Combined double booster electromagnetic fuel injection-piezoelectric jet mixed fuel injection device

Abstract

The invention aims at providing a combined dual pressurizing electromagnetic fuel oil injection and piezoelectric fuel gas injection mixed fuel injection device.The device comprises a pressurizing part, an electromagnetic and piezoelectric control part, a nozzle part, a fuel gas inlet channel, a fuel oil inlet channel, an oil leakage channel and the like.A pressurizing electromagnetic valve is used for controlling motion of a pressurizing piston to achieve pressurizing of fuel gas and fuel oil, the fuel gas and fuel oil pressurizing timing is controllable, switching of fuel pressurizing injection and fuel non-pressurizing injection can be achieved rapidly, and the different requirements of different powers of a dual-fuel engine on fuel gas and fuel oil injection pressure are met; by controlling the working states and working sequence of the pressurizing electromagnetic valve, a fuel oil electromagnetic valve and a piezoelectric element, the mixed fuel injection device can achieve four injection modes of non-pressurized fuel oil injection, pressurized fuel oil injection, non-pressurized fuel oil and non-pressurized fuel gas dual-fuel injection and pressurized fuel oil and pressurized fuel gas dual-fuel injection.

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] Most of the existing in-cylinder direct-injection dual-fuel engines use high-pressure pumps to compress the fuel and gas...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing in-cylinder direct-injection dual-fuel engines use high-pressure pumps to compress the fuel and gas to the specified pressure. The disadvantages are: the gas nozzle and the fuel nozzle are independently installed on the cylinder head, and the size And the installation position is limited by the cylinder head; the high-pressure pump has a complex structure, and the transmission pipeline from the pump end to the gas nozzle and fuel nozzle is long, and there is a certain leakage of the pressurized fuel; the gas nozzle uses the pressure gas to lift the needle valve, but due to the compression of the gas Strong resistance, which is not conducive to the precise control of 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, resulting in The gas injection pressure and injection rate are reduced, which has a negative impact on the stability of gas injection, affecting engine power and fuel economy

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