A vehicle engine stall prediction control method, a terminal device and a storage medium

Abstract

The present application relates to a kind of vehicle stop cylinder prediction control method, terminal device and storage medium, the method includes: S1: according to historical data, the torque fluctuation characteristic parameter when vehicle engine stop cylinder is acquired, torque fluctuation characteristic parameter includes the torque fluctuation amount and torque fluctuation time of total torque;S2: in the process of vehicle travel, whether real-time monitoring generates stop cylinder control signal;S3: when receiving stop cylinder control signal, according to the torque fluctuation characteristic parameter when stop cylinder, the current travel parameter of vehicle and the slope value of current and front road, stop cylinder control is carried out.The present application uses external condition to carry out auxiliary control, can utilize the moment of terrain change, offset stop cylinder torque fluctuation, improve stop cylinder control economy and applicability, optimize user experience.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and more particularly to a vehicle cylinder deactivation predictive control method, terminal equipment, and storage medium. Background Technology

[0002] When a vehicle is under low load, deactivating some cylinders in the engine can reduce the number of fuel-injecting cylinders and increase the load rate of the non-deactivated cylinders, thereby improving fuel efficiency. Therefore, cylinder deactivation technology can effectively improve the fuel economy of a vehicle. However, at the moment of cylinder deactivation, the stopped cylinders suddenly stop producing torque output, causing a sudden drop in total torque. The cylinders that remain active cannot immediately reach and compensate for the lost torque after cylinder deactivation, resulting in overall torque fluctuations. This causes driving discomfort, affects driving stability, and reduces the driver's experience. As the throttle opens and intake pressure gradually increases, the torque output of the active cylinders increases. It takes approximately two working cycles for the active cylinders to compensate, and the overall torque returns to the level before cylinder deactivation. Traditional methods optimize the cylinder deactivation effect from an internal control perspective to reduce torque fluctuations, such as optimizing throttle opening and injection angle control. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a vehicle cylinder deactivation predictive control method, a terminal device, and a storage medium.

[0004] The specific plan is as follows:

[0005] A vehicle cylinder deactivation predictive control method includes the following steps:

[0006] S1: Based on historical data, obtain the torque fluctuation characteristic parameters when the vehicle engine cylinders are deactivated. The torque fluctuation characteristic parameters include the torque fluctuation amount and torque fluctuation time of the total torque.

[0007] S2: During vehicle operation, monitor in real time whether a cylinder deactivation control signal is generated;

[0008] S3: When a cylinder deactivation control signal is received, cylinder deactivation control is performed based on the torque fluctuation characteristic parameters at the time of cylinder deactivation, the vehicle's current driving parameters, and the current and forward road gradient values.

[0009] Furthermore, in step S1, the torque fluctuation characteristic parameters are obtained by the curve of the total torque changing over time when the cylinder is shut down.

[0010] Furthermore, in step S2, the cylinder deactivation control signal is generated by the control logic of the engine controller.

[0011] Furthermore, step S3 specifically includes the following steps:

[0012] S31: When a cylinder deactivation control signal is received, record the corresponding time as the start time T0 of the cylinder deactivation signal and initialize i = 0;

[0013] S32: Get T i The position d ahead of the vehicle on the road at any given time i =v i The slope θ′ of the road at point t i Determine |θ′ i -θ″ i |Is the value less than the error threshold? If yes, execute engine cylinder deactivation and return to S2; otherwise, proceed to S33; where v i T represents i The vehicle speed at time t represents the torque fluctuation time, and θ″ represents the torque fluctuation time. i T represents i Expected slope of the road ahead at any given moment;

[0014] S33: Let i = i + 1, and determine T. i Check if the cylinder stop control signal is valid. If yes, proceed to S34; otherwise, return to S2.

[0015] S34: Determine T i -Is T0 less than the forced control time threshold K? If yes, return to S32; otherwise, force engine cylinder deactivation and return to S2.

[0016] Furthermore, T i Expected slope θ″ of the road ahead at any given time i The calculation formula is:

[0017] θ″ i =arcsin(ΔTjη / mgr)+θ i

[0018] Where ΔT represents the torque fluctuation, j represents the total transmission ratio from the engine to the drive wheels, η represents the efficiency of the transmission system, m represents the total mass of the vehicle, g represents the acceleration due to gravity, r represents the radius of the vehicle's drive wheels, and θ i T represents i The gradient of the road where the vehicle is located at any given time.

