A single-rotor engine main oil pump cooling and lubrication control system and control method
By using a single-rotor engine main oil pump cooling and lubrication control system, combined with closed-loop control of oil pressure sensors and metering valves, the problems of insufficient lubrication and unstable oil pressure of the rotor engine under complex operating conditions such as low-altitude aircraft have been solved, improving the reliability and durability of the system and enabling rapid adaptation to different operating conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HARBIN DONGAN AUTO ENGINE CO LTD
- Filing Date
- 2026-04-23
- Publication Date
- 2026-06-05
AI Technical Summary
Existing lubrication control methods for rotary engines are unreliable under complex operating conditions such as low-altitude aircraft, and cannot meet the protection requirements of critical components. They lack precise cooling and lubrication coordination control and metering valve quantitative control, resulting in insufficient lubrication, unstable oil pressure, and uncontrolled oil consumption, which affects the safety and durability of rotary engines.
The single-rotor engine main oil pump cooling and lubrication control system adopts closed-loop control through oil pressure sensors and metering valves, combined with CAN bus communication, to achieve hierarchical closed-loop control and full-dimensional monitoring and protection, ensuring stable oil pressure. The metering valve outputs according to the calibrated flow rate, and the maximum flow rate limit is set to build a dual redundancy protection mechanism to adapt to different operating conditions.
It improves the safety and stability of rotary engines under complex operating conditions, ensures the reliability and durability of the lubrication system, reduces maintenance costs, and enables rapid adaptability and efficient maintenance for different usage scenarios.
Smart Images
Figure CN122148412A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of rotary engine control technology, and in particular to a cooling and lubrication control system and method for a main oil pump of a single-rotor engine. Background Technology
[0002] Rotary engines utilize the eccentric motion of the rotor to achieve the working cycle of intake, compression, combustion, and exhaust. The components within the eccentric shaft, a core component, experience high sliding speeds, resulting in significant frictional forces on the friction surfaces. Wear on seals and cylinder block surfaces is particularly prominent, severely impacting the surface quality and geometric accuracy of the cylinder block structure, thus shortening the rotary engine's lifespan. To ensure reliable lubrication of all moving parts within the engine, current technology typically installs an oil pump in the lower engine housing. This pump applies pressure to the oil, delivering it to the surfaces of the friction components to form an oil film, achieving fluid friction. This reduces frictional resistance, alleviates component wear, and improves the engine's reliability and durability.
[0003] In existing technologies, the lubrication methods of most rotary engines can meet the basic usage requirements of ground or general-purpose power systems. However, when rotary engines are applied to low-altitude civil aircraft, small UAVs, and special equipment, the system's requirements for engine reliability and durability increase significantly. Since engine shutdowns or malfunctions due to hardware failures are unacceptable during flight, it is crucial to prioritize the protection of critical lubrication components to enhance their resilience and reliability. However, existing lubrication control methods lack precise cooling-lubrication coordination control and metering valve quantitative control logic, making them unsuitable for the complex operating conditions during low-altitude flight (such as attitude changes, sudden load changes, and high / low temperature environments). This makes it difficult to meet the dual requirements of precise lubrication and safety protection, resulting in problems such as insufficient lubrication, unstable oil pressure, and uncontrolled oil consumption, severely impacting the reliability of rotary engines in special scenarios. Summary of the Invention
[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a cooling and lubrication control system and control method for a single-rotor engine main oil pump.
[0005] To address the issues of insufficient reliability and inability to meet the protection requirements of critical components in existing rotary engine lubrication control methods under complex operating conditions such as low-altitude aircraft, as well as the lack of precise cooling and lubrication coordination control and metering valve quantitative control logic, which lead to insufficient lubrication, unstable oil pressure, and uncontrolled oil consumption, this invention provides a single-rotor engine main oil pump cooling and lubrication control system and method. By clarifying the coordination control logic of each component, optimizing the cooling and lubrication process, and improving the metering valve quantitative control and precise oil consumption ratio control scheme, this invention ensures that the internal components of the engine receive sufficient and precise lubrication and cooling, thereby improving the safety, stability, and durability of the rotary engine in complex operating environments.
