Classified dynamic control method and system for fault mode of oil pump

Abstract

The invention provides a hierarchical dynamic control method and system for an oil pump fault mode, and the method comprises the steps: monitoring an actual oil pressure signal and a plurality of working condition parameter signals of an engine in real time, and carrying out the calculation based on the plurality of working condition parameter signals to obtain a target oil pressure signal; the difference value between the actual engine oil pressure signal and the target engine oil pressure signal is calculated, and whether the difference value is larger than a preset abnormal threshold value or not is judged; if the abnormal value is larger than the preset abnormal threshold value, it is judged that the oil pressure of the engine is abnormal, and whether the oil pressure abnormity belongs to the emergency situation or not is further judged; if the condition does not belong to the emergency condition, triggering early warning of a corresponding level according to the value of the difference value; if the non-highest-level early warning is triggered, the oil pressure state is detected again after preset time, and if the oil pressure is abnormal and still not recovered, a specific fault mode is diagnosed; and according to the diagnosed fault mode, the corresponding preset control strategy is called to control the fully variable oil pump, and the misjudgment rate is reduced.

Description

Technical Field

[0001] This invention belongs to the field of oil pump control technology, specifically relating to a hierarchical dynamic control method and system for oil pump failure modes. Background Technology

[0002] The fully variable oil pump is a core component of modern engine lubrication systems. Its core function is to dynamically adjust the oil supply and pressure according to different engine operating conditions, which is of great significance for ensuring engine lubrication, improving fuel economy, and reducing emissions. However, traditional fully variable oil pump control strategies have obvious drawbacks, mainly in their over-reliance on a single signal, which seriously affects the engine's operational reliability and energy efficiency.

[0003] In existing technologies, control systems primarily rely on a single signal from an oil pressure sensor for feedback regulation. This architecture, heavily reliant on a single signal source, lacks sufficient identification and fault tolerance for sensor malfunctions (such as short circuits or signal drift) or external interference (such as electromagnetic noise or transient signal anomalies caused by mechanical vibration). For example, when a pressure sensor continuously outputs a signal lower than its actual value due to an internal malfunction, the system is highly susceptible to misinterpreting this "sensor malfunction" as "insufficient actual oil pressure," thus triggering unnecessary protective actions. Furthermore, because it does not integrate multi-dimensional operating condition information such as engine speed, load, and coolant temperature for comprehensive judgment, the system cannot accurately identify normal pressure fluctuations under different environments. For instance, during cold starts at low temperatures, the high viscosity and flow resistance of the oil result in slow oil pressure build-up, which is normal, but traditional strategies may misinterpret this as a malfunction. Under high-temperature and high-load conditions, the oil pressure demand changes rapidly, and the single-signal regulation mode exhibits a lag in response, further exacerbating the risk of misjudgment and control deviation. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a graded dynamic control method and system for oil pump failure modes, which solves the technical problems in the prior art.

[0005] On the one hand, the invention provides the following technical solution: a hierarchical dynamic control method for oil pump failure modes, the method comprising:

[0006] The engine's actual oil pressure signal and multiple operating condition parameter signals are monitored in real time, and the target oil pressure signal is calculated based on the multiple operating condition parameter signals.

[0007] Calculate the difference between the actual oil pressure signal and the target oil pressure signal, and determine whether the difference is greater than a preset abnormal threshold.

[0008] If the oil pressure exceeds the preset abnormal threshold, the engine is determined to have an oil pressure abnormality, and it is further determined whether the oil pressure abnormality belongs to an emergency.

[0009] If it is not an emergency, an alert of the corresponding level will be triggered based on the magnitude of the difference.

[0010] If a warning other than the highest level is triggered, the oil pressure status will be checked again after a predetermined time. If the oil pressure abnormality has not been resolved, the specific fault mode will be diagnosed.

[0011] Based on the diagnosed fault mode, the corresponding preset control strategy is invoked to control the fully variable oil pump.

[0012] Compared to existing technologies, the advantages of this application are as follows: by fusing multiple operating parameters with the oil pressure signal for judgment, it replaces the traditional strategy of relying solely on the oil pressure sensor. This enables the system to effectively distinguish between "actual oil pressure abnormality" and "sensor malfunction or signal interference," eliminating unnecessary emergency modes triggered by sensor false alarms at the source and greatly reducing the false judgment rate.

