Disconnecting and connecting shifter for two gas circuits

Abstract

The invention discloses a disconnecting and connecting shifter for two gas circuits. The disconnecting and connecting shifter comprises a gas inlet tube, an engine, an exhaust pipe, a gas compressor, a turbine, a connecting tube, an accommodating cavity, a mobile body and an elastic part, wherein the connecting tube is communicated with the wall surface of the accommodating cavity; the mobile body is installed inside the accommodating cavity and is contacted with the inner wall surface of the accommodating cavity in a sealed manner; a through tube gets through left and right wall surfaces of the mobile body; and the two ends of the elastic part are respectively connected with the lower wall surfaces of the mobile body and the accommodating cavity. When the engine is at a medium-low speed working condition, the mobile body upwards moves in the accommodating cavity, so that the waste gas recirculation rate is large, the exhaust temperature of each cylinder of the engine is low, and the overall performance is excellent; when the engine is at a high-speed working condition, the mobile body downwards moves in the accommodating cavity, so that the waste gas recirculation rate is small, the dynamic performance of the engine is good, and the overall performance is excellent. The disconnecting and connecting shifter is rational in design and simple in structure, and is applicable to a waste gas recirculation system with a turbo-supercharger.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system in the field of internal combustion engines, in particular to a switching device for separating and connecting two gas paths 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 smal...

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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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