[0019] Furthermore, the slope value of the road ahead was obtained using electronic horizon data.

[0020] A vehicle cylinder deactivation prediction control terminal device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described in the embodiments of the present invention.

[0021] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above in the embodiments of the present invention.

[0022] The present invention adopts the above technical solution and uses external conditions for auxiliary control. It can take advantage of the instantaneous change in terrain to offset the fluctuation of cylinder shutdown torque, improve the economy and applicability of cylinder shutdown control, and optimize the user experience. Attached Figure Description

[0023] Figure 1 The diagram shown is a flowchart of Embodiment 1 of the present invention.

[0024] Figure 2 The figure shown is a graph illustrating the change of total torque over time when the cylinder is shut down in this embodiment. Detailed Implementation

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] This invention provides a vehicle cylinder deactivation predictive control method, such as... Figure 1 As shown, the method includes the following steps:

[0029] S1: Based on historical data, obtain the torque fluctuation characteristic parameters when the vehicle engine cylinders are deactivated. The torque fluctuation characteristic parameters include the torque fluctuation amount ΔT and the torque fluctuation time t of the total torque.

[0030] like Figure 2 As shown, the torque fluctuation amount ΔT and torque fluctuation time t can be obtained from the curve of total torque change over time when cylinder is shut down in historical data.

[0031] S2: During vehicle operation, monitor in real time whether a cylinder deactivation control signal is generated.

[0032] The cylinder deactivation control signal is generated by the engine controller (ECU) based on its existing control logic.

[0033] S3: When a cylinder deactivation control signal is received, cylinder deactivation control is performed based on the torque fluctuation characteristic parameters at the time of cylinder deactivation, the vehicle's current driving parameters, and the current and forward road gradient values.

[0034] The specific implementation steps of step S3 in this embodiment are as follows:

[0035] S31: When a cylinder deactivation control signal is received, record the corresponding time as the start time T0 of the cylinder deactivation signal and initialize i = 0.

[0036] S32: Get T i The position d ahead of the vehicle on the road at any given time i =v i The slope θ′ of the road at point t i Determine |θ′ i -θ″ i |Is the value less than the error threshold? If yes, execute engine cylinder deactivation and return to S2; otherwise, proceed to S33. Where v i T represents i The vehicle speed at time t represents the torque fluctuation time, and θ″ represents the torque fluctuation time. i T represents i Expected slope of the road ahead at any given time.

[0037] The error threshold is a small value, such as 0.005. Those skilled in the art can select a better value based on actual engineering debugging and experiments, and no restrictions are imposed here.

[0038] When |θ′ i -θ″ i When the error threshold is less than 1, it indicates that the current start-up cylinder deactivation is appropriate and the engine cylinder deactivation can be performed. At this time, the torque fluctuation will be roughly offset by the terrain change, thus optimizing the driving experience.

[0039] T i Expected slope θ″ of the road ahead at any given time i The calculation principle is as follows:

[0040] Set T i The slope of the road where the vehicle is located at time θ i Then T i The difference between the slope of the road in front of the vehicle and the slope of the road where the vehicle is located at any given time is θ″. i -θ i The difference in total vehicle torque demand due to terrain is: mgsin(θ″) i -θ iWhere m represents the total mass of the vehicle and g represents the acceleration due to gravity. Since the instantaneous torque fluctuation when the engine cylinders stop is ΔT, the power transmitted to drive the vehicle through the transmission system is: ΔTiη / r, where i represents the total transmission ratio from the engine to the drive wheels, η represents the efficiency of the transmission system (generally a fixed value, such as 0.9, depending on the vehicle model), and r represents the radius of the vehicle's drive wheels. When the difference in total torque demand due to terrain changes is the same as the engine torque fluctuation caused by cylinder stoppage, the impact on the driver's driving experience is relatively small. Therefore, we can obtain ΔTjη / r = mg sin(θ″). i -θ i ), simplifies to θ″ i =arcsin(ΔTjη / mgr)+θ i .

[0041] S33: Let i = i + 1, and determine T. i Check if the cylinder stop control signal is valid. If it is, proceed to S34; otherwise, return to S2.

[0042] S34: Determine T i -Is T0 less than the forced control time threshold K? If yes, return to S32; otherwise, force engine cylinder deactivation and return to S2.

