Three-mode power transmission device for hybrid vehicle

Abstract

The invention relates to a three-mode mechanical-electric compound speed changing device. The device is provided with three planetary gear groups, two power-driven / electricity-generating machines and a plurality of torque transmission mechanisms. Two motors with a 'power-driven / electricity-generating' mode are arranged on the device; a system output rotation speed can be continuously changed in three sections through the matching between continuous switching of 'power-driven / electricity-generating' states of the two motors and a mechanical speed changing device, on the premise that a system input rotation speed is not changed; and then a stepless speed changing device function is realized. During a complete working period of mechanical-electric compound drive, the two motors pass through three sections of working states respectively, so a very wide continuous stepless speed-regulating range of a system is converted into three-time recirculation of the motor rotation speed in a limited range, and the requirements on the rotation speed and the power of the motors are greatly reduced. At the same time, the device has very wide continuous stepless speed-regulating ability, so an engine can be stabilized in one rotation speed state all the time theoretically and the working state of the engine can be well optimized. The device is particularly applicable to hybrid electric vehicles with large tonnage and heavy load.

Description

technical field [0001] The invention relates to a vehicle transmission device, in particular to a hybrid vehicle, especially a three-mode power transmission device for a large-tonnage, heavy-duty hybrid vehicle. Background technique [0002] At present, most of the advanced hybrid vehicles use a hybrid power transmission device, with the planetary gear train as the power connection mechanism, the engine outputs power to a certain component of the planetary gear train, and the planetary gear train distributes the torque to the generator in a fixed proportion. The electric motor converts electrical energy into mechanical energy, which is superimposed with the torque of the output shaft for power output. Due to the adoption of the planetary gear system, the generator speed can be adjusted by controlling the power generation of the generator when the vehicle speed changes, thereby stabilizing the engine speed and optimizing the working state of the engine; it can also expand the...

AI Technical Summary

Problems solved by technology

[0005] The "multi-mode" transmissions disclosed in Chinese patents CN200710078131.1 and CN200710078132.6 are essentially a variety of working modes for hybrid vehicles, rather than expanding the transmission range through motor mode conversion, and the existing multi-mode transmissions have the same structure Relatively complex, the structure of the three-mode power transmission device of the present invention is more concise and compact. After searching domestic and foreign patents, no structural scheme identical to that of the present invention has been found

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