Oil-electric-hydraulic compound four-wheel drive hybrid power system and control method

Abstract

The invention relates to an oil electrohydraulic four-wheel hybrid power system and the control method thereof. The oil electrohydraulic four-wheel hybrid power system has three power sources: an engine, a storage battery, and a hydraulic accumulator. The engine is successively mechanically connected with a clutch, an epicyclic train, a motor, a transmission and a gear train, an inverter is respectively connected with the motor and the storage battery, and a torque coupler is mechanically connected with an electromagnetic clutch and an output shaft of the hydraulic motor pump. A feed port of an overflow valve is communicated with an oil port of a hydraulic accumulator; a feed port of the hydraulic motor pump control assembly is communicated with an oil-out port of a pressure reducing valve. An oil tank is communicated with an oil-out port of the hydraulic motor pump, an oil-out port of the hydraulic motor pump control assembly, and an oil-out port of the overflow valve; an oil-out port of a two-way electro-hydraulic directional control valve is communicated with a feed port of the hydraulic motor pump. The oil electrohydraulic four-wheel hybrid power system has the advantages that the need of high power density and high energy density can be satisfied, the fuel economy of mobiles in different working situations, and the power performance of mobiles can be achieved.

Description

technical field [0001] This patent belongs to the technical field of hybrid drive technology for engineering vehicles, and in particular relates to an oil-electro-hydraulic compound four-wheel drive hybrid system and a control method. Background technique [0002] At present, air pollution has become one of the most important risk factors for human health. As the number of vehicles increases year by year, energy and environmental protection issues have become urgent. However, the traditional internal combustion engine technology is very mature, and it is difficult to change the current situation unless there is a replacement for new energy sources. Therefore, before the emergence of new energy sources, hybrid technology, as a new technology to reduce fuel consumption and reduce harmful gas emissions, has been paid more and more attention. [0003] The driving methods of hybrid electric vehicles are generally divided into three types: series, parallel and hybrid. No matter w...

AI Technical Summary

Problems solved by technology

However, although the accumulator is used alone for energy storage, although it has strong fast charging and quick release capabilities, its small energy density is not suitable for long-term charging or discharging, so it is only suitable for vehicles with frequent starting and braking conditions.

However, the use of batteries alone solves the problem of long-term charging and discharging, but it is difficult to charge and amplify the current instantaneously, which cannot meet the needs of starting the vehicle.

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