Improperly inflated tires are fairly common problems on passenger vehicles. In fact, 80% of passenger vehicles on the road have at least one under-inflated tire  and 36% of passenger cars have at least one tire that is 20% or more under-inflated . Often pressure loss in tires is a result of natural permeation of the gas through the elastic rubber, road conditions (such as potholes), and seasonal changes in temperature (According to Weissler of Popular Mechanics, for every drop of 10 ºF, tire pressure drops by 1 psi ). Most vehicle owners are unaware of the fact that their tires are not at the correct pressures because it is difficult to determine the tire pressure visually; a tire that is properly inflated to the correct pressure looks very similar to one that is either over-inflated or under-inflated (Fig 1). According to the Rubber Manufacturing Association (RMA) survey, 80% of people are unsure of how to check their tire pressures. Thus, from the viewpoint of passenger vehicle owners, they are losing money due to increased
tire wear and decreased fuel efficiency, and a solution needs to be found to correct this issue. From the viewpoint of the designers, however, the root cause of improperly-inflated tires is due to vehicle owners not knowing proper tire pressures for certain conditions, difficulty finding an air pump, lack of pressure measuring device, and a general lack of concern. Thus, the combination of the user and expert viewpoints will be used to make decisions in our design process of this product.
Full report available at http://designscience.umich.edu/pdf%20files/APD-2006-07.pdf
Tags : Self Inflating Tyres, Self Inflating Tires technology, Self Inflating Tyres PPT, Self Inflating Tyres PDF, Self Inflating Tyres seminar report.