초록 ▼

A method for controlling operation of a hydraulic valve having a magnet fixed to a displaceable spool, a sensor producing a signal responsive to the sensed intensity of a field produced by the magnet representing the position of the spool in the valve spool, the method comprising producing from the

A method for controlling operation of a hydraulic valve having a magnet fixed to a displaceable spool, a sensor producing a signal responsive to the sensed intensity of a field produced by the magnet representing the position of the spool in the valve spool, the method comprising producing from the signal a time series record of the position of the spool; determining the desired position of the spool, producing a error signal from the difference between actual and desired spool position, determining a compensated correction error, producing a commanded control pressure signal to change the magnitude of control pressure supplied to the valve, and changing the position of the spool in response to the control pressure signal.

대표청구항 ▼

[ We claim:] [1.] A method for controlling operation of an automatic transmission having a hydraulic valve that controls operation of a friction element, having a magnet fixed to a displaceable valve spool, a sensor producing a signal responsive to the sensed intensity of a field produced by the mag

[ We claim:] [1.] A method for controlling operation of an automatic transmission having a hydraulic valve that controls operation of a friction element, having a magnet fixed to a displaceable valve spool, a sensor producing a signal responsive to the sensed intensity of a field produced by the magnet representing the position of the spool in the valve, the method comprising the steps of:producing from the signal a time series record of the position of the spool;determining the desired spool position;determining a spool position error from the current spool position and desired spool position;determining a compensated spool position from said spool position error;determining a current commanded control pressure from said compensated spool position and a prior commanded control pressure;changing the magnitude of control pressure applied to the valve in response to said current commanded control pressure; andchanging the position of the spool in response to the current control pressure.