An internal combustion engine exhaust system with exhaust gas recirculation

Abstract

The invention discloses an internal combustion engine exhaust system with a waste gas recirculation function. The exhaust system comprises multiple engine cylinders, multiple exhaust manifolds, an EGRvalve, an EGR cooler, an air inlet manifold, a turbine, a supercharger air compressor, an intercooler and a middle-cooling air inlet pipe; the exhaust system is characterized in that the multiple engine cylinder are distributed in groups and are connected with the multiple exhaust manifolds respectively; the turbine is provided with multiple turbine volute chambers, and the turbine volute chambers communicate with a turbine impellers; the multiple exhaust manifolds enter the multiple corresponding turbine volute chambers respectively; and at least parts of the exhaust manifolds are connectedwith the EGR valve at the same time. The exhaust system has the beneficial effects that the arrangement of a three-runner supercharger volute and the exhaust manifolds are more beneficial to reducingthe interference when exhausting is carried out among all the cylinders; an exhaust pulse effect is utilized, so that the maintenance of the exhaust energy is facilitated; and the exhaust system further has the beneficial effects that the volute cavities with different cross sections are arranged in the three-runner supercharger volute, so that the volute non-symmetry degree with different gradients can be formed, and EGR rate optimization under different working conditions of the engine is facilitated.

Description

technical field [0001] The invention belongs to the technical field of turbocharged internal combustion engines, in particular to an exhaust system of an internal combustion engine with exhaust gas recirculation using an asymmetrical turbocharger. Background technique [0002] In order to meet the engine emission requirements, the engine is provided with the proper EGR rate through the asymmetric turbocharger, EGR valve and related exhaust system. [0003] The currently existing solution is mainly disclosed in the patent CN104508284 (A), that is, through the asymmetric dual-channel supercharger and the EGR valve, the EGR rate requirements under different working conditions of the engine are met by controlling the EGR valve. Its disadvantage is that when the asymmetry of the turbine volute is large, it is difficult to generate a large exhaust gas pressure, and the EGR rate requirement can only be met through a forced EGR valve. When the asymmetry is small, at high speed and ...

AI Technical Summary

Problems solved by technology

Its disadvantage is that when the asymmetry of the turbine volute is large, it is difficult to generate a large exhaust gas pressure, and the EGR rate requirement can only be met through a forced EGR valve

[0004] The main disadvantages of this solution are: 1) The three cylinders share a volute exhaust flow channel, which makes the exhaust energy dissipation among the cylinders more

2) The forced EGR valve directly bears high-temperature exhaust scour, which brings high thermal load and poor reliability

In addition, the forced EGR valve also brings exhaust energy loss

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