Engine control method and device, electronic equipment, vehicle and storage medium
By using the electronic control unit and the engine control unit to coordinate the movement of the engine camshaft in a preset adjustment direction under engine start-stop conditions, the vibration problem during engine start-up and shutdown is solved, resulting in more efficient engine control and a better driving experience.
Patent Information
- Application Number
- CN202511854630.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-03-17
AI Technical Summary
Existing engines suffer from vibration problems due to the uncertain valve closing time during startup or shutdown, and the control methods are lagging and have insufficient success rate.
By using the electronic control unit and engine control unit to coordinate the movement of the engine camshaft in the preset adjustment direction under engine start-stop conditions, and in combination with the variable valve timing mechanism, the valve timing position and speed are precisely adjusted to reduce gas compression pressure.
It effectively reduces engine vibration during startup and shutdown, improves the success rate and stability of mitigating engine vibration, and enhances the driving experience.
Smart Images
Figure CN121676157A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine control technology, and in particular to an engine control method, device, electronic equipment, vehicle, and storage medium. Background Technology
[0002] Excessive gas compression pressure during engine start-up or shutdown can easily cause engine vibration. For example, in engines using electrically operated variable valve timing mechanisms, the camshaft continues to move after the engine stops, and the valves may not close at the position of minimum effective compression ratio, leading to vibration upon restarting. Existing technology uses engine stop position management, adjusting the crankshaft position when the engine stops and using valve springs in the timing mechanism to reverse-pressure the camshaft, locking it in a specific position to reduce engine start-up vibration. However, this engine stop position management method is delayed, prolonging engine stop time and lacking a guaranteed success rate, thus failing to effectively prevent engine vibration. Summary of the Invention
[0003] This application provides an engine control method, device, electronic device, vehicle, and storage medium, which aims to improve upon and address the problems of lag and insufficient success rate in existing engine vibration mitigation control methods.
[0004] An engine control method, comprising: When it is confirmed that the vehicle meets the engine start-stop conditions, pre-start-stop control is executed. The pre-start-stop control is to control the engine camshaft of the vehicle to move continuously in a preset adjustment direction. After the target pre-start-stop duration, the engine camshaft is controlled to stop moving in the preset adjustment direction, and the vehicle is controlled to perform engine speed adjustment operation to complete engine start-stop control.
[0005] This embodiment adjusts the valve timing position of the engine camshaft in the variable valve timing mechanism based on pre-start-stop control after confirming that the vehicle meets the engine start-stop conditions and before the engine speed changes. This changes the effective compression ratio, reduces the gas compression pressure during engine start-up and shutdown, effectively reduces engine vibration during start-up and shutdown, and improves the success rate and stability of mitigating engine vibration.
[0006] Furthermore, the step of performing pre-start-stop control when confirming that the vehicle meets the engine start-stop conditions includes: When it is confirmed that the vehicle meets the engine start-stop conditions, a pre-start-stop operation command is sent to the target actuator so that the target actuator controls the engine cam to move continuously in the direction of decreasing axial effective compression ratio; the target actuator includes an engine control unit; After the target pre-start-stop duration has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and the vehicle is controlled to perform engine speed adjustment operation to complete engine start-stop control, including: After the pre-start-stop duration, the engine camshaft is controlled to stop moving in the preset adjustment direction, and a start-stop operation command is sent to the target actuator so that the target actuator controls the vehicle to perform engine speed adjustment operation, thus completing the engine start-stop control.
[0007] This embodiment utilizes the interaction and cooperation between the electronic control unit, engine control unit, and valve mechanism control unit to control the continuous movement of the engine camshaft in a preset adjustment direction, enabling precise control of valve opening and closing timing. By controlling the movement and stopping of the engine camshaft based on pre-start / stop duration, the valve timing position can be precisely adjusted during the pre-start phase, reducing vibration and noise during engine start-up and shutdown. In a variable valve timing system, adjusting the camshaft ensures timely valve opening and closing, improving engine vibration and enhancing the driving experience. Simultaneously, this embodiment executes engine speed adjustment operations promptly through start-stop operation commands, optimizing overall engine start-stop control and further improving the driving experience.
[0008] Furthermore, the step of performing pre-start-stop control when confirming that the vehicle meets the engine start-stop conditions includes: When it is confirmed that the vehicle meets the engine starting conditions, a pre-start operation command is sent to the target actuator, so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in the direction of decreasing the effective compression ratio based on the pre-start motor speed and pre-start motor torque in the pre-start operation command; the target actuator includes an engine control unit. After the target pre-start-stop duration has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and the vehicle is controlled to perform engine speed adjustment operation to complete engine start-stop control, including: After the target pre-start time has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and a start operation command is sent to the target actuator. The target actuator then controls the engine speed to gradually increase from 0 to the target start speed based on the target start speed in the start operation command, thereby completing the engine start control.
