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Hydraulic system for an automatic transmission of a motor vehicle

A technology of automatic transmission and hydraulic system, which is applied in the direction of mechanical equipment, components with teeth, transmission control, etc., and can solve problems such as functional failure of pressure accumulator and reduction of air pressure

Active Publication Date: 2019-04-02
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Functional failures of the pressure accumulator, for example a drop in air pressure due to a gas leak, can only be detected by expensive sensor systems in the prior art

Method used

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  • Hydraulic system for an automatic transmission of a motor vehicle
  • Hydraulic system for an automatic transmission of a motor vehicle
  • Hydraulic system for an automatic transmission of a motor vehicle

Examples

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Embodiment Construction

[0072] in figure 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 transmitted to the output shaft 16 arranged axially parallel and the intermediate shaft 18 configured as a hollow shaft via the gear sets of the forward gear and the reverse gear. The gear sets of forward gears 1 to 7 respectively have...

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Abstract

The invention relates to a hydraulic system for an automatic transmission, in particular a dual-clutch transmission, of a motor vehicle, comprising the hydraulic cylinder (22, 23) of at least one clutch (K1, K2) and of gear selectors (G1 to G4), which hydraulic system has a pressure accumulator (25) for providing an accumulator pressure (pS) in the hydraulic system, wherein, in at least one clutchpath (30, 31) leading from the pressure accumulator (25) to the clutch hydraulic cylinder (23), a clutch valve (35), which can be controlled by an electronic control unit (39) and by means of which ahydraulic pressure present at the clutch hydraulic cylinder (23) can be set, and a pressure sensor (34), by means of which the hydraulic pressure present at the clutch hydraulic cylinder (23) can besensed, are arranged, and comprising a charging hydraulic pump (53), which, in a charging operation, pumps hydraulic fluid into the hydraulic system in order to increase the actual accumulator pressure (pS). According to the invention, the control unit (39) has a diagnostic module (79), by means of which a preload pressure diagnosis can be performed, in which the diagnostic module (79) checks charging behavior of the pressure accumulator (25) by using the pressure sensor (34) arranged in the clutch path (30, 31).

Description

Technical field [0001] The invention relates to a hydraulic system according to claim 1 for an automatic transmission of a motor vehicle, in particular a dual-clutch transmission, and a method according to claim 10 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 le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/12
CPCF16H61/12F16H2061/0034F16H2061/1208F16H61/0021
Inventor M·威恩哈特
Owner AUDI AG
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