Robert Boschgmbh

Klemens Kronenberg

Marko Poljansek

Chi-Thuan Cao

Wolfgang Bullmer

Herbert Ott

The invention proceeds from a system for determining the changes in gear ratio for an automatic transmission of a vehicle. In the system, at least two different pregiven associations (shift programs) are selected in dependence upon the detected vehicle speed and the detected accelerator pedal position. The selection of these associations (shift program) takes place with the aid of a specific adaptation quantity. The essence of the invention is in the determination of this adaptation quantity and therefore in the selection of the different shift programs. According to the invention, the selection of the associations or shift programs takes place in such a manner that one of the two associations is set as the base adjustment, that is, as the base shift program. The other association, or in the case of several alternative associations, the other associations are set for only a specific time duration. After this time duration has elapsed, the system of the invention automatically returns to the base setting.

System for determining the gear ratio changes for an automatic

The invention is directed to a system for determining the gear ratio changes in an automatic transmission in a vehicle having an accelerator pedal actuated by a driver of the vehicle. The system includes a first sensor for detecting the position (DK) of said accelerator pedal as a first variable and a second sensor for detecting at least one of the following as a second variable: the vehicle straight-line speed (V.sub.x), transmission output rpm and the motor rpm. An adaptation variable (BZ) is determined in an evaluation mode in dependence upon a comparison of a time-dependent change of the first variable to at least one threshold value (SW, SW1, SW2). A characteristic field receives the first and second variables as input variables. The characteristic field and the adaptation variable (BZ) are used to form a gear ratio change (SG) for the automatic transmission.

Adaptive transmission control

The invention is directed to a method for adjusting the hydraulic pressure actuating at least one clutch of an automatic transmission. The hydraulic pressure is pregiven only by one pressure controller and the automatic transmission coacts with the motor which is especially a drive motor of a motor vehicle. The pressure supplied by the pressure controller is determined in dependence upon the trace of a pregiven motor desired torque.

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Oberriexingen, Germany

Klemens Kronenberg