Exhaust gas recirculation system and automobile

Abstract

The invention provides an exhaust gas recirculation system and an automobile. The system comprises a pre-stage catalyst converter, a cooler connected with an exhaust gas outlet of the pre-stage catalyst converter, an exhaust gas recirculation valve connected with the cooler, a throttling valve, a pre-mixing pressure stabilizing cavity, a gas compressor and an intercooler. Outside air enters the system through the throttling valve. Exhaust gas entering from the exhaust gas recirculation valve and the outside air entering from the throttling valve are mixed in the pre-mixing cavity, and mixed gas is formed. The gas compressor is connected with the pre-mixing pressure stabilizing cavity. The intercooler is connected with the gas compressor. After the mixed gas is compressed, the mixed gas enters an engine through the intercooler. According to the exhaust gas recirculation system, the waste gas and fresh air can be sufficiently mixed evenly with the enough pressurizing pressure, the low air inlet temperature can still be kept under the condition of the high EGR flow, and meanwhile the EGR rate is accurately controlled. By means of the system, the fuel economy can be improved, emission can be reduced, the performance of the original engine cannot be reduced, and the exhaust gas recirculation system is very suitable for air flue jet pressurizing gasoline engines.

Description

technical field [0001] The invention relates to the field of automobile engines, in particular to an exhaust gas recirculation system and an automobile. Background technique [0002] In recent years, in order to meet the requirements of increasingly stringent environmental emission regulations, supercharged gasoline engines have gradually become a technology trend. For port injection supercharged gasoline engines, the introduction of EGR (exhaust gas recirculation) can reduce knocking tendency, improve combustion efficiency, increase charging efficiency and reduce pumping loss, thereby improving fuel economy. It effectively reduces the emissions of nitrogen oxides and carbon oxides, so that the port injection supercharged gasoline engine has fuel economy that is not inferior to the direct injection supercharged gasoline engine, and can effectively avoid the direct injection gasoline engine in the cylinder. Risk of difficult particle emission control after VI emission regula...

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Problems solved by technology

[0004] In order to overcome the problems of low EGR rate, uneven mixing of exhaust gas and fresh air, poor control accuracy, and performance degradation of the supercharged gasoline engine introduced into the system in the prior art, the present invention provides an exhaust gas recirculation system and an automobile

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