| 摘要 |
PROBLEM TO BE SOLVED: To drain oil pressure of a forward clutch from a manual valve at the time of change from forward running to a reverse running. SOLUTION: This hydraulic control circuit of automatic transmission for vehicle with automatic stop engine comprises: a firs oil pump 2 driven by the engine 1; a second oil pump 8 driven by an electric motor 7 operated at engine stop; and a first selector valve 11 for selectively connecting a first oil passage 33 from the first oil pump 2 and a second oil passage 36 from the second oil pump 8 with a third oil passage 35 connected to the clutch for forward running. The first selector valve 11 connects the first oil passage 33 with the second oil passage 36 when oil pressure acts on the first oil passage 33 or the oil pressure doesn't apply on both of the first oil passage 33 and the second oil passage 36. When the oil pressure applys on the second oil passage 36, the first selector valve 11 connects the second oil passage 36 with the third oil passage 35. |
