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Achieving method for controlling gear selecting and shifting of double-clutch transmission through rotating speed request

An automatic transmission, request control technology, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as difficult control, and achieve the effect of fast synchronous response

Active Publication Date: 2016-04-20
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the speed of the engine is nonlinear and difficult to control

Method used

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  • Achieving method for controlling gear selecting and shifting of double-clutch transmission through rotating speed request
  • Achieving method for controlling gear selecting and shifting of double-clutch transmission through rotating speed request
  • Achieving method for controlling gear selecting and shifting of double-clutch transmission through rotating speed request

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] Such as figure 1 , 2 As shown, this embodiment includes the following steps:

[0029] 1) After entering the manual mode for downshifting without throttle, the torque value of the pre-separation clutch (referred to as Offgoing clutch for short) is compared in real time with the threshold for downshifting without throttle.

[0030] The throttle-free downshift threshold is distinguished according to the gear position. In order to ensure that the offgoing clutch drags the engine when speeding up, it is necessary to ensure that the torque value of the offgoing clutch reaches the torque value when the pre-combination point is reached. In this embodiment The no-throttle downshift threshold in is [-2,2].

[0031] When the torque value of the Offgoing clutch is lower than the no-throttle downshift threshold, the speed request flag is set to 1, and the speed request is activated. The activation of the rotational speed request is not limited to the states of the two clutches, w...

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Abstract

The invention discloses an achieving method for controlling gear selecting and shifting of a double-clutch transmission through a rotating speed request. The method includes the steps that when a traveling working condition is changed, the speed of an engine is directly adjusted through the rotating speed request, and therefore rapid synchronizing between the rotating speed of the engine and the rotating speed of a shaft where a pre-combined gear is located is accurately controlled. A speed adjusting method specifically includes the steps of a rotating speed request initialization phase, a rotating speed request activating phase and a rotating speed returning section. By means of the achieving method, synchronous responses are faster while synchronizing between the rotating speed of the engine and the rotating speed of the pre-combined shaft can be accurately controlled.

Description

technical field [0001] The invention relates to a technology in the field of an automobile dual-clutch automatic transmission, in particular to a method for realizing gear selection and shifting of a dual-clutch automatic transmission controlled by speed requests. Background technique [0002] Dual clutch automatic transmission (Double Clutch Transmission, DCT) has two clutches as its name implies, and odd gears and even gears are controlled by two clutches respectively. Dual-clutch transmission combines the advantages of manual transmission and automatic transmission. Instead of using a torque converter, it uses two sets of clutches. Through the alternate work of the two sets of clutches, the effect of gapless gear shifting is achieved. [0003] Compared with ordinary manual transmissions, the control of dual-clutch automatic transmissions is more complicated, and precise control is required for the selection and shifting process. At the same time, the power matching betwe...

Claims

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Application Information

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IPC IPC(8): F16H61/02
CPCF16H61/0204
Inventor 董志军李欢讯吴玉松任飞多
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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