The Use of Fuel by Spark Ignition Engines

Paper #:
  • 930329

Published:
  • 1993-03-01
Citation:
Ross, M. and An, F., "The Use of Fuel by Spark Ignition Engines," SAE Technical Paper 930329, 1993, https://doi.org/10.4271/930329.
Author(s):
Pages:
12
Abstract:
Fuel consumption per revolution is approximately a linear function of work output per revolution, for power levels less than about two-thirds of the power at wide-open throttle. Thus where N is engine speed, Pf is fuel energy rate (kW), and Pb is power output (kW). The approximation is relatively good for engine speeds typical of regulatory driving cycles. The parameters α and b are studied using engine measurements conducted in the late 1970s. The parameter values are rather uniform, with averages α = 0.29V, where a is in kJ/rev and V is displacement in liters, and b = 2.45 (dimonsionless). Engine maps for more modern engines show, that the parameter a has declined. Several applications are discussed: especially simulation of vehicle fuel use, and creation of a figure of merit for fuel use by engines.
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