Hybrid vehicle and engine starting method and device thereof

Abstract

The invention provides a hybrid vehicle and an engine starting method and device thereof. The method comprises the steps that a BSG motor is started; whether the vehicle control unit receives a starting instruction of an engine within a preset time period or not is judged; when the vehicle control unit receives the starting instruction within the preset time period, the vehicle control unit sends a starting torque to the BSG motor; the BSG motor increases the output torque of the BSG motor according to a first preset torque rate by taking the starting torque as a target; and the output torque of the BSG motor is controlled according to the rotating speed of the engine to start the engine. According to the method and the device, when the hybrid vehicle adopts the BSG motor to start the engine, the starting state of the engine is judged by judging whether the rotating speed of the engine meets the corresponding requirements or not in the corresponding stage, and then the output torque of the BSG motor is controlled to start the engine; the use efficiency of the BSG motor is improved, the starting success rate of the engine is increased, and oil consumption and emission of the hybrid vehicle are reduced.

Description

technical field [0001] The present invention relates to the field of hybrid vehicles, and more particularly to the control of hybrid vehicles. Background technique [0002] As fuel consumption regulations become more and more stringent, reducing fuel consumption has become the top priority of research and development for all automakers. Among these technologies, rapid start-stop technology is recognized as one of the easiest technologies for mass production because of its acceptable cost and high fuel saving rate. The engine starting method of the existing hybrid vehicle generally determines the fuel injection time of the engine according to the temperature of the coolant; the motor is started, and the engine is driven backward by the motor; when the fuel injection time is reached, the engine fuel injection command is sent to control the engine. Carry out fuel injection operation, thereby reducing the fuel consumption during the engine starting process; or filter out the lo...

AI Technical Summary

Problems solved by technology

[0003] However, these methods do not have a judging mechanism for the success or failure of the engine after starting the engine. If the start is unsuccessful, the BSG motor will always drag the engine to start, which will not only cause waste of fuel consumption, low start-up efficiency, but also cause damage to the BSG motor. even engine damage

Moreover, when the engine reaches a certain speed, it will automatically control the fuel injection and ignition, and there is no need to start the BSG motor at the full speed range, which further causes waste of fuel consumption.

In addition, the viscosity of the engine lubricating oil is different under different coolant temperatures, that is, at different temperatures, the engine needs different BSG starting torques. The above-mentioned existing methods do not determine the starting torque of the BSG through the coolant temperature, reducing the Improve the use efficiency of BSG motor

[0004] Therefore, the hybrid vehicle in the prior art has the problems of being unable to judge the result of starting the engine, the use efficiency of the BSG motor, the starting efficiency being low, and the fuel consumption being large

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