Estimating Tire Pressure Based on Different Tire Temperature
Measurement Points 2024-01-5002
Knowing the tire pressure during driving is essential since it affects multiple
tire properties such as rolling resistance, uneven wear, and how prone the tire
is to tire bursts. Tire temperature and cavity pressure are closely tied to each
other; a change in tire temperature will cause an alteration in tire cavity
pressure. This article gives insights into which tire temperature measurement
position is representative enough to estimate pressure changes inside the tire,
and whether the pressure changes can be assumed to be nearly isochoric. Climate
wind tunnel and road measurements were conducted where tire pressure and
temperature at the tire inner liner, the tire shoulder, and the tread surface
were monitored. The measurements show that tires do not have a uniform
temperature distribution. The ideal gas law is used to estimate the tire
pressure from the measured temperatures. The results indicate that of the
compared temperature points, the inner liner temperature is the most accurate
for estimating tire pressure changes (average error 0.63%), and the pressure
changes during driving are nearly isochoric. This conclusion can be drawn
because the ratio between inner liner temperature and tire pressure is nearly
constant, and the pressure can be simulated well using the isochoric gas
law.