Patent ID: 8386138
Filing Date: 2013-02-26
Classification: B60W,F16D,F16H

Abstract:
1. An engagement pressure control apparatus for a starting frictional element at a time of an idle stop control of a vehicle, comprising: an engine; drive wheels; a transmission configured to transmit a power of the engine to the drive wheels via the starting frictional element under a gear shift; a gear shift control section configured to perform a gear shift control for the transmission by means of a hydraulic pressure from an engine driven oil pump driven by the engine, during a driving of the engine; and an idle stop control section configured to, when a predetermined condition is established, perform an idle stop such that the engine is automatically stopped and make the starting frictional element an engagement start immediate before state according to the engagement pressure produced by a partial draining of a working oil from an electrically-powered oil pump by means of a starting frictional element engagement pressure control section and to, when the predetermined condition becomes un-established, restart the engine in response to a release of the idle stop and make the engine a driving operation responding state, at a time of a vehicle stop determination, wherein, during an operation of the idle stop control section, a drain port opening angle of a clutch hydraulic pressure control valve for an engagement pressure command value issued to the starting frictional element engagement pressure control section is made small as compared with the drain port opening angle of an ordinary control in accordance with an input torque of the starting frictional element.