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Method for controlling an automatic clutch

A separation clutch and automatic separation technology, applied in the direction of clutches, mechanical equipment, etc., can solve the problem of overloading of the separation clutch.

Inactive Publication Date: 2010-06-16
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In frequent starting situations, especially on steep road gradients and high loads, the release clutch is therefore also overloaded

Method used

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  • Method for controlling an automatic clutch
  • Method for controlling an automatic clutch
  • Method for controlling an automatic clutch

Examples

Experimental program
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Effect test

Embodiment Construction

[0031] according to figure 2 A drive train 1 having an engine 2 designed as an internal combustion engine, in which the method according to the invention can be used, is connected via a torque converter 3 to an at least partially automatically shiftable multi-stage transmission 4 . The drive shaft 5 (crankshaft) of the engine 2 is connected in a rotationally fixed manner to the pump shaft 6 of the torque converter 3 . The turbine shaft 7 of the torque converter 3 can optionally be connected to the pump shaft 6 via a tap clutch 8 . In the power flow between the torque converter 3 and the multi-stage transmission 4 there is arranged a separating clutch 9 , which is now designed as an automatic multi-disk clutch, the friction plate carrier at the input of which is connected in a rotationally fixed manner to the turbine shaft 7 of the torque converter 3 , Furthermore, the friction lining carrier at its output is connected in a rotationally fixed manner to the input shaft 10 of t...

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PUM

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Abstract

The invention relates to a method for controlling an automatic clutch (9) which is designed as a friction clutch and is disposed in the drive train of a motor vehicle, between the turbine shaft (7) of a hydrodynamic torque converter (3) and the input shaft (10) of a multi-speed transmission (4) encompassing positive shifting elements. Said clutch (9) is released when the speed drops below a minimum speed (vF < vmin), the gas pedal is not actuated (xFP= 0), and the brake pedal is actuated (xBP > 0, pBr > 0), while being engaged when the starting gear is engaged and the minimum speed is exceeded (vF > vmin), the gas pedal is actuated (xFP > 0), or the brake pedal is not actuated (xBP = 0, pBr = 0). In order to reduce the transmitted creeping moment, at least one service parameter that increases prior to or at the beginning of a stopping process is repeatedly detected and is compared with a predefined upper limit, the exceeding of which can be interpreted as an imminent stop of the motor vehicle, and in case the gas pedal is not actuated (xFP = 0) and the brake pedal is actuated (xBP > 0, pBr > 0), the clutch (9) is already released before the speed drops below the minimum speed (vmin) when the service parameter exceeds the upper limit.

Description

technical field [0001] The invention relates to a method for automatically disengaging a clutch which is designed as a friction clutch and which is arranged in the drive train of a motor vehicle between a turbine shaft of a hydrodynamic torque converter and a multi-stage transmission with form-fitting shifting elements. between the input shafts, and the disconnecting clutch is disengaged below the minimum speed without actuating the accelerator pedal and actuating the brake pedal, and with the engaged starting gear at over the minimum speed or actuating the accelerator pedal or without actuating the access without moving the pedal. Background technique [0002] Especially in heavy commercial vehicles and special vehicles (such as fire trucks and lift trucks), manual or automatic multi-stage transmissions are used with form-fitting shifting elements (such as synchronous or asynchronous jaw clutches), They are each connected at the input end to the engine through a torque con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D48/06
CPCF16D2500/70424F16D2500/31426F16D2500/3144F16D2500/3111F16D2500/50206F16D48/06F16D2500/1045F16D2500/1112F16D2500/3101F16D2500/10412F16D2500/50296
Inventor 克劳斯·亨辛格尔安杰尔科·韦森亚克
Owner ZF FRIEDRICHSHAFEN AG