Vehicle system with low-voltage EGR (Exhaust Gas Recirculation) loop

Abstract

The invention discloses a vehicle system with a low-voltage EGR (Exhaust Gas Recirculation) loop, and belongs to the technical field of engine exhaust gas recirculation. The vehicle system comprises an engine, wherein an intake manifold and an exhaust gas manifold are connected to the engine, and the engine is connected with a compressor through the intake manifold and is connected with a turbinethrough the exhaust gas manifold. The low-voltage EGR loop is used for collecting exhaust gas from the vortex of the turbine and treating the exhaust gas so as to obtain recombustion gas, and the recombustion gas is conveyed to the compressor by the low-voltage EGR loop and is conveyed to the engine by the compressor for recombustion. The vehicle system with the low-voltage EGR loop has the beneficial effects that gas is collected from the turbine and does not pass through an aftertreatment system, so that the pipeline layout problem caused by collection of gas from the turbine and the passingof the aftertreatment system is avoided, and additionally, the problems of exhaust energy reduction caused by flowing of exhaust gas through a DPF and economic deterioration caused by installation ofa counterbalance valve are avoided.

Description

technical field [0001] The invention relates to the technical field of engine exhaust gas recirculation, in particular to a vehicle system with a low-pressure EGR circuit. Background technique [0002] At present, the main technologies to effectively reduce the nitrogen oxides of internal combustion engines are SCR (Selective Catalytic Reduction, short for Selective Catalytic Reduction) and EGR (Exhaust Gas Re-circulation, short for Exhaust Gas Recirculation System) technology. The exhaust gas is introduced into the engine to participate in the combustion again, which plays a role in reducing the oxygen concentration and combustion temperature, thereby reducing the formation of nitrogen oxides. [0003] Existing EGR technology is mainly divided into high-pressure EGR technology and low-pressure EGR technology: high-pressure EGR technology is to take exhaust gas from the vortex front of the engine turbocharger, and the exhaust gas returns to the engine intake pipe through EGR...

AI Technical Summary

Problems solved by technology

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a vehicle system with a low-pressure EGR circuit that takes air from behind the turbine and does not pass through the aftertreatment system, thereby avoiding the need to take air from behind the turbine and pass through the aftertreatment system. At the same time, it avoids the exhaust energy reduction caused by the exhaust gas flowing through the DPF and the economic deterioration caused by the installation of the back pressure valve.

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