The air pressure in the tires of a vehicle affects its stability, handling and braking and may contribute to causing an accident. Under-inflated tires increase fuel consumption. Existing measurement systems for the monitoring of the tire pressure use active sensors which need a battery or bulky energy transmission. This work shows a new approach: quartz crystals as sensors can operate passively, without energy supply, by giving an echo to a stimulus pulse. Strain influences the otherwise extremely stable natural frequency of a quartz crystal which is therefore ideally suited for pressure measurements. As the natural frequency lies in the MHz range, stimulation and response can be transmitted by a pair of small antennas. A wireless measurement system has been built with excellent accuracy and resolution and a lightweight sensor which is very reliable and in principle maintenance-free.
Wireless measurement of tire pressure with passive quartz sensors
1999
9 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
Wireless measurement of tire pressure with passive quartz sensors
British Library Conference Proceedings | 1999
|The 'intelligent tire' utilizing passive SAW sensors measurement of tire friction
Tema Archiv | 1999
|Wirelessly Interrogable Passive SAW Sensors, Application for Permanent Monitoring of Tire Pressure
British Library Conference Proceedings | 1997
|Warning method adopting tire pressure sensors and warning system adopting tire pressure sensors
Europäisches Patentamt | 2015
|