Question

y-SE (10 marks) Question2 A 3-liter, four-cylinder engine is equipped with multipoint port fuel injection, having Cone injector per cylinder. Maximum power is obtained at WOT when injection duration is continuous. At this condition, engine speed is 6000 RPM with stoichiometric gasoline [(A/F), = 14.6) and the inlet pressure and temperature are 101 kPa and 25°C, respectively. At idle condition, the engine speed is 1000 RPM with stoichiometric gasoline and the inlet pressure and temperature are 30 kPa and 25°C, respectively. Volumetric efficiency can be considered 95% at all conditions. Consider Ran-0287 kJ/kg.K Calculate: (a) Fuel flow rate through an injector at WOT. [kg/sec] (b) Injection pulse duration in seconds at idle conditions. (o) Injection pulse duration in degrees of engine rotation at idle conditions. -7 Useful Relations p..Vi

Answer 1

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