Control system for a single servo during multiple speed changes

Details Control system for a single servo during multiple speed changes Control system for a single servo during multiple speed changes

1997-04-04

1999-08-24

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 477154, 477156, F16H 6104

Patent

active

059417951

ABSTRACT:
The present invention prevents shift shock and reduces time required to execute the complete speed change operation in the case where a second speed change is commanded while a first speed change operation is still in progress. If a down-shift to a first speed stage is commanded during an up-shift operation from the first to the second speed, the hydraulic pressure in the second speed change operation is controlled in accordance with the state of the first speed change operation at the time of generation of the command for the second speed change. For example, if a down-shift to the first speed stage is commanded during the torque phase of an up-shift operation from first to second speeds, namely, before change in the rotational speed of the input shaft has started, only completion control of the down-shift operation is executed. On the other hand, if the down-shift to the first speed stage is commanded during the inertia phase of the up-shift operation, namely, after the speed change has been started, hydraulic control of the down-shift is started with the initial speed change control.

REFERENCES:
patent: 4955257 (1990-09-01), Terayama et al.
patent: 5527236 (1996-06-01), Kimura et al.
patent: 5702322 (1997-12-01), Sunada et al.

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