Control system for controlling transmission fluid pressure

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

F - Mech Eng,Light,Heat,Weapons

16

H

342/38

F16H 59/72 (2006.01) F16H 61/02 (2006.01) F16K 31/02 (2006.01)

Patent

CA 1263891

CONTROL SYSTEM FOR CONTROLLING TRANSMISSION FLUID PRESSURE ABSTRACT When a pulse width modulated electrical signal (on 12) is employed to operate an electro-mechanical device (16), such as a solenoid valve, in a transmission to produce a controlled fluid pressure (in 19) 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 (Fig. 2) 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.

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