An oil-electric-hydraulic hybrid hydrostatic drive system

Abstract

The invention discloses an oil electro-hydraulic and hydrostatic hybrid driving system. The functions of rapid starting, rapid braking, controlling minus grade to be at constant speed and energy-saving can be realized by adopting a concept of supplying oil for accelerated starting with a hydraulic assisted starting motor, a main hydraulic system and an energy storage system, and controlling the torque of a motor through a hydraulic energy accumulation system, and the overall installed power can be reduced while the climbing ability can be increased. By virtue of the assisted starting, the impulse current of the motor is mainly eliminated, not only can the rated power of electric elements be reduced, but also the working life of a storage battery and the mileage of the whole vehicle can be prolonged. By adopting the motor and a diesel engine as double power, the good starting acceleration performance can be realized, and good low-speed stepless regulation capability can also be achieved. The oil electro-hydraulic and hydrostatic hybrid driving system can be switched to a mechanical driving system in high-speed driving, so that the whole machine has higher driving efficiency. The diesel engine provides power for powerless batteryor high-speed driving on the ground, not only can the tail gas pollution in a tunnel be avoided, but also the intermittent driving of vehicles can be guaranteed.

Description

technical field [0001] The invention belongs to an electromechanical-hydraulic integrated driving system, in particular to an oil-electric-hydraulic hybrid hydrostatic driving system. Background technique [0002] Rail engineering vehicles are used for railway engineering construction and operation and maintenance. They have the functions of traction, providing operating platforms, lifting and handling, and providing temporary power sources. Rail cars and operating vehicles are one of the most widely used types of vehicles. The power configuration and drive system form of railcars and work vehicles for ordinary-speed railways, high-speed railways and subways are basically the same, and most of them are powered by diesel engines and mechanical gearboxes (or hydraulic gearboxes). The driving system is mainly to meet the basic functions of the whole machine traction, without matching design of system parameters based on working conditions and rational distribution and utilizati...

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