| 摘要 |
PURPOSE:To reduce the generation of a speed change shock based on a torque phase period, an amount or a rate of a change in the number of revolutions of a turbine during the period, a line pressure in an inertia phase period is varied. CONSTITUTION:An ECU 100 controls a speed change of a multistage transmission mechanism 10 of an automatic transmission AT through an oil pressure control circuit 30 by means of parameters being a throttle opening and the number of revolutions of a turbine from sensors 101 and 102 based on a speed change pattern. During the speed change, a line pressure control means 103 drives a duty solenoid valve 33 so that a line pressure in an inertial phase period is controlled based on a torque phase period and/or an amount of a change in the number of revolutions of a turbine during the period or a rate of a change in the number of revolutions of a turbine during the torque phase period, and varies a line pressure regulated by a pressure regulator valve 32. Based on an increase and a decrease in the number of revolutions of a turbine, a line pressure is properly controlled, and the generation of a speed change shock can be reduced. |
