Based on the two-level controller of the IMCS containing the mode switching of cylinder and the individual valve control, there exists the additional energy-saving potential by introducing an electronically controlled pump (ECP) where supply flow, pressure, or power can all be controlled electronically. Therefore, a novel pump-valve coordinate control method is proposed in this chapter. To take full advantage of the energy-saving potential of IMCS in the regeneration or recuperation mode, the configurations of valve and pump modes should match with the selection of cylinder modes. Considering the distinguishing configuration of pump-valve coordinate control between resistive and overrunning loads, the multi-variable controllers are designed respectively. Consequently, the inlet loss, outlet loss, and potential energy loss can be optimized simultaneously. The experimental validation is conducted by a 2-ton excavator. A duty cycle of movement including all three actuators and covering full load quadrants is used to evaluate the efficiency improvement. Compared with the conventional load sensing system, the proposed multi-mode switching system using the pump pressure control with valve meter-in control yields a 25.8% energy-saving ratio. Furthermore, the pump flow control with valve mete-out control yields a 35.3% energy-saving ratio. Moreover, the motion tracking performance is not degraded by introducing the pump-valve coordinate control.
Pump-Valve Coordination Control
Independent Metering Electro-Hydraulic Control System ; Chapter : 5 ; 79-102
2024-02-21
24 pages
Article/Chapter (Book)
Electronic Resource
English
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