Skip to main content
Use Cases
Use Cases

WLTP Power Measurement of Electric and Hybrid Vehicles

In the European Union, consumption values for new passenger cars and light commercial vehicles must be measured for type approval according to the WLTP (Worldwide Harmonized Light-Duty Vehicles Test Procedure). This also applies to electric vehicles (battery electric vehicles and hybrid electric vehicles), for which the electric range is also determined. This example shows how the electrical energy consumed and the range per charge can be determined according to the WLTP.

Icon Background


For the WLTP, specific driving cycles (WLTC - Worldwide harmonized Light vehicles Test Cycle) were defined in which the respective measurements are carried out. These driving cycles specify certain speed profiles that are intended to provide a more realistic picture of the energy consumed than previous tests.

Driving cycles are performed on test benches until the HV batteries are discharged. This makes it easy to determine the range for battery electric vehicles. For plug-in hybrid vehicles, the electric range is determined in relation to the total range: The last cycle run is completed with the battery completely discharged and the amount of energy required for complete charging is then measured. Based on the amount of energy consumed and the range driven, the energy requirement can be calculated in kWh/100km.

Measurement task

Current and voltage measurement for analysis of the energy consumed and range determination in defined driving cycles.

Icon Challenge


For precise analyses, the currents and voltages must be recorded with high temporal resolution. However, it is not possible to determine consumption directly from the raw data - ideally, the energy must first be calculated in real time according to the speed specified in the WLTC. Once the values have been determined on the test bench, it should also be possible to check them easily in real test drives.

Drive cylce WLTC Class 3
Drive cycle according WLTC class 3
Icon Solution

The CSM-Solution

The solution for this measurement task is found in the perfectly harmonized Vector CSM E-Mobility Measurement System, which combines precise measurement modules and powerful software.

  • A HV Breakout Module (HV BM) 3.1 measures current and voltage between the charging station and the On-Board-Charger (OBC) at a data rate of 1 MHz and 100% synchronous. For this purpose, the HV BM is simply inserted in the power cables. In this way, the amount of energy consumed when recharging the battery can be determined.
  • Current and voltag between the battery and the inverter are measured with a HV Breakout Modules (HV BM) 1.2. This module also allow phase-accurate measurements with data rates of up to 1 MHz.
  • A XCP-Gateway 4S pro collects the data of the HV breakout Modules. The EtherCAT® signals are converted to XCP-on-Ethernet with up to 1 GBit/s.
  • With the eMobilityAnalyzer, the energy is calculated in real time during the drive cycles and during the charging process. In the function "DCAnalysis" the working power P and the cumulative consumption W are calculated. The "ChargerEfficiencyAnalysis" function is also used to determine the losses from the charging process.
WLTP Measurement in E-Mobility Measurement System
Presentation of the WLTP power measurement in the systematics of the Vector CSM E-Mobility Measurement System
Speed profile for the class- 3 driving cycle (green), current I (red) and battery voltage U (blue)
Speed profile for the class- 3 driving cycle (green), current I (red) and battery voltage U (blue)
Power P (red) and energy consumption W (green) of a plug-in hybrid vehicle according to WLTP drive cycles
Power P (red) and energy consumption W (green) of a plug-in hybrid vehicle according to WLTP drive cycles
Icon Benefits


With the Vector CSM E-Mobility Measurement System, the electrical consumption values can be easily determined - on the test bench and in road tests. The direct measurement of current and voltage in the HV lines also increases accuracy and enables precise analyses. The measurement setup is also extremely compact, which saves time for setting up the measurement chain.

Related Products

Related Hardware

Hochvolt Breakout-Module zu Leistungsmessung

HV Breakout Modules

Direct measurement of current, voltage and power

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.

Read more


The protocol converter for EtherCAT® and CAN to XCP-on-Ethernet

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.

Read more
E-Mobility Measurement System

The Vector CSM E-Mobility Measurement System

The measurement system for the development of electric mobility

E-Mobility: Sicher messen an Hochvolt-Komponenten von Elektro- und Hybrid-Fahrzeugen Electromobility continues to gain momentum. Various energy storage, drive and charging systems pave the way to electric mobility. The development of high-voltage batteries, inverters and electric motors places high demands on measurement technology in order to obtain the right results for further optimization. Together with Vector Informatik, CSM has developed a measurement system that leaves nothing to be desired.

Read more

Related Software

Software CSMconfig

Logo CSMconfig

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.

Read more
vMeasure exp

vMeasure exp

Reliably Solving Complex Measurement Tasks

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.

Read more