[0009] This embodiment obtains motor speed and torque information through a pre-start operation command, enabling precise control of the variable timing motor to drive the engine camshaft during the pre-start phase. This allows for advance adjustment of valve timing positions, helping to avoid abnormal cylinder pressure, reduce engine vibration and shock, and achieve a smooth start. Furthermore, this embodiment can promptly change the engine speed after pre-start-stop control via the start operation command, achieving precise engine speed control based on the engine's actual operating conditions and optimizing engine starting performance.
[0010] Furthermore, the step of performing pre-start-stop control when confirming that the vehicle meets the engine start-stop conditions includes: When it is confirmed that the vehicle meets the engine shutdown conditions, a pre-shutdown operation command is sent to the target actuator, so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in the direction of decreasing the effective compression ratio based on the pre-shutdown motor speed and pre-shutdown motor torque in the pre-shutdown operation command; the target actuator includes an engine control unit; After the target pre-start-stop duration has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and the vehicle is controlled to perform engine speed adjustment operation to complete engine start-stop control, including: After the target pre-stop time has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and a stop operation command is sent to the target actuator so that the target actuator controls the engine speed to gradually decrease from the real-time operating speed to 0 according to the stop operation command, thereby completing the engine stop control.
[0011] This embodiment obtains motor speed and torque information through a pre-stop operation command, enabling precise control of the valve timing motor driving the engine camshaft during the pre-stop phase. This allows for advance adjustment of valve timing positions, reducing engine vibration and impact. Furthermore, this embodiment, through the stop operation command, can promptly change the engine speed after pre-start-stop control, achieving precise engine speed control based on the engine's actual operating conditions.
[0012] Furthermore, before controlling the engine camshaft to stop moving in the preset adjustment direction after the target pre-start / stop time has elapsed, the following steps are included: Multiple candidate pre-start-stop durations of the vehicle and the test effective compression ratio corresponding to each candidate pre-start-stop duration are obtained. Based on the minimum test compression ratio among all the test effective compression ratios, a target pre-start-stop duration is determined from all the candidate pre-start-stop durations. The target pre-start-stop duration is the candidate pre-start-stop duration corresponding to the minimum test effective compression ratio, and the test effective compression ratio is the engine effective compression ratio after the engine camshaft axis is continuously moved in a preset adjustment direction based on the candidate pre-start-stop duration.
[0013] This embodiment uses real-vehicle testing to screen out the pre-start-stop duration that enables the test to achieve the optimal effective compression ratio, ensuring that the engine reaches a more ideal compression state during the pre-start-stop control process, avoiding instability caused by human setting or theoretical calculation errors, and effectively reducing the engine vibration level.
[0014] Furthermore, when the vehicle is a fuel-powered vehicle, the engine start-stop condition is receiving an active start-stop request; When the vehicle is a hybrid vehicle, the engine start-stop condition is that the current battery charge level matches the battery charge threshold corresponding to the engine start-stop condition, and / or the current vehicle speed matches the vehicle speed threshold corresponding to the engine start-stop condition. The battery charge thresholds corresponding to the engine start-stop conditions include the starting battery charge thresholds corresponding to the engine start conditions and the stopping battery charge thresholds corresponding to the engine stop conditions; the vehicle speed thresholds corresponding to the engine start-stop conditions include the starting vehicle speed thresholds corresponding to the engine start conditions and the stopping vehicle speed thresholds corresponding to the engine stop conditions.
[0015] This embodiment takes into account different influencing factors for fuel vehicles and hybrid vehicles, and sets different engine start-stop conditions to ensure that the engine can respond in a timely manner when the driver needs to start or stop.
[0016] An engine control device, comprising: The pre-start-stop control module is used to execute pre-start-stop control when it is confirmed that the vehicle meets the engine start-stop conditions. The pre-start-stop control is to control the engine camshaft of the vehicle to move continuously in a preset adjustment direction. The start-stop control module is used to control the engine camshaft to stop moving in the preset adjustment direction after the target pre-start-stop time has elapsed, and to control the vehicle to perform engine speed adjustment operation, thereby completing engine start-stop control.
[0017] An electronic device includes a processor and a memory, wherein, Memory, used to store computer programs; The processor is used to execute the program stored in the memory to implement the engine control method described above.
[0018] A vehicle comprising the aforementioned electronic equipment.
