ANALYSIS OF THE ROLE OF ALTITUDE AND TEMPERATURE ON THE PERFORMANCE OF THE IGNITION INTERNAL COMBUSTION ENGINE USED FOR LIGHT VEHICLE PROPULSION
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Abstract
This paper presents the impact that altitude has on the performance of a spark ignition combustion engine. In order to obtain the results, ten different models of vehicles widely used in the Andean region of Latin America were analyzed, the same ones that, during three years, were instrumented in such a way that they can be obtained at the rate of one reading per second, data referring to the engine operation, vehicle dynamics and emissions generated into the environment, in a wide altimetric range between 0 and 4500
m.a.s.l. In addition, data on environmental conditions were collected in such a way that the analysis of the impact of altitude can also be extended to factors such as environmental temperature. Although operating simulators are developed where the pressure and temperature parameters are modified under international regulations, ISA, the results come from real driving conditions, which gives a significant reliability advantage over the data obtained. Furthermore, directives of the European Commission require approval of the emissions generated at different altitude conditions, hence the importance of having a baseline regarding the real effect of altitude on performance and emissions. In particular, there is an apparent increase in vehicle emission readings in high-altitude conditions, which emphasizes the need for strategies to reduce emissions in high-altitude operations.
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