Gear shift strategy correction method, controller, transmission and motor vehicle

Abstract

The present invention relates to a shift strategy correction method, a controller, a transmission and a motor vehicle, comprising the following steps: obtaining the current vehicle speed and the current engine speed; within a set time period, if the change amount of the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is reduced by a second set value; the current engine speed is greater than the changed upshift speed threshold, or less than the changed downshift speed threshold, and the gear is shifted. The change amount of the vehicle speed within the set time period is used to temporarily change the engine's shift speed threshold, and then the shift action is performed according to the current engine speed, so that the shift action caused by the vehicle speed fluctuation does not occur frequently, the action frequency of the transmission is reduced, the additional wear is reduced, the vehicle speed curve is smoother, and the comfort is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a shift strategy correction method, a controller, a transmission and a motor vehicle. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The automatic transmission on the vehicle controls the mechanical structure of the transmission to shift up or down by inputting the engine's throttle opening and the vehicle's current speed. For a running vehicle, there is a set of shift lines. When the vehicle is at a certain set threshold speed, the transmission action performs upshift or downshift, that is, the shift strategy.

[0004] Taking upshifting as an example, the vehicle will immediately upshift after reaching the speed threshold point. The vehicle speed changes dynamically due to various reasons such as road conditions, its own performance, driving habits and emergencies. The threshold speed in the current shifting strategy is a set of point values. After upshifting, if the vehicle speed decreases and crosses the speed threshold point of the shift line, the transmission will be activated again to downshift. Frequent action of the transmission will cause speed fluctuations. Conversely, speed fluctuations will also cause the transmission to frequently perform gear shifting actions, accelerating the wear of the transmission and reducing its lifespan. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a shift strategy correction method, a controller, a transmission and a motor vehicle, which utilizes the change in vehicle speed within a set time period to temporarily change the engine's shift speed threshold and then execute the shift action.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a shift strategy correction method, comprising the following steps:

[0008] Get the current vehicle speed and current engine speed;

[0009] Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value;

[0010] If the current engine speed is greater than the changed upshift speed threshold or less than the changed downshift speed threshold, the gear is shifted.

[0011] If the current vehicle speed changes beyond the set range within the set time period, shift gears.

[0012] A second aspect of the present invention provides a controller for implementing the above method, comprising:

[0013] Get the current vehicle speed and current engine speed;

[0014] Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value;

[0015] If the current engine speed is greater than the changed upshift speed threshold or less than the changed downshift speed threshold, a shift command is output.

[0016] If the change in the current vehicle speed exceeds the set range within the set time period, a shift command is output.

[0017] The first set value does not exceed 5% of the original upshift speed threshold, and the second set value does not exceed 5% of the original downshift speed threshold.

[0018] A third aspect of the present invention provides a transmission connected to the above-mentioned controller to execute the shift strategy correction method in the preceding steps.

[0019] The transmission is an automatic transmission or a manual transmission.

[0020] A fourth aspect of the present invention provides a motor vehicle equipped with the above-mentioned controller and transmission.

[0021] The controller may be an onboard computer.

[0022] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0023] The change in vehicle speed within a set time period is used to temporarily change the engine's gear shift speed threshold, and then the gear shift action is executed according to the engine's current speed. This makes the gear shift action caused by vehicle speed fluctuations no longer occur frequently, reducing the frequency of transmission action, reducing additional wear, making the vehicle speed curve smoother, and improving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic diagram of a shift strategy correction process provided by one or more embodiments of the present invention;

[0026] Figure 2 is a schematic diagram of a curve of a vehicle gear position and a vehicle speed before correction provided by one or more embodiments of the present invention;

[0027] Figure 3 It is a schematic diagram of a curve of a modified vehicle gear position and vehicle speed provided by one or more embodiments of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] The transmission is a speed-changing device used to coordinate the engine output speed and the actual driving speed of the wheels. It is used to bring out the best performance of the engine. By shifting gears, the engine can work at its best power performance state. The transmission can change the engine output speed, which affects the vehicle speed. The vehicle speed is affected by the transmission gear position, throttle opening, road conditions, vehicle performance and driving habits. Therefore, when the transmission performs automatic shifting, it will comprehensively consider multiple parameters such as the current vehicle speed, engine output speed and throttle opening.

[0032] The shift strategy refers to the transmission action to perform upshift or downshift when the vehicle is at a certain set threshold speed. As described in the background technology, the vehicle speed changes dynamically, and the threshold speed in the current shift strategy is a point value. After the transmission upshifts, if the vehicle speed decreases and crosses the speed threshold point of the shift line, the transmission will be activated again to perform downshift. The frequent action of the transmission will cause the vehicle speed to fluctuate. Conversely, the vehicle speed fluctuation will also cause the transmission to frequently perform shift actions, which will accelerate the wear of the transmission and reduce the life of the vehicle.

