Engine exhaust gas recycling system

Abstract

The embodiment of the invention provides an exhaust gas recycling system. A gas inlet end and an exhaust end in a recirculation pipeline (3) communicate with an exhaust pipeline (1) and a gas inlet pipeline (2) correspondingly, and a branch end communicates with the exhaust pipeline (1); and a main control valve (4) is used for independently closing communication between the communication positionof the exhaust pipeline (1) and the gas inlet end of the recirculation pipeline (3) and the communication position of the exhaust pipeline (1) and the branch end of the recirculation pipeline (3), orindependently closing communication between the branch end of the recirculation pipeline (3) and the exhaust pipeline (1), an auxiliary control valve (5) is arranged between the branch end and the exhaust end of the recirculation pipeline (3), and a heat exchanger (6) is arranged between the gas inlet end and the branch end of the recirculation line (3). The two functions of exhaust gas heat recovery and EGR gas cooling are achieved at the same time through the heat exchanger (6), and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine waste gas reuse system. Background technique [0002] In order to meet the increasingly stringent emission and fuel consumption regulations, various technologies for reducing fuel consumption and improving emissions have emerged, such as Exhaust Gas Recirculation (EGR) technology and exhaust gas heat recovery technology, etc. [0003] Among them, EGR technology refers to cooling a part of the exhaust gas discharged from the cylinder, and passing it into the cylinder again through the intake pipe to re-participate in the combustion process. This technology can delay the combustion time by suppressing the oxygen content at the intake end, reduce the maximum combustion temperature, and improve the knocking situation, so that the cylinder can use a higher compression ratio and reduce fuel consumption. Exhaust gas heat recovery technology means that when the engine is just ...

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Problems solved by technology

[0004] In the process of realizing the present disclosure, the inventors found that, based on the existing technology in this field, if a vehicle needs to apply EGR technology and exhaust gas heat recovery technology at the same time, it is necessary to set up two heat exchangers for these two technologies, The overall structure is relatively complex and the manufacturing cost is high

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