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Method and control device for operating drivetrain

A technology for driving transmission and control devices, which is applied to transmission devices, transmission device control, gear transmission devices, etc., and can solve problems affecting the consumption of motor vehicles

Active Publication Date: 2019-10-29
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, friction torques or drag torques are generated during slipping operation, which adversely affect the consumption of the motor vehicle

Method used

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  • Method and control device for operating drivetrain
  • Method and control device for operating drivetrain
  • Method and control device for operating drivetrain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The invention relates to a method for operating a drive train of a motor vehicle including an automatic or automated transmission and to a control device for carrying out the method.

[0023] figure 1 A schematic diagram of a drive train of a motor vehicle is shown, in which the method according to the invention is preferably used. therefore, figure 1 The drive train consists of two drive units 1 , 2 , a transmission 3 and an output 4 . The transmission 3 preferably includes a planetary gear set 5 .

[0024] The two drive units 1 , 2 act on different drive shafts or transmission shafts of the transmission 3 , ie the first drive unit 1 acts on the first drive shaft 6 and the second drive unit 2 acts on the further second drive shaft 7 . The drive units 1 and 2 are not in a constant but variable transmission ratio relative to each other. The two drive shafts 6 , 7 are distinct from the transmission output shaft 8 .

[0025] In the illustrated embodiment, the first d...

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PUM

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Abstract

The invention relates to a method for operating a drivetrain. In order to shift gears, a setpoint torque of drive units is determined at least as a function of an output torque desired by a driver. When a switching element is opened for gear shifting, by controlling the drive units as a function of the calculated setpoint torque, the switching element becomes unloaded in such a way that the setpoint torque on one drive unit is reduced and the setpoint torque on the other drive unit is increased in order to open the switching element in an unloaded manner while providing an output torque desired by the driver at the output. The switching element has been controlled in the opening direction by a defined control pressure before theoretically changing to no load as a function of the setpoint torque, whether the switching element to be opened starts to move or not is monitored, and the actual torque of the drive unit when the switching element to be opened starts to move is determined as the actual torque when the switching element to be opened actually becomes unloaded.

Description

technical field [0001] The invention relates to a method and a control device for operating a drive train of a motor vehicle. Background technique [0002] Such motor vehicle drive trains are known from hybrid vehicles, which comprise a plurality of drive units, a transmission and an output. It is known here that a first drive unit acts on a first drive shaft, a second drive unit acts on a further second drive shaft, and that the transmission output shaft differs from the first drive shaft on which the first drive unit acts and that the second drive unit acts the second drive shaft. The first drive unit is preferably an internal combustion engine and the second drive unit is preferably an electric machine operable as an electric motor and as a generator. A transmission of such a drive train comprises a plurality of shift elements, a first number of shift elements being closed and a second number of shift elements being open in each engaged gear of the transmission. In ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/04F16H61/686F16H61/682F16H63/50F16H59/44F16H59/14B60W20/30
CPCF16H61/04F16H61/686F16H61/682F16H63/50F16H59/44F16H59/14B60W20/30F16H2061/0078B60K6/365B60K6/387B60K6/48B60W2710/1005B60W2710/10B60W2710/0666B60W2710/083B60W30/19B60W10/11B60W10/06B60W10/08F16H2306/44F16H61/0403F16H2061/0422Y02T10/62B60W20/40B60W10/02F16H3/724B60K2006/4825F16H3/006
Inventor A·魏登巴赫J·卡斯滕斯M·阿兹纳
Owner ZF FRIEDRICHSHAFEN AG