Evaluation of the accuracy of measuring fuel consumption based on information from the on-board CAN bus of the car

Abstract

Determining the actual fuel consumption of car engines is a prerequisite for the efficient operation of road transport. One of the methods for determining fuel consumption that does not require significant costs associated with integrating additional control devices into the fuel system of cars is to use information about the instantaneous fuel consumption available in the on-board CAN bus of the car. As a result, the issue of assessing the accuracy of this method becomes relevant. The paper compares the integral values of fuel consumption obtained in two ways: according to information from the on-board CAN bus of the car and by the mass method. The Lada Kalina 2 car with the VAZ-21126 engine was used as the object of study. The research was carried out on a dynamometric hub test bench Dynapack DAQ+ V43, which made it possible to set various stationary load modes of the engine. In the course of the study, the following tasks were accomplished: identification of the on-board CAN bus package of the car containing information about the instantaneous volumetric fuel consumption, creation of a software and hardware complex based on the CANNY 7 logical programmable controller and a personal computer, which allows monitoring and recording the fuel consumption value obtained from the CAN bus, creation of a mass fuel flowmeter. As a result of the research, it was found that the integral values of fuel consumption obtained from the on-board CAN bus and by the mass method differ. The discrepancy ranges from 18,6% to 23,6% for different load modes. Thus, the method of determining the actual fuel consumption based on information from the on-board CAN bus of the car may have relatively low accuracy, which must be taken into account when using it in practice.