Patent Document ID: 20020029136
Application ID: 09925743
Patent Flag: 0

Claim One:
1. A simulator having computer-aided design programs for simulating a shift control algorithm stored in a shift controller of an automatic transmission mounted on a vehicle and having a hydraulic actuator to transmit power generated by an internal combustion engine to drive wheels based on at least throttle opening and vehicle speed in accordance with the shift control algorithm, comprising; a control system design tool which is connected to the shift controller to inputs the shift control algorithm and which outputs a hydraulic pressure supply command based on the inputted shift control algorithm; a first simulator section which is connected to the control system design tool to inputs the hydraulic pressure supply command and which estimates an effective clutch pressure that is assumably generated in the hydraulic actuator in response to the hydraulic pressure supply command based on a first model describing entire system including the transmission; and a second simulator section which is connected to the control system design tool and the first simulator section and which determines transfer functions of a second model describing behavior of the hydraulic actuator such that an output of the second model converges the estimated effective hydraulic pressure; wherein the second simulator section simulates and evaluates the shift control algorithm based on a third model obtained by incorporating the second model with the first model.