Hydraulic control system for automatic transmission

Details Hydraulic control system for automatic transmission Hydraulic control system for automatic transmission

1986-10-03

1988-08-16

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4102

Patent

active

047635452

ABSTRACT:
A hydraulic control system comprises a control valve with a solenoid valve operatively connected thereto to modulate the characteristic of hydraulic fluid pressure supplied to a friction element that is to be engaged during a shift in speed ratio. The current supplied to the solenoid is varied in ON/OFF manner in accordance with a duty factor computed by a control unit. The control unit includes a memory storing a map containing various duty factors corresponding to various kinds of shifts and determines an adequate duty factor for a shift which is to take place in the transmission. The characteristic of the hydraulic fluid pressure is modulated during a time period variable with vehicle speed and engine torque which are measured by sensors associated with the control unit.

REFERENCES:
patent: 3750495 (1973-08-01), Ito et al.
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4485695 (1984-12-01), Kawamoto
patent: 4538482 (1985-09-01), Hiramatsu
patent: 4561328 (1985-12-01), Hiramatsu
patent: 4611285 (1986-09-01), Weisman, II
"Hydraulic Control System for Automatic Transmission", Service Manual of Jan. 1986, published by Nissan Motor Co., Ltd.

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