Device and method for rapidly pre-warming air-intake of gasoline engine cold-start

Abstract

The invention relates to a device for gasoline engine cold start to realize a quick preheating gas intake and a method thereof. The device comprises a petrol supply and a jet unit, a gas intake unit of a preheating device, an igniter electrode, a combustion chamber, a heat exchanger device, an enclosure, a temperature sensor and an electric control unit. The method is divided into the following steps. The temperature T of an intake tube is obtained before starting; then T is compared with a preset value T1, and when T is not less than T1, the engine starts in normal mode. When T is less than T1, the engine is started and then lasts for three seconds before igniting and an electromagnetic valve is opened, start; five seconds later, the engine is ignited and heats the intake gas and the temperature T of the intake tube is obtained; T then is compared with a preset value T2, and when T is not less than T2, the petrol jet to the combustion chamber is stopped and the engine is started; when T is less than T2, petrol is continuously supplied to the combustion chamber till T is not less than T2.

Description

technical field [0001] The invention relates to a device and a method for realizing rapid preheating of intake air at a cold start of a gasoline engine, and belongs to the technology of reducing emission at a cold start of a gasoline engine. Background technique [0002] In the emission cycle test, according to the US Environmental Protection Agency's federal government test procedures, nearly 80% of the HC and CO emissions of a gasoline engine equipped with a three-way catalytic converter are generated in the first few minutes of cold start. The high emission of gasoline engine cold start causes serious pollution of ambient air quality. Therefore, it is of great significance to reduce cold start emissions of gasoline engines. [0003] Air intake preheating is one of the effective measures to effectively reduce cold start emissions of gasoline engines. There are two types of air intake preheating: centralized preheating and cylinder-specific preheating. The centralized pr...

AI Technical Summary

Problems solved by technology

And all three kinds of preheating devices are used for gasoline engine air intake preheating and all have certain defects.

First of all, the three consume a lot of power, which will inevitably increase the consumption of the battery and cause the power of the battery itself to drop, which is very unfavorable to cold starting, affecting its life and even causing starting failure, which directly leads to an increase in cold starting emissions, especially at low temperatures. in this way

Secondly, both the electric heater and the electric flame preheater are locally heated, and the intake air temperature is not only heated unevenly but also drops after the engine is started.

In addition, the electric flame preheater uses diesel fuel, which is inconvenient to use on gasoline engines

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