Drive over tyre pressure check
Discussion
If this works like it says what a great idea....
http://www.bbc.co.uk/news/technology-25457598
Modern technology at its best.
http://www.bbc.co.uk/news/technology-25457598
Modern technology at its best.
2 principal options i suspect
1) Capacitive or Resistive pressure pad, to record the "footprint" of the tyre. Calibrated for properly inflated tyres, and over a certain threshold area the system flags a warning
2) Vertical high bandwidth pressure sensor records the profile of the "impact" with the pad. An inflated tyre has a higher fundamental frequency than a flat one
I could see a use for commercial vehicles, but completely pointless for passenger cars that already have such systems fitted onboard. (Also, modern runflats will probably make such devices highly inaccurate)
1) Capacitive or Resistive pressure pad, to record the "footprint" of the tyre. Calibrated for properly inflated tyres, and over a certain threshold area the system flags a warning
2) Vertical high bandwidth pressure sensor records the profile of the "impact" with the pad. An inflated tyre has a higher fundamental frequency than a flat one
I could see a use for commercial vehicles, but completely pointless for passenger cars that already have such systems fitted onboard. (Also, modern runflats will probably make such devices highly inaccurate)
A really nice piece of work, but it must have a fairly big margin for error, considering firstly probably the technology used and the potential variables of vehicle loading, temperature etc (I don't know that of course), but secondly (and this we do know) the fact that the vehicle has presumably driven to the measurement station, and therefore you're measuring hot pressures, which is fairly limited for an accurate measure. The best way would still be to measure and set them cold. Useful for spotting punctures, but to make a passenger car drive well you'd still need to do it properly.
Blue Oval84 said:
Do tyres really heat up in a couple of mile drive to the petrol station? My tyres are always stone cold to the touch when I get there, surely measuring the pressures at 7am vs 12pm would have a MUCH bigger effect on the pressure reading?
Not much. It depends how anal you are about tyre pressures (I'm very 
) Some manufacturers recommend from cold which could be 20C and others recommend from 0C. I have a calibrated gauge and can see differences in pressure from the sun shining on one side of the car and heating the tyres up.
from what I've seen.RobM77 said:
A really nice piece of work, but it must have a fairly big margin for error, considering firstly probably the technology used and the potential variables of vehicle loading, temperature etc ....
Very straightforward in conjunction with ANPR. When used for a fleet of vehicles at a depot, as in the case described, a computer can be programmed with the "ideal" characteristics for each vehicle. That data is used to compare with the actual characteristics when the vehicle is driven over the plate and the answer calculated/displayed. Simples. website said:
RightStrip™ is attached to the road surface, the arrival of a vehicle is sensed magnetically and the impact of each of the wheels on the RightStrip™ is recorded and uploaded wirelessly to the internet. Data is subsequently analysed and tyre information is sent to the driver via SMS.
Sounds like force is measured, and a clever algorithm used?Looks like they are working on adding some measurement of the side profile... scan with a laser, camera vision system??
http://www1.aston.ac.uk/business/grow-your-busines...
Edited by Glade on Saturday 4th January 10:56
I'd also be interested to understand how it works and how it knows what the correct pressure should be.
For my X5, there is a massive variation in the allowable pressure depending on the size of wheel fitted and load being carried. The minimum pressure is 29 and the full loaded pressure is 38.
On my 993 on 18" wheels the front pressure is 36 and the rear is 44. On 17" the rear is 36.
I guess it's designed to look for significant underinflation due to a puncture more than anything else. It might be a useful thing to have on the entrance to motorway service stations.
For my X5, there is a massive variation in the allowable pressure depending on the size of wheel fitted and load being carried. The minimum pressure is 29 and the full loaded pressure is 38.
On my 993 on 18" wheels the front pressure is 36 and the rear is 44. On 17" the rear is 36.
I guess it's designed to look for significant underinflation due to a puncture more than anything else. It might be a useful thing to have on the entrance to motorway service stations.
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