Patent Document ID: 6078856
Application ID: 08835165
Patent Flag: 1

Claim One:
1. A system for adapting pressure used to produce a gear ratio change in an automatic transmission having a torque converter turbine and adapted for use with an engine having a throttle, comprising: a throttle position sensor producing a signal representing the position of the engine throttle; a turbine speed sensor producing a signal representing turbine speed; a computer having input ports adapted to receive the signal produced by the turbine speed sensor and throttle position sensor; and a timer initiated at the start of each gear ratio change for determining with the aid of the computer slope time and slip time during a gear ratio change, the computer provided with electronic memory containing information processing instructions including a first fuzzy logic system having adaptive pressure adjustment values referenced to turbine speed and engine torque for determining an initial pressure adjustment corresponding to current turbine speed and current engine torque; a second fuzzy logic system having slip time target values referenced to turbine speed and engine torque for determining a slip time target corresponding to current turbine speed and current engine target; a third fuzzy logic system having adaptive pressure values referenced to target error, the difference between the slip time target and slip time, and target ratio, a ratio of the slope time and slip time target, for determining a pressure correction corresponding to target error and target ratio; the computer being provided with instructions for producing corrected pressure adjustment values corresponding to current turbine speed and current engine torque using said pressure correction and adaptive pressure adjustment values; and replacing said adaptive pressure adjustment values of the first fuzzy logic system corresponding to current engine torque and turbine speed with the corrected adaptive pressure adjustment values; a friction element engaged to produce a gear ratio change; and a solenoid-operated pressure source for supplying fluid to said friction element at a pressure that changes in response to a signal produced by the computer representing said corrected pressure adjustment.