Control method, device and device for starting an engine

Abstract

The present invention relates to a control method, device and device for starting an engine. The method includes: when a start request is received, obtaining the current power of a battery; judging whether the current power is greater than a first preset power threshold; The current power is greater than the first preset power threshold, and the temperature of the catalyst is obtained; it is judged whether the temperature of the catalyst is less than the first preset temperature threshold; if the temperature of the catalyst is not less than the first preset temperature threshold, The engine is driven to rotate forward for fuel-cut start; if the temperature of the catalyst is lower than the first preset temperature threshold, the heating plate is preheated; the engine is driven to reverse, and the engine is heated by the heat of the heating plate; When the heating of the engine is completed, the catalytic converter is heated; when the temperature of the catalytic converter reaches the first preset temperature threshold, the engine is driven to rotate forward for fuel-cut start; the present invention can reduce fuel consumption and exhaust emission, and shorten the start-up time.

Description

technical field [0001] The present invention relates to the technical field of engines, and in particular, to a control method, device and equipment for starting an engine. Background technique [0002] With the increasingly serious environmental pollution and stricter emission regulations, many car manufacturers focus on reducing exhaust emissions. In order to reduce exhaust emissions, it is necessary to improve engine start-up emissions. The researchers found that by increasing electric heating, the use of The three-way catalytic converter in the start-up stage is heated to reduce the emission at the start-up stage. [0003] The conversion efficiency of the three-way catalytic converter is determined by its own temperature. When the temperature of the three-way catalytic converter is low, its conversion efficiency is almost 0; when its temperature reaches the light-off temperature, generally around 250 °C, its conversion The efficiency can reach up to 50%; when its temper...

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Problems solved by technology

[0003] The conversion efficiency of the three-way catalytic converter is determined by its own temperature. When the temperature of the three-way catalytic converter is low, its conversion efficiency is almost zero; when its temperature reaches the light-off temperature, generally around 250°C, its conversion efficiency The efficiency can reach up to 50%; when its temperature reaches about 600°C, its conversion efficiency can reach up to 95%; on vehicles without electric heating plates, the exhaust gas of the internal combustion engine is usually used to heat the catalyst, which will cause the internal combustion engine to Produces higher emissions during start-up

[0006] 1): Since the temperature of the internal combustion engine does not rise, the internal combustion engine must go through the starting and warming up conditions, and these two conditions need to be enriched

Enrichment will increase the raw emissions of the internal combustion engine;

[0007] 2): The exhaust pipe at the front end of the catalytic converter is not heated, the oxygen sensor does not exceed the dew point during cold start, the lambda closed-loop intervention is late, and the emission consistency from the start to the closed-loop stage is poor;

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