[0013] Furthermore, the step of determining whether the abnormal oil pressure constitutes an emergency includes:

[0014] Determine whether the actual oil pressure signal is below the emergency pressure threshold in multiple consecutive sampling periods;

[0015] If so, it is determined to be an emergency, and the emergency shutdown control procedure is initiated.

[0016] Furthermore, the steps for triggering the corresponding level of warning include:

[0017] Multiple warning thresholds are preset, and the difference is compared with the multiple warning thresholds;

[0018] When the difference exceeds the third warning threshold, a level three warning is triggered, and the engine is forced to shut down.

[0019] When the difference is greater than the second warning threshold and less than the third warning threshold, a level two warning is triggered, an enhanced alarm is issued, and engine torque output is limited.

[0020] When the difference is greater than the first warning threshold and less than the second warning threshold, a level one warning is triggered, and only instrument prompts are given.

[0021] Furthermore, the failure modes include at least sensor or circuit failures and pump body mechanical jamming failures.

[0022] Furthermore, the invocation of the corresponding preset control strategy includes:

[0023] If the fault mode is a sensor or circuit fault, the backup oil pressure MAP based on engine speed and load is activated, the target oil pressure is calculated, and the control signal of the oil pump is adjusted according to the target oil pressure.

[0024] If the fault mode is mechanical jamming, the fully variable oil pump will be switched to mechanical pressure limiting mode.

[0025] Furthermore, the control signal of the target oil pressure regulator oil pump further includes:

[0026] Determine whether the target oil pressure value is in a high oil pressure state or a low oil pressure state relative to the expected oil pressure under the current operating conditions;

[0027] If the target oil pressure is high, the corresponding oil pump control duty cycle is calculated. If the duty cycle is within the preset reasonable range, it is adjusted according to that value. If it exceeds the reasonable range, the oil pump is controlled to run at the maximum duty cycle.

[0028] If the target oil pressure is low, the engine will be subjected to step-by-step torque limiting control.

[0029] Furthermore, when the backup oil pressure MAP is activated, if the water temperature signal is valid, the calculated target oil pressure value is compensated and corrected using the water temperature signal.

[0030] Secondly, the invention provides the following technical solution: a graded dynamic control system for oil pump failure modes, the system comprising:

[0031] The calculation module is used to monitor the actual oil pressure signal and multiple operating condition parameter signals of the engine in real time, and calculate the target oil pressure signal based on the multiple operating condition parameter signals.

[0032] The judgment module is used to calculate the difference between the actual oil pressure signal and the target oil pressure signal, and to determine whether the difference is greater than a preset abnormal threshold.

[0033] An anomaly module is used to determine that the engine has an oil pressure anomaly if the pressure exceeds a preset anomaly threshold, and to further determine whether the oil pressure anomaly is an emergency.

[0034] The early warning module is used to trigger an early warning of the corresponding level based on the magnitude of the difference if it is not an emergency.

[0035] The diagnostic module is used to check the oil pressure status again after a predetermined time if a warning other than the highest level is triggered. If the oil pressure is still abnormal and has not recovered, the specific fault mode is diagnosed.

[0036] The control module is used to control the fully variable oil pump by calling the corresponding preset control strategy according to the diagnosed fault mode.

[0037] Thirdly, the invention provides the following technical solution: a computer, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the graded dynamic control method for oil pump failure modes as described above.

[0038] Fourthly, the invention provides the following technical solution: a storage medium storing a computer program, which, when executed by a processor, implements the graded dynamic control method for oil pump failure modes as described above. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart of a graded dynamic control method for oil pump failure modes according to the first embodiment of the present invention.

[0041] Figure 2 This is a logical schematic diagram of the graded dynamic control method for oil pump failure modes according to the first embodiment of the present invention;

[0042] Figure 3 This is a target oil pressure baseline MAP based on speed-torque according to the first embodiment of the present invention;

[0043] Figure 4 This is a target oil pressure correction MAP based on engine speed and oil temperature according to the first embodiment of the present invention;

[0044] Figure 5 This is a MAP diagram of the pre-controlled duty cycle based on speed-torque according to the first embodiment of the present invention;

[0045] Figure 6 This is a MAP diagram of the pre-controlled duty cycle correction based on speed-oil temperature according to the first embodiment of the present invention;

[0046] Figure 7 This is a structural block diagram of the graded dynamic control system for oil pump failure modes according to the second embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the hardware structure of a computer according to a third embodiment of the present invention.

