| 摘要 |
PURPOSE:To reduce the extent of penetration of the outside air as well as to prevent a pumping noise from occurring by controlling the opening of an inlet passage to the maximum with a valve means when such a state that a rise in negative pressure in a suction chamber in the pump inside is foreseen, and then keeping off any unneces sary increase of the negative pressure in the suction chamber. CONSTITUTION:A controller 2 regulates flow of working fluid which has reached a suction circuit 30 from a reservoir 29 and flows into an inlet passage 18, and it is provided with a spool valve 31. At this juncture, at time of engine starting, the maximum value of a command current value is inputted into a coil 45 of a magnetic solenoid 43 in spite of small requested flow rate of an apparatus 27 by a controller 48 according to a signal out of an engine starting detector 47. This input is executed as long as the specified period of time, and for the while pressing force of a spool 33 is increased. Then, the total of spring force of a spring 37 and magnetic force out of a pushrod 46 is made larger than the pressing force of a feedback plunger 39 where pressure in a working pressure circuit 28 is made to work by way of a capacity control pressure circuit 40. With this constitution, the spool 33 is stopped at a position where an opening area becomes maximum, thus opening of the inlet passage 18 is maximized. |
