Energy Saving Method for Electro-hydraulic Load-sensing Systems with Flow Feed-forward and Working Chamber Pressure Feedback

doi:10.11832/j.issn.1000-4858.2021.10.001

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CHINESE HYDRAULICS & PNEUMATICS ›› 2021, Vol. 45 ›› Issue (10) : 1-7. DOI: 10.11832/j.issn.1000-4858.2021.10.001

Energy Saving Method for Electro-hydraulic Load-sensing Systems with Flow Feed-forward and Working Chamber Pressure Feedback

SUN Bo-lin¹, CHENG Min¹, DING Ru-qi²

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Abstract

The electro-hydraulic load-sensitive system based on feed-forward control is a volumetric throttling compound speed control system, which can open the valve port fully to reduce energy loss, but under overrunning conditions, the system speed characteristics can be affected by the reduced damping of the valve port, causing problems such as actuator overspeed drops and even safety accidents. To address this problem, a solution is proposed for electro-hydraulic load sensitive systems with post-valve pressure compensation: the load inlet cavity pressure is controlled to a constant value, and a corresponding pressure cascade controller is developed. The controller uses the speed feedback as the inner loop to improve the system's resistance to load disturbances and the PI controller with anti-windup compensation as the outer loop to control the working chamber pressure to a certain value. Test results based on different load conditions on a 2-ton excavator show that the working chamber pressure control can reduce the proportional valve orifice losses while maintaining the actuator speed control performance compared to the traditional direct control orifice by the handle.

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mobile machinery / load-sensing / pressure feedback / energy saving

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SUN Bo-lin, CHENG Min, DING Ru-qi. Energy Saving Method for Electro-hydraulic Load-sensing Systems with Flow Feed-forward and Working Chamber Pressure Feedback[J]. CHINESE HYDRAULICS & PNEUMATICS. 2021, 45(10): 1-7. https://doi.org/10.11832/j.issn.1000-4858.2021.10.001

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Received	Revised	Published
2021-05-10	2021-06-14	2021-10-15
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2021-10-14

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