Inventors:
Allan S. Leonard - Westland MI
Kenneth G. Walega - Allen Park MI
David M. Garrett - Rochester Hills MI
Thomas L. Greene - Plymouth MI
John A. Daubenmier - Canton MI
Bruce J. Palansky - Livonia MI
Lawrence H. Buch - Farmington Hills MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
F16H 6100
Abstract:
An electrically controlled multiple ratio transmission for an automotive vehicle powertrain having a hydrokinetic torque converter with a bypass clutch, solenoid operated shift valves under the control of an electronic microprocessor that receives signals from an output shaft speed sensor, an engine speed sensor, a driver controlled drive range selector position, an engine throttle position sensor, and other powertrain operating variables, the solenoid shift valves forming a part of a simplified control valve circuit having a minimum number of shift valve elements and simplified circuit pressure modifier elements for effecting optimum pressures in fluid pressure operated servos for the transmission clutches and brakes during ratio changes, the bypass clutch having a controlled slip characteristic.