[0048] The embodiments of the present invention will be further described below with reference to the accompanying drawings. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0050] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] Example 1

[0053] In the first embodiment of the present invention, please refer to Figure 1 and Figure 2 As shown, a hierarchical dynamic control method for oil pump failure modes includes the following steps S01 to S04:

[0054] S01, Real-time monitoring of the engine's actual oil pressure signal and multiple operating condition parameter signals, and calculation of the target oil pressure signal based on the multiple operating condition parameter signals;

[0055] In this embodiment, the ECU (Electronic Control Unit, Engine Control Unit) monitors the actual oil pressure signal of the engine in real time and simultaneously collects operating condition parameters such as engine speed, load, and coolant temperature. The ECU internally stores a baseline target oil pressure map based on engine speed and torque, and a corrected target oil pressure map based on engine speed and oil temperature. The ECU retrieves the baseline target pressure from the baseline map based on the current engine speed and load, and then retrieves the corrected value from the corrected map based on the current coolant temperature. Finally, it calculates the precise target oil pressure value (target oil pressure signal) under the current operating conditions using a formula (e.g., target pressure = baseline pressure × coolant temperature correction factor × altitude correction factor).

[0056] It is worth noting that the determination of the target oil pressure signal (operating condition identification) is achieved through a series of control MAPs (pulse maps) and correction algorithms preset in the engine control unit (ECU). The target oil pressure value is calculated based on the engine's real-time operating conditions to achieve precise on-demand oil supply. The specific steps are as follows:

[0057] 1. Basic target pressure query;

[0058] The ECU first queries a pre-stored "target oil pressure baseline MAP based on speed-torque" (see [reference]) based on the collected engine speed and engine load (such as torque request or throttle opening) signals. Figure 3 This yields a basic target oil pressure value. The MAP (Modular Mapping) chart defines the optimal oil pressure required for various engine operating points under standard conditions (such as specific water temperature and altitude).

[0059] 2. Target pressure adjustment;

[0060] To adapt to complex operating environments, the ECU also needs to compensate for and correct the basic target pressure. The main correction factors include:

[0061] Coolant temperature correction: The ECU queries the "Target oil pressure correction MAP based on engine speed and oil temperature" (see...) based on the coolant temperature signal. Figure 4 The MAP provides pressure correction factors at different water temperatures. As a preferred embodiment, the correction strategy is as follows: for every 10°C increase in oil temperature, the target pressure value is reduced by 5%. The target pressure is increased at low temperatures to overcome oil viscous resistance, and decreased at high temperatures to avoid redundant power consumption.

[0062] Altitude correction: The ECU can indirectly obtain altitude information based on the intake air pressure sensor signal and perform compensation. As a preferred embodiment, the correction strategy is as follows: for every 1000 meters increase in altitude, the target pressure value is reduced by 3% to compensate for the impact of atmospheric pressure reduction on the oil pump's suction capacity.

[0063] 3. Control signal output;

[0064] Finally, the ECU performs comprehensive calculations to obtain the precise target oil pressure value. To control the oil pump to reach this target pressure, the ECU performs the following operations:

[0065] Pre-load duty cycle query: ECU query "Pre-load duty cycle MAP based on speed-torque" (see...) Figure 5 This yields a basic control duty cycle signal.

[0066] Duty cycle correction: The ECU then queries the "Pre-control Duty Cycle Correction MAP Based on Speed-Oil Temperature" (see...) based on the coolant temperature signal. Figure 6 The system corrects the base duty cycle and ultimately outputs a precise pulse width modulation (PWM) signal to the solenoid valve of the fully variable oil pump, thereby achieving dynamic and precise adjustment of the oil pump displacement.

[0067] Through the above-mentioned strategy of multi-MAP diagram collaboration and multi-parameter correction, this invention enables oil pressure control to adapt to various complex operating conditions of the engine, laying a solid foundation for achieving efficient and precise lubrication control, and also serving as the benchmark for subsequent fault diagnosis logic to judge "abnormal oil pressure".

[0068] S02, calculate the difference between the actual oil pressure signal and the target oil pressure signal, and determine whether the difference is greater than a preset abnormal threshold.

