Abstract
In this paper, the OBD (On-Board Diagnostic) method is used to study the effect of environmental parameters (altitude, ambient temperature) on the actual road NOx emissions and fuel consumption of heavy-duty diesel vehicles. The research results show that the effect of altitude on NOx emissions and fuel consumption is mainly attributed to changes of real-time air intake and combustion in the cylinder. Higher altitude results in increase in fuel consumption, but it is beneficial to reduce NOx emissions. From 10°C to 20°C ambient temperature, the fuel consumption rate is the highest but the NOx emission rate is the lowest. The ambient temperature from 20°C to 35°C creates the conditions for the generation of NOx so causes deterioration of NOx emission, and the oxygen enriched environment is created from -10°C to 10°C so increase production of NOx. The trend of the NOx emission rate and the fuel consumption rate are opposite at different altitudes and ambient temperatures, compared with the fuel consumption rate, the NOx emission rate is more sensitive to the vehicle speed, VSP and rotation speed.
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