Hydrogen gas natural gas mixed fuel engine optimizing method

A technology of mixed fuel and optimization method, which is applied in the direction of combustion engine, internal combustion piston engine, gaseous engine fuel, etc., can solve the problems of unobtainable control parameters, large amount of experiments, etc., and achieve economic optimization, emission performance optimization, and comprehensive performance improvement Effect

Active Publication Date: 2008-12-31
TSINGHUA UNIV
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Problems solved by technology

[0006] Since the three control variables hydrogen doping ratio, excess air coefficient and ignition advance angle have a coupling relationship on engine economy and emission, it is a three-variable multi-objective optimization proble

Method used

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  • Hydrogen gas natural gas mixed fuel engine optimizing method
  • Hydrogen gas natural gas mixed fuel engine optimizing method
  • Hydrogen gas natural gas mixed fuel engine optimizing method

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Embodiment Construction

[0030] The principle and working process of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the embodiment, the selected operating point is the speed of 1200r / min, the torque of 200N.M, the range of ignition advance angle is 20-40 degrees, the adjustment range of excess air coefficient is 1.1-1.6, and the adjustment range of hydrogen doping ratio is 0-40%. The overall flow of the optimization control method is as follows: figure 1 Shown:

[0031] 1) Experimental design

[0032] The main purpose of using experimental design is to obtain the most important information with the least number of experiments. From the point of view of hydrogen doping ratio, ignition advance angle, excess air coefficient adjustment range and each adjustment amount, if all experiments are done at all experimental points, 330 experiments need to be done. This is only the experimental amount required for one speed and torque oper...

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Abstract

Disclosed is an optimizing method for a hydrogen and natural gas mixed fuel engine, which belongs to the hydrogen and natural gas mixed fuel engine technical field. The invention aims to effectively discover three control variables, including the optimum hydrogen mixing ratio, ignition advance angle and the excess air factor under each operating condition and obtain the optimum comprehensive performance of the engine. The rotation speed and the torque are used for determining the operating condition point; the three-dimension state space of the hydrogen mixing ratio, the ignition advance angle and the excess air factor is determined under the operating condition point; based on the method of experimental design, the most representative point is selected for the experiment; the data is acquired after the experiment; the points in the data are used for establishing the engine error backward neural network model; namely, the relation of the control variables of the hydrogen mixing ratio, ignition advance angle and the excess air factor, and the economical exhaust is established; the model data is exported and the genetic algorithm is adopted to optimize the engine control parameters; finally, the control variables of optimum hydrogen mixing ratio, the ignition advance angle and the excess air factor of the engine are acquired under the operating condition so that the optimum engine performance is obtained.

Description

technical field [0001] The invention relates to an optimization method for a hydrogen-natural gas mixed fuel engine, and belongs to the technical field of natural gas hydrogen-mixed fuel engine. Background technique [0002] Hydrogen-mixed natural gas fuel is referred to as HCNG, also known as Hythane (hydrogen), which is an alternative gas fuel obtained by mixing hydrogen and natural gas in a certain proportion. It combines the respective advantages of hydrogen and natural gas: 1. The combustion speed of hydrogen is high, about 8 times that of natural gas. Adding hydrogen to natural gas can increase the combustion speed of the mixture, and the ignition can be closer to the top dead center of the engine, reducing compression Negative work, increasing the constant volume of combustion can improve thermal efficiency; 2. The combustible mixing limit of hydrogen is wide, and the lean combustion limit reaches 0.068 (relative fuel-air ratio); the quenching distance is only 30% of ...

Claims

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Application Information

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IPC IPC(8): F02B43/10F02D43/00
CPCY02T10/30
Inventor 马凡华汪俊君王宇赵淑莉王业富丁尚芬江龙王明月
Owner TSINGHUA UNIV
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