Hydraulic control system using a torque allotment ratio to deter

Details Hydraulic control system using a torque allotment ratio to deter Hydraulic control system using a torque allotment ratio to deter

1997-04-25

1999-06-01

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 477156, F16H 540

Patent

active

059083700

ABSTRACT:
In power-on, high-vehicle-speed and high-torque conditions, a control unit sets a torque allotment ratio such that a main clutch bears all the torque. Thereby, the input shaft rotational speed is increased by controlling solely the main clutch releasing pressure. In power-on and low-torque or low-vehicle-speed conditions, the control unit sets a torque allotment ratio for the main clutch torque and the sub-clutch torque to 1:1. Thereby, control of the main clutch releasing pressure and control of the sub-clutch engaging pressure simultaneously proceed in parallel to produce a change in the input shaft rotational speed without a time lag. The hydraulic control apparatus thus conducts proper downshift control for a shift involving clutch engagement changeover, under all vehicle running conditions, without need for additional control logic.

REFERENCES:
patent: 5368531 (1994-11-01), Ando et al.
patent: 5872711 (1998-07-01), Tsutsui et al.

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