Adaptive shift pressure characterization of an electronically co

Details Adaptive shift pressure characterization of an electronically co Adaptive shift pressure characterization of an electronically co

1991-06-27

1992-02-11

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 74844, 74845, B60K 4106

Patent

active

050866656

ABSTRACT:
An adaptive pressure control for an automotive transmission in which the fluid pressure developed by an electro-hydraulic actuator is directed to a plurality of fluid operated torque establishing devices, wherein adaptive pressure corrections occasioned by actuator variability do not impair shift quality in operating regions known to be substantially free of actuator variability. Separate adaptive correction amounts are provided for each torque establishing device, and the amounts are compared to determine the portion, if any, occasioned by actuator variability. Such portion is utilized as a correction to an open-loop scheduled pressure to a degree which depends on the magnitude of the scheduled pressure.

REFERENCES:
patent: 4283970 (1981-08-01), Vukovich
patent: 4318311 (1982-03-01), Ross
patent: 4319501 (1982-03-01), Sugimoto
patent: 4419909 (1983-12-01), Opperud et al.
patent: 4653350 (1987-03-01), Downs et al.
patent: 4853673 (1989-08-01), Kido et al.
patent: 5022285 (1991-06-01), Suzuki
patent: 5031480 (1991-07-01), Kuwayama et al.
patent: 5036729 (1991-08-01), Nitz et al.

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