Engine cold start control method and device

Abstract

Embodiments of the present invention provide a method and device for controlling engine cold start. The method includes: if the ambient temperature sensor does not work normally and is not associated with a fault degradation mechanism, when the engine speed reaches a preset speed threshold during the start-up process, obtain The air flow of the intake pipe of the engine; obtain the air mass in the intake pipe according to the air flow, and determine the first air density in the intake pipe of the engine according to the air mass and the volume of the intake pipe of the engine; obtain the ambient pressure value at the same time, and according to Acquire the corresponding ambient temperature value for the error code of the sensor signal; determine the second air density of the external environment of the engine according to the ambient pressure value and the ambient temperature value; In the starting state, it can continue to control whether the engine enters the cold start state when the ambient temperature sensor is missing, and the cost is low and the reliability is high.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of engine control, and in particular, to a method and device for controlling engine cold start. Background technique [0002] Generally, it is difficult to start the engine cold, because the ambient temperature is very low, especially when the fuel is diesel, the internal temperature of the engine is too low, and the fuel is not easy to vaporize. In addition, the lubricating oil inside the engine may be in a solidified or precipitated state during a cold start, resulting in poor lubrication of individual parts. [0003] The threshold value of the speed synchronization signal corresponding to normal temperature start and cold start is different. Entering a cold start at room temperature will reduce the threshold value of the speed synchronization signal. At this time, there are many interference signals, which will cause difficulty in starting. [0004] At present, the starting ambient ...

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Problems solved by technology

[0006] Embodiments of the present invention provide an engine cold start control method and equipment to solve the problem of the ambient temperature obtained by looking up the default voltage value of the ambient temperature sensor if the engine ambient temperature sensor is missing or damaged when the ECU is not equipped with a fault downgrading mechanism. The value is low, so that the engine enters the cold start condition in the normal temperature environment, causing the problem that the engine is difficult to start

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