[0069] The ECU calculates the difference between the actual oil pressure and the target oil pressure (i.e., pressure deviation). This difference is compared to a dynamic anomaly threshold MAP, which varies with engine speed and load to accommodate normal pressure fluctuations under different operating conditions. If the difference exceeds the dynamic threshold, the oil pressure is determined to be abnormal.

[0070] S03, if the oil pressure exceeds the preset abnormal threshold, the engine is determined to have an oil pressure abnormality, and it is further determined whether the oil pressure abnormality is an emergency.

[0071] Specifically, the steps for determining whether the abnormal oil pressure constitutes an emergency include:

[0072] Determine whether the actual oil pressure signal is below the emergency pressure threshold in multiple consecutive sampling periods;

[0073] If so, it is determined to be an emergency, and the emergency shutdown control procedure is initiated.

[0074] In this embodiment, after determining that the oil pressure is abnormal, the ECU first determines whether it is an emergency. The determination condition is that the actual oil pressure is below 0.15 MPa for three consecutive sampling cycles (the sampling cycle is, for example, 10 ms). If this condition is met, it is determined to be an emergency (such as severe oil shortage), and the ECU will immediately trigger the emergency shutdown procedure. This procedure includes lubrication system purging logic to prevent engine damage due to oil shortage.

[0075] In the event of an emergency, the ECU immediately activates the fuel injection system to stop fuel injection and shut down the engine. To prevent residual oil from coking on high-temperature components, the ECU will control the oil pump to continue running at maximum capacity for 20 seconds before shutting down to drain the oil from the main lubrication system oil passages, reducing the risk of secondary damage and providing good conditions for subsequent maintenance and starting.

[0076] S04, If it is not an emergency, then trigger the corresponding level of warning based on the magnitude of the difference;

[0077] Specifically, the steps for triggering the corresponding level of warning include:

[0078] Multiple warning thresholds are preset, and the difference is compared with the multiple warning thresholds;

[0079] When the difference exceeds the third warning threshold, a level three warning is triggered, and the engine is forced to shut down.

[0080] When the difference is greater than the second warning threshold and less than the third warning threshold, a level two warning is triggered, an enhanced alarm is issued, and engine torque output is limited.

[0081] When the difference is greater than the first warning threshold and less than the second warning threshold, a level one warning is triggered, and only instrument prompts are given.

[0082] In this embodiment, if it is not an emergency, a graded warning is triggered based on the magnitude of the pressure deviation:

[0083] Level 1 warning (deviation > 10%): The ECU sends a command via the CAN bus to illuminate the yellow warning light on the instrument panel to alert the driver, but does not limit engine power.

[0084] Level 2 warning (deviation > 20%): The ECU triggers a buzzer alarm and simultaneously limits the engine torque output to 50% of the current state (i.e., torque limit 50%) to reduce engine load and lubrication requirements.

[0085] Level 3 warning (deviation > 30%): The ECU directly controls the engine to force a shutdown in order to avoid serious mechanical wear accidents.

[0086] Specifically, the failure modes include at least sensor or circuit failure and pump body mechanical jamming failure.

[0087] S05 If a warning that is not of the highest level is triggered, the oil pressure status will be checked again after a predetermined time. If the oil pressure is still abnormal and has not recovered, the specific fault mode will be diagnosed.

[0088] In this embodiment, to avoid misjudgment due to momentary interference, the system does not immediately perform fault diagnosis after triggering a level one or level two warning. Instead, it enters a 5-second delayed diagnosis period. During this period, the system continuously monitors the oil pressure status. If the pressure returns to normal within 5 seconds, the warning is exited; if the abnormality persists after 5 seconds, the fault diagnosis process is initiated.

[0089] S06, based on the diagnosed fault mode, invoke the corresponding preset control strategy to control the fully variable oil pump.

[0090] Specifically, the invocation of the corresponding preset control strategy includes:

[0091] If the fault mode is a sensor or circuit fault, the backup oil pressure MAP based on engine speed and load is activated, the target oil pressure is calculated, and the control signal of the oil pump is adjusted according to the target oil pressure.

[0092] If the fault mode is mechanical jamming, the fully variable oil pump will be switched to mechanical pressure limiting mode.

[0093] More specifically, the control signal of the oil pump based on the target oil pressure regulator further includes:

[0094] Determine whether the target oil pressure value is in a high oil pressure state or a low oil pressure state relative to the expected oil pressure under the current operating conditions;

[0095] If the target oil pressure is high, the corresponding oil pump control duty cycle is calculated. If the duty cycle is within the preset reasonable range, it is adjusted according to that value. If it exceeds the reasonable range, the oil pump is controlled to run at the maximum duty cycle.

