| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling a liquid-pressure fluid flowing from its source to precisely and surely change the phase angle of the camshaft to the crankshaft. SOLUTION: The intended objective is attained by detecting the position of a camshaft and a crankshaft, by issuing electric signals corresponding to the stated phase angle through an engine control unit, and by controlling the position of a spool for exhausting pressure from within a cave in the spool valve, which is so arranged as to be able to slide within the main body of the spool valve; with this control carried out by utilizing an electric machinery-type actuator equipped with a force-variable solenoid to change the position of the spool having the aforementioned exhaust port, by making the aforementioned spool valve allow or prevent inflow of the liquid-pressure fluid into aforementioned housing through the entry line and return line, and by controlling the position of the spool in the spool valve. COPYRIGHT: (C)2005,JPO&NCIPI
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