[0033] Therefore, the following embodiments provide a shift strategy correction method, a controller, a transmission and a motor vehicle, which utilize the change in vehicle speed within a set time period to temporarily change the engine's shift speed threshold and then execute the shift action.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, a shift strategy correction method includes the following steps:

[0036] Get the current vehicle speed and current engine speed;

[0037] Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value;

[0038] If the current engine speed is greater than the changed upshift speed threshold or less than the changed downshift speed threshold, the gear is shifted.

[0039] If the current vehicle speed changes beyond the set range within the set time period, shift gears.

[0040] In this embodiment:

[0041] When the vehicle is driving, there is a fluctuation of b km / h. ① When the vehicle speed as (which can be at least 5s) fluctuates less than or equal to bkm / h, the shift correction strategy is executed as follows:

[0042] The upshift speed is increased by c rpm and the downshift speed is reduced by d rpm, which controls up and downshifts and solves the problem of frequent gear shifting caused by crossing the up and down gear line back and forth;

[0043] ② When the vehicle speed fluctuation within as is greater than b km / h, the original shifting strategy is executed.

[0044] Specific:

[0045] When the vehicle is driving, there are fluctuations of up and down km / h. For example, the difference between the vehicle speed at time T and the vehicle speed at time T+5 (seconds) is 4km / h, that is, the upshift speed threshold and the downshift speed threshold are changed when it does not exceed 4km / h.

[0046] The speed is increased by c rpm for upshifts and decreased by d rpm for downshifts. For example, the speed is increased by c rpm for upshifts and decreased by d rpm for downshifts by no more than 5%.

[0047] like Figure 2 As shown, before the correction, when the vehicle is driving, the fluctuation of vehicle speed will cause the engine speed to fluctuate around the shift line, and the upshift and downshift actions will occur frequently.

[0048] like Figure 3 As shown, after the correction, the gear shifting action caused by vehicle speed fluctuations no longer occurs frequently, which reduces the frequency of transmission action, reduces additional wear, makes the vehicle speed curve smoother, and improves comfort.

[0049] Embodiment 2:

[0050] This embodiment provides a controller for implementing the above-mentioned shift strategy correction method, including:

[0051] Get the current vehicle speed and current engine speed;

[0052] Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value;

[0053] If the current engine speed is greater than the changed upshift speed threshold or less than the changed downshift speed threshold, a shift command is output.

[0054] If the change in the current vehicle speed exceeds the set range within the set time period, a shift command is output.

[0055] The change in vehicle speed within a set time period is used to temporarily change the engine's gear shift speed threshold, and then the gear shift action is executed according to the engine's current speed. This makes the gear shift action caused by vehicle speed fluctuations no longer occur frequently, reducing the frequency of transmission action, reducing additional wear, making the vehicle speed curve smoother, and improving comfort.

[0056] Embodiment three:

[0057] This embodiment provides a transmission for executing the above-mentioned shift strategy correction method, including being connected to the controller described in the second embodiment.

[0058] The change in vehicle speed within a set time period is used to temporarily change the engine's gear shift speed threshold, and then the gear shift action is executed according to the engine's current speed. This makes the gear shift action caused by vehicle speed fluctuations no longer occur frequently, reducing the frequency of transmission action, reducing additional wear, making the vehicle speed curve smoother, and improving comfort.

[0059] Embodiment 4:

[0060] This embodiment provides a motor vehicle, which is equipped with the controller in the second embodiment and the transmission in the third embodiment.

[0061] The change in vehicle speed within a set time period is used to temporarily change the engine's gear shift speed threshold, and then the gear shift action is executed according to the engine's current speed. This makes the gear shift action caused by vehicle speed fluctuations no longer occur frequently, reducing the frequency of transmission action, reducing additional wear, making the vehicle speed curve smoother, and improving comfort.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shift strategy correction method, characterized in that: include: Get the current vehicle speed and current engine speed; Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value; The current engine speed is greater than the changed upshift speed threshold, or less than the changed downshift speed threshold, and the gear is changed; If the current vehicle speed changes beyond the set range within the set time period, the gear will be changed; The first set value does not exceed 5% of the original upshift speed threshold, and the second set value does not exceed 5% of the original downshift speed threshold.

2. A shift strategy correction controller, characterized in that: is configured as: Get the current vehicle speed and current engine speed; Within a set time period, if the change in the current vehicle speed is within a set range, the engine upshift speed threshold is increased by a first set value, and the engine downshift speed threshold is decreased by a second set value; The current engine speed is greater than the changed upshift speed threshold, and a gear shift command is output; The current engine speed is less than the changed downshift speed threshold, and a gear shift command is output; If the change in the current vehicle speed exceeds the set range within the set time period, a shift command is output; The first set value does not exceed 5% of the original upshift speed threshold, and the second set value does not exceed 5% of the original downshift speed threshold.

3. A transmission, characterized in that: The invention comprises a transmission body, which is connected to the controller described in claim 2 and receives and executes a gear shift instruction.

4. A transmission as claimed in claim 3, characterized in that: The transmission is an automatic transmission or a manual transmission.

5. A motor vehicle, characterized in that: The controller of claim 3 and the transmission of claim 4 are installed.

6. A motor vehicle as claimed in claim 5, characterized in that: The controller is an on-board computer.

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