Double-planet-row multimode hybrid power automobile power transmission system

Abstract

The invention discloses a double-planet-row multimode hybrid power automobile power transmission system. One end of a first planet carrier is in clutch connection with a second gear ring through a first clutch while the other end of the same is in clutch connection with a first gear ring through a second clutch, and a first sun gear is connected with a first power source through a first transmission shaft; one end of a second planet carrier is connected with a brake while the other end of the same is in clutch connection with the first gear ring through a third clutch, a second sun gear is connected with a second power source through a second transmission shaft, and the second gear ring is connected with a power output shaft through a speed reducing device; a controller is electrically connected with the first clutch, the second clutch, the third clutch, the brake and each power source. Three power division modes like input, combination and output respectively adapted to low speed, medium speed and high speed under E-CVT combination drive are realized through only two planet row driving devices, and running efficiency of the transmission system and fuel economy of a whole automobile can be improved in the whole running speed interval.

Description

technical field [0001] The invention relates to the field of automobile power transmission, in particular to a power transmission system of a double-planet row multi-mode hybrid electric vehicle. Background technique [0002] With the continuous aggravation of the energy crisis and the deterioration of the ecological environment, energy conservation and environmental protection have become two major themes that the international community has focused on. Governments of various countries have introduced relevant policies to encourage and promote the research and development of new energy vehicles. Among them, fuel cell vehicles and pure electric vehicles are difficult to popularize in the short term due to technical reasons. Therefore, as a transitional product, hybrid electric vehicles are getting more and more attention. As the most effective energy-saving vehicle solution at present, the powertrain system of hybrid electric vehicles includes series, parallel, series-para...

AI Technical Summary

Problems solved by technology

However, in the existing hybrid powertrain system based on the power split power coupling mechanism, in the E-CVT hybrid drive mode, if only the input split mode is used, it is only suitable for low-speed driving conditions, medium-high speed or high-speed driving conditions The transmission efficiency of the system decreases; if only the compound power split mode is used, it is suitable for medium and high speed driving conditions, and the system transmission efficiency will also decrease under low speed or high speed conditions; the system adopts the dual mode of input and compound power split, It has high transmission efficiency under low-speed and medium-high-speed conditions, but the efficiency will still decrease under high-speed conditions, which will reduce the fuel economy of the whole vehicle

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