Parallel series dynamical system of engineering machinery

Abstract

The invention relates to a parallel series dynamical system of engineering machinery. The parallel series dynamical system comprises two parts namely a travelling mechanism power system and a working device power system, wherein the walking mechanism power system and the working device power system are connected through a transfer case and a clutch, and the walking mechanism power system is a parallel type oil-liquid hybrid power system; and the working device power system is a series type oil-electricity-liquid hybrid power system. Through controlling the connection and the disconnection of an electricity generator clutch, a hydraulic travelling driving clutch and an engine clutch, the purpose of shifting a parallel type hybrid mode and a series type hybrid mode can be realized, and braking energy of the working device and the travelling mechanism can be recycled and reused through a hydraulic accumulator and a power battery. According to the hybrid dynamical system disclosed by the invention, not only can the advantages of the parallel connection system and the advantages of the series connection system be fully brought out, but also the energy recycling efficiency of the working device can be improved through the combination of hydraulic energy storage and battery energy storage, and the complete engineering machinery fuel oil consumption is effectively reduced.

Description

technical field [0001] The invention belongs to the field of construction machinery, and in particular relates to a hybrid power system of construction machinery. Background technique [0002] The current oil resources are increasingly scarce, and the independent drive technology of electric energy is not yet mature. Oil-hydraulic hybrid technology has become the most promising vehicle energy-saving technology, especially in the field of construction machinery, its energy-saving technology is becoming more and more remarkable. Traditional construction machinery is usually driven by diesel engines. Due to its complex and changeable working conditions, it needs to switch frequently between driving conditions and working conditions, and has high power requirements. Therefore, it is difficult for the engine to work in the low fuel consumption area for a long time. Moreover, the frequent starting and braking operations of construction machinery under heavy loads cause serious ...

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Problems solved by technology

In the oil-electric hybrid, due to the low power density of the battery, it is difficult to achieve rapid charging and discharging of a large current, and the energy recovery is not high, and the efficiency of the power system is low; in the oil-liquid hybrid, the accumulator is usually used as the storage device. energy device, although its power density is high, but the energy density is small, not suitable for continuous driving

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