Dual-mode planetary hybrid system and its control system

Abstract

The invention relates to the field of a hybrid power vehicle, in particular to a double-mode planet series-parallel connecting system and a control system thereof. The double-mode planet series-parallel connecting system is characterized in that a torque sensor is connected between an output shaft of an engine and a planet row system in series, the torque sensor is connected with a whole vehicle controller, accurate torque Eng_Trq actually output by the engine can be obtained through the feedback of the torque sensor, and closed loop PI correction on the torque control of the engine is realized, i.e. (1) the situation that the torque output of the engine is enlarged when the torque is smaller than a target torque is realized; (2) the situation that when an actual torque is greater than the target torque, the engine stops outputting a target command, and a load of the engine is in reverse drawing is realized. When the double-mode planet series-parallel connecting system disclosed by the invention is used, analog quantity signals can be collected by the torque sensor in real time, a current actual torque value of the engine can be calculated by the whole vehicle controller according to the obtained analog quantity signals, accurate closed loop control on the engine can be realized through control strategy calculation, and thus the problem that working points of the engine of the planet row system cannot be accurately controlled is solved.

Description

technical field

[0001] The invention relates to the field of hybrid vehicles, in particular to a dual-mode planetary hybrid system and a control system thereof. Background technique

[0002] In the field of hybrid electric vehicles, series connection can realize the optimal control of the engine, but all the energy will be converted twice, and the loss is relatively large; parallel connection can achieve better transmission efficiency, but the mechanical connection between the engine and the output shaft cannot ensure that the engine is always It is in a better working area; therefore, the hybrid power system is a better choice. The current hybrid power system mainly uses a planetary mechanism as a power splitting device. The advantage of the planetary row system is that it can realize the decoupling between the engine speed and the output shaft speed. The control system can control the speed and torque of the engine at any vehicle speed, so as to realize the high-efficienc...

Images