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| 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. |
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| (1) Sensor based System (Direct Type) |
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| Advantage: |
Disadvantage: |
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Direct measurement of actual pressure |
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Immediate warning, no delay |
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Complex system, more servicing required |
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| 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. |
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| (2) ABS based System (Indirect Type) |
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| Advantage: |
Disadvantage: |
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This system uses available components of the ABS system |
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Therefore not complicated, easy to service |
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Actual pressure is calculated not measured |
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Delayed low pressure warning |
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