Hydraulic control for a transmission

Details Hydraulic control for a transmission Hydraulic control for a transmission

1979-08-06

1981-02-24

Husar, C. J.

Fluid handling

Systems

Supply and exhaust

74866, 74868, 74869, 74DIG1, E03B 000, B60K 4118

Patent

active

042521483

ABSTRACT:
A hydraulic control for an automatic transmission has a plurality of shift control valves for controlling the interchange of drive ratios within the transmission. The shift control valves each have a control chamber subjected to substantially constant pressure and a shift control chamber having an area proportional to the respective control chamber which is subjected to a variable control pressure. The variable control pressure is controlled at discrete levels by a single pulse width modulator (PWM) solenoid. The respective area ratios of the shift control chambers to the controlled chambers determines the distinct shift point of each shift valve.

REFERENCES:
patent: 3041892 (1962-07-01), Schjolin
patent: 3052262 (1962-09-01), McCann
patent: 3760843 (1973-09-01), Larner
patent: 3943973 (1976-03-01), Zettergren
patent: 4031782 (1977-06-01), Miller et al.
patent: 4116321 (1978-09-01), Miller

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