CN115614166A - Vehicle cylinder deactivation prediction control method, terminal device and storage medium - Google Patents
Vehicle cylinder deactivation prediction control method, terminal device and storage medium Download PDFInfo
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- CN115614166A CN115614166A CN202110789664.0A CN202110789664A CN115614166A CN 115614166 A CN115614166 A CN 115614166A CN 202110789664 A CN202110789664 A CN 202110789664A CN 115614166 A CN115614166 A CN 115614166A
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- 230000009849 deactivation Effects 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 5
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- 238000004590 computer program Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 6
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- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 10
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- 238000002474 experimental method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/702—Road conditions
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention relates to a vehicle cylinder deactivation prediction control method, terminal equipment and a storage medium, wherein the method comprises the following steps: s1: according to historical data, torque fluctuation characteristic parameters of the vehicle engine during cylinder deactivation are obtained, wherein the torque fluctuation characteristic parameters comprise torque fluctuation amount and torque fluctuation time of total torque; s2: monitoring whether a cylinder deactivation control signal is generated in real time in the running process of the vehicle; s3: and when the cylinder deactivation control signal is received, performing cylinder deactivation control according to the torque fluctuation characteristic parameter during cylinder deactivation, the current running parameter of the vehicle and the slope values of the current road and the road ahead. The invention adopts external conditions for auxiliary control, can offset cylinder stopping torque fluctuation by using the moment of terrain change, improves the economical efficiency and applicability of the stopping control, and optimizes the user experience.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to a vehicle cylinder deactivation prediction control method, terminal equipment and a storage medium.
Background
In the condition of low load of the vehicle, the cylinder deactivation of partial cylinders of the engine can reduce the number of cylinders for fuel injection and increase the load rate of cylinders which are not deactivated so as to improve the fuel efficiency, so that the cylinder deactivation technology can effectively improve the energy consumption economy of the automobile. However, at the moment of cylinder deactivation, the cylinder which stops working does not produce torque output suddenly, the total torque drops instantly, and the cylinder which keeps working is difficult to reach and compensate the missing torque after cylinder deactivation instantly, so that the total torque fluctuation is caused, the driving discomfort is caused, the driving stability is influenced, and the experience of a driver user is reduced. The total torque drop phenomenon is that the air inlet pressure is gradually increased along with the opening of the throttle valve, the torque output of the working cylinder is increased, the compensation can be realized only by the torque output of the working cylinder after about two working cycles, and the total torque is recovered to the level before cylinder deactivation. The conventional method optimizes the cylinder deactivation effect from the viewpoint of internal control to reduce torque fluctuation, such as optimizing the throttle opening, the injection angle control, and the like.
Disclosure of Invention
In order to solve the above problems, the present invention proposes a vehicle cylinder deactivation prediction control method, a terminal device, and a storage medium.
The specific scheme is as follows:
a vehicle cylinder deactivation prediction control method comprising the steps of:
s1: according to historical data, torque fluctuation characteristic parameters of the vehicle engine during cylinder deactivation are obtained, wherein the torque fluctuation characteristic parameters comprise torque fluctuation amount and torque fluctuation time of total torque;
s2: monitoring whether a cylinder deactivation control signal is generated in real time in the running process of the vehicle;
s3: and when the cylinder deactivation control signal is received, performing cylinder deactivation control according to the torque fluctuation characteristic parameter during cylinder deactivation, the current running parameter of the vehicle and the slope values of the current road and the road ahead.
Further, the torque fluctuation characteristic parameter in step S1 is obtained from a time-dependent change curve of the total torque at the time of cylinder deactivation.
Further, the cylinder deactivation control signal in step S2 is generated by the control logic judgment of the engine controller.
Further, step S3 specifically includes the following steps:
s31: when the cylinder deactivation control signal is received, recording the corresponding moment as the cylinder deactivation signal starting moment T 0 Initialization setting i =0;
s32: obtaining T i At any moment in front of the position of the road on which the vehicle is located d i ＝v i Gradient value of road at t' i Judging | theta' i -θ″ i If I is smaller than the error threshold, executing engine cylinder deactivation and returning to S2; otherwise; proceeding to S33; wherein v is i Represents T i At the moment, the speed of the vehicle, t, represents the torque fluctuation time, θ ″ i Represents T i The expected value of the gradient of the road ahead at the moment;
s33: let i = i +1, judge T i Whether the cylinder deactivation control signal is effective at the moment is judged, if yes, the operation goes to S34; otherwise, returning to S2;
s34: determine T i -T 0 Whether the time is smaller than the forced control time threshold K or not is judged, if yes, the step returns to S32; otherwise, forcibly executing the engine cylinder deactivation and returning to S2.
Further, T i Expected value of road slope θ ″' ahead of time i The calculation formula of (2) is as follows:
θ″ i ＝arcsin(ΔTjη/mgr)+θ i
where Δ T represents the amount of torque fluctuation, j represents the total transmission ratio of the vehicle 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 gravitational acceleration, r represents the radius of the drive wheels of the vehicle, θ i Represents T i The grade value of the road on which the vehicle is located at the moment.