[0096] If the target oil pressure is low, the engine will be subjected to step-by-step torque limiting control.

[0097] More specifically, when the backup oil pressure MAP is activated, if the water temperature signal is valid, the calculated target oil pressure value is compensated and corrected using the water temperature signal.

[0098] In this embodiment, the ECU diagnoses persistent oil pressure abnormalities, distinguishes fault modes, and invokes different strategies:

[0099] a) Diagnosis of sensor or circuit fault: The ECU discards the current oil pressure sensor signal and activates a backup oil pressure map. This map takes engine speed and load as input and outputs a conservative, safe target oil pressure value. If the coolant temperature signal is valid, it is used to compensate for and correct the target value (e.g., the target value decreases by 5% for every 10°C increase in oil temperature). Then, the ECU uses this target value to deduce and output a duty cycle signal to control the oil pump. To ensure safety, the ECU compares this duty cycle with a preset safe range (e.g., 5%–95%); if it exceeds this range, it limits operation to the maximum or minimum value. Simultaneously, to compensate for insufficient accuracy in open-loop control, a progressive torque limiting operation is implemented.

[0100] b) Diagnosis of pump body mechanical jamming or other mechanical failure: The ECU determines that the electronic regulation has failed and outputs a signal to switch the oil pump to mechanical pressure limiting mode. At this time, the mechanical pressure limiting valve inside the oil pump starts to work, maintaining the oil pressure at an acceptable minimum level (for example, maintaining the oil pressure not lower than 0.7MPa when the water temperature is 100°C), providing the most basic lubrication guarantee for the engine.

[0101] c) Other unidentified faults: Return to oil pressure deviation judgment and continue dynamic adjustment through three-level early warning.

[0102] In an alternative embodiment, the handling details for high oil pressure and low oil pressure states are as follows:

[0103] After activating the backup MAP, the ECU will compare the calculated target oil pressure value with the theoretical expected oil pressure range under the current operating conditions to determine whether the system is in a "high oil pressure state" or a "low oil pressure state".

[0104] If the oil pressure is high: the ECU suspects there may be overshoot or poor oil return path. It will calculate a smaller control duty cycle and check if the duty cycle is reasonable. If reasonable, it will be used for adjustment; if unreasonable (e.g., the calculated value is less than 5%), it will operate with a preset minimum safe duty cycle (e.g., 5%) to prevent the oil pump from shutting off completely.

[0105] If the oil pressure is low: the ECU considers insufficient oil supply to be the primary issue. While maintaining backup MAP control, it will implement a more aggressive, step-by-step torque limiting strategy (such as starting directly from 50% torque limiting) to reduce engine load more quickly and match the reduced lubrication supply capacity.

[0106] Among them, the fault diagnosis and protection logic is as follows:

[0107] Fault diagnosis upgrade: Establish hierarchical anomaly identification logic to distinguish between interference, faults, and actual pressure fluctuations.

[0108] Control mode redundancy: Design a multi-mode switching strategy to dynamically adjust the control logic according to the fault level.

[0109] Enhanced safety protection: Multiple protection thresholds are set to prevent engine damage caused by excessively low oil pressure.

[0110] Sensor failure: If the sensor / circuit fails, the calculation will be performed using 100°C by default, and open-loop control (oil pump 5% PWM) will be activated.

[0111] Actuator failure: If the solenoid valve drive circuit is short-circuited and the control logic is disordered, the oil should immediately cut off the power and switch to the mechanical emergency mode (minimum displacement to maintain lubrication);

[0112] Insufficient actual oil level / other mechanical failure: Set upper and lower pressure limits, and force shutdown protection when the pressure exceeds the range.

[0113] In summary, the hierarchical dynamic control method for oil pump failure modes has the following effects:

[0114] 1. By fusing multiple operating parameters such as engine speed, load, and coolant temperature with oil pressure signals for judgment, the system replaces the traditional strategy of relying solely on an oil pressure sensor. This allows the system to effectively distinguish between "actual oil pressure anomaly" and "sensor malfunction or signal interference," eliminating unnecessary emergency modes triggered by sensor false alarms and greatly reducing the misjudgment rate.

