Basic principles of Komatsu CLSS closed center load sensing system:
1. Pump swash plate angle control
1. Pump swash plate angle (pump output) It is controlled so that the LS differential pressure (APLS) (the difference between the pump pressure PP and the control valve outlet LS pressure PLS) (the load pressure of the actuator) can be stabilized.
[LS pressure difference (APLS)=pump output pressure (PP)-LS pressure (PLS)]
2. If the LS pressure difference (APLS) is lower than the LS valve setting At a constant pressure (when the actuator load pressure is high), the pump swash plate angle changes to the maximum position.
3. If the LS pressure difference (APLS) is higher than the set pressure of the LS valve (when the actuator load pressure is low), the pump swash plate angle changes to the minimum position.
2. Pressure compensation control
Pressure compensation is installed on the outlet side of the control valve to balance the load.
1. When the actuators operate together, the pressure difference (AP) between the upstream pressure (inlet) and downstream pressure (outlet) of the spool of each valve becomes equal and is equal to the load (pressure ) has nothing to do with the size.
2. The flow of oil from the pump is divided (compensated) in proportion to the opening area (S1) and (S2) of each valve.