Control method, device and equipment for engine starting

Abstract

The invention relates to a control method, device and equipment for engine starting. The method comprises steps as follows: when a starting request is received, current electric quantity of a batteryis acquired; whether the current electric quantity is larger than a first preset electric quantity threshold or not is judged; if the current electric quantity is larger than the first preset electricquantity threshold, temperature of a catalyst is acquired; whether the temperature of the catalyst is smaller than a first preset temperature threshold or not is judged; if the temperature of the catalyst is not smaller than the first preset temperature threshold, the engine is driven to rotate forwards to carry out fuel cut-off starting; if the temperature of the catalyst is smaller than the first preset temperature threshold, a heating tray is preheated; the engine is driven to rotate reversely, and the engine is heated through heat of the heating tray; after the engine is heated, the catalyst is heated; and when the temperature of the catalyst reaches the first preset temperature threshold, the engine is driven to rotate forwards to carry out fuel cut-off starting. According to the control method, device and equipment for the engine starting, fuel consumption and waste gas emission can be reduced, and the starting time can be shortened.

Description

technical field [0001] The invention relates to the technical field of engines, 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 the engine start-up emissions. Researchers have found that by increasing electric heating, using The three-way catalytic converter in the starting stage is heated to reduce the emission during the starting 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 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 te...

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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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