Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Clutch control
Patent
1996-11-27
2000-08-08
Dombroske, George
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Clutch control
731181, B60K 17344, F16H 6106
Patent
active
061014400
ABSTRACT:
A control device for an automatic motor vehicle transmission has electrohydraulically actuated gearshift elements which increase the smoothness of shifting during a shifting operation, especially a shifting operation in a traction mode, by varying hydraulic pressure for actuating the gearshift elements. In a first phase of the shifting operation, in which idle travels of the gearshift elements are overcome, the pressure is rapidly made to approach a desired value through the use of a control signal (open-loop control) with a high duty cycle. In a second phase of the shifting operation, in which a transmission input moment changes from the gearshift element of an old gear over to the gearshift element of a new gear, the hydraulic pressure is built up with a high duty cycle. In a third phase of the shifting operation, in which a decrease in engine rpm required to carry out the gear change takes place, through a change in the duty cycle, the hydraulic pressure is first rapidly brought by open-loop control to a desired variable and thereafter is closed-loop controlled.
REFERENCES:
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5251132 (1993-10-01), Bulgrien
patent: 5450768 (1995-09-01), Bulgrien et al.
patent: 5771477 (1998-06-01), Showalter et al.
Graf Friedrich
Ulm Michael
Wagner Thomas
Dombroske George
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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