Exhaust gas recirculation system and engine with same

Abstract

The invention discloses an exhaust gas recirculation system. The exhaust gas recirculation system comprises a cooler, wherein an exhaust gas inlet used for being connected with an exhaust manifold and a supercharger after-treatment device, a first exhaust gas outlet used for being connected with an intake manifold and a second exhaust gas outlet used for being connected with a supercharger are formed in a cooling channel of the cooler; and the second exhaust gas outlet is positioned at the downstream part of the flow direction of the first exhaust gas outlet, and a variable-runner switch valve is arranged between the second exhaust gas outlet and the first exhaust gas outlet. According to the exhaust gas recirculation system disclosed by the invention, parts are fewer, occupied space is small, assembly is simple, space in an engine is reduced, one cooler is arranged on the engine more easily, and the cost is low; besides, the second exhaust gas outlet used for being connected with the supercharger has a longer flow distance compared with the first exhaust gas outlet, so that higher heat dissipating power can be realized, and heat dissipating power is improved by prolonging the time of flowing, in the cooler, of the exhaust gas. The invention further discloses an engine comprising the exhaust gas recirculation system.

Description

technical field [0001] The present invention relates to the technical field of engine design, and more specifically relates to an exhaust gas recirculation system. Furthermore, the present invention also relates to an engine comprising the above exhaust gas recirculation system. Background technique [0002] With the increasingly stringent emission regulations and fuel consumption requirements, emission regulations have become the leading factor leading the technological progress of diesel engines. Controlling harmful substances in engine exhaust is becoming more and more important. The engine adopts EGR (Exhaust Gas Recirculation, exhaust gas recirculation system) technology, which can effectively control the combustion temperature and reduce the emission of nitrogen oxides. [0003] In the prior art, two coolers are usually used to cool the exhaust gas in the high-pressure exhaust gas recirculation and the low-pressure exhaust gas recirculation respectively. At different...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, two coolers are usually used to cool the exhaust gas in the high-pressure exhaust gas recirculation and the low-pressure exhaust gas recirculation respectively. At different stages of the engine's use, the exhaust gas is introduced from one side of the EGR cooler and fed from the other. Side export, cooling medium and exhaust gas flow in reverse, the cooling structure is single, and the function is single. In addition, because there are many parts in the engine, setting up two coolers will increase the difficulty of engine layout

Images