[0006] The technical solution adopted in this invention is as follows: A cooling and lubrication control system for a single-rotor engine main oil pump includes: a main oil supply circuit, a metering lubrication branch circuit, a main oil pump, an oil pressure sensor, a metering valve, and an oil pressure switch. The oil pressure sensor is fixedly installed at the outlet end of the main oil pump, and the oil pressure switch is installed at the outlet end of the metering valve. The inlet end of the main oil pump is fixedly connected to the main oil supply circuit via an oil collector, and the metering lubrication branch circuit is fixedly connected to the inlet end of the metering valve. (Is the connection relationship at the highlighted position correct?) A control method for a main oil pump cooling and lubrication control system of a single-rotor engine, the method comprising the following steps: S1: System power-on initialization; S2: Main oil pump cooling and lubrication control; S3: Metering valve quantitative control; S4: Hydraulic pressure switch protection procedure; S5: System operation and monitoring, and oil consumption ratio control; S1 includes the following steps: S101: Automatically start the self-test process, sequentially test the CAN bus communication, oil pressure sensor, oil pressure switch, and metering valve drive module to confirm that each component is connected normally and is in good working condition; S102: Load preset calibration parameters, including main oil pump flow requirement table, main oil pump minimum speed table, metering valve flow requirement table, oil pressure speed table, and upper and lower limits of oil consumption ratio. S103: After the self-test passes, the system enters standby mode and waits for the engine start command.
[0007] S2 includes the following steps: S201: The control system collects engine speed in real time and obtains the target flow requirement of the main oil pump at the corresponding speed by querying the OILFLOWDEM_MAP calibration parameter table; S202: By adjusting the relevant calibration parameters, the minimum speed of the main oil pump is limited to avoid insufficient oil supply due to excessively low speed, which would fail to meet the cooling and lubrication requirements. S203: The control system outputs control commands via the CAN bus to drive the main oil pump to run at the target speed, drawing oil from the oil pan and pressurizing and delivering it. S204: The oil pressure sensor at the outlet of the main oil pump collects the actual oil pressure in real time and feeds the data back to the control system. The system compares and analyzes the actual oil pressure with the preset target oil pressure. S205: Automatically corrects the main oil pump speed requirement based on oil pressure deviation, outputs the corrected speed command, and drives the main oil pump to adjust the speed.
[0008] S3 includes the following steps: S301: The control system reads the OILDOSINGDEM_MAP calibration table and sets the target fuel supply based on the current engine speed, load and other operating parameters. S302: The control system converts the target oil supply into the driving frequency corresponding to the metering valve, and sets the flow limit to ensure that the maximum output flow of the metering valve does not exceed 99.4 cm³ / h, so as to avoid excessive oil consumption. S303: Outputs a control signal according to the converted drive frequency to drive the metering valve to operate; S304: The oil pressure data at the outlet of the metering valve is collected synchronously through the oil pressure switch to verify the working status of the metering valve. If the flow rate is abnormal, the drive frequency is adjusted in time.
[0009] S4 includes the following steps: S401: Low oil pressure: Triggers a low pressure alarm, indicating pipeline blockage, metering valve failure or insufficient oil supply. At the same time, it triggers the safety interlock, increases the main oil pump speed and adjusts the metering valve frequency. If the pressure remains too low, it triggers the engine to operate under reduced load. S402: Oil pressure too high: Triggers high pressure protection, limits the main oil pump speed, reduces oil output pressure, and shuts down if the pressure remains too high; S403: Oil pressure normal: The system continues to operate normally, and the oil pressure switch continuously monitors the oil pressure data and feeds it back to the control system in real time.
[0010] S5 includes the following steps: S501: Oil pressure continues to be abnormal for more than 5 seconds: This is determined to be a system overload or component failure, and a protective shutdown action is executed. S502: Metering valve frequency exceeds limit: Executes frequency limiting operation and triggers an alarm, prompting the operator to check the metering valve or calibration parameters; S503: CAN communication interruption: The system automatically enters safe mode and drives the main oil pump and metering valve at the preset minimum speed to maintain basic lubrication supply. S504: Abnormal oil consumption ratio: When the actual consumption ratio exceeds the preset upper and lower thresholds, the metering valve drive frequency is automatically corrected and the oil injection quantity is adjusted. S505: All parameters are normal: Return to the cycle monitoring state to continuously ensure the stable operation of the lubrication system.
