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Creeping control method for wet-type double-clutch automatic speed changer

A technology of wet dual clutch and automatic transmission, which is applied in the direction of transmission control, toothed components, belt/chain/gear, etc. It can solve the problems of crawling response delay, engine flameout, poor smoothness, etc., and achieve fast and stable crawling, The effect of preventing flameout and avoiding risks

Active Publication Date: 2017-09-05
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the crawl start process, the vehicle speed is controlled by controlling the clutch. If the control method is improper, it will lead to slow crawl response, poor smoothness, and even cause the engine to stall.

Method used

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  • Creeping control method for wet-type double-clutch automatic speed changer
  • Creeping control method for wet-type double-clutch automatic speed changer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment provides a creeping control method for a wet dual-clutch automatic transmission, which includes:

[0017] S10. When the shift handle is placed in forward gear or reverse gear, and both the brake pedal and the accelerator pedal are in a released state, the control system judges that the vehicle is in a creeping phase.

[0018] The crawling control method for wet dual-clutch automatic transmission of this embodiment controls the vehicle when the vehicle is crawling. At this time, the control system can be a TCU, that is, the wet dual-clutch automatic transmission of the vehicle is realized through the TCU. The control of the transmission, thereby controlling the crawling of the vehicle.

[0019] S20. When the vehicle enters the crawling stage, if the current clutch torque is higher than the set value, it will directly enter the crawling speed control stage; if the clutch torque is lower than the set value, the clutch torque will rise to the clutch torque s...

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Abstract

The invention discloses a creeping control method for a wet-type double-clutch automatic speed changer. The creeping method comprises the steps that firstly, when a gear shifting handle is arranged at a front gear or a reverse gear and a brake pedal and an accelerator pedal are in a loosening state, a control system judges whether a vehicle is in a creeping stage or not; secondly, when the vehicle enters the creeping stage, if the current clutch torque is higher than a set value, the vehicle directly enters a creeping speed control stage, and if the clutch torque is lower than the set value, the clutch torque is controlled to be increased to a clutch torque set value according to a set rate, and the vehicle enters the creeping speed control stage. Compared with the prior art, the creeping control method has the beneficial effects that in the creeping process of the double-clutch automatic speed changer, by means of the closed-loop feedback control over the clutch rotating speed, rapid and stable creeping can be achieved, in the closed-loop control process, the rotating speed change rate of an engine is detected in real time, risks are avoided in advance, and engine stalling is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of wet dual-clutch automatic transmission control, and relates to a creep control method for a wet dual-clutch automatic transmission. Background technique [0002] The creep-start function of the wet dual-clutch automatic transmission refers to the crawl-start mode of the vehicle when the accelerator opening is zero. In the crawl start process, the speed of the vehicle is controlled by controlling the clutch. If the control method is improper, it will lead to slow crawl response, poor smoothness, and even cause the engine to stall. [0003] The patent with publication number CN103256383A proposes a creeping control method for an automatic transmission, in which the engine control unit adjusts the engine idle torque in real time according to the clutch input torque, and avoids engine stall by increasing the engine idle torque. Contents of the invention [0004] The object of the present invention is to pr...

Claims

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Application Information

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IPC IPC(8): F16H61/04B60W10/113B60W30/18
CPCB60W10/113B60W30/18063B60W2510/0652F16H61/04F16H2061/0492
Inventor 马岩蔡文文熊杰曹龙张广辉
Owner CHINA FIRST AUTOMOBILE
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