[0019] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described engine control method. Attached Figure Description
[0020] Figure 1 This is a flowchart of an engine control method provided in an embodiment of this application; Figure 2 This is a control unit interaction diagram of an engine control method provided in an embodiment of this application; Figure 3 This is a schematic diagram of the start-up process in an engine control method provided in an embodiment of this application; Figure 4 This is a schematic diagram of the pre-start and start-up control of an engine control method provided in an embodiment of this application; Figure 5 This is a schematic diagram of the shutdown process in an engine control method provided in an embodiment of this application; Figure 6 This is a schematic diagram of the pre-stop and stop control of an engine control method provided in an embodiment of this application; Figure 7 This is a schematic diagram of the effective compression ratio change in an engine control method provided in an embodiment of this application; Figure 8 This is a structural diagram of the engine control device provided in the embodiments of this application; Figure 9 This is a structural diagram of the electronic device provided in the embodiments of this application. Detailed Implementation
[0021] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0022] Terminology Explanation In this application, the engine control method is applied to the vehicle's Electronic Control Unit (ECU). Engine start-stop conditions refer to the vehicle's state and parameter conditions used to determine whether the engine needs to be started or stopped. The vehicle's ECU controls engine components to perform specific operations, enabling the engine start-stop process. This process is divided into two stages: pre-start-stop control and start-stop control. Pre-start-stop control is the preliminary stage of start-stop control. Pre-start-stop control refers to the control process of adjusting valve timing positions when starting or stopping the engine, while start-stop control refers to the control process of adjusting engine speed when starting or stopping the engine. Valve timing position refers to the relative positional relationship between the engine camshaft and crankshaft, directly affecting the opening and closing times of the valves and is a key parameter for engine performance. The valve closing time can be adjusted by the variable valve timing (VVT) mechanism in the engine assembly. VVT mechanisms can be classified into hydraulic and electric types based on their drive method. Hydraulic-driven mechanisms have limited effectiveness in reducing the compression ratio, and the VVT mechanism cannot be driven when the engine is stopped due to lack of oil pressure. Therefore, this application uses an electric VVT mechanism to achieve engine pre-start / stop control. The electric VVT mechanism consists of a valve timing motor (also known as a variable timing motor), gears, and an engine camshaft. The variable timing motor is coupled to the engine camshaft via gears, and the movement of the engine camshaft driven by the variable timing motor can adjust the valve closing time. Specifically, pre-start / stop control involves controlling the engine camshaft to move in a preset adjustment direction and maintaining the pre-start / stop for a specified duration. The preset adjustment direction is a pre-set camshaft movement direction used to reduce the effective compression ratio. The target pre-start / stop duration is a pre-set specified duration for controlling the engine camshaft movement when starting or stopping the engine. The effective compression ratio is the ratio between the cylinder volume when the intake valve is closed and the cylinder volume when the piston is at top dead center. The formula is ε´=Ve / Vc, where ε´ represents the effective compression ratio, Ve represents the cylinder volume when the intake valve is closed, and Vc represents the cylinder volume when the piston is at top dead center. As the engine camshaft continuously moves in the preset adjustment direction, the valve timing position moves closer to the position where the cylinder volume decreases when the valve is closed, and the effective compression ratio also decreases. After a pre-start / stop period, the engine camshaft stops moving in the preset adjustment direction, allowing the valve timing position to approach or reach the desired position with the minimum effective compression ratio, thereby effectively reducing engine vibration.
[0023] The vehicle's electronic control unit (ECU) can directly control engine components to achieve engine pre-start-stop control and start-stop control, or it can cooperate with other control units as needed to achieve engine pre-start-stop control and start-stop control. The target actuator refers to the control unit used to implement engine pre-start-stop control and start-stop control based on the operating commands sent by the ECU. The target actuator can be the engine control unit, or a combination of the engine control unit and the valve mechanism control unit. Please refer to [reference needed]. Figure 2 The electronic control unit (ECU) communicates with the engine control unit (ECU), and the ECU communicates with the valve mechanism control unit (VMU). The ECU performs data processing and logic analysis, and sends pre-start / stop operation commands or start / stop operation commands to the ECU. The ECU controls designated engine components to execute these commands. When executing a pre-start / stop operation command, the ECU forwards it to the VMU, which controls the variable valve timing mechanism in the engine components to perform a specified operation in response to the command. Pre-start / stop operation commands are used to implement pre-start / stop control and are divided into pre-start operation commands and pre-stop operation commands. Pre-start operation commands are control commands used to move the engine camshaft in the variable valve timing mechanism when the engine needs to be started, while pre-stop operation commands are control commands used to move the engine camshaft in the variable valve timing mechanism when the engine needs to be stopped. The pre-start operation command includes the pre-start motor speed and pre-start motor torque. The pre-start motor speed is the speed control parameter used to drive the variable timing motor when the engine needs to be started, and the pre-start motor torque is the torque control parameter used to drive the variable timing motor when the engine needs to be started. The pre-stop operation command includes the pre-stop motor speed and pre-stop motor torque. The pre-stop motor speed is the speed control parameter used to drive the variable timing motor when the engine needs to be stopped, and the pre-stop motor torque is the torque control parameter used to drive the variable timing motor when the engine needs to be stopped. The interval between the pre-start / stop operation command and the start / stop operation command is the pre-start / stop duration. The start / stop operation command is the operation command used to implement start / stop control. The start / stop operation command is divided into start operation command and stop operation command. The start operation command is the control command that increases the engine speed when the engine needs to be started, and the stop operation command is the control command that decreases the engine speed when the engine needs to be stopped. The start operation command includes the target start speed, which is the speed value that the engine needs to reach after starting. The real-time operating speed refers to the actual speed value when the engine needs to be stopped.
