Combined piezoelectric and pressurizing electromagnetic fuel gas injection device

Abstract

The invention provides a combined piezoelectric and pressurizing electromagnetic fuel gas injection device which comprises a pressurizing part, an electromagnetic-piezoelectric control part, a double-piston part, a double needle valve nozzle part and an injection device shell.Electromagnetic valves and a piezoelectric control valve are adopted to control the fuel gas injection process of two nozzles respectively; the nozzle controlled by the electromagnetic valves can be switched between a pressurizing mode and a non-pressurizing mode flexibly, adjustable gas injection pressure and gas injection quantity of the gas injection device can be achieved in a work cycle by adjusting the work state and work order of the pressurizing electromagnetic valve, the nozzle electromagnetic valve and the piezoelectric control valve, and the power requirements of an engine under different working conditions and series engine power requirements are met.A seal band is designed between each needle valve and a corresponding needle valve seat, part of control oil is introduced to the seal bands through an oil duct to seal fuel gas, leakage of fuel gas can be effectively prevented, meanwhile control oil in a control cavity and sealing oil at the needle valves are the same, and static leakage of the fuel oil in the control cavity and the sealing bands can be effectively prevented.

Description

technical field [0001] The invention relates to a dual-fuel engine gas injection device, in particular to a combined piezoelectric-supercharged electromagnetic gas injection device. Background technique [0002] The development of alternative fuels for engines is an effective means to solve the problems of energy shortage and environmental pollution. Natural gas and petroleum gas have become the main substitute fuels for internal combustion engines due to their abundant resources, low price, clean combustion, and high calorific value. [0003] The current in-cylinder direct injection gas injection system mainly controls the movement of the needle valve through the internal integrated high-speed solenoid valve to realize the opening and closing of the gas injection valve, which can control the timing and amount of gas injection, and has good energy saving and emission reduction effect, but there are some problems: first, the single-cylinder power coverage of the engine is la...

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Problems solved by technology

[0003] The current in-cylinder direct injection gas injection system mainly controls the movement of the needle valve through the internal integrated high-speed solenoid valve to realize the opening and closing of the gas injection valve, which can control the timing and amount of gas injection, and has good energy saving and emission reduction effect, but there are some problems: first, the single-cylinder power coverage of the engine is large, and only the single-nozzle jet device is used to match the limited engine power, which cannot meet the power of the engine under different working conditions and the power requirements of serialized engines; , a single high-speed solenoid valve only has two working states of on and off, and cannot complete the multi-mode control of gas injection; third, the control of the solenoid valve is affected by the hysteresis loop and the inductance of the solenoid coil, the response speed is limited, and the control accuracy of the piezoelectric control valve is limited. High, fast response; Fourth, in order to improve the degree of gas mixing, the gas injection pressure is usually increased, the existing gas injection device can not realize the adjustable injection pressure in a working cycle; Fifth, with the movement of the needle valve, the gas along the The gap between the needle valve coupling parts leaks upwards, and the leaked gas enters the control chamber, resulting in a decrease in the gas injection pressure and injection rate, which seriously affects the working stability of the gas injection device

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