Exhaust gas recirculation system with asymmetric flow

Abstract

The invention discloses an exhaust gas recirculation system with asymmetric flow. The exhaust gas recirculation system comprises a symmetric turbocharger, wherein the symmetric turbocharger comprisesa turbine and a gas compressor; the turbine is provided with two flow channels, namely a first flow channel and a second flow channel; the second flow channel of the turbine communicates with a firstexhaust manifold; the first flow channel of the turbine communicates with a second exhaust manifold; the other ends of the first exhaust manifold and the second exhaust manifold communicate with a certain number of exhaust manifolds corresponding to an engine respectively; and an EGR pipeline is arranged between the first exhaust manifold and the gas inlet end of the engine. According to the exhaust gas recirculation system, the symmetric flow channel turbocharger is adopted, so that the effect of an asymmetric flow channel turbocharger is achieved, and a higher EGR rate is achieved; an EGR valve and the EGR pipeline are adopted to introduce a part of exhaust gas exhausted by the engine into the engine again, so that the EGR rate which is high enough is achieved, the emission of NOx can bereduced, and the deterioration of economy is reduced to a certain extent; and moreover, the exhaust gas recirculation system is convenient to manufacture and low in production and mounting cost, andthe using effect is greatly improved.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system, in particular to an exhaust gas recirculation system with a simple structure and an asymmetric flow rate capable of effectively increasing the EGR rate, which belongs to the technical field of engines. Background technique [0002] The exhaust gas recirculation system (EGR system) is one of the effective means for the engine to reduce NOx emissions; the EGR system introduces part of the exhaust gas from the engine to the engine intake pipe, so that part of the exhaust gas from the engine is mixed with fresh air into the intake port of the engine , the exhaust gas is reintroduced into the cylinder to participate in the combustion, which can reduce the oxygen concentration and maximum combustion temperature in the cylinder, and achieve the effect of reducing NOx. [0003] In order to ensure the EGR rate, the existing technology generally uses an exhaust throttle valve or an asymmetric supercha...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned asymmetric channel turbocharger can be used to ensure the EGR rate. The asymmetric channel turbocharger can obtain a sufficiently high EGR rate while reducing the deterioration of economy to a certain extent. , but the asymmetric supercharger is difficult to manufacture, the processing accuracy and consistency are very high, and the cost of mass production is very high

[0006] If the exhaust throttle valve is used, the fuel consumption of the engine will be significantly increased, which is effective for achieving a sufficiently high EGR rate, but the economy is too poor

Images