- allows data specific to each tire to be compared for inconsistencies within operational parameters
- changes interval times between data updates so it works most when the vehicle is moving and least when it's parked (which reduces battery wear), and
- is capable of automatically identifying individual wheel positions when tires undergo routine maintenance, such as rotation or replacement.
The TMS system utilizes a pressure sensor with a transmitter mounted in the rim flange of each wheel that allows all areas of the surface to be used in the tire mounting process.
Inside the vehicle, a control unit integrated with a receiver and an internal or external antenna gathers and processes the transmitted pressure, temperature and acceleration information and displays it for the driver.
"The tire pressure information can be displayed as a basic dashboard light alerting the driver to a developing situation," says Banas, "Or it can be as detailed as an overhead console readout complete with tire diagnostic data including troubled tire location information."
This system would of course add noticeable cost to a car, which is probably why it's appearing first on something as pricey as the 7-series. With time – and U.S. legislation – TMS and other variations on the tire monitoring theme will move into less expensive vehicles.