

[0053] Based on this, the embodiments of this application provide a method for diagnosing engine oil pressure alarms, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the oil pressure alarm diagnosis method of this application.

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

[0055] Step S10: Obtain 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 can be the oil pressure of the main oil passage collected in real time by the pressure sensor in the engine lubrication system, and the target oil pressure can be the 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 passage system and oil-using components such as main bearings, connecting rod bearings, piston cooling jets (PCJs), chain tensioners, variable valve timing (VVT) system, camshaft, high-pressure oil pump, and vacuum pump. According to lubrication system simulation calculations, the PCJ flow rate accounts for approximately 30% of the total lubrication system flow rate. For solenoid-controlled PCJs, the on / off state of the solenoid valve controls whether the PCJ is activated to inject oil and cool the piston. When the PCJ suddenly activates, the sudden and significant increase in the engine lubrication system's flow demand causes a sudden drop in the main oil passage pressure. The engine VVT ​​angle adjustment requires a certain oil pressure from the engine oil pump to drive the VVT ​​actuator to change its angle. When the engine oil pressure is low, it will be unable to drive the VVT ​​angle change. An oil pressure sensor is installed in the main oil passage of the engine lubrication system. When the oil pressure sensor detects that the oil pressure exceeds the design threshold, it determines that the oil pressure has failed. At this time, the engine control module (ECU) will send an oil pressure alarm signal to the instrument panel, and the instrument panel will issue an abnormal oil pressure alarm after receiving the oil pressure alarm signal.

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

[0059] It's important to note that oil pressure sensors are typically located in the engine's main oil passage. They measure the oil pressure in this passage to control the displacement of the variable displacement oil pump, thereby controlling the oil pressure in the main oil passage. The sensors also determine if there are any abnormal oil pressure readings, prompting a warning or engine shutdown. Because the oil pressure in the main oil passage needs to be controlled to the target pressure, the oil pressure sensor is usually located there. However, if a fault occurs in the oil circuit downstream of the oil pressure sensor (e.g., blockage or leakage at the VVT, high-pressure oil pump, or camshaft oil passage), the oil pressure sensor may not detect the fault and will not issue a warning, potentially leading to engine damage.

[0060] It should be understood that this design achieves this by opening the oil passage at its very end and placing an electronically controlled valve there. This valve can controllably open and close the oil passage, allowing the engine oil to return to the engine oil pan. When the engine operates under certain conditions (i.e., a specific oil temperature, engine speed, and engine load), if the engine uses a variable displacement oil pump, a corresponding target oil pressure will be set for each operating point. The ECU will control the displacement of the variable displacement oil pump to ensure that the oil pressure in the engine's main oil passage reaches the target oil pressure.

[0061] Furthermore, under the default normal driving conditions, the electronically controlled valves remain closed and do not participate in the oil return path from the oil circuit to the engine oil pan. The valves will only open according to the set strategy when there is a possibility of blockage in the oil circuit.

[0062] Step S20: Determine 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 can be the absolute value obtained by subtracting the target oil pressure from the real-time oil pressure, and the preset alarm threshold can be a pre-set parameter value for initially judging oil pressure failure. When the oil pressure difference exceeds the preset alarm threshold, it is initially judged that there is a risk of oil pressure failure, while 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 a lower limit and an upper limit oil pressure alarm value for the engine lubrication system can also be set. For example, the lower limit oil pressure can be set to 50 kPa and the upper limit oil pressure to 1200 kPa. The specific settings can be adjusted according to the vehicle's hardware structure, and no specific limitation is made here. The lower limit oil pressure can be the minimum pressure required to ensure the normal lubrication function of the engine during operation (the VVT ​​angle cannot be adjusted normally if the oil pressure is below the lower limit), and the upper limit oil pressure can be the maximum withstand pressure of the lubrication system. If the oil pressure exceeds the upper limit, oil leakage will occur in the seals of the lubrication system such as the time filter.

[0065] Step S30: When the oil pressure difference exceeds the preset alarm threshold, determine 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, a preliminary assessment indicates a risk of oil pressure failure. At this point, the sign of the oil pressure difference can be used to determine whether the real-time oil pressure is greater than the target oil pressure. Based on the assessment, the failure can be categorized as follows: If the target oil pressure is greater than the real-time oil pressure, it indicates a possible leak in the engine lubrication system, preventing the real-time oil pressure from reaching the target pressure. If the real-time oil pressure is greater than the target oil pressure, it indicates a possible blockage in the engine lubrication system, preventing the real-time oil pressure from decreasing to the target pressure.

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

[0068] It should be noted that the electronically controlled valve can control the opening and closing of the oil circuit. When the electronically controlled valve is open, 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 closed, 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: Collect the real-time oil pressure when the electronically controlled valve is opening and closing. If the difference in real-time oil pressure before and after the electronically controlled valve is opening and closing does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered.

