Cold start control method, device and electronic control unit

Abstract

The invention provides a cold start control method, device and electronic control unit. The method includes: when it is detected that the engine performs a cold start, acquiring engine parameters and intake air heating relay parameters; Setting overheat protection conditions and judging whether the parameters of the intake air heating relay meet the second preset overheating protection conditions; if the engine parameters meet the first preset overheating protection conditions and the parameters of the intake air heating relay meet the second preset overheating protection conditions protection conditions, set the preset overheat protection coefficient as the preset protection value, so that the overheat protection device stops the overheat protection operation according to the preset overheat protection coefficient set as the preset protection value, effectively avoiding the heating of the intake air heating grid. As a result, the intake air temperature is too high, so that the overheat protection operation is performed and the engine is shut down.

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 air heating grid to preheat the gas in the intake pipe. After a long time of preheating, the temperature of the intake air heating grid will exceed 500 °C, and the temperature in the intake pipe measured by the sensor will be higher than 500°C. The gas temperature, ie the intake air temperature, will also be very high. [0003] In the prior art, in order to avoid damage to the engine due to the high intake air temperature, an overheat 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. Limit the engine oil to stop the engine to protect...

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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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