The range of electric vehicles determines their suitability for everyday use and acceptance by users. For a steady increase in range, the electric power trains and their components must be continuously optimized. The following example shows how an efficient power measurement in the low-voltage range is carried out. Similarly, such a measurement could also be made in the HV range.
Due to their design, e-scooters offer little space for the drive components. An optimal balance of performance and size of the power train is essential. In this respect, e-scooters are similar to larger electric vehicles that are operated with high-voltage.
In the development of e-scooters, extensive performance measurements must be carried out to optimize the drive. In this example the German company APS-tech had to analyse the power at the battery and the inverter of a commercially avialable e-scooter. The power calculations should be carried out in a road test.
Current and voltage measurement for real-time power calculation.
The measurement technology used should not put unnecessary strain on the drive due to excessive weight and changed driving behaviour, so as not to falsify the measurement results. The inverter works in the e-scooter with a basic frequency of 8 kHz and thus requires measurement technology with a correspondingly high sampling rate. Furthermore, data acquisition and active power calculation during the test drive should be mobile and wirelessly displayed on a monitor.
With this measurement setup the requirements regarding space requirements and measurement data rate could be fulfilled. Thanks to the mobile calculation of the performance directly in the vehicle, the amount of data to be transmitted is reduced. Data losses due to a possible connection break down are avoided. It could also be shown that the HV BM can also be used effectively in 48V electrical systems.
We would like to thank the team of APS-tech for the good cooperation in this project.
Here you find the complete application report for download as PDF.
The HV Breakout Modules (BM) have been specifically designed for safe measurement applications on cables carrying high voltage. Current and voltage are evaluated and the power calculated online in the module.
XCP-Gateway is the interface between the data acquisition software (e. g. vMeasure, CANape®, INCA®, Vision® ...) and the EtherCAT® measurement modules from CSM. It includes an EtherCAT® master and an XCP-on-Ethernet slave.
Swift configuration of measurement chains: CSMconfig is the reliable configuration software for all CAN and EtherCAT® based measurement modules from CSM. The clearly arranged and easy-to-use user interface allows an easy setting of all measurement parameters. This helps speeding up the measurement setup considerably.
vMeasure exp, developed by Vector Informatik, is an easy-to-use software tool for the acquisition and analysis of measurement data that can be used in combination with all CAN- and EtherCAT®-based CSM measurement modules. CSMconfig was integrated directly to ensure swift configuration.