[0070] It should be understood that if the real-time oil pressure is greater than the target oil pressure, it indicates that the engine lubrication system may be unable to release pressure or that the engine oil passages may be blocked. In this case, the opening and closing of the electronically controlled valve at the end of the engine oil circuit can be controlled, and the change in the main engine oil passage pressure can be detected. When the electronically controlled valve at the end of the oil circuit opens and closes, if the main oil passage pressure does not change (or is less than the threshold), it indicates that the engine oil circuit is blocked. At this time, an oil pressure alarm will be triggered directly, and the engine will be shut down. If the real-time oil pressure change of the engine lubrication system is greater than or equal to the threshold, it indicates that the engine oil passages are not blocked. In this case, the PCJ will be forced to open to reduce the engine oil pressure, and the electronically controlled valve at the end of the oil circuit will be controlled to open, so that the engine main oil passage pressure is lower than the upper limit pressure. The driver will be notified of the engine lubrication system malfunction through an indicator light or a warning sound, but this will 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 acquired; it is determined 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, 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 electronically controlled valve is controlled to open and close; the real-time oil pressure is collected when the electronically controlled valve opens and closes, and an oil pressure alarm is triggered when the difference in real-time oil pressure before and after the electronically controlled valve opens and closes does not exceed the preset oil pressure threshold. By using the real-time oil pressure and target oil pressure of the engine lubrication system, the engine oil pressure is initially diagnosed. Simultaneously, by controlling the electronically controlled valve located at the end of the oil circuit, it is confirmed that the fault indeed originates from abnormal oil pressure in the engine lubrication system, eliminating over-protection caused by the pressure sensor's inability to accurately reflect faults at the downstream end of the oil circuit, thus improving the vehicle's driving experience.

[0072] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 4 , Figure 4 This is a flowchart illustrating an embodiment of the oil pressure alarm diagnosis method of this application. In step S30, the oil pressure alarm diagnosis method includes:

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

[0074] It should be noted that the preset lower limit oil pressure can be the minimum oil pressure required to ensure normal lubrication of the engine during operation (the VVT ​​angle cannot be adjusted normally if the oil pressure is below the lower limit). For example, it can be set to 50 kPa. If the real-time oil pressure is lower than the lower limit oil pressure, it indicates that the engine lubrication system pressure is too low. If the real-time oil pressure is higher than the preset lower limit oil pressure, it indicates that adjusting the oil pump displacement still cannot bring the engine main oil passage pressure to the target oil pressure. This may be due to an oil pump malfunction causing insufficient 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, control the change of 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 determine whether this is due to a leak in the engine lubrication system or an error in the pressure sensor's measurement.

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

[0078] It should be noted that by controlling the change in the VVT ​​angle at the end of the engine oil circuit and measuring the actual VVT angle, when the actual VVT angle matches the target angle well, it indicates that the actual oil pressure can meet the engine's functional requirements. In reality, the oil pressure sensor measurement value is incorrect, that is, the oil pressure sensor is abnormal.

[0079] It should be understood that after determining that the oil pressure sensor is abnormal, the abnormality of the oil pressure sensor can be alerted by indicator light or beep, and the engine torque can be limited.

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

[0081] It should be noted that if the VVT ​​angle cannot be adjusted normally, it indicates that the oil pressure is indeed lower than the lower limit. An oil pressure alarm will be triggered directly via indicator light or audible warning, and the engine will be shut down. If the difference between the actual VVT angle and the target angle does not exceed the preset angle threshold, it indicates that the oil pressure sensor is distorting its readings, and a sensor malfunction alarm will be issued.

[0082] In practice, when the actual oil pressure is lower than the target oil pressure, it could be due to a genuinely low actual oil pressure or a leak. To determine if the oil pressure is truly low, the VVT ​​angle can be compared to the target angle while keeping the electronically controlled valve closed. If the difference between the actual and target VVT angles exceeds a preset angle threshold, it indicates a genuinely low pressure (the sensor pressure value is reliable). The actual oil pressure can be increased by closing the PCJ to reduce oil flow. Once the actual oil pressure recovers to above the preset lower limit, driving can continue. If the pressure remains below the preset lower limit, a stop alarm will be triggered.

