Cold start control method and device and electronic control unit

Abstract

The invention provides a cold start control method and device and an electronic control unit. The method comprises the following steps that when the cold start of an engine is detected, an engine parameter and an air inlet heating relay parameter are acquired; whether the engine parameter meets a first preset overheating protection condition or not is judged, and whether the air inlet heating relay parameter meets a second preset overheating protection condition or not is judged; if the engine parameter meets the first preset overheating protection condition and the air inlet heating relay parameter meets the second preset overheating protection condition, a preset overheating protection coefficient is set to be a preset protection value, so that an overheating protection device stops performing overheating protection operation according to the preset overheating protection coefficient set to be the preset protection value. According to the method and device and the unit, the situationthat the intake air temperature is too high due to heating of an air inlet heating grid, so that the overheating protection operation is performed, and then the engine flameout is generated is effectively avoided.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of vehicles, and in particular to a cold start control method, device and electronic control unit. Background technique [0002] When the engine is cold-started, it is necessary to use the intake heating grid to preheat the gas in the intake pipe. After a long time of warm-up, the temperature of the intake heating grid will exceed 500°C. The temperature in the intake pipe measured by the sensor The gas temperature, i.e. the intake air temperature, can also be very high. [0003] In the prior art, in order to avoid damage to the engine due to excessively high intake air temperature, an overheating protection mechanism is required, that is, after it is determined that the intake air temperature measured by the sensor exceeds the preset temperature limit, the corresponding protection function is activated to Oil restriction is performed on the engine so that the engine stalls and thus pro...

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Problems solved by technology

[0004] However, the inventor found that at least the following problems exist in the prior art: when the sensor is installed close to the intake heating grid, the temperature measured by the sensor has exceeded the preset temperature limit due to the high temperature of the intake heating grid value, but the actual gas temperature in the intake pipe may not exceed the preset temperature limit, and the overheating protection mechanism will still be activated at this time, causing the engine to stall and cause the engine to fail to start

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