Exhaust-pressure regulated exhaust-gas recirculating system

Abstract

The invention relates to an exhaust-pressure regulated exhaust-gas recirculating system in the technical field of internal-combustion engines, which comprises an air-inlet pipe, an engine, a general exhaust pipe, an air compressor, a turbine, connecting pipes, a volume cavity, a moving body and an elastic part, wherein a third connecting pipe is installed between the general exhaust pipe and the upper wall surface of the volume cavity, the cross section of the volume cavity is rectangular, the moving body is installed in the volume cavity and is hermetically contacted with the inner wall surface of the volume cavity, and the moving body is connected with the upper wall surface of the volume cavity through the elastic part. When the engine is under a medium-speed working condition, the moving body upwards moves in the volume cavity, the exhaust-gas recirculating rate is larger, the exhaust temperature is lower, and the overall performance of the engine is more excellent; and when the engine is under a high-speed working condition, the moving body downwards moves in the volume cavity, the exhaust-gas recirculating rate is smaller, the dynamic property of the engine is better, and the overall performance of the engine is more excellent. The exhaust-pressure regulated exhaust-gas recirculating system has a reasonable design and a simple structure and is applicable to the exhaust-gas recirculating 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 an exhaust gas recirculation system with a turbocharger adjusted by exhaust pressure. 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 sm...

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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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