Tyre pressure monitors keep working indefinitely
A
Morgan Electro Ceramics product story
Edited by the Engineeringtalk editorial team
Mar 28, 2008
The movement of the wheel and pressure of the tyre as it hits the ground causes the bimorph to bend and undergo stress, which is then transformed into electrical energy.
Morgan Electro Ceramics has developed a piezoelectric bimorph suitable for use in automotive tyre pressure monitoring systems (TPMS).
The piezoelectric bimorph enables TPMS manufacturers to design self-energising (battery-less) remote sensors that accurately measure tyre pressure, with none of the lifetime and disposal issues associated with batteries.
The movement of the wheel and pressure of the tyre as it hits the ground causes the bimorph to bend and undergo stress, which is then transformed into electrical energy.
The bimorphs generate enough electrical energy to power a wireless signal that transmits data about the pressure in the tyre to an on-car receiver.
It is now mandatory in the USA for all new cars to have a tyre pressure monitoring system installed, according to Ian Edwards, General Manager, Morgan Electro Ceramics, Ruabon.
This has been driven by safety concerns, related to under inflated tyres, but also affects fuel efficiency and tyre life expectancy.
At the moment batteries are used to power the sensor and wireless transmitter, but they have limited lifetimes.
The piezo bimorphs provide reliable performance that will last the life of the vehicle and reduce both costs and waste.
Piezoelectric bimorphs also support the development of an intelligent TPMS, capable of collecting more data about the tyre and road conditions and communicating with other systems within the vehicle.
The piezoelectric bimorph component is available in sizes from 15 to 45mm in length and 2 to 15mm in width and can be designed and manufactured to meet custom specifications.
The bimorph component can be secured and encased in a plastic housing for installation within the tyre along with the provision of electrical contacts for easy integration with electronics.
The piezoelectric properties of Morgan Electro Ceramic's material make it ideal for use in transducers and sensors.
It can be found in automotive applications such as parking aids, wheel balancing, engine knock sensors and ignition systems.
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