| 摘要 |
<P>PROBLEM TO BE SOLVED: To reliably determine whether a variable displacement pump is in the full-displacement operating condition or in the partial-displacement operating condition. <P>SOLUTION: A variable displacement oil pump OP which discharges oil sucked from a pair of suction ports 16A, 16B from a pair of discharge ports 17A, 17B can be changed over between the full-displacement operating condition and the partial-displacement operating condition by using a shift solenoid valve 31 for operating a pump shift valve 28. Since the pump shift valve 28 which is opened and closed according to whether the oil pump OP is in the full-displacement operating condition or in the partial-displacement operating condition is disposed in oil paths P17, P18 for connecting an oil pressure source for modulator pressure and a pressure switch 32, an electronic control unit can reliably determine, on the basis of the output of the pressure switch 32, whether the oil pump OP is in the full-displacement operating condition or in the partial-displacement operating condition. <P>COPYRIGHT: (C)2012,JPO&INPIT |
