Online combustible gas mixing method of gas engine
A gas engine and engine technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of high risk, high cost, high difficulty, etc., achieve high economy, meet the effect of scientific research and use requirements
Active Publication Date: 2015-03-11
ZHEJIANG UNIV
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Problems solved by technology
Among them, the constant pressure ratio adopts external mixing, and after mixing, it is used as a single fuel to supply the engine, but the gas distribution needs to be carried out under high pressure, which is dangerous and difficult, and the component concentration is fixed, and it will generate a lot of waste
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Embodiment Construction
[0022] The present invention will be further described below in conjunction with accompanying drawing.
[0023] figure 1 It is a gas supply control block diagram of a gas engine adopting the present invention. The gas engine is modified on the basis of a gasoline engine, and m groups of gas injection rails are added near the valve in the intake manifold, corresponding to the m gas components of the mixture, and one group of injection rails is controlled by the engine ECU. The rest of the injection rails are controlled by the control unit, which calculates the injection pulse width of the corresponding gas according to the volume fraction of each gas component on the basis of the injection pulse width obtained by the engine ECU to find the MAP, so as to realize the injection pulse width of various gases in a certain proportion. mix. In addition, the accuracy of the mixing ratio is ensured through the correction of the injection pulse width by parameters such as temperature an...
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The invention provides an online combustible gas mixing method of a gas engine. If mixed gas consists of m combustible gases, m groups of injection rails are installed at a position close to a gas valve on an engine gas inlet manifold and respectively correspond to gas tanks of m combustible gases. An engine ECU determines gas injection pulse width through a map searching method according to engine working conditions, corrects the gas injection pulse width and controls the injection rails to inject a proper amount of combustible gas. A control unit acquires the gas injection pulse width in the map of the engine ECU under the current working condition, calculates the current gas injection pulse width of the corresponding combustible gas and corrects the gas injection pulse width according to measured temperature and pressure. A linear oxygen sensor is used for measuring excess air coefficient, and a calibration system is used for calibrating the gas injection pulse width in the map under the current working condition to enable the excess air coefficient to be 1, such that the combustible gas in the engine can be fully combusted. The invention provides an online mixing system which is safe and convenient, and the concentration of components can be flexibly changed by modifying the control unit.
Description
technical field [0001] The invention belongs to the technical field of engine engineering, and relates to a method for online mixing combustible gas of a gas engine. It is suitable for gas engines modified from gasoline engines at present. When the fuel is a mixture of various combustible gases, the combustible gases can be mixed online in proportion. It operates under the condition of optimal air-fuel ratio, and by modifying the program of the control unit, it can realize the mixing of various combustible gases in different proportions. Background technique [0002] With the rapid development of the automobile industry, its huge energy consumption has threatened the country's energy supply security, and at the same time, a large amount of exhaust gas has also directly threatened the ecological environment and human health. Alternative fuels for clean vehicles have become an important research topic in various countries. Alcohol fuel and gaseous fuel are the most widely use...
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IPC IPC(8): F02D19/08
Inventor 何海斌吴锋姚栋伟陈科平刘晓晨
Owner ZHEJIANG UNIV