[0083] In this embodiment, when the real-time oil pressure is lower than the target oil pressure, the real-time oil pressure is compared with a preset lower limit oil pressure; when the real-time oil pressure is lower than the preset lower limit oil pressure, the VVT ​​angle at the end of the engine oil circuit is controlled to change; the actual angle and the target angle of the VVT ​​are obtained; when the difference between the actual angle and the target angle does not exceed a preset angle threshold, an oil pressure sensor abnormality alarm is triggered; simultaneously, when the real-time oil pressure is higher than the preset lower limit oil pressure, the PCJ solenoid valve is controlled to close and the engine is controlled to operate at low to medium load; and when the real-time oil pressure re-acquired after the PCJ solenoid valve closes does not exceed the preset oil pressure threshold, no oil pressure alarm is triggered. This accurately determines the leakage status of the engine lubrication system and can avoid overprotection by controlling the electronically controlled valve and the engine, thereby improving the driving experience of the vehicle.

[0084] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to that in embodiments one and two above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 5 , Figure 5 This is a flowchart illustrating Embodiment 3 of the oil pressure alarm diagnosis method of this application.

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

[0086] Step S501: Collect the real-time oil pressure when the electronically controlled valve is opening and closing. If the difference between the real-time oil pressure before and after the electronically controlled valve is opening and closing exceeds the preset oil pressure threshold, no oil pressure alarm will be triggered.

[0087] Step S502: Control the PCJ solenoid valve to open and control the opening degree of the electronic control valve to ensure that 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 that the engine lubrication system can withstand. When the oil pressure exceeds the preset upper limit, oil leaks may occur in the seals of the lubrication system, such as the oil filter. For example, it can be set to 1200 kPa. If the real-time oil pressure exceeds the preset upper limit, it indicates that the oil pressure in the engine lubrication system is too high.

[0089] It should be understood that when the electronically controlled valve at the end of the oil circuit opens and closes, if the change in the main oil passage pressure (i.e., the difference in real-time oil pressure before and after the opening and closing of the aforementioned electronically controlled valve) is greater than or equal to the preset oil pressure threshold, it indicates that there is no blockage in the engine oil passage. At this time, the PCJ is forced to open to reduce the engine oil pressure and control the opening of the electronically controlled valve at the end of the oil circuit so that the engine main oil passage pressure is less than the preset upper limit oil pressure. At the same time, the driver is notified of an engine lubrication system malfunction, but this does not affect the continued driving of the vehicle, and the driver is reminded to have the vehicle inspected.

[0090] In this embodiment, by collecting the real-time oil pressure when the electronically controlled valve opens and closes, no oil pressure alarm is triggered when the difference in real-time oil pressure before and after the electronically controlled valve opens and closes exceeds a preset oil pressure threshold. The PCJ solenoid valve is controlled to open, and the opening degree of the electronically controlled valve is controlled so that the real-time oil pressure does not exceed a preset upper limit oil pressure. This further improves the accuracy of blockage detection in the engine lubrication system diagnostic results, while avoiding over-protection situations to improve the vehicle's driving experience.

[0091] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the oil pressure alarm diagnosis method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0092] This application also provides an oil pressure alarm and diagnostic device; please refer to [reference needed]. Figure 6 The oil pressure alarm diagnostic device includes:

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

[0094] The status judgment module 20 is used to determine whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold.

[0095] The status judgment module 20 is used to determine 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 also used to control the electronic control 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 opening and closing. When the difference between the real-time oil pressure before and after the electronically controlled valve is opening and closing does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered.

[0098] Optionally, the state judgment module 20 is further configured 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 the 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 also used 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 further configured to control the PCJ solenoid valve to close and control the engine to operate at low to medium load 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 closes exceeds the preset oil pressure threshold.

[0101] Optionally, the status judgment module 20 is also used to not issue an oil pressure alarm when the real-time oil pressure re-collected after the PCJ solenoid valve is closed does not exceed the preset oil pressure threshold.

[0102] Optionally, the fault alarm module 30 is also used to collect 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 opening and closing exceeds a preset oil pressure threshold, no oil pressure alarm is triggered.

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

[0104] The oil pressure alarm diagnostic device provided in this application, employing the oil pressure alarm diagnostic method described in the above embodiments, can solve the technical problem of inaccurate engine oil pressure diagnosis caused by the oil pressure sensor's inability to accurately report oil circuit faults. Compared with the prior art, the beneficial effects of the oil pressure alarm diagnostic device provided in this application are the same as those of the oil pressure alarm diagnostic method provided in the above embodiments, and other technical features in the oil pressure alarm diagnostic device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0105] This application provides an oil pressure alarm diagnostic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the oil pressure alarm diagnostic method in the above embodiment 1.

[0106] The following is for reference. Figure 7 The diagram illustrates a structural schematic suitable for implementing the oil pressure alarm diagnostic device in the embodiments of this application. The oil pressure alarm diagnostic device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 7 The oil pressure alarm diagnostic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of this application.

