A control method for a dual-axle parallel hybrid electric city bus

Abstract

The invention discloses a method for controlling a double-shaft parallel hybrid power urban bus. The method comprises the following steps that a power transmission system model is set up; linear fitting is carried out; the reachable area of a state of charge (SOC) is pre-determined; a prediction control model is set up; a hybrid integral linear programming problem is solved. According to division of the work modes and the dynamic characteristic of hybrid logic, the work modes of the hybrid power bus can be freely switched according to running conditions and the behavior of a driver, and therefore torque is distributed to an engine and a motor through an optimal method. The problem that due to a control method based on rules, torque distribution cannot be automatically optimized according to the running conditions is effectively solved. The defect that only the current moment can be considered in instantaneous optimization is effectively overcome through the prediction model. When the range of visibility is predicted, duration enabling the relative error of the prediction result and an ideal value to be small can be found according to experiments, and the strict requirement for the whole running conditions in global optimization is effectively eliminated.

Description

technical field [0001] The invention relates to an energy control strategy of a dual-axle parallel hybrid electric bus, in particular to a control method for a dual-axle parallel hybrid electric city bus. Background technique [0002] At present, the development of new energy vehicles with the goal of energy saving and environmental protection has become the consensus of all countries in the world. Hybrid vehicles are the first mass-produced new energy vehicles. Existing hybrid electric vehicles generally use the traditional internal combustion engine as the main power source, and the battery motor system as the auxiliary power source. The engine works in a high-efficiency area through an optimized control system, and regenerative braking energy recovery is realized, which is different from traditional liquid fuels. Compared with automobiles, it greatly improves fuel economy and reduces pollutant emissions. Therefore, under the current conditions, hybrid vehicles have beco...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome some problems existing in the existing hybrid electric bus, the present invention proposes a double-axle motor that does not need to know the entire driving condition accurately, and can efficiently cooperate the motor and the engine so as to improve the fuel economy of the hybrid electric bus. Control method of parallel hybrid electric bus

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