Method for starting engine and starting control device

Abstract

The present invention provides an engine startup method and a controller thereof. The method utilizes an electric motor to drive an engine to start up; the method also detects the rotation speed of the engine; wherein, when the rotation speed of the engine reaches a first rotation speed and the duration of the rotation speed lasts until a first duration, the fuel injection quantity for the startup of the engine is controlled as L; when the rotation speed of the engine reaches a second rotation speed and the duration of the rotation speed lasts until a second duration, the fuel injection quantity for the startup of the engine is controlled as the first corrected value of L; and when the rotation speed of the engine reaches a third rotation speed and the duration of the rotation speed lastsuntil a third duration, the fuel injection quantity for the startup of the engine is controlled as the second corrected value of L. The adoption of the method and the controller can shorten startup time, in particular cold startup time, improve the startup quality of the engine, decrease the fuel consumption of startup and reduce startup emission.

Description

technical field [0001] The invention relates to an engine starting method and a starting control device. Background technique [0002] In traditional fuel vehicles, the engine is started by the starter. When the engine is driven to a certain speed, the electronic control unit (ECU) judges the cylinder, and combines the coolant temperature to obtain the fuel injection volume and ignition pulse width. , and then carry out fuel injection ignition. However, when the engine is started, especially when the engine is cold, because the coolant temperature is low and the fuel atomization effect is poor, the fuel injection quantity has to be enriched, resulting in wet walls and insufficient combustion, which not only increases fuel consumption but also worsens emissions At the same time, when the engine is started from a cold engine, the friction force between the various parts of the engine is relatively large, and the torque generated by the starter function is limited, resulting i...

AI Technical Summary

Problems solved by technology

[0005] In order to meet the needs of hybrid vehicles that require the engine to start and stop at any time, and to solve the problems of long start-up time, high fuel consumption and poor start-up quality that may be caused by applying the start-up method of the existing fuel vehicle, the present invention provides an engine start-up method. The method includes using an electric motor to drive the engine to start, and the method also includes detecting the rotation speed of the engine, wherein when the rotation speed of the engine reaches a first rotation speed and the time for stabilizing at the rotation speed lasts for a first duration, the start-up fuel injection quantity of the engine is controlled is L; when the rotational speed of the engine reaches the second rotational speed and the time for stabilizing on this rotational speed lasts for the second duration, the starting fuel injection quantity of the control engine is the first correction value of L; when the rotational speed of the engine reaches the third rotational speed and When the time stabilized at this rotational speed lasts for a third duration, the start-up fuel injection quantity of the engine is controlled to be the second correction value of L; wherein, the first rotational speed

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