| 摘要 |
PROBLEM TO BE SOLVED: To provide a solenoid proportional valve control device for a construction machine, capable of easily changing an output range of a plurality of solenoid proportional valves of a hydraulic system for the construction machine by controlling software without changing a controller or an internal constant. SOLUTION: The solenoid proportional valve control device for the construction machine comprises a CPU 14 for outputting a command signal for a current to flow in the solenoid proportional valve, a D/A converter 16 for converting the command signal into a voltage signal, a resistance circuit part 20 for dividing the voltage signal and outputting a plurality of voltage signals, a first multiplexer 31 for selecting one of the plurality of voltage signals, a second multiplexer 32 for supplying the voltage signal to a corresponding channel, capacitors 34-1 to 34-n for holding voltage, PWM conversion circuits 35-1 to 35-n for converting the voltage held by the capacitors into a pulse signal, and switching transistors 12-1 to 12-n for generating a current to flow in the solenoid proportional valve in accordance with the pulse signal. COPYRIGHT: (C)2007,JPO&INPIT
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