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INFLUENCE OF AMBIENT TEMPERATURE AND COLD START ON AUTOMOBILE FUEL CONSUMPTION
O Odsell
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Abstract
Ambient temperature has a significant influence on automobile fuel consumption, both with warmed-up car and during cold start. As a great percentage of all trips made by car covers less than 8-10 km, the cold start fuel consumption is of vital importance for the car owner. However, car manufacturers have during recent years concentrated on lowering the fuel consumption during standardized driving cycles, like cvs, hdc and ece. These cycles do not take into account cold start or driving at low temperatures, and therefore there is still a lot to be done in this field. The report describes how ambient temperature affects fuel consumption with warmed-up car and during cold start. A formula is presented, that can be used to estimate the fuel consumption as a function of ambient temperature and trip length after cold start. Finally some possibilities of reducing the cold start fuel consumption are presented. (TRRL)