Engine control method and system for hybrid vehicle and hybrid vehicle

Abstract

The invention discloses an engine control method of a hybrid vehicle, an engine control system of the hybrid vehicle and the hybrid vehicle, wherein the method comprises the following steps that: when the hybrid vehicle enters a series mode from a pure electric mode, an ISG (Integrated Starter Generator) is controlled to enter a torque control mode, and an engine is dragged by a preset torque; when the rotating speed of the engine reaches the preset rotating speed, the ISG is controlled to enter a rotating speed control mode, so that the ISG is controlled; and after the preset time is over, the engine is controlled to spray oil until the input torque of the engine reaches the target torque, and the starting of the engine is completed. The control method provided by the embodiment of the invention has the advantages that the vehicle starting and stopping performance can be improved, so that the starting of the engine is smooth; the torque switching of the engine and the motor are smooth after the starting succeeds; energy sources are saved; and the use experience of users is improved.

Description

technical field [0001] The present invention relates to the technical field of vehicles, and in particular, to an engine control method and system of a hybrid vehicle, and a hybrid vehicle. Background technique [0002] In the related art, the start-stop control method of the engine is relatively simple. For example, the vehicle controller sends the engine start flag, so that the engine starts to supply fuel, and at the same time, the motor enters the speed control mode, and the vehicle controller directly sends a signal to the motor at the same time. The speed value is fixed, so that the motor uses PID (Proportion Integration Difference) to control the motor to drag the torque to drag the engine to start. [0003] However, the disadvantages of the start-stop control method of the engine in the related art are: 1) Once the motor drag torque is too large, it is easy to generate overvoltage of the busbar, and at the same time, it is easy to cause the overshoot of the engine, w...

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of the start-stop control method of the engine in the related art are: 1) Once the motor drag torque is too large, it is easy to generate busbar overvoltage, and at the same time, it is easy to cause overshoot of the engine, resulting in increased energy consumption of the system and waste of energy; 2) ) Once the fuel injection time of the engine is too early, it will easily lead to unstable combustion of the engine, thereby reducing the start-stop performance of the vehicle, and at the same time, it is not conducive to the fuel consumption of the engine, and the reliability of engine start cannot be well guaranteed

Images