A dual-planetary row multi-mode hybrid electric vehicle power transmission system

Abstract

The invention discloses a double-planetary-line multi-mode hybrid vehicle power transmission system. A power input end of a first planetary carrier is connected with a first power source through a first transmission shaft; two power output ends are formed on the first planetary carrier; one power output end of the first planetary carrier forms driving connection with a second gear ring through a first clutch; the other power output end of the first planetary carrier forms driving connection with a first gear ring through a second clutch and forms coupling connection with a first planetary gear; a first sun gear is connected with a third power source through a third transmission shaft; a second planetary carrier forms coupling connection with a second planetary gear; a power input end of the second planetary carrier forms driving connection with the first gear ring through a third clutch; a power output end of the second planetary carrier is connected with a power output shaft through adecelerating device; a second sun gear is connected with a second power source through a second transmission shaft; and a second planet gear forms engaged driving with the second gear ring. Only by using two planetary line driving devices, the double-planetary-line multi-mode hybrid vehicle power transmission system adapts to input, composite and output power dividing modes at a low speed, a medium speed and a high speed under E-CVT hybrid driving so that the fuel economy of the whole vehicle is improved.

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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