Supercharged engine exhaust manifold

Abstract

The invention relates to a supercharged engine exhaust manifold. A first convergence part exists between the lower part of a first exhaust manifold and the lower part of a second exhaust manifold of the exhaust manifold, and the first exhaust manifold and the second exhaust manifold are merged into a first merging part below the first convergence part. A second convergence part exists between thelower part of a third exhaust manifold and the lower part of a fourth exhaust manifold, and the third exhaust manifold and the fourth exhaust manifold are merged into a second merging part below the second convergence part. The first merging part and the second merging part extend to a third convergence part and are merged into a third merging part below the third convergence part. An exhaust manifold body below the third merging part communicates with a supercharger through an outlet flange. The supercharged engine exhaust manifold is applied to a supercharged gasoline engine with 4cylindersand a firing sequence of 1-3-4-2, the exhaust flow velocity and the exhaust pressure wave peak value are high, the scavenging capacity is sufficient, the exhaust interference between the two cylindersof every two adjacent firing sequences is reduced, the in-cylinder exhaust gas quality is obviously reduced, the combustion state is improved significantly, and a low-speed full-load firing angle canbe advanced by 2-4 degrees CA.

Description

technical field [0001] The present invention relates to an engine exhaust manifold, and more particularly, the present invention relates to a new and improved solution for an engine exhaust manifold, wherein the exhaust manifold is used in an inline four-cylinder supercharged engine. Background technique [0002] The traditional in-line 4-cylinder engine adopts a four-in-one exhaust manifold, and there is mutual interference in the exhaust gas between cylinders. For example, the exhaust gas of the first cylinder will affect the exhaust process of the adjacent third cylinder, resulting in an increase in the mass of exhaust gas in the third cylinder, resulting in Especially in low-speed full-load and nearby working conditions, combustion deterioration, or knocking combustion, must be controlled through measures such as fuel enrichment or delaying the ignition angle, which affects engine power and economy. In terms of exhaust energy utilization, there is no relevant patent lite...

AI Technical Summary

Problems solved by technology

The above-mentioned patents are mainly aimed at improving the exhaust flow capacity of naturally aspirated engines and accelerating the ignition speed of catalytic converters, improving exhaust gas purification capabilities. For supercharged engines, using exhaust pressure waves to improve scavenging, shortening the length of exhaust pipes and increasing exhaust gas Energy, improved combustion, and increased dynamics are not covered

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