Gas taking pipeline structure of GPF differential pressure sensor

Abstract

The invention relates to a gas taking pipeline structure of a GPF differential pressure sensor. The gas taking pipeline structure comprises a first differential pressure sensor gas taking pipe and a second differential pressure sensor gas taking pipe which are arranged on a gasoline engine particle trap body. The gasoline engine particle trap body comprises a GPF barrel, a ceramic core, a front end cone and a rear end cone. An axial through hole is formed close to the edge of the ceramic core body, and a first welding hole and a second welding hole are formed in the conical surface of the front end cone; one end of a first gas taking pipe of the differential pressure sensor penetrates through a second welding hole of the front-end cone and extends into the GPF barrel, and the other end of the first gas taking pipe is matched and fixed with the second welding hole; one end of a second gas taking pipe of the differential pressure sensor penetrates through the first welding hole of the front end cone, extends into the GPF barrel and penetrates through the through hole in the ceramic core body, and the other end of the second gas taking pipe of the differential pressure sensor is matched and fixed with the first welding hole. The gas taking pipe can be prevented from being exposed in the air, the blockage of an icing assembly in the gas taking pipe is avoided, and the accurate monitoring of the GPF function is ensured.

Description

technical field [0001] The invention relates to an automobile exhaust system, in particular to a gas intake pipeline structure of a GPF differential pressure sensor. Background technique [0002] Gasoline direct injection (GDI) has been widely used in passenger cars due to its advantages of better power and fuel economy. However, because the fuel of the GDI gasoline engine is directly injected into the cylinder, the uneven mixing of oil and gas and the wet wall of the fuel lead to a significant increase in the quality and quantity of particulate matter emissions. More and more stringent regulations require direct injection gasoline engines to maintain stable and low PM emissions in a wider range of operating conditions. The Euro VI emission regulations have stricter restrictions on the quality of particulate matter emissions, and the PM limit has been reduced to 4.5mg / km. The "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" issued on ...

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