Waste gas recirculation system for spark ignition type supercharged engine and use method of waste gas recirculation system

Abstract

The invention provides a waste gas recirculation system for a spark ignition type supercharged engine. The waste gas recirculation system comprises a gas inlet pipeline, a throttle valve, a gas inlet manifold, a supercharger, an exhaust pipeline, an exhaust manifold, a waste gas posttreatment device, a first intercooler, a bypass valve, a first EGR valve, a first pipeline with a first port and a second port, a second intercooler connected with the bypass valve in parallel, a second EGR valve, a second pipeline with a fourth port and a third port communicated with the first pipeline, and a multiport valve communicated with the first pipeline and the second pipeline; the first port is communicated with the exhaust pipeline between the exhaust manifold and the waste gas posttreatment device; the second port is communicated with the gas inlet pipeline between the throttle valve and the gas inlet manifold; the fourth port is communicated with the gas inlet pipe at the upstream of the supercharger, the multiport valve is controlled to enable the first pipeline to convey waste gas, the bypass valve is controlled to enable the multiport valve to be communicated with the second port, or the waste gas is conveyed to the gas inlet manifold by the first port and the fourth port. The waste gas recirculation system improves EGR rate and improves oil consumption.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system of an engine, in particular to an ignition-type exhaust gas recirculation system for a supercharged engine and its application method. Background technique [0002] Improving engine thermal efficiency and reducing fuel consumption is an important issue facing the automobile industry. Taking gasoline engine as an example, compared with diesel engine, the main reasons for the lower thermal efficiency of gasoline engine include low geometric compression ratio, high pumping loss and low specific heat ratio of mixture, etc. Among them, the main reason for the low geometric compression ratio is the knocking combustion of the gasoline engine under high load. Exhaust gas recirculation system (EGR) refers to the technology that cools the exhaust gas discharged from the engine and re-enters the cylinder to participate in combustion. On the one hand, the introduction of cooling EGR increases the speci...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an ignition-type exhaust gas recirculation system for a supercharged engine and its use method, so as to solve the problems of high fuel consumption and low EGR rate of the existing EGR system under the entire operating condition of the engine

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