Dennis C Huntington

US Patent:

44873034, Dec 11, 1984

Filed:

Dec 27, 1982

Appl. No.:

6/453302

Inventors:

Elias T. Boueri - Farmington Hills MI
Dennis C. Huntington - Canton MI

Assignee:

Ford Motor Company - Dearborn MI

International Classification:

B60K 4128

US Classification:

192 0052

Abstract:

The start-up clutch of an automatic transmission is pressurized from a source of fluid pressure and vented through operation of a solenoid-operated clutch actuator valve. Operating parameters of the engine and transmission, the size of the throttle angle and setting of the PRNDL gear selector are continuously monitored, read and the valves stored for use in calculating the value of a duty cycle determined in accordance with control equations appropriate to the specific mode in which the driveline is operating. A driver circuit converts the duty cycle to a pulse width modulated waveform, which is used to electronically open and close an electrical circuit of which the solenoid winding is an element.