Method for manufacturing pressure-stabilizing rail of hydrogen internal combustion engine
A hydrogen internal combustion engine and voltage stabilization technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of shortened driving range, low energy density, and reduced engine power performance
Inactive Publication Date: 2012-04-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0004] Hydrogen also has certain deficiencies as a vehicle fuel, mainly manifested in its low energy density. The theoretical fuel-to-air equivalence ratio of hydrogen is only 2.38, which indicates that hydrogen will occupy a large volume in the mixed gas, which poses a challenge to the hydrogen supply system. High demands: large volumes of hydrogen must be injected in a short time
In order to meet the fuel flow demand of the hydrogen internal combustion engine, the current methods mainly include increasing the injection pressure and increasing the injection pulse width. Increasing the injection pressure will cause a decrease in the safety performance of the sealing system, and at the same time increase the residual pressure of the gas cylinder and shorten the driving mileage; The large hydrogen injection pulse width is limited by the tempering problem, so try to use a smaller hydrogen injection pulse width under the condition of satisfying the power output, but the hydrogen injection pulse width is limited by the nozzle performance and the adjustment range is limited
In high-speed, heavy-load conditions, in order to ensure the power output of the hydrogen internal combustion engine, high-frequency, high-flow hydrogen injection must be used, which will inevitably cause large pressure fluctuations in the hydrogen supply system and reduce the power performance of the engine. In severe cases Will affect the stable operation of the engine
[0005] In order to solve the above problems and achieve precise control of hydrogen supply, installing a pressure stabilizing track at the front of the nozzle can effectively stabilize the injection pressure, but too large a volume of the stabilizing track will affect the overall layout of the internal combustion engine and increase the cost of the system
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[0015] According to an embodiment of the present invention, the manufacturing steps for the hydrogen fuel internal combustion engine voltage regulator rail are: first, calculate the maximum cycle according to the relevant technical parameters of the hydrogen fuel internal combustion engine, such as the single cylinder displacement of the internal combustion engine, the number of strokes, the calibrated speed, the nature of hydrogen, etc. Hydrogen supply; select the hydrogen fuel nozzle and determine the hydrogen supply pressure and the corresponding maximum injection pulse width according to its flow characteristics; use gas dynamics theory to establish a hydrogen fuel rail model similar to the high-pressure common rail of a diesel engine, and analyze rail pressure fluctuations; according to The distance between the cylinder centers determines the length of the hydrogen fuel rail. Under the condition that the rail pressure changes within the allowable range, the minimum cross-se...
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The invention aims at providing a method for manufacturing a pressure-stabilizing rail of a hydrogen internal combustion engine. The minimum volume of a fuel rail can be designed aiming at an air inlet jet hydrogen engine, constant fuel jet pressure of the hydrogen internal combustion engine in a working process is met, concentration of a mixed gas is controlled accurately, and optical control of the hydrogen internal combustion engine under full working conditions is realized. In order to realize the purpose of the invention, the invention provides the method for manufacturing the pressure-stabilizing rail of the hydrogen internal combustion engine. The method comprises the following steps of: 1, calculating the maximum circulating jet quantity; 2, determining a fuel rail length according to the center distance of a cylinder; 3, selecting a fuel supply pressure and a maximum jet pulse width corresponding to the fuel supply pressure according to nozzle characteristics; and 4, analyzing a relationship of a rail sectional area and a rail pressure fluctuation of the pressure-stabilizing rail according to a gas fuel rail model, and determining the minimum rail sectional area by using a pressure fluctuation rate of less than 5 percent as a limit value in a hydrogen rail when the hydrogen internal combustion engine has the maximum hydrogen flow at the calibrated rotating speed.
Description
technical field [0001] The invention relates to the field of intake port injection hydrogen internal combustion engines, in particular to a method for manufacturing a voltage stabilizing rail for hydrogen internal combustion engines. Background technique [0002] The shortage of oil resources in the world and the protection of the ecological environment are the main problems faced by human beings in the 21st century, which poses a great challenge to traditional petroleum fuels. Petroleum alternative fuels such as hydrogen, natural gas and biomass fuels are gaining more and more attention internationally due to their low-emission environmental protection and low fuel costs. [0003] Hydrogen is a clean fuel. Hydrogen-burning internal combustion engines have good emission characteristics. After combustion, only nitrogen oxides and water are produced. When lean mixture is burned, nitrogen oxides can also be reduced to a much lower level than other fuels, so it is Ideal "green"...
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Inventor孙柏刚张冬生刘福水
OwnerBEIJING INSTITUTE OF TECHNOLOGYGY