[0107] like Figure 7 As shown, the oil pressure alarm diagnostic device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the oil pressure alarm diagnostic device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows the oil pressure alarm diagnostic device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows oil pressure alarm diagnostic devices with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0108] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0109] The oil pressure alarm diagnostic device provided in this application, employing the oil pressure alarm diagnostic method described in the above embodiments, can solve the technical problem of inaccurate engine oil pressure diagnosis caused by the oil pressure sensor's inability to accurately report oil circuit faults. Compared with the prior art, the beneficial effects of the oil pressure alarm diagnostic device provided in this application are the same as those of the oil pressure alarm diagnostic method provided in the above embodiments, and other technical features of this oil pressure alarm diagnostic device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0110] It should be understood that the various parts disclosed in this application can be implemented using 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 suitable manner in one or more embodiments or examples.

[0111] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0112] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the oil pressure alarm diagnosis method in the above embodiments.

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

[0114] The aforementioned computer-readable storage medium may be included in the oil pressure alarm diagnostic device; or it may exist independently and not be assembled into the oil pressure alarm diagnostic device.

[0115] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0116] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0117] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0118] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described oil pressure alarm diagnosis method. This solves the technical problem of inaccurate engine oil pressure diagnosis caused by the oil pressure sensor's inability to accurately report oil circuit faults. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the oil pressure alarm diagnosis method provided in the above embodiments, and will not be elaborated upon here.

[0119] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for diagnosing engine oil pressure alarms, characterized in that, The oil pressure alarm diagnostic method includes: Obtain the real-time and target oil pressure of the engine lubrication system; Determine 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, 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 electronically controlled valve is opened and closed. The real-time oil pressure is collected when the electronically controlled valve is opening and closing. When the difference between the real-time oil pressure before and after the opening and closing of the electronically controlled valve does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered. 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, the real-time oil pressure is compared with a preset lower limit oil pressure; When the real-time oil pressure is less than the preset lower limit oil pressure, the VVT ​​angle at the end of the engine oil circuit is controlled to change. Obtain the actual angle and target angle of VVT; An oil pressure alarm is triggered when the difference between the actual angle and the target angle exceeds a preset angle threshold.

2. The oil pressure alarm diagnosis method as described in claim 1, characterized in that, After the step of obtaining the actual angle and target angle of 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 malfunction alarm is triggered.

3. The oil pressure alarm diagnosis method as described in claim 1, 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 closed and the engine is controlled to operate at low to medium load. When the real-time oil pressure re-collected after the PCJ solenoid valve is closed exceeds the preset oil pressure threshold, an oil pressure alarm is triggered.

4. The oil pressure alarm diagnosis method as described in claim 3, characterized in that, After the step of controlling the PCJ solenoid valve to close and controlling the engine to operate at low load when the real-time oil pressure is greater than the preset lower limit oil pressure, the method further includes: If 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 will be triggered.

5. The oil pressure alarm diagnosis method as described in claim 1, characterized in that, The step of collecting the real-time oil pressure when the electronically controlled valve is opening and closing, and issuing an oil pressure alarm when the difference in real-time oil pressure before and after the opening and closing of the electronically controlled valve does not exceed a preset oil pressure threshold, further includes: The real-time oil pressure is collected when the electronically controlled valve is opening and closing. If the difference between the real-time oil pressure before and after the electronically controlled valve is opening and closing exceeds a preset oil pressure threshold, no oil pressure alarm is triggered.

6. The oil pressure alarm diagnosis method as described in claim 5, characterized in that, After the step of collecting the real-time oil pressure when the electronically controlled valve opens and closes, and not triggering an oil pressure alarm when the difference in real-time oil pressure before and after the opening and closing of the electronically controlled valve exceeds a preset oil pressure threshold, the method further includes: Control the opening of the PCJ solenoid valve and control the opening degree of the electronically controlled valve until the real-time oil pressure does not exceed the preset upper limit oil pressure.

7. An oil pressure alarm and diagnostic device, characterized in that, The device includes: The information acquisition module is used to acquire the real-time oil pressure and target oil pressure of the engine lubrication system; The status judgment module is used to determine whether the oil pressure difference between the real-time oil pressure and the target oil pressure exceeds a preset alarm threshold. The status judgment module is used to determine whether the real-time oil pressure is greater than the target oil pressure when the oil pressure difference exceeds the preset alarm threshold. The status judgment module is also 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 electronically controlled valve is opening and closing. When the difference between the real-time oil pressure before and after the electronically controlled valve is opening and closing does not exceed the preset oil pressure threshold, an oil pressure alarm is triggered. The status judgment module is further configured 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.

8. An oil pressure alarm and diagnostic device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the oil pressure alarm diagnostic method as described in any one of claims 1 to 6.

9. 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, it implements the steps of the oil pressure alarm diagnosis method as described in any one of claims 1 to 6.

Images