Combined Electromagnetic Fuel Injection - Supercharged Piezoelectric Jet Mixed Fuel Injection Device

Abstract

The invention aims at providing a combined electromagnetic fuel oil injection and pressurizing piezoelectric fuel gas injection mixed fuel injection device.The mixed fuel injection device comprises a fuel gas pressuring part, an electromagnetic and piezoelectric control part, a nozzle part, a fuel gas inlet channel, a fuel oil inlet channel and the like.A pressuring electromagnetic valve is utilized for controlling motion of a pressuring piston to achieve fuel gas pressurization, an electromagnetic valve is utilized for controlling a fuel oil nozzle to achieve fuel oil injection, a piezoelectric element is utilized for controlling a fuel gas nozzle to achieve fuel gas injection, and three working modes of pure fuel oil injection, fuel oil and non-pressurized fuel gas dual-fuel injection and fuel oil and pressurized fuel gas dual-fuel injection can be achieved.Switching of fuel gas pressurizing injection and fuel gas non-pressurizing injection can be rapidly achieved, the different requirements of different powers of a dual-fuel engine on fuel gas injection pressure are met, switching of pure fuel oil injection and dual-fuel injection can be achieved, the fuel oil injection amount and fuel injection timing are controllable, and therefore the gas injection pressure and injection speed are increased, and the power property of the engine and the fuel economical efficiency are improved.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a dual-fuel engine fuel injection device. Background technique [0002] The development of alternative fuels for engines is one of the very effective means to solve the problems of energy shortage and environmental pollution. Due to the advantages of abundant reserves, low price and low pollution emissions, gaseous fuel has become an alternative fuel for engines with good development prospects. Although the gas engine using only one gas fuel has clean emissions, the gas fuel used has low energy density, high fuel consumption, and limited use direction; while the dual-fuel engine using diesel as the pilot fuel and gas fuel as the main fuel can be used in Flexible switching between the two fuels, high fuel substitution rate, good power, economy and emissions. [0003] The existing in-cylinder direct-injection dual-fuel engines mostly use electromagnetically controlled gas nozzles and fu...

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Problems solved by technology

[0003] The existing in-cylinder direct-injection dual-fuel engines mostly use electromagnetically controlled gas nozzles and fuel nozzles, and gas boosters mostly use high-pressure pumps to compress the gas to a specified pressure. On the cylinder head, the size and installation position are limited by the cylinder head; the structure of the high-pressure pump is complex, the transmission pipe from the pump end to the gas nozzle is long, and there is a certain leakage of the pressurized gas; the gas nozzle uses the pressure gas to lift the needle valve, but due to the gas The strong compressibility is not conducive to the precise control of the needle valve movement, and the gas injection is unstable; in addition, during the gas injection process, with the movement of the needle valve, the leakage of gas to the solenoid valve end through the gap between the needle valve and the valve body is intensified. , leading to a decrease in gas injection pressure and injection rate, which has a negative impact on the stability of gas injection, affecting engine power and fuel economy

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