Hydraulic system for an automatic gearbox of a motor vehicle

A technology for automatic transmissions, hydraulic systems, applied in the direction of fluid pressure actuation system testing, mechanical equipment, elements with teeth

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

In the event of a functional failure of the clutch valve, there is the risk that the clutch valve can no longer be brought into its closed position, so that there is permanently high hydraulic pressure at the clutch cylinder

Method used

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

Examples

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Embodiment Construction

[0028] exist figure 1 A schematic diagram of a dual clutch transmission for a motor vehicle with all-wheel drive is shown in FIG. The dual clutch transmission has seven forward gears (see boxed numbers 1 to 7) and one reverse gear RW. The dual clutch transmission is described below only to the extent necessary to understand the invention. The dual-clutch transmission therefore has two input shafts 12 , 14 which are arranged coaxially with one another and which can be alternately connected to a power source, for example an internal combustion engine, via two hydraulically actuatable multi-plate clutches K1 , K2 . The input shaft 14 is embodied as a hollow shaft, in which the input shaft 12 , which is embodied as a solid shaft, extends. The two input shafts 12 , 14 are driven via gear sets for forward and reverse gears to an output shaft 16 arranged axially parallel and to an intermediate shaft 18 designed as a hollow shaft. The gearsets of the forward gears 1 to 7 each have ...

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PUM

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Abstract

The invention relates to a hydraulic system for an automatic gearbox of a motor vehicle, comprising a high-pressure circuit (H) containing a pressure accumulator (25), at least one clutch (K1, K2), agear selector (G1 to G4) and a hydraulic pump (53) that can be controlled by an electronic control unit (39), by means of which, in a charging mode, the accumulator pressure (ps) in the high-pressurecircuit (H) can be increased, wherein a coupling valve (35) that can be controlled by the control unit (39) is arranged in a coupling path (30, 31) between the pressure accumulator (25) and a clutch hydraulic cylinder (23) of the clutch (K1, K2), said valve adjusting a hydraulic pressure applied to the clutch hydraulic cylinder (23), and wherein a safety valve (28) that can be controlled by the control unit (39) is arranged upstream from the coupling valve (35), said safety valve depressurising the coupling path (30, 31) by interrupting the flow from the pressure accumulator (25), in a closedposition, and pressurising the coupling path (30, 31) with the accumulator pressure (ps) in a flow position. According to the invention, the control unit (39) has a diagnosis module (79) that can be used to carry out a safety valve diagnosis, during which the safety valve (28) is checked.

Description

technical field [0001] The invention relates to a hydraulic system for an automatic transmission, in particular a dual clutch transmission, of a motor vehicle according to claim 1 and to a method for diagnosing components in such a hydraulic system according to claim 7 . Background technique [0002] In the case of a dual-clutch transmission, fully automatic gear changes are realized without interruption of traction force by means of two sub-transmissions. The torque is transmitted via one of the two clutches, which connects the two subtransmissions to the drive. The clutches and the gear selectors for engaging gears are actuated by hydraulic cylinders, which can be hydraulically actuated by a hydraulic system. [0003] Document DE 10 2014003 083 A1 discloses a hydraulic system of this type which has a pressure accumulator for providing an accumulated pressure in the hydraulic system. A control valve actuatable by the electronic control unit is arranged in the clutch line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/12F16H61/688
CPCF16H61/12F16H61/688F16H2059/683F16H2061/1212F16H2061/1264F15B1/04F15B15/20F15B19/005F15B2201/51
Inventor M·威恩哈特
Owner AUDI AG
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