Adaptive pressure control for an automatic transmission

Details Adaptive pressure control for an automatic transmission Adaptive pressure control for an automatic transmission

1992-04-03

1993-10-12

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74866, 3644241, B60K 4106

Patent

active

052515095

ABSTRACT:
An improved adaptive pressure control which accounts for nonlinearity in the relationship between fluid pressure and shift time. To account for nonlinearity in the relationship between cumulative shift time error and corrective pressure, the control utilizes an empirically derived table of shift time vs. controlled pressure to develop a raw pressure error in lieu of a shift time error. The adaptive pressure correction, in turn, is developed in relation to the cumulative pressure error. This removes the effect of system nonlinearity from the adaptive control, allowing more accurate adaptive convergence than was heretofore achieved.

REFERENCES:
patent: 4283970 (1981-08-01), Vukovich
patent: 4653350 (1987-03-01), Downs et al.
patent: 4845618 (1989-07-01), Narita
patent: 4953090 (1990-08-01), Narita
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5086665 (1992-02-01), Milunas et al.
patent: 5086670 (1992-02-01), Nitz et al.
patent: 5163342 (1992-11-01), Pollack et al.

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