05123302 is referenced by 37 patents and cites 13 patents.

In a powertrain including an engine controlled by the position of the throttle valve, a hydrodynamic torque converter and multiple ratio automatic transmission connected to the drive wheels of the vehicle, a solenoid-operated hydraulic valve supplies pressurized fluid to engage and release the clutch that controls torque transfer between an offgoing clutch and an oncoming clutch. The position of the throttle valve and the speed of the engine are applied as input to a mathematical model programmed in algorithmic form for execution by a digital microprocessor. The engine produces a signal representing net torque output by the engine and torque converter, which signal is applied as input to an inverse mathematical model of the solenoid-operated valve that supplies hydraulic fluid to the controlling clutch. The unique relationship of phase to gain, the frequency response of the solenoid valve, is inverted within the frequency range of interest to remove the effects of delay. Torque converter turbine speed error is determined as it is applied as input to a PID compensated feedback control, whose output is summed with the inverse of the solenoid valve frequency response to produce a duty cycle supplied to the solenoid that controls pressure in the transmission friction element.

Title
Automatic transmission gearshift control having feedforward response of clutch and its hydraulic actuation
Application Number
7/632712
Publication Number
5123302
Application Date
December 24, 1990
Publication Date
June 23, 1992
Inventor
Davorin D Hrovat
Dearborn
MI, US
Lee Fei Chen
Dearborn
MI, US
Larry T Brown
Dearborn
MI, US
Agent
Roger L May
Frank G McKenzie
Assignee
Ford Motor Company
MI, US
IPC
B60K 41/04
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