[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. Layered closed-loop control: With "initialization-core control-protection monitoring" as the overall architecture, the main oil pump combines engine speed and calibration parameters to achieve basic lubrication control, and relies on oil pressure sensors to complete oil pressure closed-loop regulation to ensure oil pressure stability; the metering valve outputs at the calibrated flow rate and frequency, and sets the maximum flow limit. The control logic is clear and highly accurate, and at the same time, it realizes the coordinated closed loop of cooling and lubrication to improve control reliability. 2. Comprehensive monitoring and protection: Power-on self-test covers key components such as CAN bus communication, sensors, and drive modules to ensure normal startup of each component; during operation, it monitors multiple parameters in real time, such as engine speed, oil pressure, metering valve drive frequency, and oil consumption ratio; it constructs a dual protection mechanism of "sensor closed loop + oil pressure switch" to classify and handle high and low pressure abnormalities, link safety interlocks, and effectively avoid component damage; 3. Calibration and Adaptation: Core control parameters are configured through calibration map values, without modifying the underlying control logic. This allows for quick adaptation to different usage scenarios and operating conditions, such as low-altitude aircraft and special equipment, with strong adaptability and convenient maintenance in the future.
[0012] 4. Dual redundancy protection: In terms of hardware, the CAN bus and oil pressure switch provide physical redundancy to avoid the failure of the entire lubrication system due to the failure of a single component; in terms of software, the minimum speed of the main oil pump, the flow limit of the metering valve and the safety mode are set. When a component malfunctions, the system can automatically switch to a safe operating state to ensure basic lubrication of the engine. 5. Full-process traceability: From system power-on self-test to normal operation, all key parameters are monitored throughout the process, and parameter changes are recorded in real time. If an abnormality occurs, the fault point can be quickly located through parameter data (such as abnormal oil pressure corresponding to pipeline blockage or component failure), reducing maintenance costs and improving maintenance efficiency. 6. Precise balance between safety and adaptability: Closed-loop control ensures stable oil supply and cooling, calibrated design takes into account the adaptability of different working conditions, and graded protection mechanism ensures safe operation, effectively improving the overall reliability and service life of the rotary engine and solving the pain points of insufficient lubrication, unstable oil pressure, and uncontrolled oil consumption in existing technologies. Attached Figure Description
[0013] Figure 1 Flowchart of the cooling, lubrication and metering valve control method for the main oil pump of a single-rotor engine; Figure 2 A schematic diagram of the main oil supply circuit and metering lubrication branch circuit for engine oil. Detailed Implementation
[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0015] Combination Figure 1-2 Description: A cooling and lubrication control system for a single-rotor engine main oil pump includes: a main oil supply circuit, a metering lubrication branch circuit, a main oil pump, an oil pressure sensor, a metering valve, and an oil pressure switch. The oil pressure sensor is fixedly installed at the outlet end of the main oil pump, and the oil pressure switch is installed at the outlet end of the metering valve. The inlet end of the main oil pump is fixedly connected to the main oil supply circuit via an oil collector, and the metering lubrication branch circuit is fixedly connected to the inlet end of the metering valve. (Check if the connections at the highlighted positions are correct).
[0016] Furthermore, the main oil pump is an electronic one, precisely controlled via a CAN bus interface. Its flow requirements can be preset in the OILFLOWDEM_MAP calibration table to adapt to lubrication needs under different operating conditions. The minimum oil pump speed requirement related to engine speed can be precisely calibrated through the EOPMINSPD_CUR calibration parameters to ensure that the main oil pump output flow always meets the engine's basic lubrication and cooling requirements. At the same time, it adopts a speed closed-loop control optimization design to respond to speed adjustment commands in real time, improving the stability of oil pressure and flow.
[0017] Furthermore, the oil pressure sensor is used to collect the oil pressure data output by the main oil pump in real time and transmit the data to the control system. The system uses the OILFLOW2SPD_MAP calibration table to compare and analyze the actual oil pressure collected by the oil pressure sensor with the preset target oil pressure, automatically set and correct the speed requirement of the main oil pump, and ensure that the output oil pressure of the main oil pump is stable within the preset reasonable range, so as to avoid component damage caused by excessively high or low oil pressure.
[0018] Furthermore, the metering valve is specifically designed for the quantitative distribution of oil. Its maximum flow rate can reach 99.4 cubic centimeters per hour, meeting the oil supply requirements under different operating conditions. The target oil supply quantity is set through the OILDOSINGDEM_MAP calibration table, and the control system converts the target flow demand into the corresponding drive frequency of the metering valve. The precise quantitative supply of oil is achieved through frequency adjustment, avoiding oil waste or insufficient lubrication.
