| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in hydraulic pressure control using a solenoid flow control valve that the moment the valve is opened, oil pressure pulsation is caused to generate abnormal sound owing to a sudden increase in command current. SOLUTION: A feed forward control part 220 calculates a feed forward current IF from the gradient of a target hydraulic pressure Pref. A feedback control part 222 calculates a feedback current IB to make a deviation Perror between the target hydraulic pressure Pref and the control hydraulic pressure Pwc approximate zero. A pulsation reducing current supply part 240 calculates a preliminary pulsation reducing current IG for avoiding the oil pressure pulsation. The sum of the feed forward current IF and the feedback current IB or the pulsation reducing current IG is selected by a command current select part 242, and supplied as a command current I to linear valves 40, 42. COPYRIGHT: (C)2005,JPO&NCIPI
|
