Shift control method, system and computer-readable medium based on curve driving

Abstract

The present invention relates to a shift control method based on cornering driving, which specifically includes the following steps: S1. Determine whether the steering wheel of the vehicle deflects. If it does, go to step S2; S2. Determine whether the steering wheel of the vehicle returns to the initial position. If it does, go to step S3; S3. Based on the vehicle driving speed and the operation of the accelerator pedal opening, execute a downshift strategy, and determine whether the lateral acceleration value exceeds a preset threshold. If it does, increase the downshift point of the vehicle. Compared with the prior art, the present invention has the advantages of avoiding sharp changes in driving force, thus ensuring that the vehicle can smoothly drive out along the curved road line, effectively avoiding the danger of vehicle out of control, and improving the safety of the vehicle during driving, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle automatic transmissions, and more particularly to a shift control method, system, and computer-readable medium based on corner driving. Background Art

[0002] In recent years, more and more vehicles are equipped with automatic transmissions, and at the same time, the operability of vehicles has become more and more convenient. The vehicle automatic transmission will select the corresponding gear according to the change of the driver's accelerator pedal to meet the driving requirements.

[0003] For an automatic transmission, during vehicle driving, when the driver steps on the accelerator pedal beyond a certain change range, the automatic transmission will perform a downshift operation. Due to the change in the gear ratio between gears, the vehicle driving force will change sharply during the accelerator pedal downshift process. However, during cornering, if the driver steps on the accelerator pedal too hard, after the vehicle downshifts, due to the sharp change in the driving force, the vehicle is more difficult to control. For vehicles with a FF layout, understeer is likely to occur, and for vehicles with a FR layout, oversteer is likely to occur, posing a danger of loss of control to the driver. Summary of the Invention

[0004] An object of the present invention is to provide a shift control method, system, and computer-readable medium based on corner driving to overcome the defect that the vehicle is difficult to control due to the sharp change in driving force after downshifting during cornering in the prior art.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A shift control method based on corner driving specifically includes the following steps:

[0007] S1. Determine whether the vehicle's steering wheel deflects. If so, go to step S2;

[0008] S2. Determine whether the vehicle's steering wheel returns to the initial position. If so, go to step S3;

[0009] S3. Based on the vehicle driving speed and accelerator pedal opening operation, execute a downshift strategy, and determine whether the lateral acceleration value exceeds a preset threshold. If so, increase the vehicle's downshift point.

[0010] After the vehicle's downshift point is increased in step S3, the automatic transmission will not perform a downshift operation.

[0011] The types of the vehicle include vehicles with a FF layout and vehicles with a FR layout.

[0012] Further, when the vehicle triggers a downshift when exiting a corner, it will cause a sharp change in the driving force.

[0013] Furthermore, the vehicle with FF layout is prone to understeer when there is a sharp change in driving force.

[0014] Furthermore, the vehicle with FR layout is prone to oversteer when there is a sharp change in driving force.

[0015] When the vehicle enters a bend, a certain turning angle is generated, and when exiting the bend, a change in the operation speed of the throttle opening triggers a downshift.

[0016] A system using the above-described shift control method based on corner driving includes a steering detection module, a lateral acceleration module, and a gear control module;

[0017] The steering detection module detects whether the vehicle is entering a bend or about to exit a bend;

[0018] The lateral acceleration module detects whether the lateral acceleration of the vehicle exceeds a preset threshold;

[0019] The gear control module adjusts the gear according to the detection results of the steering detection module and the lateral acceleration module.

[0020] The gear control module is connected to the steering detection module and the lateral acceleration module. If the operation speed of the throttle opening does not reach the downshift point, the gear control module controls the gear of the vehicle to remain unchanged.

[0021] A computer-readable medium using the above-described shift control method based on corner driving, the control method is stored in the computer-readable medium in the form of a computer program, and when executed, it implements steps S1 to S3.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] According to the existing shift strategy of the automatic transmission, the present invention is a method for executing a downshift strategy based on the vehicle driving speed and the operation of the throttle pedal opening. When the driver performs a steering operation, the limit value of the lateral acceleration is added at the same time. If all conditions are set, the automatic transmission will not execute a downshift operation. In this way, the vehicle will not downshift when driving in a bend, avoiding a sharp change in driving force, thereby ensuring that the vehicle can smoothly drive out along the bend route, effectively avoiding the danger of vehicle out of control, and improving the safety of the vehicle during driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of the present invention;

[0025] Figure 2 is a schematic diagram of the vehicle entering a bend of the present invention;

[0026] Figure 3Schematic diagram of the throttle opening varying with time according to the present invention;

[0027] Figure 4 Schematic diagram of the throttle opening operation speed varying with time according to the present invention;

[0028] Figure 5 Schematic diagram of the gear position varying with time according to the present invention;

[0029] Figure 6 Schematic diagram of the driving force varying with time according to the present invention. Detailed implementation manners

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0031] Embodiment

[0032] As Figure 1 shown, a shift control method based on corner driving specifically includes the following steps:

[0033] S1. Determine whether the steering wheel of the vehicle deflects. If so, go to step S2;

[0034] S2. Determine whether the steering wheel of the vehicle returns to the initial position. If so, go to step S3;

[0035] S3. Based on the vehicle driving speed and the throttle pedal opening operation, execute a downshift strategy, and determine whether the lateral acceleration value exceeds a preset threshold. If so, increase the downshift point of the vehicle.

