Control system for controlling transmission fluid pressure

Details Control system for controlling transmission fluid pressure Control system for controlling transmission fluid pressure

1987-03-09

1988-10-25

Wright, Dirk

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

192 82T, 25112908, B60K 4118

Patent

active

047794895

ABSTRACT:
When a pulse width modulated electrical signal is employed to operate an electro-mechanical device, such as a solenoid valve, in a transmission to produce a controlled fluid pressure whose level is proportional to the signal's duty cycle, proper operation at cold temperatures is ensured by varying the frequency of the pulse width modulated signal directly with the temperature of the transmission fluid. By decreasing the operating frequency when the transmission fluid is cold (at which time the fluid may thicken and become heavy since its viscosity will increase), the solenoid valve will be actuated slowly enough to effect flow control through the valve and adequate regulation of the fluid pressure.

REFERENCES:
patent: 3834617 (1974-09-01), Dyntar
patent: 4199048 (1980-04-01), Ishikawa
patent: 4373697 (1983-02-01), Phelps
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4538644 (1985-09-01), Kuntson et al.
patent: 4678069 (1987-07-01), Yoshimura et al.

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