Excavator Hydraulic Bleed Valve Control for Pressure Pulsation

The patent divides the single cut valve into multiple independent cut valves, each corresponding to a specific hydraulic actuator. This segmentation allows independent control of bleed-off for each actuator, enabling precise control of pressure pulsation while maintaining turning operability. The multiple cut valves work in conjunction with their respective directional control valves to manage hydraulic flow and pressure independently for each function.

The patent dynamically changes the opening degree parameter of the cut valves based on detected pressure pulsation levels. When pressure pulsation exceeds a predetermined threshold, the control device adjusts the opening degree of the cut valves to increase bleed-off and reduce pulsation. This parameter adjustment allows the system to respond adaptively to pressure conditions while maintaining stable turning operability.

The patent employs dynamic control of the bleed valve opening area based on real-time pressure pulsation detection. The control device continuously monitors pressure pulsation and adjusts the bleed valve opening degree accordingly, increasing it only when pulsation exceeds thresholds and decreasing it when pulsation is within acceptable ranges. This dynamic adjustment minimizes hydraulic energy waste while effectively controlling pressure pulsation.

The patent implements a feedback control mechanism where the control device receives detection results from pressure sensors and adjusts the bleed valve opening degree accordingly. The feedback loop compares actual pressure pulsation with predetermined thresholds and modifies the bleed valve position to maintain optimal pressure conditions, thereby reducing energy waste while controlling pulsation effectively.