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How does the proportional solenoid valve of the excavator hydraulic pump work?


Excavator proportional solenoid valve variable control process: engine speed sensor → electronic controller → proportional solenoid valve → proportional solenoid valve output oil pressure is introduced into the main pump variable plunger to control the pump output flow. Make the hydraulic pump power basically the same as the engine speed (power) at any speed.

1. The control signal of the proportional solenoid valve of the volvo/Volvo excavator is a current signal, and the input oil pressure is the pilot pressure oil; the higher the rotational speed, the larger the control current, the smaller the output oil pressure of the proportional solenoid valve, and the larger the output flow of the pump.

2. The working principle of the proportional solenoid of the hydraulic pump of the Volvo/Volvo excavator: When the excavator suddenly encounters a high load (such as when a boulder is suddenly digged at the beginning of digging silt), the regulator has no time to control the flow of the hydraulic pump to decrease rapidly,* **It is possible to make the excavator suffocate. The first sign of flameout occurs is that the actual speed of the engine decreases. When the computer senses that the engine speed is lower than the specified speed of the accelerator knob through the engine speed sensor, it immediately controls the proportional solenoid valve to open and uses the pilot pressure to quickly reduce the hydraulic pump flow to ensure that the engine will not stall. Turn off the flame.