Power transmission system of hybrid electric vehicle and hybrid electric vehicle

Abstract

The invention discloses a power transmission system of a hybrid vehicle and the hybrid vehicle. The power transmission system comprises a first planetary gear mechanism, a second planetary gear mechanism, a third planetary gear mechanism, an input member, an output member, a first motor, a second motor, a first clutch, a second clutch, a first brake and a second brake, wherein the input member isconnected to a third planet carrier, the output member is connected to a third gear ring, a first planet carrier is fixedly connected with a rotor of the first motor, a first sun gear is fixedly connected with a rotor of the second motor, the first clutch is connected between the first sun gear and a first brake, the second clutch is connected between the first sun gear and a second gear ring, thefirst planet carrier is connected with the first brake, one end of the second brake is connected with the second gear ring, the first planet carrier and a second sun gear are fixedly connected, a first gear ring and a third sun gear are fixedly connected, and a second planet carrier and a third gear ring are fixedly connected. According to the power transmission system, through reasonable layoutof planetary rows, various working modes are achieved, the performance of a gearbox system is improved, and higher transmission efficiency is further obtained.

Description

technical field [0001] The invention relates to the technical field of hybrid vehicles, in particular to a power transmission system of a hybrid vehicle and the hybrid vehicle. Background technique [0002] With the increasingly stringent environmental protection measures around the world, hybrid vehicles have become a focus of automobile research and development because of their energy-saving and low-emission characteristics. Under the current technical level and application conditions, the hybrid electric vehicle is the most industrialized and marketable model among the electric vehicles. A hybrid vehicle uses an internal combustion engine and an electric motor as a hybrid power source. It not only has the advantages of good fuel engine power, quick response and long working time, but also has the benefits of no pollution and low noise from the electric motor, achieving the best match between the engine and the electric motor. . [0003] At present, the driving system of...

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Problems solved by technology

In the series mode, there is no mechanical connection between the engine and the output shaft, which can realize the optimal control of the speed / torque, but all its energy needs to be transferred to the output shaft after two conversions between mechanical power and electric power, and the loss is relatively large ;Parallel transmission has high efficiency, but the mechanical connection between the engine and the output shaft cannot ensure that the engine is always in a better working area, and is usually used for medium and high speeds; the hybrid combination combines the advantages of series and parallel, which can not only realize the optimization of the engine control, and can achieve high-efficiency control at medium and high speeds, but the limit power requirements of the motor are high when the vehicle starts, and the efficiency is low

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