[0024] The pre-start-stop duration includes the pre-start duration corresponding to pre-start control and the pre-stop duration corresponding to pre-stop control. The pre-start duration is a pre-set specified duration for controlling the engine camshaft movement when starting the engine, and the pre-stop duration is a pre-set specified duration for controlling the engine camshaft movement when stopping the engine. Candidate pre-start-stop durations are pre-set multiple selectable camshaft movement durations that reduce the effective compression ratio. The tested effective compression ratio is the engine's effective compression ratio after the engine camshaft has moved through different candidate pre-start-stop durations during a real-vehicle start-up or stop test. Each candidate pre-start-stop duration corresponds to its own tested effective compression ratio, and the minimum tested compression ratio is the minimum value among all tested effective compression ratios. The electronic control unit determines the candidate pre-start-stop duration corresponding to the minimum test compression ratio as the target pre-start-stop duration. That is, the target pre-start duration is the candidate pre-start duration that reduces the effective compression ratio the most among all candidate pre-start durations, and the target pre-stop duration is the candidate pre-stop duration that reduces the effective compression ratio the most among all candidate pre-stop durations.
[0025] An active start-stop request refers to a request triggered by the driver's active operation to start or stop the engine, such as a one-button start-stop request triggered by the driver when the vehicle is stationary. The battery charge threshold is a pre-set threshold value used to determine whether the engine needs to be started or stopped based on battery charge level, and the vehicle speed threshold is a pre-set threshold value used to determine whether the engine needs to be started or stopped based on vehicle speed.
[0026] This application provides an engine control method, which is illustrated using an example of its application in a vehicle's electronic control unit. Please refer to [link / reference]. Figure 1 This includes the following steps: S101: When it is confirmed that the vehicle meets the engine start-stop conditions, pre-start-stop control is executed, wherein the pre-start-stop control is to control the engine camshaft of the vehicle to move continuously in a preset adjustment direction; S102: After the target pre-start-stop duration has elapsed, control the engine camshaft to stop moving in the preset adjustment direction, and control the vehicle to perform engine speed adjustment operation to complete engine start-stop control.
[0027] Understandably, when the vehicle's electronic control unit (ECU) confirms that the engine start-stop conditions are met, it first controls the engine camshaft to move continuously in a preset adjustment direction. During this process, the relative position between the engine crankshaft and the engine camshaft changes, thereby altering the valve timing position and achieving pre-start-stop control. Next, after the engine camshaft has moved continuously for the target pre-start-stop duration, the ECU controls the engine camshaft to stop moving in the preset adjustment direction. If the engine is still running, the engine crankshaft will drive the engine camshaft via a chain, but the relative position between the engine crankshaft and the engine camshaft will not change. Then, the ECU controls the vehicle to perform engine speed adjustment, thereby achieving start-stop control.
[0028] This embodiment adjusts the valve timing position of the engine camshaft in the variable valve timing mechanism based on pre-start-stop control after confirming that the vehicle meets the engine start-stop conditions and before the engine speed changes. This changes the effective compression ratio, reduces the gas compression pressure during engine start-up and shutdown, effectively reduces engine vibration during start-up and shutdown, and improves the success rate and stability of mitigating engine vibration.
[0029] In one embodiment, please refer to Figure 2 In step S101, namely, when it is confirmed that the vehicle meets the engine start-stop conditions, the pre-start-stop control is executed, which includes the following steps: S201: When it is confirmed that the vehicle meets the engine start-stop conditions, a pre-start-stop operation command is sent to the target actuator to cause the target actuator to control the engine cam to move continuously in the direction of decreasing the effective compression ratio of the engine axial direction; the target actuator includes an engine control unit; In step S102, after the target pre-start-stop duration has elapsed, controlling the engine camshaft to stop moving in the preset adjustment direction, and controlling the vehicle to perform engine speed adjustment operation to complete engine start-stop control, includes: S202: After the pre-start-stop duration, control the engine camshaft to stop moving in the preset adjustment direction, and send a start-stop operation command to the target actuator so that the target actuator controls the vehicle to perform engine speed adjustment operation, thereby completing engine start-stop control.
