Driving and energy recovery system for hybrid excavator

Abstract

The invention discloses a driving and energy recovery system for a hybrid excavator, which is characterized in that a master valve, an engine, a master variable pump, a recovery motor, an auxiliary variable pump, a motor controller and an energy storage element are all connected with a hybrid control unit; the hybrid control unit is also provided with an operating signal input interface and a pressure feedback signal input interface; and a driving motor, a recovery motor, a turning motor and the energy storage element are all connected with the motor controller. The driving and energy recovery system for the hybrid excavator can recover energy comprehensively, has good energy-saving effect and can not affect the stable operation of the engine.

Description

Technical field [0001] The invention relates to an engineering machinery hybrid power system characterized by mechatronics-hydraulic integration technology, in particular to a hybrid power excavator drive and energy recovery system. technical background [0002] As we all know, the existing hydraulic excavator is widely used, and at the same time it has the shortcomings of high fuel consumption and poor emission, so the energy-saving research of hydraulic excavator has very important practical significance. At present, hybrid excavators are recognized as the most promising energy-saving solution, so the development of relevant research is of great significance to the mature application of hybrid technology. [0003] At present, some domestic enterprises and scientific research institutes have also begun the related research of construction machinery hybrid power, and have achieved some phased results, mainly: (1) As disclosed in the patent publication number CN101037869A: hybrid co...

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Problems solved by technology

[0004] The above-mentioned patents have made useful explorations from the structure of the hybrid power system and the energy recovery method of the working device, but there are also some deficiencies: (1) Patent CN101037869A uses a power distributor to realize power generation / electric motor and hydraulic pressure in the driving mode of hybrid power. The parallel connection of pumps makes the installation of components more difficult due to the limited installation space of construction machinery

(2) Patent CN101408212A, the potential energy of the boom is recovered by using a recovery motor, an accumulator and a generator. Although this is beneficial to improve the power generation condition of the generator to a certain extent, since the outlet of the accumulator is directly connected to the main The pump is connected. When the hydraulic system pressure is higher than the accumulator pressure, the energy stored in the accumulator will not be released when the boom is lowered.

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