A required draining capacity of an electrically-powered
oil pump is reduced and a small
sizing of the electrically-powered
oil pump is achieved by devising how to issue a starting frictional element engagement pressure command value.[Means for Solving the Problem]An engine is restarted in response to an idle stop OFF command at t1 so that a gear shift control purpose
hydraulic pressure is raised according to a working oil from an engine driven
oil pump. An idle stop
release time control of the engine is allowed according to a torque down unnecessary determination when a gear shift control purpose
hydraulic pressure has reached to a set
hydraulic pressure at t2. In a case where this allowance causes an engine torque Te to be raised from a torque down value toward a driving operation corresponding value by a predetermined gradient ΔTe1, a command value of a starting frictional element engagement pressure PS is set to a control maximum value (a drain port opening angle of a
clutch hydraulic
pressure control valve for a
clutch hydraulic pressure (an engagement pressure) command value is made small as compared with that in a case of an ordinary control (is made difficult to drain)) during the idle stop control including during the idle stop
release time control. Thus, when starting frictional element engagement pressure PS is controlled upon
receipt of this command value, the working oil from the electrically-powered oil pump is not needed to be drained. Consequently, the electrically-powered oil pump is not needed to
discharge this draining working oil and the small-
sizing can be achieved.