Load sensing control of small excavator

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In order to eliminate the power loss of closed center system under non-heavy load condition, a pressure compensation method was proposed to compensate the flow of hydraulic pump in the century. Because flow compensation requires the load pressure signal as a response signal of control, flow compensation is later generally called load sensing control, load sensing control can make the output pressure and flow of the hydraulic pump actively accustomed to the requirements of the load, useful to improve the power of the hydraulic system. At present, there is no clear definition of load sensing, but as a system concept, load sensing has a wide range of meanings. It is particularly clear here that the load sensing concepts described below are limited to the scale of closed central variable systems.

Load sensing control can make the output pressure and flow of the pump actively adapt to the load demand, and greatly improve the power of the hydraulic system. The use of load sensing control for walking construction machinery such as small excavator was not actually used in Europe until the year 2000 for hydraulic small excavator. After entering the era, Japan also began to study and launched a series of corresponding small excavator products, such as Komatsu's One and Hitachi Construction Machine's first. Load sensing control is applied to hydraulic small excavator, in order to better ensure normal operation, the pump output pressure can only be used with the highest load pressure, that is, load sensing control only works on the highest load circuit, and pressure compensation is selected for other loops with lower load pressure, so that the pressure difference of the valve port continues to maintain a fixed value. When the valve opening is too large, so that the flow required by the system exceeds the oil supply capacity of the pump, the speed of the performing element on the highest load circuit will decrease until the movement is stopped, so that the small excavation motor will lose coordination.

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