Further, the grade value of the front road is obtained by adopting electronic horizon data.
A vehicle cylinder deactivation predictive control terminal device comprising a processor, a memory and a computer program stored in said memory and executable on said processor, said processor implementing the steps of the method as described above in embodiments of the invention when executing said computer program.
A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as described above for an embodiment of the invention.
According to the technical scheme, the auxiliary control is carried out by adopting external conditions, the cylinder stopping torque fluctuation can be counteracted by utilizing the moment of terrain change, the economical efficiency and the applicability of the stopping control are improved, and the user experience is optimized.
Drawings
Fig. 1 is a flowchart of a first embodiment of the invention.
Fig. 2 is a graph showing the change in total torque with time during cylinder deactivation in this embodiment.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The first embodiment is as follows:
the embodiment of the invention provides a vehicle cylinder deactivation prediction control method, which comprises the following steps of:
s1: and acquiring torque fluctuation characteristic parameters when the engine of the vehicle is deactivated according to the historical data, wherein the torque fluctuation characteristic parameters comprise a torque fluctuation amount delta T and a torque fluctuation time T of the total torque.
As shown in fig. 2, the torque fluctuation amount Δ T and the torque fluctuation time T can be obtained from the time-dependent change profile of the total torque at the time of cylinder deactivation in the history data.
S2: and monitoring whether a cylinder deactivation control signal is generated in real time during the running process of the vehicle.
The cylinder deactivation control signal is generated by the judgment of the original control logic of an Engine Controller (ECU).
S3: and when the cylinder deactivation control signal is received, performing cylinder deactivation control according to the torque fluctuation characteristic parameter during cylinder deactivation, the current running parameter of the vehicle and the slope values of the current road and the road ahead.
The specific implementation steps of step S3 in this embodiment are as follows:
s31: when the cylinder deactivation control signal is received, recording the corresponding moment as the cylinder deactivation signal starting moment T 0 Initialization setting i =0.
S32: obtaining T i At any moment in front of the position of the road on which the vehicle is located d i ＝v i Gradient value of road at t' i Judging | theta' i -θ″ i If the | is smaller than the error threshold, executing engine cylinder deactivation and returning to S2; otherwise; the process proceeds to S33. Wherein v is i Represents T i At the moment, the speed of the vehicle, t, represents the torque fluctuation time, θ ″ i Represents T i The ahead road grade desired value at time.
The error threshold is a smaller value, such as 0.005, and those skilled in the art can select a better value according to practical engineering debugging and experiments, etc., without limitation.
When | theta 'is satisfied' i -θ″ i And if the I is smaller than the error threshold, the current starting cylinder deactivation is appropriate, the engine cylinder deactivation can be executed, and the torque fluctuation can be approximately and exactly offset due to terrain change, so that the driving experience is optimized.
T i Expected value of road slope θ ″' ahead of time i The calculation principle of (1) is as follows:
setting T i The slope value of the road on which the vehicle is located at the time is theta i Then T is i The difference value of the slope values of the road in front of the vehicle and the road where the vehicle is located at the moment is theta ″ i -θ i The total vehicle torque demand difference due to terrain is: mgsin (θ ″) i -θ i ) Where m represents the total mass of the vehicle and g represents the gravitational acceleration. Since the instantaneous torque fluctuation amount of the output torque at the time of engine deactivation is Δ T, the power transmitted through the transmission system to drive the vehicle is: Δ Ti η/r, where i represents the total transmission ratio of the vehicle from the engine to the drive wheels and η represents the efficiency of the transmission system, is typically fixed, e.g., 0.9, r represents the radius of the drive wheels of the vehicle. When the total torque demand difference of the vehicle due to terrain change is the same as the engine torque fluctuation caused by cylinder deactivation, the driving feeling influence on the driverSmaller, therefore Δ Tj η/r = mg sin (θ ″) i -θ i ) Finishing to obtain theta ″ i ＝arcsin(ΔTjη/mgr)+θ i 。
S33: let i = i +1, judge T i Whether the cylinder deactivation control signal is effective at the moment is judged, if yes, the operation goes to S34; otherwise, return to S2.
S34: judgment of T i -T 0 Whether the time is smaller than the forced control time threshold K or not is judged, if yes, the step returns to S32; otherwise, forcibly executing the engine cylinder deactivation and returning to S2.
The forced control time threshold K is usually a short time, such as 3 seconds, and those skilled in the art can select a better value according to actual engineering debugging, experiments, and the like, which is not limited herein.
Starting from the external control angle, the embodiment of the invention predictively judges whether the driving terrain change outside the vehicle can counteract the torque fluctuation of cylinder deactivation by combining an engine controller with a terrain prediction system such as an electronic horizon and the like, and selects the terrain change point meeting the conditions to start the cylinder deactivation control as much as possible. Through terrain prediction assistance, the optimal selection of cylinder deactivation time points is realized, the torque fluctuation is offset with the external environment change, and the function obtains better user experience.
