A hydraulic hybrid vehicle transmission system based on planetary transmission

Abstract

The invention discloses a hydraulic hybrid vehicle transmission system based on planetary transmission, which solves double-output control and three-degree-of-mechanical-freedom control problems. The hydraulic hybrid vehicle transmission system based on the planetary transmission comprises three groups of hydraulic pumps / motors, an engine, a front output shaft, a back output shaft, three rows of planetary gear mechanisms, two clutches and a brake. The engine, the hydraulic pumps / motors, the front output shaft and the back output shaft are connected in the three rows of planetary gear mechanisms, wherein the engine is not directly connected with the front output shaft and the back output shaft through the planetary gear mechanisms; the front output shaft and the back output shaft are not directly connected with each other through the planetary gear mechanism; and the front output shaft and the back output shaft are also not directly connected with the brake. According to the invention, through adoptions of the three rows of planetary gear mechanisms, the three groups of hydraulic pumps / motors can all realize driving or braking; through coordinated control, functions such as parallel-series driving, engine starting and the like of the system are realized; and meanwhile, working points of the engine can be adjusted to provide a power needed by vehicle accessories; therefore, control structure and function integration of the system are realized.

Description

technical field [0001] The invention relates to the hybrid power transmission technology of mechanical transmission and hydraulic transmission, in particular to a hydraulic hybrid vehicle transmission system based on planetary transmission. Background technique [0002] The current hydraulic hybrid system includes an engine and a hydraulic power system. The hydraulic power system uses a hydraulic accumulator as an energy storage component and a hydraulic pump / motor as a power component. Because the hydraulic power system has the advantages of high power density, high braking energy recovery rate, safety and reliability, low cost, energy saving and environmental protection, it is widely used in heavy vehicles such as buses and construction machinery. [0003] The current transmission system mostly adopts the serial working mode, that is, the engine outputs kinetic energy through the motor after the engine stores energy through the hydraulic pump, but the energy conversion eff...

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Problems solved by technology

Some researchers have also begun to conduct research on the planetary gear structure with dual output of the front and rear axles (All-wheel Drive, AWD), but have not established a system method design research on the planetary gear structure with dual output, and related research has just started

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