[0043] The forced control time threshold K is usually set to a relatively short time, such as 3 seconds. Those skilled in the art can select a better value based on actual engineering debugging and experiments, and no restrictions are imposed here.

[0044] This invention addresses the issue from an external control perspective. The engine controller, combined with terrain prediction systems such as electronic horizon, predictively determines whether changes in the vehicle's external driving terrain can offset the torque fluctuations caused by cylinder deactivation. It aims to activate cylinder deactivation control at as many terrain change points as possible that meet the required conditions. Through terrain prediction assistance, the timing of cylinder deactivation is optimized, allowing torque fluctuations to offset changes in the external environment, resulting in a better user experience for this function.

[0045] Example 2:

[0046] The present invention also provides a vehicle cylinder deactivation prediction control terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the method embodiment described above in Embodiment 1 of the present invention.

[0047] Furthermore, as an executable solution, the vehicle cylinder deactivation prediction control terminal device can be a computing device such as an on-board computer or a cloud server. The vehicle cylinder deactivation prediction control terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that the above-described structure of the vehicle cylinder deactivation prediction control terminal device is merely an example and does not constitute a limitation on the vehicle cylinder deactivation prediction control terminal device. It may include more or fewer components than described above, or combine certain components, or different components. For example, the vehicle cylinder deactivation prediction control terminal device may also include input / output devices, network access devices, buses, etc., and this embodiment of the invention does not limit this.

[0048] Furthermore, as an executable solution, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. This processor is the control center of the vehicle cylinder deactivation predictive control terminal equipment, connecting all parts of the entire equipment via various interfaces and lines.

[0049] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the vehicle cylinder deactivation predictive control terminal device by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0050] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the methods described in the embodiments of the present invention.

[0051] If the modules / units integrated in the vehicle cylinder deactivation prediction control terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc.

[0052] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for predictive control of cylinder deactivation in a vehicle, characterized in that, Includes the following steps: S1: Based on historical data, obtain the torque fluctuation characteristic parameters when the vehicle engine cylinders are deactivated. The torque fluctuation characteristic parameters include the torque fluctuation amount and torque fluctuation time of the total torque. S2: During vehicle operation, monitor in real time whether a cylinder deactivation control signal is generated; S3: Upon receiving a cylinder deactivation control signal, cylinder deactivation control is performed based on the torque fluctuation characteristic parameters at the time of cylinder deactivation, the vehicle's current driving parameters, and the gradient of the road ahead. Step S3 specifically includes the following steps: S31: When a cylinder deactivation control signal is received, record the corresponding time as the cylinder deactivation signal start time T0, and initialize i=0; S32: Get T i The position d ahead of the vehicle on the road at any given time i =v i The slope of the road at point t , judge | - |Is the value less than the error threshold? If yes, execute engine cylinder deactivation and return to S2; otherwise, proceed to S33; where v i T represents i The vehicle speed at any given time, t represents the torque fluctuation time. T represents i Expected slope of the road ahead at any given moment; S33: Let i = i + 1, and determine T. i Check if the cylinder stop control signal is valid. If yes, proceed to S34; otherwise, return to S2. S34: Determine T i -Is T0 less than the forced control time threshold K? If yes, return to S32; otherwise, force engine cylinder deactivation and return to S2. T i Expected slope of the road ahead at any given time The calculation formula is: Where ΔT represents the torque ripple, j represents the overall transmission ratio from the engine to the drive wheels, η represents the efficiency of the transmission system, m represents the total mass of the vehicle, g represents the acceleration due to gravity, and r represents the radius of the vehicle's drive wheels. T represents i The gradient of the road where the vehicle is located at any given time.

2. The vehicle cylinder deactivation predictive control method according to claim 1, characterized in that: In step S1, the torque fluctuation characteristic parameters are obtained by the curve of the total torque changing over time when the cylinder is shut down.

3. The vehicle cylinder deactivation predictive control method according to claim 1, characterized in that: In step S2, the cylinder deactivation control signal is generated by the control logic of the engine controller.

4. The vehicle cylinder deactivation predictive control method according to claim 1, characterized in that: The slope of the road ahead was obtained using electronic horizon data.

5. A vehicle cylinder deactivation prediction control terminal device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any one of claims 1 to 4.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 4.

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