FIELD: engine building.
SUBSTANCE: current outlet pressure of the injector is calculated based on the current pressure in the inlet pipe and the current rotation speed without measuring the outlet pressure of the injector using the sensor. State of fluidity of gas can be determined based on ratio of current output pressure to current input pressure of nozzle, obtained using sensor, so that flow rate parameters corresponding to yield strength can be selected so as to calculate duration of injector engagement to establish air-fuel ratio based on said duration of connection. Duration of connection can be calculated on the basis of parameters of flow rate in appropriate conditions of fluidity, thus achieving air-fuel ratio with high accuracy.
EFFECT: method and system for controlling air-fuel ratio for a gas engine are disclosed.
9 cl, 4 dwg, 2 tbl
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