Process for controlling the actuating pressure in a control elem

Details Process for controlling the actuating pressure in a control elem Process for controlling the actuating pressure in a control elem

1992-07-27

1994-08-09

Braun, Leslie A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475123, 477154, 477155, F16H 6108, B60K 4118

Patent

active

053355679

ABSTRACT:
A process is described for controlling the actuating pressure in a control element (shift element) of an electrohydraulically controlled transmission of a motor vehicle during a change of the gear position. In the case of downshifts in the coasting operation, the hydraulic pressure in the transmission is preferably increased with the initiating of the shifting by way of the pressure control valve in a time-limited manner. Starting from a presettable or preset basic value, the amount of this filling pulse is automatically and in steps for each control operation in the course of the operation of the transmission adapted to a target value in such a manner that an input rotational speed of the transmission or a rotational speed of a driving engine connected in front of the transmission follows a predetermined sequence of movements.

REFERENCES:
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patent: 4742461 (1988-05-01), Eschrich et al.
patent: 4781080 (1988-11-01), Iwatsuki
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patent: 4989477 (1991-02-01), Hunter et al.
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patent: 5029087 (1991-07-01), Cowan et al.
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5079970 (1992-01-01), Butts et al.
patent: 5188005 (1993-02-01), Sankpal et al.
Bosch Techn. Berichte (1983) pp. 160-166.
AT2-Automobiltechnische Zeitschrift 85 (1983) pp. 401-405.

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