Automatic transmission shifting strategy correcting method

A technology of automatic transmission and shifting strategy, applied in the direction of transmission control, elements with teeth, belt/chain/gear, etc., can solve the problem of continuous up-shift and other problems that cannot be eliminated

Inactive Publication Date: 2020-07-03
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no matter what kind of shift strategy is based on, the problem of continuous up and down shifts caused by driving habits cannot be eliminated

Method used

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  • Automatic transmission shifting strategy correcting method
  • Automatic transmission shifting strategy correcting method

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Embodiment Construction

[0014] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] figure 1 It is a flow chart of a method for modifying the shift strategy of an automatic transmission, such as figure 1 As shown, a method for correcting the shift strategy of an automatic transmission includes:

[0016] 1. First power on, system initialization, and the program starts to execute periodically; 2. Collect signals such as engine speed, accelerator opening, vehicle speed, current gear and target gear; 3. Confirm the current shift process and type, divided into up and down downshift and downshift; downshift is divided into two modes: power downshift and non-power downshift. Power downshift mode, when the throttle opening is greater than or equal to 30%, the downshift is power downshift mode); 4. Wh...

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Abstract

The invention relates to an automatic transmission shifting strategy correcting method. The method includes the steps that the rotating speed of an engine, the opening degree of an accelerator, the vehicle speed, the current gear and targeted gear signals are collected; when the shifting process refers to upshifting, timekeeping is conducted to the next downshifting after the shifting process is ended, and when the downshifting refers to power downshifting and the kept time is smaller than a time threshold value, an upshifting curve at the current gear is increased; when the condition is not met, the upshifting curve at the current gear is unchanged; when an automatic transmission is in a downshifting state and the downshifting refers to power downshifting, delayed upshifting is conducted;and when the automatic transmission is downshifted to be in an unpowered downshifting state, the upshifting curve is unchanged. According to the automatic transmission shifting strategy correcting method disclosed by the invention, the problems of shifting impact and power deficiency caused by shifting strategies in the travelling process of an automatic transmission vehicle are solved, and the shifting strategies of the automatic transmission are optimized.

Description

technical field [0001] The invention relates to a shift strategy technology of an automatic transmission, in particular to a method for correcting a shift strategy of an automatic transmission. Background technique [0002] Shifting strategy is the core technology of automatic transmission research, which is directly related to the power, economy and comfort of the car. Studies have shown that the most influential factors for shifting strategies are slope and load quality, especially for commercial vehicles with large load changes and variable driving conditions. These two factors will lead to frequent gear shifting; automatic transmission gear selection Improper fit can also lead to problems such as poor fuel economy and deterioration of the overall performance of the vehicle. Due to the driver's driving habits, the vehicle will also have the problem of continuous up and down gears, which will have a more obvious impact on the comfort, fuel economy and power of the vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H61/04
CPCF16H61/0213F16H61/04F16H2061/022F16H2061/0459
Inventor 刘振杰王叶王佳婧宋振川于艳秋徐飞韩宇石李志伟李翠芬钟超杰李晋
Owner CHINA NORTH VEHICLE RES INST
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