Engine exhaust-gas recirculating system with throttling device

Abstract

The invention provides an engine exhaust-gas recirculating system with a throttling device, which comprises an engine combustion chamber, an exhaust manifold and an intake manifold for the engine and an exhaust-gas recirculating pipe (EGR pipe) connected between the exhaust manifold and the intake manifold; and a throttling device is arranged in the exhaust-gas recirculating pipe and is used for transversely blocking a passage for the exhaust-gas recirculating pipe, and a throttling hole is cut on the throttling device and used for ducting the exhaust-gas recirculating pipe. By adopting the technical proposal, the external exhaust-gas recirculating method can be adopted on the engine, and when the plastic intake manifold is used, the temperature of the exhaust-gas to enter in the intake manifold can be effectively controlled so as to meet the requirements of reliability and durability of the intake manifold; and as the throttling device is arranged in the original EGR pipeline in the technical proposal, extra layout space is not occupied, simultaneously, the commonly-used EGR inter-cooling device on the current engine can be effectively replaced, the exhaust-gas temperature is controlled by using the throttling and temperature reducing mechanism and the engine exhaust-gas recirculating system has the advantages of simple structure and lower cost.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system of an engine, especially an external exhaust gas recirculation system in which an intercooling device cannot be arranged and installed due to space constraints. Background technique [0002] EGR is exhaust gas recirculation technology, which is one of the important technical means to improve the fuel economy of the engine and reduce emissions. Among them, e-EGR is the external exhaust gas recirculation technology, which is to draw part of the exhaust gas of the engine from the exhaust manifold and reintroduce it into the cylinder through the intake manifold, so as to realize the optimal control of the combustion process and improve the fuel economy of the engine. , emissions and other performance. In the automotive field, plastic intake manifolds have smoother airway surfaces and better molding processes than aluminum alloy intake manifolds, which are conducive to improving engine performanc...

AI Technical Summary

Problems solved by technology

However, if both the EGR system and the plastic intake manifold are used on the engine, and the intercooler cannot be used in terms of cost and space constraints, the exhaust gas entering the intake manifold through the EGR line will The temperature may be higher, reaching about 120 degrees Celsius, especially when adding an EGR system to an engine without an EGR system, and the original space is too small to arrange an intercooler, and at the same time a shorter EGR pipeline must be used. The local temperature near the intake manifold is too high, which cannot meet the reliability and durability requirements of the intake manifold

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