Tyre Pressure Monitoring System

Tyre Pressure is one of the most forsaken aspects when it comes to automobile maintenance, but it is also essential to ensure it for safe driving. Tyre Pressure Monitoring System or TPMS now comes in an array of vehicles to reduce the driving risks.

The objective of the Tyre Pressure Monitoring System in the vehicle is to warn you that at least one or more tyres are significantly under-inflated, possibly creating unsafe driving conditions. TPMS sensors in the vehicle show a warning light when tyre pressure drops to 6-7 PSI. The TPMS low tyre pressure indicator is a yellow symbol that illuminates on the dashboard on the instrument panel in the shape of a tyre cross section (that resembles a horseshoe) with an exclamation point.

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History Of Tyre Pressure Monitoring System –

No doubt this indicator has now become a standard feature in the manufacturing of automobiles, there’s a bit of history behind that indicator light in your car. Let’s rewind to the year, 1977 when it was first fitted in Porsche 911. Later, it was adopted by Renault too. Tyre Pressure Monitoring System became widely recognised in the UK and Europe when EU passed a law in 2009 making it mandatory to have TPMS as standard.

Over a period of time, it has become a life saver as now many lives can be saved because drivers now can know the accurate tyre pressure. Proper maintenance with the aid of a TPMS can help prevent many serious accidents that happen all over the globe.

How Tyre Pressure Monitoring System Works?

Contrary to what you may think, not every TPMS works the same way. The illumination of the low tyre pressure indicator represents the final step in the process of either an Indirect TPMS or a Direct TPMS.

1 – Indirect TPMS – This one relies on wheel speed sensors that the anti-lock brake system uses. These sensors measure the rate of revolution each wheel is making and can be used by onboard computer systems to compare with each other. Based on the rate of revolution of each wheel, the computer can interpret the relative size of the tyres on the vehicle. When a wheel starts spinning faster than expected, the computer calculates that the tyre is underinflated and alerts the driver accordingly.

The advantage of this system is that it is relatively inexpensive as compared to a direct TPMS. However, the drawback of this particular type of TPMS is that it may become inaccurate if one purchases a bigger or smaller tyre. Moreover, it requires resetting after the routine tyre rotation.

2 – Direct Tyre Pressure Monitoring System – This one uses pressure monitoring sensors within each tyre that monitor specific pressure levels, not just wheel revolution data from the anti-lock brake system.

Sensors in a direct TPMS may even provide tyre temperature readings. The direct Tyre Pressure Monitoring System sends all of this data for analysis. If tyre pressure is lower than it should be normally, then it transmits the data directly to your dashboard where the indicator light illuminates. The unique thing about Direct TPMS is that each sensor has a unique serial number through which the system distinguishes among pressure readings for each individual tyre.

Advantages of Direct TPMS includes that it deliver the actual tyre pressure readings from inside the tyre, not prone to inaccuracies, has simple resynchronisation. While its disadvantages include that it is more expensive than Indirect TPMS, resynchronization may require costly tools, installation and service are confusing for consumers as well as auto shops.

In the end, we can conclude that although the methods may be different, both the systems serve the same purpose and activate the same indicator light. Even though a TPMS can deliver accurate alerts when properly maintained, it’s not a replacement for manual air pressure checks.

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