Tire Pressure Monitoring Sensor (TPMS) as a key factor to:
- Increase fuel efficiency
- Avoid unnecessary tire wear
- Keep passengers’ safety
- Mandatory in most countries
Current design intent in most automotive applications is chemical batteries which have the following drawbacks:
- High maintenance cost as just in the US, 40 million/year batteries are newly introduced due to harsh operation condition with cost of more than $320M/year.
- Environmentally harmful.
- Hazardous/toxic components from “Lithium Thionyl Chloride chemistry”.
- Explosive at higher temperature
CONCLUSION / FUTURE WORKS:
1). Thin strap type EH device for TPMS
Magnet-shielding layers: reduction of current cancellation
3.05mW power generation (200 rpm or 25 km/h)
Thin and compact design
Durable design: no material deformation / contact / wear
2). Elimination of eddy current
Nonconductive/nonmagnetic material.
Plastic / composite
Rim shape change to hinder eddy current flow
Magnet size reduction
200~250W (power requirement) vs. 3.05mW (this study)
3). Prevention of contamination by steel particles
Design optimization of magnet shape to reduce contamination considering electromagnetism and fluidics
For Further information contact: sblee@umbc.edu or a.giles@smart-material.com
Amazing! You know I love your blog!!!