ESTIMATION OF THE ACCURACY OF FUEL CONSUMPTION MEASUREMENT BASED ON DATA FROM THE ON-BOARD CAN-BUS

Abstract

Determining the dependence of actual fuel consumption on operating conditions is the most important task in vehicle transport, since the cost of hydrocarbons is a significant part of the cost of transportation. Currently, there are many ways to experimentally measure fuel efficiency: using external flow meters installed in the fuel line, equipping the tank with additional level sensors, using information from the electronic engine control unit. The latter approach is of greatest interest, since it requires minimal financial investment, is easy to install, and there are no significant changes to the design. The question arises about the measurement accuracy according to this method, since the ECU calculates the fuel consumption according to a mathematical model, calibrated and programmed at the factory. This article offers a solution to this problem. At the first stage, NNSTU specialists have developed and installed on a vehicle equipment for measuring fuel consumption simultaneously by two methods – using an external high-precision Kistler Dfl3x-5bar flow meter, installed in the fuel line, and on the basis of data from the engine ECU, obtained using information CAN-bus. At the second stage, tests were carried out (moving in a steady state and the driving cycle) after this, using results of tests, we have concluded a numerical difference in the methods for determining fuel consumption. At the end of the article, tabular results of comparison of measurements and graphs of the determined parameters are demonstrated.