[0019] Furthermore, the oil pressure switch is used to monitor the output oil pressure of the metering valve in real time. This verifies whether the metering valve is in an effective working state and ensures that the oil output from the metering valve has sufficient pressure to be smoothly delivered to the combustion chamber of the single-rotor engine for effective lubrication. Simultaneously, it enables real-time monitoring and protection against abnormal oil pressure. When an abnormality occurs, the protection mechanism is triggered promptly. The specific control process is as follows: Figure 1 As shown.
[0020] Furthermore, the main oil supply circuit and the metering lubrication branch circuit work together and cooperate to achieve precise cooling and lubrication of all key components of the rotary engine. The specific process is as follows: Figure 2 As shown.
[0021] Further, the working process of the main oil supply circuit: Oil collection and coarse filtration: The oil in the oil pan (oil sump) first passes through the oil collector for coarse filtration, which initially filters out large particles of impurities (such as metal shavings and dust) in the oil, preventing impurities from entering the subsequent oil circuit and wearing out the main oil pump, metering valve and core engine components. Pressurized delivery: The coarse filtered oil enters the electronic main oil pump through the oil pump adapter. The electronic main oil pump establishes a stable output pressure and continuously delivers the oil to the subsequent cooling and lubrication circuits, ensuring stable oil pressure in the oil circuits. Cooling and Fine Filtration (Core Cooling and Lubrication Synergy): Pressurized engine oil flows through oil pan passage 1 to the oil cooler, where it is cooled to prevent deterioration due to prolonged high-temperature operation and ensure its lubricating performance. The cooled oil then enters the oil filter for fine filtration, removing small impurities and further improving its cleanliness. The filtered oil then flows through oil pan passage 2 into the front cover oil passage, preparing for subsequent metering and lubrication of components. An oil pressure sensor installed in this section monitors the oil pressure in real time and feeds the data back to the control system, providing precise data support for subsequent main oil pump speed correction and achieving coordinated control of cooling and lubrication.
[0022] Further, the workflow of the metering lubrication branch: Metering and distribution: Clean engine oil in the front cover oil passage enters the metering valve (solenoid valve). The control system adjusts the target oil supply according to the current engine operating conditions (speed, load) through the calibration map. The metering valve precisely controls the oil flow to achieve on-demand distribution of engine oil, which avoids oil waste and ensures sufficient lubrication of all components. Combustion chamber lubrication branch: Part of the engine oil output from the metering valve is precisely delivered into the combustion chamber through the oil pressure switch seat and oil pressure switch, and then through the oil passage of the rotor housing. After participating in combustion, it is discharged with the exhaust gas, realizing the unique "in-cylinder lubrication" of the rotary engine, effectively ensuring the lubrication effect and airtightness of the combustion chamber seals and cylinder wall, and reducing component wear.
[0023] Furthermore, the present invention achieves precise control of the oil consumption ratio through the above-described solution: Operating condition linkage calibration: Based on operating condition parameters such as engine speed, load, and ambient temperature, the target oil supply amount under different operating conditions is preset to achieve basic calibration of the consumption ratio; Real-time feedback correction: Real-time data is collected by oil pressure sensor and engine speed sensor. The control system compares the actual oil consumption with the target consumption ratio, automatically corrects the metering valve drive frequency, and adjusts the oil injection quantity to ensure that the consumption ratio is stable within the preset range. Limiting protection control: Set upper and lower limits for oil consumption ratio. When the consumption ratio exceeds the threshold, trigger an alarm and adjust the flow of the metering valve to avoid excessive consumption or insufficient lubrication.
[0024] A control method for a main oil pump cooling and lubrication control system of a single-rotor engine, the method comprising the following steps: S1: System power-on initialization; S2: Main oil pump cooling and lubrication control; S3: Metering valve quantitative control; S4: Oil pressure switch protection process; The oil pressure switch monitors the oil pressure at the outlet of the metering valve in real time and executes corresponding protection actions according to the oil pressure status to ensure the safe operation of the lubrication system.
[0025] S5: System operation and monitoring and oil consumption ratio control; During system operation, key parameters such as engine speed, main oil pump speed, oil pressure, metering valve drive frequency, and oil supply are monitored in real time, and the actual oil consumption ratio is calculated to make abnormal judgments and handle them.
