Control system of vehicle driving system

Details Control system of vehicle driving system Control system of vehicle driving system

1998-02-26

1999-08-31

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Plural engines

Electric engine

74335, 74336R, B60K 4102

Patent

active

059446307

ABSTRACT:
In a vehicle driving unit employing a driving source formed by combining an engine with a motor generator, a control system prevents a sharp decline of an output torque of a transmission at the end of a shift operation without extending a time period required for the shift operation. The shift shock resulting from the sharp decline of the output torque can be eliminated. The vehicle driving unit is provided with an engine, a motor generator and a multi-stage automatic transmission for accomplishing a predetermined speed by engagement of friction engagement elements. The control system includes a shift operation termination determination step for determining the length of time remaining until the termination of a shift operation being performed by engagement of the friction engagement elements and a torque output command step for generating a torque assistance command to the motor generator based on the determination made during the shift operation termination determination step such that the transmission output torque decreases gently from a predetermined torque value. An assistance torque is outputted to prevent the sharp decline of the transmission output torque at the end of the shift operation caused by the inertia torque being rapidly absorbed by the friction engagement elements.

REFERENCES:
patent: 5713814 (1998-02-01), Hara et al.
patent: 5720690 (1998-02-01), Hara et al.
patent: 5735770 (1998-04-01), Omote et al.
patent: 5771478 (1998-06-01), Tsukamoto et al.
patent: 5813943 (1998-09-01), Kousaka et al.
patent: 5846155 (1998-12-01), Taniguchi et al.

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