Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1993-10-06
1995-11-28
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
3644241, 477174, 477902, B60K 4106, F16H 5914
Patent
active
054702887
ABSTRACT:
A system and method for controlling gear ratio changes in an automatic transmission includes an electronic microprocessor, an electronic memory accessible to the microprocessor, solenoid-operated shift valves, pressure actuated friction clutches and brakes, a variable force solenoid-operated valve, a torque converter bypass friction clutch, and control algorithms that produce output signals to control the state of the solenoid-operated valves. The vehicle speed and engine speed at which upshifts and downshifts occur, according to a standard gear shift schedule, is compensated for loss of engine torque at conditions that differ from the conditions at which a reference shift schedule is defined. Vehicle speed is compensated for torque variation with reference to the ratio of current calculated engine torque divided by current engine output torque.
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U.S. application Ser. No. 8,139,690, filed Oct. 22, 1993, "Automatic Transmission Torque Converter Bypass Clutch Control Using Engine Torque Compensation".
Greene Thomas L.
Palansky Bruce J.
Schock Eileen A.
Ford Motor Company
May Roger L.
McKenzie Frank C.
Ta Khoi Q.
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