| 摘要 |
<P>PROBLEM TO BE SOLVED: To properly control hydraulic pressure to act on an engaging side clutch of a transmission gear mechanism for an automatic transmission during engine idle stop control. <P>SOLUTION: Pressure reducing control is executed during fuel cut of the engine by reducing hydraulic pressure to act on the engaging side clutch (a clutch LC, e.g.) of the transmission gear mechanism 15 and releasing the engaging side clutch. Pressure increasing control is executed at engine restart by increasing the hydraulic pressure to act on the engaging side clutch and engaging the half-engaged engaging side clutch. Additionally, when a rotating speed difference between a clutch output side rotating speed (a rotating speed obtained by multiplying an output side rotating speed No by the gear ratio of a first speed) and an input side rotating speed Nt reaches a predetermined value or more during the pressure reducing control, the engaging side clutch is determined to start slipping, and the hydraulic pressure at that time is learned as reference hydraulic pressure. During the pressure reducing control or the pressure increasing control, the hydraulic pressure to act on the engaging side clutch is controlled on the basis of a learned value of the reference hydraulic pressure. <P>COPYRIGHT: (C)2012,JPO&INPIT |
