Forced engagement logic

Details Forced engagement logic Forced engagement logic

1993-09-22

1995-07-04

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

477 81, 477125, 74336R, F16H 546

Patent

active

054295599

ABSTRACT:
A control system/method (104) for controlling execution of selected shifts of a mechanical transmission system (10) is provided. The control system includes a central processing unit (106) for receiving input signals indicative of engine or input shaft (11/98) speeds and of output shaft or vehicle speed (VS) speeds and from a driver control console (108) indicative of manual or automatic selection of upshifts or downshifts from a currently engaged gear ratio and processing the same in accordance with predetermined logic rule to issue command output signals to a transmission actuator (112, 70, 96) to implement the selected shifts upon a manually or automatically caused torque break of the transmission and manually or automatically caused substantial synchronization of the transmission thereafter. The predetermined logic rules include a strategy for sensing conditions indicative of a potentially dangerous downhill free-wheeling situation and for immediately causing the forced engagement of a gear ratio (GR.sub.FE) determined as a function of vehicle speed regardless of the presence or absence of substantially synchronous conditions.

REFERENCES:
patent: 5261288 (1993-11-01), Menig
patent: 5261298 (1993-11-01), Markyvech
patent: 5335566 (1994-08-01), Genise et al.

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