[0036] After the downshift point of the vehicle in step S3 is increased, the automatic transmission will not execute the downshift operation.

[0037] The types of vehicles include FF-layout vehicles and FR-layout vehicles.

[0038] Triggering a downshift when the vehicle exits a curve will cause a sharp change in the driving force.

[0039] FF-layout vehicles are prone to understeering when the driving force changes sharply.

[0040] FR-layout vehicles are prone to oversteering when the driving force changes sharply.

[0041] The vehicle generates a certain angle when entering a curve, and a change in the throttle opening operation speed when exiting the curve triggers a downshift.

[0042] A system using the shift control method based on corner driving includes a steering detection module, a lateral acceleration module, and a gear position control module;

[0043] A steering detection module that detects whether the vehicle is entering or about to exit a curve.

[0044] A lateral acceleration module that detects whether the lateral acceleration of the vehicle exceeds a preset threshold.

[0045] A gear control module that adjusts the gear according to the detection results of the steering detection module and the lateral acceleration module.

[0046] The gear control module is connected to the steering detection module and the lateral acceleration module. If the operation speed of the throttle opening does not reach the downshift point, the gear control module controls the gear of the vehicle to remain unchanged.

[0047] A computer-readable medium using a shift control method based on curve driving, where the control method is stored in the computer-readable medium in the form of a computer program and implements steps S1 to S3 when executed.

[0048] In specific implementation, as Figures 3 to 6 shown, when the vehicle turns into a curve, when approaching the exit of the curve, step on the accelerator. At the same time, the lateral acceleration value of the vehicle is used as a condition for the automatic transmission to downshift. At this time, when the lateral acceleration value exceeds a certain limit, the downshift point is increased, and the vehicle does not trigger the downshift point. Since the vehicle can maintain the same gear during driving when stepping on the accelerator, the driving force will not change sharply. At this time, the vehicle can smoothly maintain driving during the process of exiting the curve, avoiding the occurrence of vehicle out-of-control situations.

[0049] In addition, it should be noted that the specific embodiments described in this specification may have different names. The above content described in this specification is only an example of the structure of the present invention. Any equivalent changes or simple changes made according to the structure, features, and principles conceived by the present invention are included in the protection scope of the present invention. Those skilled in the art of the present invention can make various modifications, supplements, or use similar methods to the specific examples described, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, they should belong to the protection scope of the present invention.

Claims

1. A shift control method based on cornering driving, characterized in that, Specifically, it includes the following steps: S1. Determine whether the vehicle's steering wheel deflects. If so, go to step S2; S2. Determine whether the vehicle's steering wheel returns to the initial position. If so, go to step S3; S3. Based on the vehicle's driving speed and the opening degree of the accelerator pedal, execute a downshift strategy, and determine whether the lateral acceleration value exceeds a preset threshold. If so, increase the downshift point of the vehicle.

2. The shift control method based on corner driving according to claim 1, wherein, After the downshift point of the vehicle in step S3 is increased, the automatic transmission will not execute a downshift operation.

3. The shift control method based on cornering driving according to claim 1, characterized in that The types of the vehicle include vehicles with FF layout and vehicles with FR layout.

4. The shift control method based on cornering driving according to claim 3, wherein, When the vehicle triggers a downshift when exiting a curve, it will cause a sharp change in the driving force.

5. A shift control method based on cornering driving according to claim 4, characterized in that, When the driving force of the vehicle with FF layout changes sharply, understeer is likely to occur.

6. The shift control method based on cornering driving according to claim 4, characterized in that, When the driving force of the vehicle with FR layout changes sharply, oversteer is likely to occur.

7. A shift control method based on cornering driving according to claim 1, characterized in that When the vehicle enters a curve, it generates a certain angle of rotation, and when exiting the curve, a change in the operation speed of the accelerator pedal opening triggers a downshift.

8. A system using the shift control method based on corner driving as described in claim 1, characterized in that, It includes a steering detection module, a lateral acceleration module, and a gear control module; The steering detection module detects whether the vehicle enters or is about to exit a curve; The lateral acceleration module detects whether the lateral acceleration of the vehicle exceeds a preset threshold; The gear control module adjusts the gear according to the detection results of the steering detection module and the lateral acceleration module.

9. The shift control method based on cornering driving according to claim 8, wherein The gear control module is connected to the steering detection module and the lateral acceleration module. If the operation speed of the accelerator pedal opening does not reach the downshift point, the gear control module controls the gear of the vehicle to remain unchanged.

10. A computer-readable medium using the shift control method based on corner driving as described in claim 1, characterized in that, The control method is stored in a computer-readable medium in the form of a computer program, and when executed, it implements steps S1 to S3.

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