Urgent speed reducing and gear shifting control method and system of automatic transmission

A technology of automatic transmission and control method, applied in the direction of transmission control, elements with teeth, belt/chain/gear, etc., which can solve the problems of engine stalling, lagging vehicle deceleration, and inability to achieve engine braking, etc.

Active Publication Date: 2013-03-27
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the time required for the vehicle to shift gears, it is possible that the vehicle has decelerated to the next shift gear before the clutch starts to engage, which will cause the shifting process to always lag behind the deceleration of the vehicle, and eventua

Method used

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  • Urgent speed reducing and gear shifting control method and system of automatic transmission
  • Urgent speed reducing and gear shifting control method and system of automatic transmission
  • Urgent speed reducing and gear shifting control method and system of automatic transmission

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Under normal circumstances, the shift control of an automatic transmission car is based on figure 1 The gear shift schedule shown in the table automatically shifts gears, that is, shifts gears after reaching a certain basic critical speed value according to the accelerator opening and the current speed value. figure 1 The shift schedule shown in the table shows the basic critical speed value related to the throttle opening and gear position, and its unit is km / h. figure 1 The specific values ​​in the shift schedule table shown in are only used for schematic illustration, and are not used to limit the protection scope of the present invention. Such as figure 1 As shown, when the current throttle opening is 20%, when the current speed value exceeds 25 kilometers per hour, shift from 1st gear to 2nd gear. During the deceleration proces...

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PUM

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Abstract

The invention discloses an urgent speed reducing and gear shifting control method and system of an automatic transmission, which are used for controlling gear-shift jumping of a vehicle in case of slamming on the brake for speed reduction. The urgent speed reducing and gear shifting control method comprises the following steps of: acquiring multiple operating parameters of the vehicle in real time, wherein the multiple operating parameters at least include a current gear position, a brake signal and a current acceleration value a of the vehicle; calculating to obtain critical acceleration value a 0 based on the current gear position and preset gear shift time t; acquiring a target gear position according to a preset jump shift-down mode if the brake signal is available and the current acceleration value a is less than the critical acceleration value a 0, if not, acquiring the target gear position according to a normal shift-down mode; and carrying out gear shift from the current gear position to the target gear position on the vehicle.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a control method and system for rapid deceleration and shifting of an automatic transmission. Background technique [0002] When the vehicle is running, emergency braking may be required in some emergency situations. Under such rapid deceleration conditions, if the automatic transmission vehicle still shifts gears according to the normal shifting schedule, the vehicle will quickly and gradually downshift. Due to the time required for the vehicle to shift gears, it is possible that the vehicle has decelerated to the next shift gear before the clutch starts to engage, which will cause the shifting process to always lag behind the deceleration of the vehicle, and eventually lead to two results: If the clutch is forced to be engaged in the middle, the engine will be turned off; or if the clutch is not engaged, it is equivalent to the engine being in neutral during the rapid deceleration pr...

Claims

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Application Information

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IPC IPC(8): F16H59/50F16H59/48F16H61/02F16H61/18
Inventor 刘文忠陈勇罗大国赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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