A gdi fuel injector heated by ptc thermosensitive ceramics

Abstract

The invention belongs to the technical field of fuel injection systems of gasoline engines, and relates to a GDI fuel injector utilizing PTC thermal sensitive ceramic for heating. An insulation sheath, a PTC thermal sensitive ceramic pipe and a heat conduction round pipe in the GDI fuel injector sequentially wrap the outer ring of the lower portion of a needle valve, and insulation gaskets are arranged between the upper end of the PTC thermal sensitive ceramic pipe and a boss of the needle valve of the fuel injector and between the lower end of the PTC thermal sensitive ceramic pipe and the boss of the needle valve of the fuel injector respectively. The upper end of a positive wire and the upper end of a negative wire are connected with a wiring harness plug through electric conduction carbon rings and an electric conduction spring, the lower end of the positive wire and the lower end of the negative wire are connected with the positive pole and the negative pole of a heating electrode respectively, and the electric conduction carbon ring I and the electric conduction carbon ring II are connected through the electric conduction spring. The GDI fuel injector belongs to internal heating, fuel in the fuel injector can be heated to high temperature within short time, the fuel injection effect is good, the spraying effect in an air cylinder of a gasoline direct injection engine is greatly improved, cold start combustion efficiency is improved, and cold start tail gas emission is reduced. The GDI fuel injector is simple in structure, and other systems of an internal combustion engine do not need to be greatly modified.

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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