[0030] Understandably, Figure 2The electronic control unit (ECU), engine control unit (ECU), and valve train control unit (VTU) work together to achieve pre-start-stop control and start-stop control. The ECU determines whether the vehicle meets the engine start-stop conditions and sends a pre-start-stop operation command to the ECU when the conditions are met. The ECU then forwards the received pre-start-stop operation command to the VTU. The VTU controls the engine camshaft to continuously move in a preset adjustment direction according to the pre-start-stop operation command. After sending the pre-start operation command to the ECU, the ECU waits for the pre-start-stop duration and then sends a start-stop operation command to the ECU. On one hand, the ECU instructs the VTU to stop the engine camshaft's movement in the preset adjustment direction according to the start-stop operation command. On the other hand, the ECU controls the vehicle to perform engine speed adjustment operations according to the start-stop operation command to complete the engine start-stop control.
[0031] This embodiment utilizes the interaction and cooperation between the electronic control unit, engine control unit, and valve mechanism control unit to control the continuous movement of the engine camshaft in a preset adjustment direction, enabling precise control of valve opening and closing timing. By controlling the movement and stopping of the engine camshaft based on pre-start / stop duration, the valve timing position can be precisely adjusted during the pre-start phase, reducing vibration and noise during engine start-up and shutdown. In a variable valve timing system, adjusting the camshaft ensures timely valve opening and closing, improving engine vibration and enhancing the driving experience. Simultaneously, this embodiment executes engine speed adjustment operations promptly through start-stop operation commands, optimizing overall engine start-stop control and further improving the driving experience.
[0032] In one embodiment, please refer to Figure 3 In step S101, namely, when it is confirmed that the vehicle meets the engine start-stop conditions, the pre-start-stop control is executed, including: S301: When it is confirmed that the vehicle meets the engine starting conditions, a pre-start operation command is sent to the target actuator so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in the direction of decreasing the effective compression ratio based on the pre-start motor speed and pre-start motor torque in the pre-start operation command. In step S102, after the target pre-start-stop duration has elapsed, controlling the engine camshaft to stop moving in the preset adjustment direction, and controlling the vehicle to perform engine speed adjustment operation to complete engine start-stop control, includes: S302: After the target pre-start time has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and a start operation command is sent to the target actuator so that the target actuator controls the engine speed to gradually increase from 0 to the target start speed based on the target start speed in the start operation command, so as to complete the engine start control.
[0033] Understandably, when the electronic control unit confirms that the vehicle meets the engine starting conditions, it sends a pre-start operation command to the engine control unit. The engine control unit parses the pre-start operation command to obtain the pre-start motor speed and torque, and sends them to the valve mechanism control unit. Based on the pre-start motor speed and torque, the valve mechanism control unit controls the variable timing motor to continuously move the engine camshaft in a preset adjustment direction. Please refer to [reference needed]. Figure 4 At time T0, the electronic control unit (ECU) confirms that the vehicle meets the engine starting conditions and sends a pre-start operation command to the engine control unit (ECU). At this time, the engine speed is 0, and the intake valve timing position is at point a. The target pre-start duration is the time period from time T0 to time T1, during which the engine speed is 0, and the intake valve timing position changes from point a to point b as the engine camshaft continues to move. At time T1, the ECU sends a start operation command to the ECU. The engine camshaft stops moving in the preset adjustment direction, and the intake valve timing position remains unchanged at point b (the same as point c), until the start control is completed and adjusted according to the engine camshaft state (e.g., from point c to point d). After receiving the start operation command from the ECU, the ECU parses the target start speed from the start operation command and controls the engine speed to gradually increase from 0 to the target start speed to complete the engine start control. Starting from time T1, the engine speed gradually increases from 0 to the target start speed, completing the start control. The ideal position of point b is the minimum effective compression ratio position corresponding to the intake valve timing position. In reality, because the position of point a corresponding to the intake valve timing position is not fixed before the engine camshaft moves, the position of point b corresponding to the intake valve timing position may be exactly the minimum effective compression ratio position, or it may be close to the minimum effective compression ratio position, as the engine camshaft moves in the direction of decreasing effective compression ratio. For example, if the minimum effective compression ratio position is 110, and the intake valve timing position actually reaches only 105 when the engine camshaft finishes moving in the preset adjustment direction, engine vibration can still be reduced.
[0034] This embodiment obtains motor speed and torque information through a pre-start operation command, enabling precise control of the variable timing motor to drive the engine camshaft during the pre-start phase. This allows for advance adjustment of valve timing positions, helping to avoid abnormal cylinder pressure, reduce engine vibration and shock, and achieve a smooth start. Furthermore, this embodiment can promptly change the engine speed after pre-start-stop control via the start operation command, achieving precise engine speed control based on the engine's actual operating conditions and optimizing engine starting performance.
