A method for online mixing of combustible gas by gas engine

Abstract

The invention proposes a method for on-line mixing of combustible gas in a gas engine. If the mixture consists of m types of combustible gases, install m groups of injection rails at the intake manifold of the engine near the valve, corresponding to the gas tanks of m types of combustible gases. According to the engine operating conditions, the engine ECU determines the jet pulse width by searching the MAP map, corrects the jet pulse width, and controls the injection rail to inject an appropriate amount of gas. The control unit collects the jet pulse width in the MAP map of the engine ECU under the current working condition, calculates the jet pulse width of the current corresponding gas, and corrects the jet pulse width according to the measured temperature and pressure. The excess air coefficient is measured by a linear oxygen sensor, and the jet pulse width in the MAP map under the current working condition is calibrated by the calibration system, so that the excess air coefficient is 1, so that the gas in the engine can be fully burned. The invention belongs to an on-line mixing system, which is safe and convenient, and can flexibly change the concentration of components 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...

AI Technical Summary

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

On-line mixing uses in-machine mixing, which can overcome the above shortcomings, but the current commonly used on-line mixing system needs to use high-precision flowmeters, the system is more complicated, and the cost is too high

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