Electrohydraulic control for automatic-shift motor- vehicle...

Details Electrohydraulic control for automatic-shift motor- vehicle... Electrohydraulic control for automatic-shift motor- vehicle...

F - Mech Eng,Light,Heat,Weapons

16

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342/27

F16H 59/00 (2006.01) F16H 61/06 (2006.01) F16H 61/08 (2006.01)

Patent

CA 1277012

ABSTRACT An electrohydraulic control for an automatic-shift motor-vehicle transmission comprises at least two sole- noid-valves which are connected, through control- pressure lines, to shift-valves while these are con- nected to clutch-valves and dampers through system- pressure lines for the purpose of shifting clutches. In order to engage a gear, two clutches are closed and the clutch-valves also have a connection for the supply of a load-dependent modulating pressure. A shift-valve and a clutch-valve are connected, through a control-pressure line, system-pressure lines, and a modulating-pressure line, to a damper in such a manner that one of the clutches has a delayed closing action. This delay produces a smoother shift, es- pecially when shifting under zero load or in the low load range.

546446

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