[0026] S1 includes the following steps: S101: Automatically start the self-test process, sequentially test the CAN bus communication, oil pressure sensor, oil pressure switch, and metering valve drive module to confirm that each component is connected normally and is in good working condition; S102: Load preset calibration parameters, including the main oil pump flow requirement table, the main oil pump minimum speed table, the metering valve flow requirement table, the oil pressure speed table, and the upper and lower limits of the oil consumption ratio; to provide accurate parameter support for subsequent control processes.
[0027] S103: After the self-test passes, the system enters standby mode and waits for the engine start command.
[0028] S2 includes the following steps: S201: The control system collects engine speed in real time and obtains the target flow requirement of the main oil pump at the corresponding speed by querying the OILFLOWDEM_MAP calibration parameter table; S202: By adjusting the relevant calibration parameters, the minimum speed of the main oil pump is limited to avoid insufficient oil supply due to excessively low speed, which would fail to meet the cooling and lubrication requirements. S203: The control system outputs control commands via the CAN bus to drive the main oil pump to run at the target speed, drawing oil from the oil pan and pressurizing and delivering it. S204: The oil pressure sensor at the outlet of the main oil pump collects the actual oil pressure in real time and feeds the data back to the control system. The system compares and analyzes the actual oil pressure with the preset target oil pressure. S205: Automatically corrects the main oil pump speed requirement based on oil pressure deviation, outputs the corrected speed command, and drives the main oil pump to adjust its speed. This ensures that the oil pressure remains stable within a preset reasonable range, achieving coordinated supply of cooling and lubrication.
[0029] S3 includes the following steps: S301: The control system reads the OILDOSINGDEM_MAP calibration table and sets the target fuel supply based on the current engine speed, load and other operating parameters. S302: The control system converts the target oil supply into the driving frequency corresponding to the metering valve, and sets the flow limit to ensure that the maximum output flow of the metering valve does not exceed 99.4 cm³ / h, so as to avoid excessive oil consumption. S303: Outputs control signals according to the converted drive frequency to drive the metering valve to operate; realizes precise quantitative distribution of oil, and provides the appropriate amount of oil to the combustion chamber and other core components.
[0030] S304: The oil pressure data at the outlet of the metering valve is collected synchronously through the oil pressure switch to verify the working status of the metering valve. If the flow rate is abnormal, the drive frequency is adjusted in time.
[0031] S4 includes the following steps: S401: Low oil pressure: Triggers a low pressure alarm, indicating a problem with pipe blockage, metering valve malfunction, or insufficient oil supply. Simultaneously, it triggers a safety interlock, increases the main oil pump speed, and adjusts the metering valve frequency. If the pressure remains too low, it triggers engine load reduction operation to prevent component wear due to insufficient lubrication.
[0032] S402: Oil pressure too high: Triggers high pressure protection, limits the main oil pump speed, reduces oil output pressure, and shuts down if the pressure remains too high; to avoid damage to oil circuit components and metering valves.
[0033] S403: Oil pressure normal: The system continues to operate normally, and the oil pressure switch continuously monitors the oil pressure data and feeds it back to the control system in real time.
[0034] S5 includes the following steps: S501: Oil pressure remains abnormal for more than 5 seconds: This indicates a system overload or component failure, and a protective shutdown action is executed to prevent damage to core engine components.
[0035] S502: Metering valve frequency exceeds limit: Executes frequency limiting operation and triggers an alarm, prompting the operator to check the metering valve or calibration parameters; S503: CAN communication interruption: The system automatically enters safe mode, drives the main oil pump and metering valve to operate at the preset minimum speed to maintain basic lubrication supply; avoids engine shutdown, and triggers an alarm at the same time.
[0036] S504: Abnormal oil consumption ratio: When the actual consumption ratio exceeds the preset upper and lower thresholds, the metering valve drive frequency is automatically corrected and the oil injection quantity is adjusted. S505: All parameters are normal: Return to the cycle monitoring state to continuously ensure the stable operation of the lubrication system. Achieve coordinated control of cooling and lubrication.
