Energy harvesting Wheel Speed Sensor

Examensarbete för masterexamen
Master Thesis
Parthasarathy, Dhasarathy
This thesis presents a prototype energy harvesting autonomous sensor, called the Autonomous Wheel Speed Sensor (AWSS), that is targeted for operation in the Electronic Braking System (EBS) of vehicles. In order to monitor the rotational state of a wheel, the EBS currently uses a passive Wheel Speed Sensor (WSS) which is a variable reluctance electromagnetic transducer. In the existing EBS setup, one WSS is used per wheel, each of which is connected to the EBS system using extensive cabling. This project presents the first successful attempt at converting the WSS into an energy harvesting wireless wheel speed sensor or in other words an Autonomous Wheel Speed Sensor (AWSS), which provides information about the rotational state of the wheel to the EBS system over a wireless link. Unlike most wireless sensors which use batteries, the AWSS employs energy harvesting to power itself by simultaneously using the WSS electromagnetic transducer as an energy harvester as well as a sensor. By thus making an autonomous WSS, the amount of cables in the existing WSS assembly can be reduced, leading to savings in material, assembly and maintenance costs. The self-powered prototype AWSS successfully implements periodic wireless transmission of the wheel speed along with near real-time wheel lock detection, at a duty cycle of less than The AWSS has been built using readily available COTS components and uses a proprietary low-power standard for wireless communication. The prototype AWSS implemented in this project successfully demonstrates that the WSS is capable of being used as an energy harvesting transducer. In the experimental setup used in this project, the WSS yields harvestable power of for speed ranges of. This opens up the possibility of using the variable reluctance sensor setup to harvest energy from any rotational assembly and use this harvested energy to power autonomous sensors. This prototype system is intended for operation in AB Volvo vehicle applications and the project is a partnership between Chalmers University of Technology and Volvo Group Trucks Technology – Advanced Technology and Research, Göteborg, Sweden. Keywords: energy harvesting sensor, wheel speed sensor, variable reluctance sensor
Transport , Elektronik , Transport , Electronics
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