In-cylinder sampling system and method for internal combustion engine

Abstract

The invention discloses an in-cylinder sampling system and method for an internal combustion engine. The system comprises a sampling control unit and a sampling tube which, wherein the sampling tube is structurally characterized in that a thin and long tube is arranged at the front end of a cylindrical dilute chamber and is communicated with the dilute chamber, an inert gas inlet tube and a mixed gas outlet tube communicated with the dilute chamber are arranged at the rear part of the dilute chamber, the inert gas inlet tube is provided with an inert gas valve, the mixed gas outlet tube is provided with a three-way valve, the inlet of the three-way valve is connected with the mixed gas outlet tube, a first outlet of the three-way valve is connected with a gas analysis device, a second outlet of the three-way valve is connected with an escape tube, the valve rod of a sampling control valve is screwed at the rear end of the dilute chamber and stretches into the dilute chamber from outside, the valve rod is provided with a sealing device, and a conical head at the front end of the valve rod can plug a gas outlet of the thin and long tube. The system can be used for carrying out partial and instant sampling on the mixed gas in an engine cylinder, so that the component distribution of the gas in the cylinder can be showed actually. The in-cylinder sampling system and method are simple and practical and convenient to operate.

Description

technical field [0001] The invention relates to a gas sampling system and a sampling method of an internal combustion engine, in particular to a local fixed-point gas sampling system and a sampling method in a cylinder of an internal combustion engine. Background technique [0002] The combustion process in the cylinder of an internal combustion engine is fundamental to its economy and emission characteristics. In order to reduce the fuel consumption and emissions of internal combustion engines, many scholars at home and abroad have been devoting themselves to the research on the combustion process of internal combustion engines. The combustion process of the internal combustion engine is very fast and very complicated. In order to study the combustion process of the internal combustion engine, the commonly used methods are PIV method, photoelectric detection method, laser induced fluorescence method and transparent engine visualization method, etc. The above-mentioned metho...

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Problems solved by technology

The above-mentioned methods for studying the combustion process of internal combustion engines often require adding certain substances to the fuel and using very expensive auxiliary equipment, or requiring a large number of modifications to the engine

For example, the PIV method needs to add a certain amount of tracer particles to the fuel, and requires high-precision image recording equipment; It is difficult to transform and cannot work for a long time, and also requires high-precision image recording equipment

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