Study on An Application of Digital-Hydraulic Pressure Reducing Circuit to Pilot-Pressure Supply Circuit of Construction Machinery

In recent years, construction machinery has become increasingly electronically controlled. As a result, the number of electronic-hydraulic components such as proportional solenoid valves in hydraulic circuits of construction machinery has increased, and consumption flow of a pilot hydraulic pressure source to drive these components has continued to increase. The pilot hydraulic source consumes approximately 2 to 3% of engine horsepower in a typical excavator operation, and more energy-efficient methods are desired.