| 摘要 |
A fuel control system is provided for a spark-ignition internal combustion engine having a source of fuel and means for supplying the fuel from the fuel source and to the engine at variable flow rates. The fuel control method of the present invention is particularly suited for a reciprocating piston aircraft engine and is designed to minimize brake specific fuel consumption of the engine during operation at constant engine rotational speed and load but is capable of supplying additional fuel to the engine during transient operation, for example during an acceleration phase. In brief, when the engine is operating under constant engine rotational speed and load, an engine parameter, such as the exhaust gas temperature, which is correlated to the brake specific fuel consumption for the engine is iteratively sensed and compared to the previously determined value for this parameter. As a result of this comparison, the fuel flow rate to the engine is either stepwise increased or stepwise decreased by predetermined fuel flow increments designed to minimize the brake specific fuel consumption. Moreover, as the fuel flow rate to the engine nears the minimum point for brake specific fuel consumption, the fuel flow rate to the engine is alternatively stepwise increased and stepwise decreased by decreasing fuel flow increments. When the fuel flow increments become less than the predetermined amount, the fuel flow rate to the engine is maintained at its last value until a subsequent change in the engine operating conditions occurs. |
