| 摘要 |
PROBLEM TO BE SOLVED: To provide a low power consumption-type hydraulic system which reduces the consumption of a battery DC power source by reducing the electric power consumed in an electromagnetic solenoid. SOLUTION: When a start signal is inputted to a microcomputer 1, a switching element driving part 2 is operated on the basis of a set program, and a switching element 3 is driven with 0% modulation by 100 ms at an initial period of the operation, and then with 90% modulation thereafter by controlling the modulation of pulse widths. The electric current from a DC power source 7, flows to the electromagnetic solenoid 5 in a rated state during 100 ms in an ON state of the switching element 3, the electric current is reduced to approximately 1/10 during the ON-OFF 90% modulation to be the predetermined holding current of the electromagnetic solenoid 5. When the start signal is stopped, the switching element 3 is kept in an OFF state, and the operation of the electromagnetic solenoid 5 is stopped. COPYRIGHT: (C)2003,JPO
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