Wireless Diagnostic Tool for Electric Vehicles with Synchronized Data Acquisition: Development of a Multi-Purpose Wireless Sensor System
Daniel Breuer, Philip Karl-Heinz Dost, Constantinos Sourkounis · 2017
This paper describes a sensor system, that can measure the physical variables voltage, current and temperature, as well as others if required. This makes the system an ideal diagnostic tool for all kinds of electrical power supplies, especially for use in electric vehicles. To maintain maximum flexibility, all sensor units communicate via a wireless local area network (WLAN) connection and are synchronized by the same means. A synchronized data acquisition works with a sampling frequency of up to 8 kHz. A mobile power supply in form of lithium-ion cells are compactly housed together with all required measuring equipment, a powerful microprocessor and a micro SD card for storing data of up to 32 GB locally. As a result of the low volume requirements, the sensor units can be used in tight spaces. The lithium-ion cells grant a continuous data-stream for 40 hours. The measured values have an accuracy of 16 bit and are streamed in real-time into a WLAN network. To this end, a suitable app was developed in parallel to view the streamed data. Triggers for start and end time of a single measurement can be defined via a user interface. The configuration, such as sampling frequency and wireless connection data can be updated wirelessly. The sensor units are equipped with multiple additional communication interfaces, such as SPI, I2C, 1-Wire and CAN. During the entire hardware- and software development special attention was paid to high flexibility, extensibility and performance. WiSe is an attractive wireless diagnostic system for every user group with high flexibility and comfort requirements. This paper indicates that the developed wireless sensor system is a good alternative to conventional measuring equipment with the advantage of the lack of wires, and therefore potential free measurement by nature and easy usage.