192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1990-12-24
1992-06-16
Braun, Leslie A.
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
192 329, 192 0076, 192103F, 3644241, F16D 3300
Patent
active
051218208
ABSTRACT:
A powertrain including an engine controlled by the position of a throttle valve, a hydrodynamic torque converter having a bypass clutch, multiple ratio automatic transmission connected to the drive wheels of the vehicle, a solenoid-operated hydraulic valve that supplies pressurized fluid to engage and release the bypass clutch, is controlled by operation of a feedforward control system. An engine math model produces a signal representing the net torque output by the engine, which signal is applied as input to an inverse mathematical model of the solenoid-operated valve that supplies hydraulic fluid to the bypass clutch. The unique relationship of phase to gain, the frequency response of the solenoid valve, is inverted to remove the effects of delay and transient rise time. Torque converter slip error determined as the difference between torque converter impeller speed and turbine speed, 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 of the bypass pressure hydraulic valve.
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Brown Larry T.
Chen Lee-Fei
Hrovat Davorin D.
Braun Leslie A.
Ford Motor Company
McKenzie Frank G.
Pitts Andrea
Zerschling Keith L.
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