[0035] In one embodiment, please refer to Figure 5 In step S101, namely, when it is confirmed that the vehicle meets the engine start-stop conditions, the pre-start-stop control is executed, including: S501: When it is confirmed that the vehicle meets the engine shutdown conditions, a pre-shutdown operation command is sent to the target actuator so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in the direction of decreasing effective compression ratio based on the pre-shutdown motor speed and pre-shutdown motor torque in the pre-shutdown operation command. In step S102, after the target pre-start-stop duration has elapsed, controlling the engine camshaft to stop moving in the preset adjustment direction, and controlling the vehicle to perform engine speed adjustment operation to complete engine start-stop control, includes: S502: After the target pre-stop time has elapsed, the engine camshaft is controlled to stop moving in the preset adjustment direction, and a stop operation command is sent to the target actuator so that the target actuator controls the engine speed to gradually decrease from the real-time operating speed to 0 according to the stop operation command, so as to complete the engine stop control.
[0036] Understandably, when the electronic control unit confirms that the vehicle meets the engine shutdown conditions, it sends a pre-shutdown operation command to the engine control unit. The engine control unit then extracts the pre-shutdown motor speed and torque from the pre-shutdown operation command and sends them to the valve mechanism control unit. Based on the pre-shutdown motor speed and torque, the valve mechanism control unit controls the variable timing motor to continuously move the engine camshaft in a preset adjustment direction. Please refer to [reference needed]. Figure 6At time T2, the electronic control unit (ECU) confirms that the vehicle meets the engine shutdown conditions and sends a pre-shutdown command to the engine control unit (ECU). At this time, the engine speed is greater than 0, and the intake valve timing position is at point e. The pre-shutdown period is from time T2 to time T3, during which the engine speed remains at the real-time operating speed. As the engine camshaft continues to move, the intake valve timing position changes from point e to point f. After receiving the shutdown command from the ECU, the ECU controls the engine speed to gradually decrease from the real-time operating speed to 0 to complete the engine shutdown control. At time T3, the ECU sends a shutdown command to the ECU. The engine camshaft stops moving in the preset adjustment direction, and the intake valve timing position remains unchanged at point f (the same as point g), until the shutdown control is completed and adjusted according to the engine camshaft state (e.g., after the engine stops, the camshaft may have inertial movement, and the intake valve timing position is adjusted from point g to point h). Simultaneously, starting from time T3, the engine speed gradually decreases from the real-time operating speed to 0, completing the shutdown control.
[0037] This embodiment obtains motor speed and torque information through a pre-stop operation command, enabling precise control of the variable timing motor to drive the engine camshaft during the pre-stop phase. This allows for advance adjustment of valve timing positions, reducing engine vibration and shock. Furthermore, this embodiment, through the stop operation command, can promptly change the engine speed after pre-start-stop control, achieving precise engine speed control based on the engine's actual operating conditions.
[0038] In one embodiment, the pre-start-stop duration includes a pre-start duration corresponding to pre-start control and a pre-stop duration corresponding to pre-stop control; step S102, that is, before controlling the engine camshaft to stop moving in the preset adjustment direction after the pre-start-stop duration has elapsed, includes: Multiple candidate pre-start-stop durations of the vehicle and the test effective compression ratio corresponding to each candidate pre-start-stop duration are obtained. Based on the minimum test compression ratio among all the test effective compression ratios, a target pre-start-stop duration is determined from all the candidate pre-start-stop durations. The target pre-start-stop duration is the candidate pre-start-stop duration corresponding to the minimum test effective compression ratio, and the test effective compression ratio is the engine effective compression ratio after the engine camshaft axis is continuously moved in a preset adjustment direction based on the candidate pre-start-stop duration.
[0039] Understandably, during the vehicle design and manufacturing phase, factory personnel pre-set multiple candidate pre-start times for vehicle testing to determine the target pre-start time, and also pre-set multiple candidate pre-stop times for vehicle testing to determine the target pre-stop time. During vehicle testing, the impact of different pre-start times with varying preset adjustment directions of the engine camshaft axis on the effective compression ratio can be referenced... Figure 7The solid line represents the relationship between valve lift and piston position when the candidate pre-start time is short. At this time, the valve closing time (i.e., when the valve lift curve gradually decreases to 0) is close to the piston's bottom dead center. The cylinder volume at the moment of valve closing is close to the maximum volume, resulting in a higher effective compression ratio and making engine vibration more likely. The dashed line represents the relationship between valve lift and piston position when the candidate pre-start time is long. At this time, the valve closing time is far from the piston's bottom dead center, and the cylinder volume at the moment of valve closing has decreased significantly. Therefore, the effective compression ratio is lower, and engine vibration is less likely.