Example two:
the invention also provides vehicle cylinder deactivation prediction control terminal equipment, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method embodiment of the first embodiment of the invention.
Further, as an executable solution, the vehicle cylinder deactivation prediction control terminal device may be a computing device such as an in-vehicle computer, a cloud server, and the like. The vehicle cylinder deactivation prediction control terminal device can include, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the above-mentioned constituent structure of the vehicle cylinder deactivation prediction control terminal device is only an example of the vehicle cylinder deactivation prediction control terminal device, and does not constitute a limitation on the vehicle cylinder deactivation prediction control terminal device, and may include more or less components than the above, or combine some components, or different components, for example, the vehicle cylinder deactivation prediction control terminal device may further include an input-output device, a network access device, a bus, etc., which is not limited in this embodiment of the present invention.
Further, as an executable solution, the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, and the like. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor is a control center of the vehicle cylinder deactivation prediction control terminal device, and various interfaces and lines are used to connect various parts of the entire vehicle cylinder deactivation prediction control terminal device.
The memory may be used to store the computer program and/or module, and the processor may implement various functions of the vehicle cylinder deactivation prediction control terminal device by operating or executing the computer program and/or module stored in the memory and calling data stored in the memory. The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the mobile phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The present invention also provides a computer-readable storage medium, which stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method of an embodiment of the present invention.
The module/unit integrated with the vehicle cylinder deactivation predictive control terminal device may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), software distribution medium, and the like.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A vehicle cylinder deactivation prediction control method characterized by comprising the steps of:
s1: according to historical data, torque fluctuation characteristic parameters of the vehicle engine during cylinder deactivation are obtained, wherein the torque fluctuation characteristic parameters comprise torque fluctuation amount and torque fluctuation time of total torque;
s2: monitoring whether a cylinder deactivation control signal is generated in real time in the running process of the vehicle;
s3: and when the cylinder deactivation control signal is received, performing cylinder deactivation control according to the torque fluctuation characteristic parameter during cylinder deactivation, the current running parameter of the vehicle and the slope values of the current road and the road ahead.
2. The vehicle cylinder deactivation prediction control method according to claim 1, characterized in that: in the step S1, the torque fluctuation characteristic parameter is obtained through a variation curve of the total torque along with time when the cylinder is stopped.
3. The vehicle cylinder deactivation prediction control method according to claim 1, characterized in that: the cylinder deactivation control signal in step S2 is generated by judgment of the control logic of the engine controller.
4. The vehicle cylinder deactivation prediction control method according to claim 1, characterized in that: the step S3 specifically includes the following steps:
s31: when a cylinder deactivation control signal is received, recording the corresponding moment as the cylinder deactivation signal starting moment T 0 Initialization setting i =0;
s32: obtaining T i At any moment in front of the position of the road on which the vehicle is located d i ＝v i Slope value of road at t' i Judging | theta' i -θ″ i If the | is smaller than the error threshold, executing engine cylinder deactivation and returning to S2; otherwise; proceeding to S33; wherein v is i Represents T i At the moment, the speed of the vehicle, t, represents the torque fluctuation time, θ ″ i Represents T i The expected value of the gradient of the road ahead at the moment;
s33: let i = i +1, judge T i Whether the cylinder deactivation control signal is effective at the moment is judged, if yes, the operation goes to S34; otherwise, returning to S2;
s34: judgment of T i -T 0 Whether the time is smaller than the forced control time threshold K or not is judged, if yes, the step returns to S32; otherwise, forcibly executing the engine cylinder deactivation and returning to S2.
5. The vehicle cylinder deactivation prediction control method according to claim 4, characterized in that: t is i Expected value of road slope θ ″' ahead of time i The calculation formula of (c) is:
θ″ i ＝arcsin(ΔTjη/mgr)+θ i
where Δ T represents the amount of torque ripple, j represents the total gear ratio of the vehicle 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 gravitational acceleration, r represents the radius of the vehicle drive wheels, θ i Represents T i The grade value of the road on which the vehicle is located at the moment.
6. The vehicle cylinder deactivation prediction control method according to claim 1, characterized in that: the grade value of the front road is acquired by adopting electronic horizon data.
7. A vehicle cylinder deactivation prediction control terminal device characterized by: comprising a processor, a memory and a computer program stored in said memory and running on said processor, said processor implementing the steps of the method according to any one of claims 1 to 6 when executing said computer program.
8. A computer-readable storage medium storing a computer program, characterized in that: the computer program realizing the steps of the method as claimed in any one of claims 1 to 6 when executed by a processor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115875141A (en) * | 2023-02-23 | 2023-03-31 | 潍柴动力股份有限公司 | Cylinder deactivation path determining method, device, equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115875141A (en) * | 2023-02-23 | 2023-03-31 | 潍柴动力股份有限公司 | Cylinder deactivation path determining method, device, equipment and storage medium |
| CN115875141B (en) * | 2023-02-23 | 2023-05-23 | 潍柴动力股份有限公司 | Cylinder deactivation path determining method, device, equipment and storage medium |
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