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Use Cases
Use Cases

Power Measurement on an E-Scooter

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.

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Background

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.

Measurement task

Current and voltage measurement for real-time power calculation.

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Challenge

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.

Installation of the measurrement equipment
The HV BM are inserted directly into the power cables
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The CSM-solution

  • The HV Breakout Module (BM) 1.1 is inserted directly into the power cable for single-phase measurement of current and voltage between battery and inverter.
  • The HV BM 3.1 measures current and voltage between inverter and electric motor in three phases. Spontaneous processes in the lines can be monitored with the instantaneous power, which the HV BM calculates online.
  • The XCP Gateway basic converts the measurement data to XCP-on-Ethernet and ensures the synchronization of the connected measurement modules.
  • With a Mini PC, the measured data is recorded and the active power of the battery and inverter is calculated in real time. The eMobilityAnalyzer for vMeasure exp and CANape from Vector Informatik is used for this.
  • Via WLAN the performance data are transmitted to a spatially separated monitor and displayed.
HV BM installed in power cables
No further sensors or measuring modules are required.
Installation of the measurement equipment in the trailer
The entire measurement technology is installed in a trailer.
Display of the measured values
The power values calculated online are displayed on a spatially separate monitor.
EScooter at the driving test
The e-scooter in a driving test
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Benefits

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.

Download

Here you find the complete application report for download as PDF.

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