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Hydraulic systems for automatic transmissions of motor vehicles

An automatic transmission, hydraulic system technology, used in fluid pressure actuation system testing, couplings, clutches, etc.

Active Publication Date: 2021-02-09
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a risk that the accumulator boost valve will no longer transition between boosted and non-boosted states at credible lower / upper pressure thresholds

Method used

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  • Hydraulic systems for automatic transmissions of motor vehicles
  • Hydraulic systems for automatic transmissions of motor vehicles
  • Hydraulic systems for automatic transmissions of motor vehicles

Examples

Experimental program
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Embodiment Construction

[0057]infigure 1 The schematic diagram shows a dual clutch transmission for an all-wheel drive motor vehicle. The dual clutch transmission has seven forward gears (see the framed numbers 1 to 7) and a reverse gear RW. Hereinafter, the dual clutch transmission is explained only to the extent necessary to understand the present invention. Therefore, the dual clutch transmission has two input shafts 12, 14, which are arranged coaxially with each other and can be alternately connected to a power source, such as an internal combustion engine, via two hydraulically actuable multi-plate clutches K1, K2. The input shaft 14 is implemented as a hollow shaft in which the input shaft 12 configured as a solid shaft extends. The two input shafts 12, 14 are driven by gear sets of the forward gear and the reverse gear to the output shaft 16 arranged axially parallel and the intermediate shaft 18 configured as a hollow shaft. The gear sets of forward gears 1 to 7 respectively have fixed gears and fl...

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PUM

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Abstract

The invention relates to a hydraulic system for an automatic transmission of a motor vehicle, in particular a dual-clutch transmission. The hydraulic pump is fluidly connected to the high-pressure circuit, and when the accumulator pressure in the high-pressure circuit exceeds the upper pressure threshold, the accumulator boost valve automatically moves from the pressurized state to the non-pressurized state at the first switching moment state, the accumulator boost valve automatically moves from the non-boosted state to the boosted state at a second transition moment when the accumulator pressure is lower than the downforce threshold. According to the invention, the control unit has a diagnostic module, with which a switching time diagnosis is carried out, in which it is determined whether the actual stored pressure is within the range of the upper pressure threshold at the first switching time, wherein the fault can be The situation is stored in the fault memory at the time of switching.

Description

Technical field[0001]The invention relates to a hydraulic system for an automatic transmission of a motor vehicle, especially a dual-clutch transmission, and a method for diagnosing components in such a hydraulic system.Background technique[0002]In a dual-clutch transmission, two sub-transmissions are used to achieve fully automatic gear changes without interruption of traction. The transmission of torque is achieved through one of the two clutches, which connects the two sub-transmissions with the drive. The clutch and the gear adjuster for shifting gears are operated by hydraulic cylinders, which can be operated hydraulically by the hydraulic system.[0003]The document DE 10 2014 003 083 A1 discloses this type of hydraulic system, which has a pressure accumulator for providing a stored pressure in the hydraulic system. A control valve that can be controlled by an electronic control unit is arranged in the clutch circuit leading from the accumulator to the clutch hydraulic cylinder,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B19/00F16H61/12F16H61/688
CPCF16H61/12F16H61/688F16H2061/0034F16H2061/1208F15B1/04F15B13/0444F15B19/005F15B2201/51F16D2300/0214F16H61/0021F16H2059/683F16H2061/1212F16H2061/1264
Inventor M·威恩哈特
Owner AUDI AG