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Runflat Monitoring
Tyre Pressure Monitoring Systems (TPMS)
A TPMS is designed to ensure the driver is aware of deflated Runflat tyres as they don't show the usual outward signs of a deflated tyre, nor does the vehicle lose stability as it would on conventional tyres. All vehicles fitted with Runflat tyres must have a TPMS. There are two main types of TPMS. The first is a sensor based system that directly measures pressure using a sensor inside the tyre, and sends data to a control unit via radio signal.
(1) Sensor based System (Direct Type)
Advantage: Disadvantage:
Direct measurement of actual pressure
Immediate warning, no delay
Complex system, more servicing required
The second type of system uses the ABS of the vehicle to detect if there are relative differences in the rotation of any of the tyres to identify a deflated tyre.
(2) ABS based System (Indirect Type)
Advantage: Disadvantage:
This system uses available components of the ABS system
Therefore not complicated, easy to service
Actual pressure is calculated not measured
Delayed low pressure warning
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