Engine start-stop controlling method in switching process of strong hybrid power operating modes of automobile

Abstract

The invention discloses an engine start-stop controlling method in the switching process of strong hybrid power operating modes of an automobile. The method comprises the following steps of: determining whether the current state meets the starting conditions of an engine according to the relative information acquired by a multi-energy controller, wherein the treatment on a battery pack state-of-charge (SOC) signal, an accelerator pedal signal and an automobile speed signal is controlled by a hysteresis loop; outputting moment relative to the rotating speed of the engine in the process of starting and stopping the engine by using a starting motor (a first motor); controlling an ignition coil relay of the engine by using the multi-energy controller so as to control the ignition time of the engine; and compensating the fluctuation of the moment output by a power system in the start-stop process of a generator by using a driving motor. The method of the invention has the advantages of realizing reliable, economic and efficient start-stop control over the engine, reducing the vibration in the start-stop process, improving the properties of the whole automobile, recovering kinetic energy in the stopping process of the engine in the stopping process and further improving the utilization ratio of the energy, along with simple and practicable implementation.

Description

technical field [0001] The invention relates to an engine start-stop control method of a strong hybrid electric vehicle, especially for realizing the start-stop control of a strong hybrid electric vehicle engine for switching between two working modes of pure electric and hybrid driving during vehicle operation, so as to improve the engine start-stop process. vibration. Background technique [0002] The hybrid drive system can be divided into three forms: mild hybrid, medium hybrid and strong hybrid according to the degree of mixing. In the two structural forms of light hybrid and medium hybrid, the motor cannot drive the vehicle alone, and there is no pure electric working mode. Strong hybrid electric vehicles can not only realize the pure electric working mode driven by the motor alone, but also realize the hybrid driving mode of the engine and the motor. During the operation of the vehicle, the start-stop control can be realized according to the set conditions. The vehic...

AI Technical Summary

Problems solved by technology

Traditional cars use starters to start the engine, the engine speed is low and fluctuates greatly, and the mixture in the cylinder is uneven, which makes the engine emission and fuel economy deteriorate during the starting process

[0004] Since 2005, a number of patents have been involved in this field. Among them, the publication number is CN1896492A, and the Chinese invention patent application published on January 17, 2007 discloses a "motor torque control method for hybrid vehicle starter engine". The control method is based on the function or graph relationship between the engine water temperature and the engine friction torque. Although the torque suitable for the current engine start can be determined, the calculation of the torque is complicated, and the start-stop control conditions cannot be given, and the vibration during the start-up process is not considered. The impact of the vehicle and the influence of the output torque change on the performance of the vehicle caused by the starting process

This system only focuses on the engine stop control of traditional vehicles, and is not suitable for the engine start and stop control during the mode switching process of hybrid vehicles. At the same time, the implementation of the scheme needs to control the engine cylinder, and the determination of the time-related torque is complicated and difficult. Therefore, the scheme It is quite difficult to implement

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