Development of a Tire-Pressure-Monitoring-System Demonstrator for Bluetooth communication

OData support
Dr. Takács Gábor
Department of Electron Devices

A Tire-Pressure-Monitoring-System (TPMS) is mandatory in the USA since 2007 for all new cars, as well as in the EU since 2014. A TPMS is responsible of observing the tire-pressure of each wheel, which is achieved by having a sensor directly placed in each tire. Such sensor measures the pressure by an integrated microelectromechanical system (MEMS), converts and compensates the acquired data by its integrated microcontroller, and finally transmits the data wireless via the 315/434 MHz Industrial, Scientific, and Medical (ISM) band to a receiver being installed somewhere else in the car. Nowadays, there is a trend in the sector to increase connectivity in order to support the future of the smart cars, and this concerns especially wireless sensors and actuators such as the TPMS or the key fob. Today, a typical car key used for remote keyless entry (RKE) is also transmitting data wireless via the 315/434MHz ISM band to the same receiver as TPMS does. One idea is to replace that key by a smartphone application, which means that the interface for RKE would have to be replaced with a new one, as smartphones don’t support the 315/434MHz ISM band. A possible solution could be to use the Bluetooth Low Energy (BLE) protocol, as it is supported by every modern smartphone. This option implies that also TPMS would have to switch to the new interface as the same receiving unit shall be used for both TPMS and RKE for cost-saving potentials. The aim of this thesis is to find out the possibilities and technical issues of a TPMS using Bluetooth, create a demonstrator for a TPMS using Bluetooth, and investigate the capabilities and limitations of this solution. Main activities of this thesis are:

• Present the state-of-the-art of Bluetooth TPMS based on literature review.

• Combining these requirements with the Bluetooth standard as well as picking out of existing Bluetooth Integrated Circuits (ICs) suitable for TPMS.

• Design a concept for using a selected Bluetooth IC together with Infineon’s most recent TPMS IC.

• Identifying the pros and cons of this solution compared with the current solution using the 315/434MHz band.

• Developing and constructing a functional demonstrator showing the usage of Bluetooth together with an Infineon TPMS IC.

• Optional: Developing an App for iOS/Android which can receive and display the data on a smartphone.


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