A gdi fuel injector heated by ptc thermosensitive ceramics

Abstract

The invention provides a gasoline direct injection (GDI) fuel injector heated by positive temperature coefficient (PTC) thermal sensitive ceramics, and belongs to the technical field of gasoline engine fuel injection systems. According to the GDI fuel injector heated by the PTC thermal sensitive ceramics, the outer ring of the lower portion of a valve body is sequentially wrapped with a PTC thermal sensitive ceramic tube, a pure copper sheet and an insulating sheath, and insulating spacers are arranged between the upper end of the PTC thermal sensitive ceramic tube and a boss of the valve body and between the upper end of the pure copper sheet and the boss of the valve body. A coil conductor is arranged in a sleeve I; the upper end of the coil conductor is connected with a wiring harness plug, and the lower end of a conductor I is connected with an electromagnetic coil. A positive wire and a negative wire are arranged in a sleeve II; the upper end of the positive wire and the upper end of the negative wire are connected with the wiring harness plug; the lower end of the positive wire is connected with the pure copper sheet; the lower end of the negative wire is connected with the lower portion of the valve body. According to the GDI fuel injector, fuel in the fuel injector can be heated to a certain temperature within short time, the fuel injection effect is good, the atomization effect of a direct-injection gasoline engine cylinder in a cylinder is greatly improved; the cold starting combustion efficiency is improved, and the cold starting exhaust gas emission is lowered. The GDI fuel injector heated by the PTC thermal sensitive ceramics is simple in structure, and other systems of an internal combustion engine do not need to be changed greatly.

Description

technical field [0001] The invention belongs to the technical field of fuel injection systems for gasoline engines, and in particular relates to a GDI fuel injector heated by PTC thermosensitive ceramics. Background technique [0002] With the rapid development of the automobile industry, automobile exhaust emits a large amount of harmful substances, which has caused serious pollution to the atmospheric environment on which human beings depend. The pollutants emitted by gasoline-fueled vehicles mainly come from internal combustion engines, and their harmful components include: carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx) and particulate matter; among them, CO, HC and NOx are vehicle pollutants main component of the control. [0003] During the cold start process of a gasoline engine, on the one hand, due to the low temperature in the cylinder, it is difficult to evaporate the fuel, and the quality of the mixed gas is poor, which is not conducive to the ign...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a GDI fuel injector with simple structure, low cost and easy processing to solve the problems of poor fuel atomization quality and high pollutant discharge during the cold start process of in-cylinder direct injection gasoline engine, so as to obtain better economic efficiency. performance and emissions

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