[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A cooling and lubrication control system for a main oil pump of a single-rotor engine, characterized in that: include: The system includes a main oil supply circuit, a metering lubrication branch circuit, a main oil pump, an oil pressure sensor, a metering valve, and an oil pressure switch. The oil pressure sensor is fixedly installed at the outlet end of the main oil pump, and the oil pressure switch is installed at the outlet end of the metering valve. The inlet end of the main oil pump is fixedly connected to the main oil supply circuit via an oil collector, and the metering lubrication branch circuit is fixedly connected to the inlet end of the metering valve.
2. A control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 1, characterized in that: The method includes the following steps: S1: System power-on initialization; S2: Main oil pump cooling and lubrication control; S3: Metering valve quantitative control; S4: Hydraulic pressure switch protection procedure; S5: System operation and monitoring, and oil consumption ratio control.
3. The control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 2, characterized in that: S1 includes the following steps: S101: Automatically start the self-test process, sequentially test the CAN bus communication, oil pressure sensor, oil pressure switch, and metering valve drive module to confirm that each component is connected normally and is in good working condition; S102: Load preset calibration parameters, including main oil pump flow requirement table, main oil pump minimum speed table, metering valve flow requirement table, oil pressure speed table, and upper and lower limits of oil consumption ratio. S103: After the self-test passes, the system enters standby mode and waits for the engine start command.
4. The control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 2, characterized in that: S2 includes the following steps: S201: The control system collects engine speed in real time and obtains the target flow requirement of the main oil pump at the corresponding speed by querying the OILFLOWDEM_MAP calibration parameter table; S202: By adjusting the relevant calibration parameters, the minimum speed of the main oil pump is limited to avoid insufficient oil supply due to excessively low speed, which would fail to meet the cooling and lubrication requirements. S203: The control system outputs control commands via the CAN bus to drive the main oil pump to run at the target speed, drawing oil from the oil pan and pressurizing and delivering it. S204: The oil pressure sensor at the outlet of the main oil pump collects the actual oil pressure in real time and feeds the data back to the control system. The system compares and analyzes the actual oil pressure with the preset target oil pressure. S205: Automatically corrects the main oil pump speed requirement based on oil pressure deviation, outputs the corrected speed command, and drives the main oil pump to adjust the speed.
5. The control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 2, characterized in that: S3 includes the following steps: S301: The control system reads the OILDOSINGDEM_MAP calibration table and sets the target fuel supply based on the current engine speed, load and other operating parameters. S302: The control system converts the target oil supply into the driving frequency corresponding to the metering valve, and sets the flow limit to ensure that the maximum output flow of the metering valve does not exceed 99.4 cm³ / h, so as to avoid excessive oil consumption. S303: Outputs a control signal according to the converted drive frequency to drive the metering valve to operate; S304: The oil pressure data at the outlet of the metering valve is collected synchronously through the oil pressure switch to verify the working status of the metering valve. If the flow rate is abnormal, the drive frequency is adjusted in time.
6. The control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 2, characterized in that: S4 includes the following steps: S401: Low oil pressure: Triggers a low pressure alarm, indicating pipeline blockage, metering valve failure or insufficient oil supply. At the same time, it triggers the safety interlock, increases the main oil pump speed and adjusts the metering valve frequency. If the pressure remains too low, it triggers the engine to operate under reduced load. S402: Oil pressure too high: Triggers high pressure protection, limits the main oil pump speed, reduces oil output pressure, and shuts down if the pressure remains too high; S403: Oil pressure normal: The system continues to operate normally, and the oil pressure switch continuously monitors the oil pressure data and feeds it back to the control system in real time.
7. The control method for the cooling and lubrication control system of the main oil pump of a single-rotor engine according to claim 2, characterized in that: S5 includes the following steps: S501: Oil pressure continues to be abnormal for more than 5 seconds: This is determined to be a system overload or component failure, and a protective shutdown action is executed. S502: Metering valve frequency exceeds limit: Executes frequency limiting operation and triggers an alarm, prompting the operator to check the metering valve or calibration parameters; S503: CAN communication interruption: The system automatically enters safe mode and drives the main oil pump and metering valve at the preset minimum speed to maintain basic lubrication supply. S504: Abnormal oil consumption ratio: When the actual consumption ratio exceeds the preset upper and lower thresholds, the metering valve drive frequency is automatically corrected and the oil injection quantity is adjusted. S505: All parameters are normal: Return to the cycle monitoring state to continuously ensure the stable operation of the lubrication system.