Oil hybrid system for excavator with energy differential recovery

Abstract

The invention discloses an oil hybrid system for an excavator with energy differential recovery, belonging to the technical field of energy-saving control of a hydraulic excavator, including: a controller, a transfer case, a variable pump, a variable motor, a reversing valve, a one-way valve and an accumulator, so that the energy differential recovery function and the oil hybrid function can be combined hydraulically. The accumulator is used as the energy storage unit, the variable pump and the variable motor are used as the auxiliary power unit, and power coupling is completed by the transfer case and the engine. The controller solves the matching problem of master and auxiliary power sources according to control rules, to stabilize the engine to work in the high-efficiency fuel zone. In the invention, energy from the hydraulic system and power system of the excavator can be maximally recovered, distributed and reused, the working efficiency of the engine can be optimized, the fuel economy of the excavator can be improved, and the system exhaust can be reduced.

Description

technical field [0001] The invention relates to an excavator energy recovery system and an oil-fluid hybrid power system, and is an excavator oil-fluid hybrid power system with energy differential recovery. Background technique [0002] The power system of ordinary excavators is driven by the engine alone to drive the hydraulic pump, and the working conditions are completely determined by the load of the main pump. Once the load fluctuates greatly, the engine operating point will also fluctuate greatly, and it cannot work stably in the high-efficiency fuel area, resulting in energy waste and increased fuel consumption. In addition, ordinary excavators do not recycle the boom’s lowering energy, causing it to be lost in the form of heat energy at the throttle, which not only causes the system energy to be lost in vain, but also increases the temperature rise of the system, causing cavitation and other hydraulic system defects. Therefore, the development of an excavator hybrid...

AI Technical Summary

Problems solved by technology

The parallel hybrid hydraulic excavator systems of Komatsu and Hitachi use a separate hydraulic motor-generator to recover the potential energy of the boom lowering. The hydraulic motor of this system is connected in parallel in the oil circuit. throttling loss

The above hydraulic excavator oil-electric hybrid system and its energy recovery system convert the energy of the excavator into electric energy and store it in the battery or super capacitor. For the rapid and frequent load changes of the excavator, the energy conversion and storage efficiency is low, and the components Expensive, making it difficult for the system to be widely used

Images