| 摘要 |
An automatic transmission comprises an electronic control unit and a hydraulic control unit. The electronic control unit commands an engagement command pressure to a solenoid disposed in a hydraulic control unit until the time engagement element pressure generated by the solenoid reaches to a shelf pressure, thereby an upshift of the automatic transmission is achieved. The engagement command pressure is corrected in a decrease direction when a maximum rate of change of a gear ratio is larger than a rate of change of a thrust-up determination gear ratio, and the engagement command pressure is corrected in a rise direction when the maximum rate of change of the gear ratio is smaller than a rate of change of a prolongation determination gear ratio. Thus, by correcting an engagement command pressure using the maximum rate of change of the gear ratio, a proper output shaft torque wave form can be obtained. Therefore, a fluctuation of an output shaft torque at the time of a torque phase during the upshift has no strong influence on an acceleration of a vehicle, As a result a shift of a comfortable feeling can be achieved.
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