Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1997-04-08
2000-07-11
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 46, 477 48, 74335, F16H 6100, F16H 6102
Patent
active
060865067
ABSTRACT:
The invention relates to a method for controlling a continuously variable transmission with an electrohydraulic control, a selector device, and a controllable engaging clutch of a motor vehicle, especially one powered by an internal combustion engine, with a control device in a first operating mode automatically selecting and adjusting a gear ratio for the transmission from signals of the selector device and the operating parameters of the motor vehicle such as the throttle angle, driving speed and engine rpm, by means of curves selectable by the driver.
It is proposed, in a second operating mode, to simulate a multi-step transmission influenceable directly by the driver. In order to permit use of this operating mode, only a few preset gear ratios are made available to the driver. In addition, from the operating parameters of the vehicle, but at least from a throttle signal value, as described in DE-OS 39 22 051, a parameter called driving activity SK(t) is obtained which evaluates the driving style of the driver or his behavior as a function of traffic situations relative to the control of the motor vehicle.
The preset gear ratios are combined in groups. Depending on the driving activity SK(t) which has been determined, a group is selected. With higher driving activity SK(t), groups are selected in which the gear ratios are spread more widely and the number of gear ratios is greater. For less driving activity, SK(t) groups are selected whose spread is less and in which the number of gear ratios is smaller.
REFERENCES:
patent: 5624348 (1997-04-01), Lardy et al.
patent: 5628705 (1997-05-01), Kashiwabara
patent: 5688204 (1997-11-01), Runge et al.
Froschke Uwe
Mollers Werner
Petersmann Joseph
Seidel Willi
Stehle Heinz
Dr. Ing. h.c.F. Porsche AG
Ta Khoi Q.
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