Intake connecting pipe for diesel engine

Abstract

The invention relates to an intake connecting pipe for a diesel engine, which comprises an L-shaped intake pipe and an exhaust gas recirculation valve installing pipe which are connected back to back, wherein one port of the intake pipe is an electronic throttle valve installing flange port, the other port of the intake pipe is an intake manifold installing flange port, and a sensor installing hole is arranged on the intake pipe; the intake pipe at the side of the electronic throttle valve installing flange port is an intake cavity, and the intake pipe at the side of the intake manifold installing flange port is a mixing cavity; the intake manifold installing flange port and the exhaust gas recirculation valve installing pipe are parallel and adjacent, and a communicated exhaust gas cavity is arranged between the intake manifold installing flange port and the exhaust gas recirculation valve installing pipe; the intake cavity, the exhaust gas cavity and the mixing cavity are formed into a Y-shaped cavity; and an exhaust gas intake flange port is arranged at the other side of the exhaust gas recirculation valve installing pipe. The invention has small volume and reasonable structural arrangement and can meet the arrangement requirement of narrow space of a front chamber of the whole vehicle. The Y-shaped cavity can effectively prevent the fresh air from flowing backwards, improve the exhaust gas recirculation efficiency and reduce the emission of nitrogen oxides.

Description

technical field [0001] The invention belongs to an engine intake mechanism, in particular to a multi-cylinder diesel engine intake mechanism with an exhaust gas recirculation (EGR) system and an electronic throttle. Background technique [0002] On the premise of satisfying the requirements of performance and other aspects, the diesel engine should try to make the structure relatively compact to facilitate the layout of the front cabin of the whole vehicle, especially in light vehicles. [0003] Generally, diesel engines use exhaust gas recirculation (EGR) technology to reduce nitrogen oxides (NOx) in combustion exhaust gas, especially engines with emission indicators above Euro III, most of which use electric exhaust gas recirculation (EGR) technology. There are two ways to arrange the traditional electric exhaust gas recirculation (EGR) valve: one is installed on the exhaust gas recirculation (EGR) valve seat, connected with the exhaust gas recirculation (EGR) pipeline; th...

AI Technical Summary

Problems solved by technology

The disadvantages of these two arrangements are: first, the structure is not compact, and it cannot be matched with the whole vehicle, especially the front cabin space of light vehicles is small, so the arrangement is particularly difficult; second, the exhaust gas is exported from the exhaust gas recirculation (EGR) valve The distance of mixing with fresh air through the pipeline is too long, and the pressure drop is too large, which will affect the EGR rate and is not conducive to reducing nitrogen oxides (NOx)

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