[0115] 2. A 5-second delay in diagnosis is introduced through a delayed diagnosis mechanism. For non-urgent anomalies, the system will not act immediately but will continue to observe. This design effectively filters out signal jumps caused by electromagnetic interference, vibration, or instantaneous operating condition fluctuations, avoiding frequent false alarms and mishandling, and improving the system's anti-interference capability and diagnostic accuracy.

[0116] 3. By establishing a three-level early warning mechanism (alert, torque limiting, and shutdown), the traditional "one-size-fits-all" approach has been changed. The system can apply appropriate control commands based on the severity of the oil pressure deviation. For minor anomalies, only an alert is issued, without affecting normal vehicle use and uptime; for moderate anomalies, an alarm is issued while torque is limited to reduce risk, providing the driver with a buffer time to safely stop the vehicle; and a forced shutdown is only implemented in the most severe cases. This ensures safety while minimizing efficiency losses and availability degradation caused by over-processing.

[0117] 4. By categorizing faults into "sensor / circuit faults" and "pump mechanical faults," completely different handling strategies are adopted. For sensor / circuit faults, a backup MAP is activated for intelligent fault-tolerant control, enabling the system to continue supplying fuel as needed even after sensor failure, avoiding the 3%-5% redundant fuel consumption caused by directly switching to the maximum displacement mechanical mode in traditional strategies. For pump mechanical faults, the system switches to mechanical pressure-limiting mode as a final safety net. This targeted approach fundamentally solves the problem of ineffective high energy consumption caused by the inability to distinguish fault types in traditional methods.

[0118] 5. In the emergency shutdown procedure, a purging step of "the oil pump continues to run for 20 seconds" has been added. This innovative detail can drain the high-temperature residual oil in the lubrication system, effectively preventing it from coking and forming carbon deposits after shutdown. This avoids secondary wear problems such as cylinder scoring and bearing damage caused by hard particles when the engine is started again, thus improving the engine's durability and reliability.

[0119] 6. By combining intelligent backup MAP (software redundancy) and hardware mechanical pressure limiting mode (hardware redundancy), the engine is guaranteed to receive basic lubrication protection under any fault mode, greatly improving the engine's safety under extreme operating conditions.

[0120] 7. The MAP-based control strategy and various correction compensations (such as water temperature and altitude) enable the system to adapt to the oil pressure requirements under different environments and operating conditions. Whether under cold start, high temperature, high altitude or heavy load conditions, it can maintain precise control and improve the environmental adaptability and operational stability of the vehicle.

[0121] 8. By reducing misjudgments, avoiding unnecessary mechanical pressure limiting mode operation, and achieving more precise on-demand oil supply, this invention can effectively reduce the operating power consumption of the oil pump, thereby contributing to reducing the overall fuel consumption of the engine and improving the economy of the vehicle.

[0122] By introducing a three-level early warning mechanism and combining it with a 5-second delay diagnostic logic, the system can effectively filter instantaneous interference signals, significantly reduce the probability of misjudgment caused by sensor false alarms, and fundamentally solve the inherent defect of traditional control strategies that rely too much on a single signal.

[0123] A segmented handling strategy is implemented for different fault modes (such as circuit / sensor failure and pump jamming), abandoning the traditional single mechanical emergency mode. Specifically, a backup MAP is activated to maintain operation in the event of sensor failure, and a mechanical pressure limiting mode is switched in the event of pump jamming. This strategy avoids unnecessary redundant power consumption.

[0124] In emergency situations, a 20-second purging logic has been added to run the oil pump continuously before emergency shutdown to prevent secondary damage caused by residual oil in the lubrication system. Meanwhile, a tiered warning mechanism can match differentiated measures based on the severity of the fault, preventing over-treatment of minor anomalies to ensure vehicle availability, and triggering protection in a timely manner to ensure engine safety in the event of a serious fault.

[0125] Based on a closed-loop control logic that integrates multiple parameters dynamically, the system shifts from passive response to active adjustment. This allows the system to maintain target oil pressure more precisely under various complex operating conditions, thereby significantly improving engine stability and overall reliability.

[0126] Example 2

[0127] like Figure 7 As shown, a second embodiment of the present invention provides a graded dynamic control system for oil pump failure modes, the system comprising:

[0128] The calculation module 10 is used to monitor the actual oil pressure signal and multiple operating condition parameter signals of the engine in real time, and calculate the target oil pressure signal based on the multiple operating condition parameter signals.

