Road grade estimation for vehicle emissions modeling using electronic atmospheric pressure sensors

Vehicle specific power (VSP) is useful for estimation of vehicle emissions. Previous research has indicated that and emissions are sensitive to variation road grade. Several methods have been used acquisition grade data in earlier studies, but all certain limitations such as insufficient accuracy, complicated processing, or requirements devices not easily available. The objective this study was develop verify a measurement framework based on an electronic pressure sensor. method includes atmospheric using sensors, determination the pressure-altitude relationship meteorological station data, filtering altitude by Fourier transform, calculation combined with onboard diagnostics distance. Road grades calculated were found reliable accurate, which also improved accuracy emission rates calculation.