Multi-energy multi-motor hydraulic excavator electro-hydraulic mixing driving system and control method

Abstract

The invention discloses a multi-energy multi-motor hydraulic excavator electro-hydraulic mixing driving system and a control method. The multi-energy multi-motor hydraulic excavator electro-hydraulic mixing driving system comprises a power battery, a super capacitor, an energy management unit, a power motor, a motor controller, a forerunner operating handle, a hydraulic energy accumulator, an oil tank, a hydraulic pump / motor, a plurality of electromagnetic reversing valves, a plurality of pressure sensors, an overflow valve, an open center six-way proportion direction valve, a boom cylinder and the like. According to the multi-energy multi-motor hydraulic excavator electro-hydraulic mixing driving system and the control method, the power battery, the super capacitor and the hydraulic energy accumulator serve as composite energy sources, the energy density is ensured through the power battery, the instantaneous large power of an electric driving system is provided or absorbed by the super capacitor, and the instantaneous large power of a hydraulic driving system is provided or absorbed by the hydraulic energy accumulator; and a power system is driven by the power motor and the hydraulic pump / motor in a collaborated and mixed mode, multiple power composite modes are achieved by fully utilizing the stepless speed regulating characteristics of the power motor and the hydraulic pump / motor, and thus the requirements for the power of various complex working conditions of a hydraulic excavator are met.

Description

technical field [0001] The invention relates to the technology in the field of energy saving and emission reduction of construction machinery, in particular to an electro-hydraulic hybrid drive system and control method for a multi-energy multi-motor hydraulic excavator. Background technique [0002] Energy saving and emission reduction are of great significance to construction machinery, among which hydraulic excavator is a kind of construction machinery with high power and complex working conditions, and its total utilization rate of energy is low. Therefore, the realization of energy saving and emission reduction of hydraulic excavators has always been the goal pursued by the industry. Among them, hybrid drive technology and pure electric drive technology are current research hotspots. [0003] Hybrid drive technology has achieved certain results in the energy saving and emission reduction of construction machinery, but it also has the characteristics of high cost, compl...

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Problems solved by technology

[0006] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide an electro-hydraulic hybrid drive system and control method for a multi-energy, multi-motor hydraulic excavator, which can effectively solve the problems existing in existing hybrid drive construction machinery. High cost, complex control, and difficulty in achieving zero emissions

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