| 摘要 |
PROBLEM TO BE SOLVED: To provide a system which secures favorable responsiveness with respect to a start requirement during a stop of an engine even if there occurs an abnormality in the supply of hydraulic pressure to a starting friction fastening element from a hydraulic pressure source such as an electric oil pump which operates in an engine stop state such as an idle stop time.SOLUTION: A hydraulic pressure control method of an automatic transmission supplies hydraulic pressure generated at a first hydraulic pressure source 6 driven by an engine to a first friction fastening element 60 for obtaining a first gear change ratio when obtaining the starting first gear change ratio during an operation of the engine, and when obtaining the first gear change ratio during a stop of the engine, supplies hydraulic pressure generated at a second hydraulic pressure source 106 which operates irrespective of the engine to the first friction fastening element 60. When there arises a prescribed state during the stop of the engine, the hydraulic pressure control method supplies the hydraulic pressure generated at the second hydraulic pressure source 106 to a second friction fastening element 50 for obtaining a second gear change ratio which is different from the first gear change ratio.SELECTED DRAWING: Figure 3 |