[0129] The judgment module 20 is used to calculate the difference between the actual oil pressure signal and the target oil pressure signal, and to determine whether the difference is greater than a preset abnormal threshold.

[0130] Anomaly module 30 is used to determine that the engine has an oil pressure abnormality if the oil pressure exceeds a preset abnormality threshold, and further determine whether the oil pressure abnormality belongs to an emergency.

[0131] The early warning module 40 is used to trigger an early warning of the corresponding level based on the magnitude of the difference if it is not an emergency.

[0132] The diagnostic module 50 is used to re-check the oil pressure status after a predetermined time if a non-highest level warning is triggered. If the oil pressure abnormality has not been recovered, the specific fault mode is diagnosed.

[0133] The control module 60 is used to control the fully variable oil pump by calling the corresponding preset control strategy according to the diagnosed fault mode.

[0134] The hierarchical dynamic control system for oil pump failure modes provided in this embodiment of the invention has the same implementation principle and technical effects as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the system embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0135] Example 3

[0136] like Figure 8As shown, in the third embodiment of the present invention, the present invention provides the following technical solution: a computer, including a memory 202, a processor 201, and a computer program stored in the memory 202 and executable on the processor 201, wherein the processor 201 executes the computer program to implement the graded dynamic control method for oil pump failure modes as described above.

[0137] Specifically, the processor 201 may include a central processing unit, a specific integrated circuit, or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0138] Memory 202 may include a large-capacity memory for data or instructions. For example, and not limitingly, memory 202 may include a hard disk drive, floppy disk drive, solid-state drive, flash memory, optical disk drive, magneto-optical disk drive, magnetic tape drive, or Universal Serial Bus drive, or a combination of two or more of these. Where appropriate, memory 202 may include removable or non-removable media. Where appropriate, memory 202 may be internal or external to a data processing device. In a particular embodiment, memory 202 is non-volatile memory. In a particular embodiment, memory 202 includes read-only memory and random access memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM, an erasable PROM, an electrically erasable PROM, an electrically rewritable ROM, or flash memory, or a combination of two or more of these. Where appropriate, the RAM may be static random access memory (SRAM) or dynamic random access memory (DRAM), wherein DRAM may be fast page-mode DRAM, extended data output DRAM, synchronous DRAM, etc.

[0139] The memory 202 can be used to store or cache various data files that need to be processed and / or communicated, as well as possible computer program instructions executed by the processor 201.

[0140] The processor 201 reads and executes the computer program instructions stored in the memory 202 to implement the above-mentioned graded dynamic control method for oil pump failure modes.

[0141] In some embodiments, the computer may further include a communication interface 203 and a bus 200. For example, Figure 8 As shown, the processor 201, memory 202, and communication interface 203 are connected through bus 200 and complete communication with each other.

[0142] The communication interface 203 is used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. The communication interface 203 can also enable data communication with other components such as external devices, image / data acquisition devices, databases, external storage, and image / data processing workstations.

[0143] Bus 200 includes hardware, software, or both, that couples computer components together. Bus 200 includes, but is not limited to, at least one of the following: data bus, address bus, control bus, expansion bus, local bus. For example, and not limitingly, bus 200 may include a graphics acceleration interface or other graphics bus, an enhanced industry standard architecture bus, a front-side bus, HyperTransport interconnect, an industry standard architecture bus, a wireless bandwidth interconnect, a low pin count bus, a memory bus, a WeChat architecture bus, a peripheral component interconnect bus, a PCI Express bus, a Serial Advanced Technology Attached Bus, a Video Electronics Standards Association local bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 200 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0144] Example 4

[0145] In the fourth embodiment of the present invention, in conjunction with the above-described hierarchical dynamic control method for oil pump failure modes, the present invention provides the following technical solution: a storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the above-described hierarchical dynamic control method for oil pump failure modes.

