Lean burn engine and automobile

Abstract

The invention belongs to the technical field of engines, and relates to a lean burn engine and an automobile. The lean burn engine comprises a water spraying system and an electric control unit, wherein the water spraying system comprises air flue water sprayers, pressure sensors and a water supply device; the air flue water sprayers are connected with the water supply device through water pipes;the pressure sensors are used for detecting the pressure values of the water pipes and sending the pressure values to the electric control unit; the air flue water sprayers are arranged on air inlet channels of air cylinders of the engine and spray water to the air inlet channels; the electric control unit is in signal connection with the air flue water sprayers and the pressure sensors; and whenthe engine is in different work conditions, the pressure values of the water pipes change, the pressure sensors send corresponding signals to the electric control unit according to the different pressure values of the water pipes, and the electric control unit controls the air flue water sprayers to adjust the water spraying amount. According to the lean burn engine, the electric control unit controls the air flue water sprayers to adjust the water spraying amount according to different engine work conditions (loads), and efficient clean combustion of the engine is achieved.

Description

technical field [0001] The invention belongs to the technical field of engine lean combustion, and in particular relates to a lean combustion engine and an automobile. Background technique [0002] With the implementation of the fourth stage of fuel consumption standards for passenger cars, improving the thermal efficiency of internal combustion engines and reducing fuel consumption has become a top priority for the automotive industry. [0003] Supercharging miniaturization technology is considered to be an important means to reduce engine fuel consumption. The throttle opening of supercharged miniaturized engine is larger at partial load, which is beneficial to reduce throttling loss and pumping loss, but the high intake pressure caused by supercharging at high load increases the tendency of knocking. [0004] In order to further improve the thermal efficiency of the engine, dilution combustion is the preferred method, including air dilution (lean combustion) and exhaust ...

AI Technical Summary

Problems solved by technology

However, the effect of lean burn on knock suppression is worse than that of EGR, resulting in large exhaust loss after the combustion phase. At the same time, lean burn leads to a significant increase in the minimum ignition energy of the spark plug, and the excess combustion air coefficient is greater than 1, which makes the traditional three-way catalytic converter TWC unable To effectively control NOx emissions, it is necessary to reduce the amount of NOx produced in the cylinder by optimizing combustion or develop high-efficiency after-treatment technology to control exhaust NOx emissions

[0006] In addition, the existing lean combustion technology generally has problems such as low dilution limit, combustion phase difference and difficulty in controlling NOx emissions.

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