Exhaust recirculating system controlled by exhaust pressure

Abstract

An exhaust recirculating system controlled by exhaust pressure belongs to the technical field of internal combustion engines and comprises a gas inlet pipe, an engine, an exhaust pipe, a gas compressor, a turbine, a connecting pipe, a cavity, a movable part and an elastic component. A third connecting pipe is mounted between a main exhaust pipe and the upper wall surface of the cavity, the cross section of the cavity is rectangular, and the movable part mounted in the cavity hermetically contacts with the inner wall surface of the cavity and is connected with the lower wall surface of the cavity through the elastic component. When the engine is in a medium-speed running state, the movable part moves upwards in the cavity, the exhaust recirculating rate is higher, exhaust temperature is lower, and the integral performance of the engine is excellent. When the engine is in a high-speed running state, the movable part moves downwards in the cavity, the exhaust recirculating rate is lower, the dynamic property of the engine is better, and the integral performance of the engine is excellent. The exhaust recirculating system controlled by exhaust pressure is reasonable in design and simple in structure and applicable to exhaust recirculating systems with turbochargers.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system in the field of internal combustion engines, in particular to an exhaust gas recirculation system controlled by exhaust pressure 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 ...

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Problems solved by technology

[0003] After searching the existing technical literature, it was 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 take 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, so that the control system changes quite complicated

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