Exhaust gas recirculation system for internal combustion engine

Abstract

The invention discloses an exhaust gas recirculation system for an internal combustion engine. The exhaust gas recirculation system comprises a cooling component, a gas compressor and a gas storage tank which are connected in turn; a gas inlet end of the cooling component is communicated with an exhaust pipe of the internal combustion engine; and a gas outlet end of the gas storage tank is communicated with a gas inlet of the internal combustion engine. The exhaust gas recirculation system has the advantages of simple and compact structure, low cost, stable and reliable work, quick exhaust gas recirculation response, capability of effectively reducing harmful emissions of the internal combustion engine, accurate control on recirculation exhaust gas amount and the like.

Description

technical field [0001] The invention mainly relates to the field of internal combustion engines, in particular to an exhaust gas recirculation system for internal combustion engines. Background technique [0002] The internal combustion engine has the characteristics of small size, small mass, easy to move, high thermal efficiency, and good starting performance. It has been widely used in production and life, and has become one of its main power sources. However, the exhaust gas emitted by internal combustion engines has a high content of harmful gases, which seriously pollutes the atmospheric environment and affects human health. Therefore, in order to curb atmospheric environmental pollution, governments of various countries have promulgated increasingly stringent emission control regulations. [0003] Exhaust Gas Recirculation (Exhaust Gas Recirculation), referred to as EGR, is to send part of the exhaust gas generated by the internal combustion engine back to the cylind...

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Problems solved by technology

However, the temperature of the recirculated exhaust gas using this method is too high, resulting in a high heat load of the EGR intercooler. The temperature of the recirculated exhaust gas after intercooling is still higher than the temperature of the cooling water. The temperature of the charge is not conducive to reducing the combustion temperature; secondly, this method has poor response characteristics under variable working conditions, which is not conducive to the real-time control of EGR in transient working conditions; thirdly, this method reduces the high-pressure and high-energy exhaust gas passing through the turbine, which is not conducive to Conducive to boost pressure increase

[0009] The other is to introduce the exhaust gas after the turbine into the front of the compressor, which is called a low-pressure exhaust gas recirculation system, which can effectively reduce nitrogen oxides, and the recirculation waste temperature is low, which is conducive to reducing the combustion temperature in the cylinder, but the exhaust gas circulation is limited. , EGR cannot be circulated at a higher ratio, and the recirculated exhaust gas using this method has poorer response characteristics under changing operating conditions, which will cause a large difference between the target control EGR amount and the actual EGR amount entering the cylinder, resulting in in-cylinder combustion source emission difference

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