Transmission having electromagnetic proportional reduction valve

Details Transmission having electromagnetic proportional reduction valve Transmission having electromagnetic proportional reduction valve

1988-09-22

1990-08-14

Lall, Parshotam S.

Boots, shoes, and leggings

192109F, 74867, B06K 4128, F16D 4328

Patent

active

049492640

ABSTRACT:
A hydraulic control apparatus for a transmission comprising a hydraulic change speed clutch, an oil line connecting the change speed clutch to an oil pump, an electromagnetic proportional reduction valve mounted on the oil line for varying oil pressure output to the change speed clutch in response to control current applied to the reduction valve, a microcomputer for producing the control current and applying the same to the reduction valve, and a command unit for transmitting a command to the microcomputer to engage the change speed clutch. The control current produced by the microcomputer includes a first component current continuing at a first current level for a first predetermined period, a second component current following the first component current and continuing at a second current level lower than the first current level for a second predetermined period, and a third component current following the second component current, starting at a third current level not exceeding the second current level and continuing at a current level which rises with progress of time.

REFERENCES:
patent: 4465168 (1984-08-01), Sato
patent: 4711329 (1987-12-01), Hasegawa et al.
patent: 4718525 (1988-01-01), Yamaguchi
patent: 4800497 (1989-01-01), Koori et al.

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