A series HEV that uses

Atkinson cycle engine has a combined efficiency of 79% from the generator to the

wheel. When the vehicle was tested on a chassis dynamometer, the vehicle road

load energy was found to be 3 MJ. Determine the engine efficiency and the amount of fuel (liter) consumed

during this test, if

• The fuel is gasoline with specific energy of

  42.6 kJ/g and density of 0.75 kg/L.

• When the engine operates at its optimum operating

  condition with BSFC of 220 g/kWh, it generates output power of 20 kW.