Integrated electromagnetic and bi-piezo hybrid fuel injection device

Abstract

The invention provides an integrated type electromagnetic and double-piezoelectric blended fuel injection device which comprises a fuel nozzle and two gas nozzles with the same structure; an electromagnetic valve is utilized to control the fuel nozzle to realize fuel injection; two piezoelectric elements are utilized to control the two gas nozzles to realize gas injection; fuel injection is high in flexibility and can realize multiple injection modes; the fuel nozzle adopts the electromagnetic valve to control motion of a needle valve, and fuel injection mass and fuel injection timing are controllable; the gas nozzles adopt the piezoelectric elements to control motion of the needle valve, the lift of the needle valve is adjustable, and the control precision of gas injection mass and gas injection rate is high; fuel in a needle valve cavity of the fuel nozzle and a needle valve matching part is the same, and the fuel pressure is equal, so that static-state leakage of fuel in the needle valve matching part is avoided; the gas nozzles utilize fuel to seal gas, so that prevention of leakage of gas passing through the needle valve matching part is facilitated, fuel injection pressure and rate are increased, and dynamic property of an engine and fuel economy are improved.

Description

technical field [0001] The invention relates to a fuel injection device for an engine, in particular to an integrated electromagnetic-double piezoelectric hybrid 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 ...

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Problems solved by technology

[0003] The existing in-cylinder direct-injection dual-fuel engines mostly use gas nozzles and fuel nozzles to achieve dual-fuel injection. The disadvantages are: the gas nozzles and fuel nozzles are independently installed on the cylinder head, and the size and installation position are limited by the cylinder head; A single gas nozzle matches the limited power of the engine, and it is difficult to take into account the requirements of gas injection quantity and gas injection law control requirements under different powers. Although two independent gas nozzles can meet the power requirements of the engine in a wide range, the size and installation position are limited by the cylinder head; The nozzle uses pressure gas to prop up the needle valve, but due to the strong compressibility of the gas, it 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, the gas passes through the needle valve and The gap between the valve bodies will intensify leakage to the electromagnetic valve end, resulting in a decrease in gas injection pressure and injection rate, which will have a negative impact on the stability of gas injection, affecting engine power and fuel economy

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