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Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox

A technology of power shifting and control method, which is applied in the control of the shifting process of power shifting transmission and the field of power shifting transmission, and can solve the problems of torque shock, acceleration change, etc.

Inactive Publication Date: 2010-04-28
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So-called crossshifts are described above, but in which imprecise overlapping transitions can lead to torque shocks, which can finally appear as changes in acceleration when changing gears

Method used

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  • Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox
  • Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox
  • Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox

Examples

Experimental program
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Embodiment Construction

[0030] in the attached picture figure 1 A graph schematically showing the change of engine torque and clutch torque with respect to time during the shifting process. In this diagram, the engine torque 1 remains constant during the gearshift. Also in this overview, the clutch torque 2 of the friction clutch assigned to the outgoing old gear remains constant and has an excess relative to the engine torque. In this schematic diagram, the clutch torque 3 of the new friction clutch 3 assigned to the new gear rises extremely linearly during the torque take-up and then approaches the torque 1 .

[0031] at stage t 1 In the process, the predetermined preload force is applied to the shift clutch of the old gear to be set out through the transmission actuator, so that at the moment of torque balance on the new friction clutch, the transmission actuator can easily and quickly Turn on the preloaded shift gears. With this approach it is possible to approach the ideal state which is rea...

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PUM

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Abstract

The invention relates to a method for controlling gear-shifting processes of a powershift gearbox which can be coupled to a drive motor and has gear steps comprising two friction clutches and a plurality of clutches, and at least one gearbox actuator for actuating the gear steps. Said method comprises the following steps: the torque of the drive motor is received by the new friction clutch associated with the new gear step to be engaged; before the disengagement of the old gear step and before or during the torque reception, a pre-determined pre-tensioning force is applied to the clutch of theold gear step by means of the gearbox actuator; and the old gear step is disengaged when the motor torque and the clutch torque are balanced.

Description

technical field [0001] The invention relates to a method for controlling the shifting process of a power shift transmission coupled with a driving engine, the power shift transmission has two friction clutches and a plurality of transmission gears provided with shift clutches and at least one for The transmission actuator that operates the transmission gears. Furthermore, the invention relates to a powershift transmission operating according to the method. Background technique [0002] In addition to the known manual transmissions, for example for passenger cars, in which the shifting or shifting process is carried out by operating the shift lever by the driver of the vehicle, and automatic transmissions in the form of planetary transmissions, there is also known a An example is a powershift transmission in the form of a hitless shift transmission. This powershift transmission has a starting element in the form of a friction clutch and a second friction clutch, by means of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/00F16H3/08B60W10/02B60W10/10B60W30/00B60W30/18F16H61/04F16H61/688F16H63/50
CPCB60W2510/1015F16H61/0437F16H2306/46B60W10/02F16H2306/42B60W2510/0275F16H2312/02F16H63/46B60W10/113B60K2741/225B60W2710/0666F16H63/502B60W2510/0638B60W30/19F16H2306/52F16H61/688B60K2741/286B60W2510/0657B60W10/06B60W10/10B60W30/1819Y10T74/19274B60W30/18027B60W10/11
Inventor 赖因哈德·贝格尔冈特·希尔特亚历山大·施魏策尔鲍里斯·谢列布连尼科夫利德瓦尔·布达勒布拉德·谢勒哈默杰里米·惠特默迪特马尔·朗
Owner SCHAEFFLER TECH AG & CO KG
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