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Automatic transmission bypass clutch slip control using nonlinear nverse dynamics
| Details |
Inventors: Hrovat, Davorin D.; Colvin, Daniel S.;
Assignee: Ford Motor Company (Dearborn, MI)
Primary Examiner: Marmor; Charles A.
Assistant Examiner: Kwon; Peter
Attorney, Agent or Firm: McKenzie; Frank G., May; Roger L.
In a powertrain including an engine controlled by engine manifold conditions, 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, supplying 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 predicted 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. |
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DETAILED DESCRIPTION In the operation and control of a powertrain, if torque converter slip is too small, then an abrupt engine throttle position disturbance could cause bypass clutch lockup and associated drivability difficulties.
One way to maintain desired slip is to employ feedback control using an error signal as a measure of slip across the torque converter bypass clutch.
A feedback algorithm for controlling the clutch can employ either classical PID compensation, including lead and lag terms, if required, or a modern compensation technique.
To overcome these difficulties and to improve slip control, in comparison to results produced by current practice, the bypass clutch control system of the present invention adds feedforward control on the basis of throttle angle position and engine speed to feedback control.
Here, it is proposed to use nonlinear actuator system dynamics to further improve the clutch control and associated benefits leading to improved fuel economy, durability, and drivability.
The control of this invention is adaptable for use in a powertrain including an engine controlled by the position of its throttle valve, a hydrodynamic torque converter having a bypass clutch, and a multiple ratio automatic transmission connected to the drive wheels of the vehicle.
A solenoid-operated hydraulic valve, which supplies pressurized fluid to engage and release the bypass clutch, is controlled by operation of a feedforward and feedback control system.
The position of the throttle valve and the speeds of the torque converter impeller and turbine are applied as input to a mathematical model programmed in algorithmic form for execution by a digital microprocessor.
The engine produces a signal representing the predicted torque output by the engine, which signal is altered by the usually small torque carried by the converter and is then applied as the net torque input to an inverse nonlinear mathematical model of the solenoid-operated valve that supplies hydraulic fluid to the bypass clutch
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Exercise Devices 