[0040] The electronic control unit (ECU) acquires multiple candidate pre-start times from the real-vehicle test results, along with the effective compression ratios corresponding to each candidate pre-start time. The candidate pre-start time corresponding to the minimum test compression ratio is then determined as the target pre-start time. The ECU also acquires multiple candidate pre-stop times from the real-vehicle test results, along with the effective compression ratios corresponding to each candidate pre-stop time. The candidate pre-stop time corresponding to the minimum test compression ratio is then determined as the target pre-stop time.
[0041] This embodiment uses real-vehicle testing to screen out the pre-start-stop duration that enables the test to achieve the optimal effective compression ratio, ensuring that the engine reaches a more ideal compression state during the pre-start-stop control process, avoiding instability caused by human setting or theoretical calculation errors, and effectively reducing the engine vibration level.
[0042] In one embodiment, in step S101, when the vehicle is a fuel vehicle, the engine start-stop condition is receiving an active start-stop request; When the vehicle is a hybrid vehicle, the engine start-stop condition is that the current battery charge level matches the battery charge threshold corresponding to the engine start-stop condition, and / or the current vehicle speed matches the vehicle speed threshold corresponding to the engine start-stop condition. The battery charge thresholds corresponding to the engine start-stop conditions include the starting battery charge thresholds corresponding to the engine start conditions and the stopping battery charge thresholds corresponding to the engine stop conditions; the vehicle speed thresholds corresponding to the engine start-stop conditions include the starting vehicle speed thresholds corresponding to the engine start conditions and the stopping vehicle speed thresholds corresponding to the engine stop conditions.
[0043] Understandably, when the vehicle is a gasoline-powered vehicle, if the electronic control unit receives an active start-stop request, it confirms that the vehicle meets the engine start-stop conditions. Active start-stop requests can be triggered in various ways, such as a one-button start-stop request triggered by the driver operating a button while the vehicle is stationary, or a start-stop request triggered by the driver pressing the brake pedal for an extended period while the vehicle is stationary. When the vehicle is a hybrid vehicle, the engine start-stop conditions include, but are not limited to, battery charge conditions, vehicle speed conditions, engine coolant temperature conditions, vehicle status conditions, air conditioning system demand conditions, and external environmental conditions; it can be one or more of these. For example, when the engine start-stop condition is an air conditioning system demand condition, if the air conditioning compressor is operating or the interior temperature deviates significantly from the air conditioning setpoint, it is confirmed that the vehicle meets the engine start-up conditions; if the air conditioning demand is low and the air conditioning compressor is inactive, it is confirmed that the vehicle meets the engine stop-off conditions. Specifically, taking the engine start-stop conditions as battery charge level and vehicle speed as an example, the electronic control unit collects battery charge level and vehicle speed for data processing. If it detects that the battery charge level has reached a preset battery charge level threshold and / or the vehicle speed has reached a preset vehicle speed threshold, it confirms that the vehicle meets the engine start-stop conditions, thereby automatically triggering the subsequent pre-start-stop control and start-stop control process.
[0044] This embodiment takes into account different influencing factors for fuel vehicles and hybrid vehicles, and sets different engine start-stop conditions to ensure that the engine can respond in a timely manner when the driver needs to start or stop.
[0045] This application also provides an engine control device 80, please refer to... Figure 8 The system includes: a pre-start-stop control module 801, used to perform pre-start-stop control when the vehicle meets the engine start-stop conditions, wherein the pre-start-stop control controls the engine camshaft of the vehicle to move continuously in a preset adjustment direction; and a start-stop control module 802, used to control the engine camshaft to stop moving in the preset adjustment direction after a target pre-start-stop duration has elapsed, and to control the vehicle to perform engine speed adjustment operation to complete the engine start-stop control.
[0046] This application also provides an electronic device 90, please refer to... Figure 9 It includes a memory 901 and a processor 902, wherein the memory 901 is used to store computer programs; and the processor 902 is used to execute the programs stored in the memory 901 to implement the engine control method described in any embodiment of this application.
[0047] This application also provides a vehicle that includes the electronic devices described in this application.
[0048] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the engine control method described in any embodiment of this application.
[0049] In this application, "multiple" refers to two or more.
[0050] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0051] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.
[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An engine control method characterized by, The method comprises the following steps: When it is confirmed that the vehicle meets the engine start-stop condition, a pre-start-stop control is performed, the pre-start-stop control being control of the engine camshaft of the vehicle to continuously move in a preset adjustment direction; After a target pre-start-stop time length elapses, the movement of the engine camshaft in the preset adjustment direction is stopped, and the vehicle is controlled to perform an engine speed adjustment operation to complete the engine start-stop control.
