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 includes a water spray system and an electronic control unit; the water spray system includes an air passage sprinkler, a pressure sensor and a water supply device, and the air passage sprinkler It is connected to the water supply device through a water pipe, and the pressure sensor is used to detect the pressure value of the water pipe and send it to the electronic control unit. The sprinkler is connected to the pressure sensor signal. When the engine is in different working conditions, the pressure value of the water pipe changes, and the pressure sensor sends corresponding signals to the electronic control unit according to the different pressure values ​​of the water pipe, and the electronic control unit controls the airway sprinkler. Adjust the amount of water spray. In the lean-burn engine of the present application, the electronic control unit controls the airway water injector to adjust the water injection amount according to different engine working conditions (loads), so as to realize efficient and clean combustion of the engine.

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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