PT - JOURNAL ARTICLE AU - Čupera, Jiří AU - Havlíček, Miroslav TI - Alternative methods of fuel consumption metering based on the on-board diagnostics outputs DP - 2014 Dec 25 TA - Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis PG - 23--32 VI - 53 IP - 4 AID - 10.11118/actaun200553040023 IS - 12118516 AB - The article describes alternative methods of fuel consumption measurement based on model with using the diagnostic outputs of engine control unit. On-board diagnosis (the second level, known as OBD-2) has been mandated by government regulation because of advanced damage control systems in newer cars. However, its signals can be used for accurate analyses of power or torque measurement. On-board diagnostics offers many various parameters such a spark advance, intake air temperature, coolant temperature, throttle position, air flow mass and so on. Many of them have been unavailable without using sophisticated and expensive instrumentation. In the article are described two ways of fuel consumption measuring which are based on intake air consumption and knowledge about air-fuel ratio. First of them is founded on voltage output of oxygen sensor, the second on short (long) term fuel trim. As is shown at the end the second way gives more accurately results.