Automatic transmission control system
August 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAutomatic power transmission shift valve Hydraulic control system for servos in automatic transmissions Multiple ratio overdrive transmission Lock-up control system for lock-up type automatic transmission Downshift timing and engine brake control for automatic transmission Control system for a four-speed automatic transmission Automatic transmission system for a vehicle Automatic transmission control apparatus Control system for a direct-coupling mechanism in hydraulic power transmission means of a transmission for automotive vehicles System for controlling a line pressure in an automatic transmission for motor vehicles Inventors
AssigneeApplicationNo. 926627 filed on 08/10/1992US Classes:475/123, Electrical control475/128, Valving controls shift timing477/155Electric valve controlExaminersPrimary: Wright, DirkAttorney, Agent or FirmInternational ClassF16H 061/00AbstractAn 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. | |
