Variable ratio hydrostatic drive system

Abstract

The invention discloses a hydrostatic drive system with variable speed ratio, relates to the technical field of energy saving and is used for solving the problem of high cost of hydraulic hybrid power equipment in the prior art. The hydrostatic driving system includes a driving system for getting off the vehicle and a driving regeneration control system. The driving system for getting off the vehicle includes an engine, a first transmission mechanism, a power coupler, a second transmission mechanism and wheels, and the engine transmits power to the wheels through the power coupler. The driving regeneration control system includes a pump motor, a third transmission mechanism and an accumulator; the power coupler is connected to the pump motor through the third transmission mechanism, and the pump motor is connected to the accumulator. When the power of the whole vehicle is sufficient, the power coupler is in high-grade and the pump motor is in the pump working condition. The power coupler drives the pump motor to run to realize the conversion and storage of mechanical energy. When the power of the whole vehicle is insufficient, the power coupler is in low gear, the pump motor is in the motor working condition, and the hydraulic pressure released from the accumulator drives the pump motor to run. The technical solution described above has low cost.

Description

technical field [0001] The invention relates to the technical field of energy saving, in particular to a hydrostatic drive system with variable speed ratio. Background technique [0002] The hydraulic hybrid vehicle is a new type of hybrid transmission system based on the secondary regulation hydrostatic transmission technology. It utilizes the characteristics of the hydraulic pump motor that can work in four quadrants and the characteristics of the high power density of the accumulator, supplemented by an optimized control strategy , to realize the recovery and release of system energy. The recovered energy can be used to start, accelerate and assist the operation of the loader, thereby reducing the installed power of the EFI engine and improving the power performance and operation performance of the vehicle. Compared with oil-electric hybrid control technology, hydraulic hybrid technology has the characteristics of high power density and low energy density, which also mak...

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Problems solved by technology

[0004] One of the objects of the present invention is to propose a variable speed ratio hydrostatic drive system for solving the problem of high cost of hydraulic hybrid power equipment in the prior art

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