Air inlet connecting pipe of EGR engine

Abstract

The invention discloses an air inlet connecting pipe of an EGR engine. The air inlet connecting pipe comprises a fresh air inlet single pipe and an exhaust gas mixing tube. The two ends of the fresh air inlet single pipe are provided with a sharing air inlet and a sharing air outlet respectively. The sharing air inlet is connected with a device used for providing fresh air, the sharing air outlet is connected with an air inlet pipe, and an electronic throttle valve which is in control connection with an engine ECU is connected between the sharing air inlet and the sharing air outlet in series. The exhaust gas mixing tube uses the sharing air inlet together with the fresh air inlet single pipe, and an air outlet of the exhaust gas mixing tube is connected into the fresh air inlet single pipe on the upstream portion of the sharing air outlet. A Venturi tube is additionally arranged in the exhaust gas mixing tube, an exhaust gas channel hole which is led to the inside of the Venturi tube is formed in the throat portion of the equal diameter of the Venturi tube, and an exhaust gas air inlet is formed in the side wall of the exhaust gas mixing tube corresponding to the exhaust gas channel hole. According to the air inlet connecting pipe of the EGR engine, a double-channel air inlet mode is adopted, the mixing uniformity of exhaust gas and the fresh air is improved, and nitric oxide in the exhaust gas can be effectively lowered.

Description

technical field [0001] The invention relates to the field of engines, in particular to an EGR engine intake connection. Background technique [0002] The purpose of the engine intake connection is to connect the engine intake pipe and the device that provides fresh air (such as: intercooler). When the engine has an EGR device, the intake connection also serves to connect the exhaust gas and fresh air introduced from the exhaust pipe. The role of mixing. EGR refers to exhaust gas recirculation (Exhaust Gas Recirculation), which is a technology (method or method) that separates a part of the exhaust gas after combustion in a small internal combustion engine for automobiles, and introduces it into the intake side for recombustion. The main purpose is to reduce nitrogen oxides (NOx) in the exhaust gas and improve fuel consumption when sharing part of the load. [0003] Most of the existing EGR engine intake pipes use an air intake hole connected to the exhaust gas on the pipe ...

AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of the existing technology of EGR engine intake connection is that the mixing of exhaust gas and fresh air is poor. At the same time, when the pressure difference between the exhaust gas and the intake air at low speed is small, the ratio of fresh air to exhaust gas cannot be controlled, that is, the engine cannot be realized. The dynamic control of the EGR rate (only a single EGR rate can be provided), the reduction effect of nitrogen oxides (NOx) in the exhaust gas is poor, and the fuel consumption rate is poor when sharing part of the load.

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