Abstract:

A method based on OBD system was established for real-time on-board monitoring of gasoline
vehicle fuel consumption. The different types of vehicles for on-board diagnostic (OBD) real-time parameters
was analyzed. Based on the adaption analysis results, according to the principle of air / fuel ratio (AFR) of
gasoline engine, 4 kinds of calculation methods with the same principle for gasoline vehicle real-time fuel
consumption were established. For a small portion of vehicles with low adaptation, the OBD system can’t obtain
the parameters to calculate the gasoline vehicle fuel consumption. For this type of vehicles the method of
parameter calibration was proposed. The vehicle experiments were carried out, in order to validate correctness
of this kind of methods. The result show that such fuel consumption monitoring method can be used for the
vast majority of gasoline vehicles for real-time on-board fuel consumption monitoring, the instantaneous fuel
consumption error is within ±8%, the instantaneous fuel consumption per 100 kilometers error within ±3%.

Key words: gasoline vehicles, on-board diagnostic (OBD), real-time on-board monitoring, fuel consumption, air fuel ratio (AFR), parameter calibration