[0146] Those skilled in the art will understand that the data in the flowchart, or logic and / or steps otherwise described herein, for example, can be considered as a sequenced data table of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device. For the purposes of this specification, "computer-readable medium" can mean any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0147] More specific examples of readable media include: electrical connections with one or more wires, portable computer disk drives, random access memory, read-only memory, erasable and editable read-only memory, fiber optic devices, and portable optical disc read-only memory. Additionally, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0148] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0149] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0150] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hierarchical dynamic control method for oil pump failure modes, characterized in that, The method includes: The engine's actual oil pressure signal and multiple operating condition parameter signals are monitored in real time, and the target oil pressure signal is calculated based on the multiple operating condition parameter signals. Calculate the difference between the actual oil pressure signal and the target oil pressure signal, and determine whether the difference is greater than a preset abnormal threshold. If the oil pressure exceeds the preset abnormal threshold, the engine is determined to have an oil pressure abnormality, and it is further determined whether the oil pressure abnormality belongs to an emergency. If it is not an emergency, an alert of the corresponding level will be triggered based on the magnitude of the difference. If a warning other than the highest level is triggered, the oil pressure status will be checked again after a predetermined time. If the oil pressure abnormality has not been resolved, the specific fault mode will be diagnosed. Based on the diagnosed fault mode, the corresponding preset control strategy is invoked to control the fully variable oil pump.

2. The graded dynamic control method for oil pump failure modes according to claim 1, characterized in that, The steps for determining whether the abnormal oil pressure constitutes an emergency include: Determine whether the actual oil pressure signal is below the emergency pressure threshold in multiple consecutive sampling periods; If so, it is determined to be an emergency, and the emergency shutdown control procedure is initiated.

3. The graded dynamic control method for oil pump failure modes according to claim 1, characterized in that, The steps for triggering the corresponding level of warning include: Multiple warning thresholds are preset, and the difference is compared with the multiple warning thresholds; When the difference exceeds the third warning threshold, a level three warning is triggered, and the engine is forced to shut down. When the difference is greater than the second warning threshold and less than the third warning threshold, a level two warning is triggered, an enhanced alarm is issued, and engine torque output is limited. When the difference is greater than the first warning threshold and less than the second warning threshold, a level one warning is triggered, and only instrument prompts are given.

4. The graded dynamic control method for oil pump failure modes according to claim 1, characterized in that, The failure modes include at least sensor or circuit failures and pump body mechanical jamming failures.

5. The graded dynamic control method for oil pump failure modes according to claim 1, characterized in that, The invocation of the corresponding preset control strategy includes: If the fault mode is a sensor or circuit fault, the backup oil pressure MAP based on engine speed and load is activated, the target oil pressure is calculated, and the control signal of the oil pump is adjusted according to the target oil pressure. If the fault mode is mechanical jamming, the fully variable oil pump will be switched to mechanical pressure limiting mode.

6. The graded dynamic control method for oil pump failure modes according to claim 5, characterized in that, The control signal of the target oil pressure regulator oil pump, based on the target oil pressure regulator oil pump, further includes: Determine whether the target oil pressure value is in a high oil pressure state or a low oil pressure state relative to the expected oil pressure under the current operating conditions; If the target oil pressure is high, the corresponding oil pump control duty cycle is calculated. If the duty cycle is within the preset reasonable range, it is adjusted according to that value. If it exceeds the reasonable range, the oil pump is controlled to run at the maximum duty cycle. If the target oil pressure is low, the engine will be subjected to step-by-step torque limiting control.

7. The graded dynamic control method for oil pump failure modes according to claim 5, characterized in that, When the backup oil pressure MAP is activated, if the water temperature signal is valid, the calculated target oil pressure value is compensated and corrected using the water temperature signal.

8. A hierarchical dynamic control system for oil pump failure modes, characterized in that, The system includes: The calculation module is used to monitor the actual oil pressure signal and multiple operating condition parameter signals of the engine in real time, and calculate the target oil pressure signal based on the multiple operating condition parameter signals. The judgment module is used to calculate the difference between the actual oil pressure signal and the target oil pressure signal, and to determine whether the difference is greater than a preset abnormal threshold. An anomaly module is used to determine that the engine has an oil pressure anomaly if the pressure exceeds a preset anomaly threshold, and to further determine whether the oil pressure anomaly is an emergency. The early warning module is used to trigger an early warning of the corresponding level based on the magnitude of the difference if it is not an emergency. The diagnostic module is used to check the oil pressure status again after a predetermined time if a warning other than the highest level is triggered. If the oil pressure is still abnormal and has not recovered, the specific fault mode is diagnosed. The control module is used to control the fully variable oil pump by calling the corresponding preset control strategy according to the diagnosed fault mode.

9. A computer comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the hierarchical dynamic control method for oil pump failure modes as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the graded dynamic control method for oil pump failure modes as described in any one of claims 1 to 7.

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