Hydraulic control system for automatic transmission
The present invention relates to a hydraulic control system for an automatic transmission of a vehicle. A hydraulic control system for an automatic transmission, in which four forward speeds and one reverse speed are realized by the use of a reduced number of friction elements compared to the prior...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
08.06.2004
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| Online Access | Get full text |
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| Summary: | The present invention relates to a hydraulic control system for an automatic transmission of a vehicle.
A hydraulic control system for an automatic transmission, in which four forward speeds and one reverse speed are realized by the use of a reduced number of friction elements compared to the prior art such that overall structure is simplified, the weight of the automatic transmission is decreased, and the cost of production is reduced. In the hydraulic control system, hydraulic pressure generated in an oil pump is controlled to a predetermined level by a regulator valve, and part of this pressure is supplied as operational pressure of a damper clutch and to a reducing valve, and another part of this pressure is supplied to a hydraulic pressure control section for the selective supply of operational pressure to friction elements that are engaged in each shift range and speed, the hydraulic pressure control section including a shift control assembly, a hydraulic pressure control assembly, a switching assembly, a fail-safe assembly, and a N-R control assembly. |
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