Pneumatic intake-exhaust circulation device

Abstract

The invention relates to a pneumatic intake-exhaust circulation device in the technical field of internal combustion engines. The pneumatic intake-exhaust circulation device comprises an intake pipe, an engine, an exhaust pipe, a gas compressor, a turbine, connecting pipes, a volume cavity, a moving body and a flexible assembly; wherein the connecting pipes are communicated with volume cavity wall faces, the moving body is arranged in the volume cavity and is in sealed contact with the internal volume cavity wall face, a through pipe penetrates through the left and right wall faces of the moving body, and both ends of the flexible assembly are connected with the upper wall face of the moving body and the upper volume cavity wall face respectively. When the engine operates in medium and low speed conditions, the moving body moves upwards in the volume cavity, the exhaust gas recirculation rate is larger, exhaust temperature of each engine cylinder is lower, and the performance of the whole engine is better. When the engine operates in a high speed condition, the moving body moves downwards in the volume cavity, the exhaust gas recirculation rate is lower, and the dynamic performance of the engine and the performance of the whole engine are better. The pneumatic intake-exhaust circulation device is reasonable in design, simple in structure and applicable to an exhaust gas recirculation system with a turbocharger.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system in the field of internal combustion engines, in particular to a pneumatic intake and exhaust circulation device with a turbocharger. Background technique [0002] Harmful emissions from engines are a major source of air pollution. With the increasing importance of environmental protection, the goal of reducing harmful emissions from engines has become an important direction for engine development in the world today. With the world's consumption of petroleum products increasing year by year, international oil prices remain high, and the economy of diesel vehicles is becoming more and more prominent, which makes diesel engines occupy an increasingly important position in vehicle power. Therefore, it is the primary task of diesel engine designers to carry out research on the control methods of harmful emissions from diesel engines. Exhaust gas recirculation system is to send a small part of the...

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Problems solved by technology

[0003] After searching the existing technical literature, it is found that Chinese patent number ZL200410063439.5, patent name: electronic exhaust gas recirculation gas control device, this patent technology provides a device for controlling the exhaust gas recirculation rate of the engine, which can better Taking into account the medium and high speed conditions of the engine; but the change of the exhaust gas recirculation rate is realized through a special control structure, which makes the control system more complicated

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