Calculation methods for determining of fuel consumption per hour by transport vehicles

Abstract

The paper proposes a mathematical model by which it is possible to calculate the hourly fuel consumption for an internal combustion engine operating at idle mode or with a constant load. Simplification of the technique consisted in the calculation of the coefficients of filling the engine cylinders and the excess air through the approximation by polynomials of the first and second degree. It is established that when the engine is running without load, the hourly fuel consumption increases in proportion to the rotational speed of the crankshaft and the engine displacement. Examples of calculating the standard fuel consumption at idle mode with the engine off without a load are given for a Skoda Octavia 1.6 MPI with a gasoline engine and a Skoda Octavia 2.0 TDI with a diesel engine. Graphic dependencies of the hourly fuel consumption change on the crankshaft rotation speed for the petrol and diesel Skoda Octavia were obtained. The calculation was carried out and graphical dependencies of fuel consumption were obtained when special equipment was operated using the example of the KrAZ-6322 car. It is proposed to use deterministic methods for determining fuel consumption in road transport.