Air feeding system of four-cylinder engine

Abstract

The invention discloses an air feeding system of a four-cylinder engine. The air feeding system of the four-cylinder engine comprises four air cylinder cover air feeding channels, an air feeding pipe,an air feeding connection pipe and an EGR branch, wherein the four air cylinder cover air feeding channels are all right-handed spiral air feeding channels; the air feeding pipe adopts layered designand comprises a lower-layer air feeding pipe and an upper-layer air feeding pipe, one end of the lower-layer air feeding pipe is sealed, the side surfaces of the lower-layer air feeding pipe is provided with four air feeding channel connectors which communicate with the inlets of the four air cylinder cover air feeding channels, one end of the upper-layer air feeding pipe communicates with the other end of the lower-layer air feeding pipe, and the other end of the upper-layer air feeding pipe is provided with an air feeding connector; and one end of the air feeding connection pipe communicates with the air feeding connector of the air feeding pipe, and the side surface of the air feeding connection pipe is provided with an EGR connector. The air feeding system of the four-cylinder engineadopts layered design, EGR waste gas enters from the air feeding pipe, so that the mixing path of the EGR waste gas and fresh air is prolonged, and the mixing effect is more sufficient.

Description

technical field [0001] The invention relates to the field of engines, in particular to an air intake system of a four-cylinder engine. Background technique [0002] In order to make the diesel engine have a lower emission effect and meet the strict emission regulations, the diesel engine body often needs to add an EGR (exhaust gas recirculation) system. After adding the EGR system, the exhaust gas must be fully mixed with fresh air in order to achieve a better effect of reducing emissions. [0003] There are following deficiencies in existing technical solutions: [0004] 1. The four-cylinder engine is too compact in structure and the length of the intake pipe is short, so it is difficult to achieve an ideal mixing effect of EGR exhaust gas and fresh intake air. [0005] 2. The intake port of the intake pipe of the four-cylinder engine is set at both ends of the intake pipe, which can achieve good uniformity of the intake air flow of each cylinder, but this structure has p...

AI Technical Summary

Problems solved by technology

[0004] 1. Four-cylinder engine, the structure is too compact, the length of the intake pipe is short, it is difficult to achieve the ideal mixing effect of EGR exhaust gas and fresh intake air

[0005] 2. The intake port of the intake pipe of the four-cylinder engine is set at both ends of the intake pipe, which can achieve good uniformity of the intake air flow of each cylinder, but this structure has poor adaptability when matching the whole vehicle question

Similarly, the air intake of the air intake pipe is set in the middle of the air intake pipe, and the vehicle fit is better, but the uniformity of the air intake flow of each cylinder is not good.

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