Automatic transmission crawl start control system and method

A technology of automatic transmission and crawling start, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as weak starting, abnormal vehicle stall, violent vibration, etc., to reduce the probability of engine stall , Improve the effect of starting safety and smooth and stable starting functions

Active Publication Date: 2016-09-21
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The starting control strategy is directly related to the smoothness and safety of the vehicle starting. Improper starting control methods will cause abnormal stalling of the automatic transmission vehicle, excessive vibration during the starting process of the vehicle, or weak starting.

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  • Automatic transmission crawl start control system and method
  • Automatic transmission crawl start control system and method
  • Automatic transmission crawl start control system and method

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Embodiment Construction

[0021] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of specific implementation methods, the technical means and effects of the present invention to achieve the intended purpose can be understood more deeply and specifically, but the attached drawings are only for reference and description, and are not used to explain the present invention limit.

[0023] figure 1 It is a schematic diagram of the principle of the crawl start control system of the automati...

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Abstract

The invention discloses a crawl-starting control system of an automatic transmission. The crawl-starting control system of the automatic transmission comprises a variable speed control unit and an engine control unit, wherein the variable speed control unit receives a braking pressure signal and an accelerator opening degree signal in real time after a gear bar is switched to a traveling gear or to a reverse gear, the variable speed control unit controls clutch pressure to be increased gradually when braking pressure is relieved gradually and sends a clutch input torque signal to the engine control unit when the accelerator opening degree is smaller than a given crawl-starting range value, and the engine control unit adjusts engine idling torque in real time according to clutch input torque. The crawl-starting control system of the automatic transmission adjusts the clutch pressure and the engine idling torque through the interactive and cooperative control of the engine control unit and the variable speed control unit, effectively reduces the probability of the stalling of an engine, achieves smooth and steady starting, and effectively improves the safety of the starting.

Description

technical field [0001] The invention relates to the technical field of automatic transmission, in particular to the control technology related to the starting control strategy in the automatic transmission. Background technique [0002] In the current automatic transmission, the launch control strategy is a very important part of the control strategy. The starting control strategy is directly related to the smoothness and safety of the vehicle starting. Improper starting control methods will cause abnormal stalling of the automatic transmission vehicle, excessive vibration during the starting process of the vehicle, or weak starting. Crawling start refers to the driver's way of starting without stepping on the accelerator. Due to the limitation of idle torque, as the clutch pressure increases, the probability of stalling and rough start also increases. Contents of the invention [0003] The invention provides a crawl start control system and method of an automatic transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/18F16H59/54F16H59/34
Inventor 倪为陈勇罗大国刘文忠冯擎峰
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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