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Comparison of the instantaneous fuel consumption of vehicles with a different type of propulsion system at constant velocity

Gołębiewski W., Stoeck T.

Journal of KONES

2014

Vol. 21, No. 3

113--120

The paper presents a comparative analysis of the instantaneous fuel consumption of a FIAT Panda vehicle equipped with a 1.3 JTD MultiJet compression ignition engine with Common Rail fuel system. Different types of propulsion system were taken into consideration (engine positioned front-lengthwise to the direction of travel and rear-wheel drive, engine positioned front-transversely to the direction of travel and front-wheel drive, and all-wheel drive). The method for determining the instantaneous fuel consumption was based on an experimental part where the load characteristics were established (relationship between specific fuel consumption and engine torque). It was carried out for the steady states of these parameters corresponding to specific traffic conditions that represent the resistance to motion, i.e. rolling resistance and air resistance. Technical and operating characteristics of a vehicle and its design features, such as maximum weight, transmission system ratios, dynamic wheel radius, drag coefficient, width and height, and efficiency of propulsion system, had a significant impact on their individual contribution. The efficiency of transmission was adopted from a simulation for different types of propulsion system. It was important in determination of the value of instantaneous fuel consumption for constant vehicle velocities used in the UDC test (Urban Driving Cycle – subtest of the EUDC cycle). The lowest fuel consumption for a given speed of a car occurred for the front-wheel drive transmission system, whereas the highest for the all-wheel drive system (4x4).