2. The engine control method according to claim 1, characterized by, The pre-start-stop control performed when it is confirmed that the vehicle meets the engine start-stop condition comprises: When it is confirmed that the vehicle meets the engine start-stop condition, a pre-start-stop operation instruction is sent to a target actuator, so that the target actuator controls the engine camshaft of the vehicle to continuously move in a direction of effective compression ratio reduction; the target actuator comprises an engine control unit; The control of the engine camshaft to stop moving in the preset adjustment direction after the target pre-start-stop time length elapses and the control of the vehicle to perform the engine speed adjustment operation to complete the engine start-stop control comprise: After the pre-start-stop time length elapses, the movement of the engine camshaft in the preset adjustment direction is stopped, and a start-stop operation instruction is sent to the target actuator, so that the target actuator controls the vehicle to perform the engine speed adjustment operation to complete the engine start-stop control.
3. The engine control method according to claim 1, characterized by, The pre-start-stop control performed when it is confirmed that the vehicle meets the engine start-stop condition comprises: When it is confirmed that the vehicle meets the engine start condition, a pre-start operation instruction is sent to a target actuator, so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in a direction of effective compression ratio reduction based on a pre-start motor speed and a pre-start motor torque in the pre-start operation instruction; the target actuator comprises an engine control unit; The control of the engine camshaft to stop moving in the preset adjustment direction after the target pre-start time length elapses and the control of the vehicle to perform the engine speed adjustment operation to complete the engine start-stop control comprise: After the target pre-start time length elapses, the movement of the engine camshaft in the preset adjustment direction is stopped, and a start operation instruction is sent to the target actuator, so that the target actuator controls the engine speed to gradually increase from 0 to a target start speed based on a target start speed in the start operation instruction to complete the engine start control.
4. The engine control method according to claim 1, characterized by, The pre-start-stop control performed when it is confirmed that the vehicle meets the engine start-stop condition comprises: When it is confirmed that the vehicle meets the engine stop condition, a pre-stop operation instruction is sent to a target actuator, so that the target actuator controls the valve timing motor to drive the engine camshaft to continuously move in a direction of effective compression ratio reduction based on a pre-stop motor speed and a pre-stop motor torque in the pre-stop operation instruction; the target actuator comprises an engine control unit; The control of the engine camshaft to stop moving in the preset adjustment direction after the target pre-start time length elapses and the control of the vehicle to perform the engine speed adjustment operation to complete the engine start-stop control comprise: After the target pre-stop duration elapses, the engine camshaft is controlled to end the movement in the preset adjustment direction, a stop operation instruction is sent to the target actuator, so that the target actuator controls the engine speed to gradually decrease from the real-time working speed to 0 according to the stop operation instruction, to complete the engine stop control.
5. The engine control method according to claim 1, characterized by, Before the target pre-start-stop duration elapses, the engine camshaft is controlled to end the movement in the preset adjustment direction, including: A plurality of candidate pre-start-stop durations of the vehicle and test effective compression ratios corresponding to the candidate pre-start-stop durations are obtained, a target pre-start-stop duration is determined from all the candidate pre-start-stop durations according to the minimum test compression ratio in all the test effective compression ratios; the target pre-start-stop duration is the candidate pre-start-stop duration corresponding to the minimum test compression ratio, and the test effective compression ratio is the engine effective compression ratio after the engine camshaft is controlled to continuously move in the preset adjustment direction based on the candidate pre-start-stop duration.
6. The engine control method according to claim 1, characterized by, When the vehicle is a fuel vehicle, the engine start-stop condition is that a voluntary start-stop request is received; When the vehicle is a hybrid vehicle, the engine start-stop condition is that the current battery capacity matches the battery capacity threshold corresponding to the engine start-stop condition, and / or the current vehicle speed matches the vehicle speed threshold corresponding to the engine start-stop condition; The battery capacity threshold corresponding to the engine start-stop condition includes a start battery capacity threshold corresponding to the engine start condition and a stop battery capacity threshold corresponding to the engine stop condition; and the vehicle speed threshold corresponding to the engine start-stop condition includes a start vehicle speed threshold corresponding to the engine start condition and a stop vehicle speed threshold corresponding to the engine stop condition.
7. An engine control device characterized by comprising: The engine control method comprises: A pre-start-stop control module is configured to perform pre-start-stop control when it is confirmed that the vehicle meets the engine start-stop condition, the pre-start-stop control being to control the engine camshaft of the vehicle to continuously move in a preset adjustment direction; A start-stop control module is configured to control the engine camshaft to end the movement in the preset adjustment direction after the target pre-start-stop duration elapses, and control the vehicle to perform an engine speed adjustment operation to complete the engine start-stop control.
8. An electronic device, comprising: The engine control method comprises a processor and a memory, wherein The memory is configured to store a computer program; The processor is configured to execute the program stored in the memory to implement the engine control method according to any one of claims 1-6.
9. A vehicle characterized by comprising: The electronic device comprises the engine control method according to claim 8.
10. A computer-readable storage medium, characterized in that, The computer program stored in the computer readable storage medium is executed by the processor to implement the engine control method according to any one of claims 1-6.