A transmission for a front-drive plug-in hybrid vehicle

Abstract

The invention provides a transmission device for a front-drive plug-in hybrid vehicle. The transmission device for the front-drive plug-in hybrid vehicle comprises a small motor (EM1), a big motor (EM2), a planetary gear power coupling mechanism and a double reduction gear train and is provided with a first brake (B1), a second brake (B2), a first clutch (C0), a second clutch (C1) and a third clutch (C2) to realize a plurality of pure electric driving modes and a hybrid driving modes, wherein the planetary gear power coupling mechanism consists of two single planetary gear rows. During pure electric driving, the clutch C0 is opened to be separated from an engine and the brake B1 and the brake B2 are controlled to be closed or opened to realize the pure electric driving mode with three gears. When the clutch C0 is closed, the engine participates in working to enter the hybrid driving mode, and B1, B2, C1 and C2 are controlled in a coordinated way to realize a hybrid driving mode with a plurality of fixed rotation ratios and a power shunting driving mode with a plurality of fixed rotation ratios. The invention has the advantages of high transmission efficiency, high torque output performance and the like and is suitable for power coupling and transmission of the plug-in hybrid vehicle.

Description

technical field [0001] The invention relates to a transmission device for automobiles, in particular to a transmission device for a front-drive plug-in hybrid vehicle. Background technique [0002] In order to deal with energy security, air pollution and other issues, major automobile companies are actively taking countermeasures, mainly focusing on the improvement of internal combustion engine systems and the development of new energy drive systems. The technically mature hybrid power system and the plug-in hybrid power system developed on this basis have become feasible technical solutions to solve automobile energy consumption and environmental pollution at this stage, and have broad market prospects. [0003] At present, the hybrid systems that have been mass-produced are all deep hybrid systems. The representative product is the first single-planetary hybrid model PRIUS launched by Toyota in 1997. This model uses a planetary gear mechanism as a power coupling device, w...

AI Technical Summary

Problems solved by technology

However, for the plug-in hybrid system that focuses more on pure electric driving, this solution still has certain shortcomings.

For example, the torque of the engine needs to be balanced by a small motor connected to the sun gear, that is, increasing the engine requires increasing the torque requirement of the small motor. The structural characteristics of this system limit its matching ability

During pure electric driving, the system can only realize the pure electric mode of a single gear, and cannot optimize the working state of the motor

Therefore, when the Toyota system is used in a plug-in hybrid system, there is still a lot of room for improvement.

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