Control method of cold start of hybrid power system

Abstract

The invention discloses a control method of cold start of a hybrid power system, wherein, an electric machine participates in starting an engine if the water temperature of the engine is higher than the presupposed threshold value of water temperature, the sate of charge of high pressure battery is higher than the presupposed threshold value of a first sate of charge and the available discharge power of high pressure battery is higher than the presupposed threshold value of a first available discharge power; otherwise, a starter starts the engine solely. The invention adopts the cold-start control method of the hybrid power system to start the engine, and if conditions are allowable, the electrical machine and the starter can be used jointly to start the engine, thereby increasing the torque when the engine starts; moreover, the smaller overshoot of the engine enables that the engine starts more smoothly, which is able to effectively lessen the vibration and noise in the process that the engine starts, decrease emission and oil consumption, reduce pollution and save energy.

Description

technical field [0001] The invention relates to a hybrid power system, in particular to a cold start control method of the hybrid power system. Background technique [0002] With the increasing shortage of energy and the increasing environmental pollution, many automobile manufacturers have begun to vigorously develop new energy vehicles. Among many new energy vehicle solutions, the technical solutions of hybrid vehicles have been widely used in many models at home and abroad. like figure 1 As shown, the starting system of the engine in a traditional internal combustion engine vehicle is generally made up of a motor 12 and a 12V low-voltage battery 11, and the starter 12 directly starts the engine 13. When the driver turns the car key to start the car, the starter drives the engine to rotate to start the car. But in the process of starting the engine, due to the large overshoot of the engine, the engine often has a large vibration and noise during the starting process, an...

AI Technical Summary

Problems solved by technology

But in the process of starting the engine, due to the large overshoot of the engine, the engine often has a large vibration and noise during the starting process, and its emission and fuel consumption are relatively large at the moment of starting the engine, which is easy to pollute the environment and waste of energy

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