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Use Cases
Use Cases

Measurement Technology for the Analysis of Electrified Engines

In order to further optimize efficiency and driving comfort, automobile manufacturers are using integrated starter generators (ISG) in mild hybrid vehicles. Fast current and voltage measurements are crucial for the optimal application of this technology. CSM offers the suitable measurement technology to perform measurements with high data rate and also in mobile testing.

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Background

In mild hybrid vehicles, powerful starter generators are used between the combustion engine and the transmission, taking over the functions of the classic starter and alternator. They are capable of accelerating the combustion engine as well as feeding electrical energy recovered via recuperation back into the vehicle battery. Especially during the starting process, currents must be measured at the input for the optimal design of the ISG.

Measurement task

Current measurement for optimizing the integrated starter generator.

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Challenge

Currents of up to 300 A flow in the 48 V vehicle electrical system, which can be much higher for a short time during starting. These peaks also have to be recorded with a high resolution, which means that the measurement technology used must above all allow high data rates and installation for mobile measurements.

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The CSM-solution

  • A LEM sensor package is used on the lines between the 48 Volt battery and the ISG inverter, which offers a measurement range of ±500 A and a bandwidth of up to 200 kHz. This means that even the current peaks that occur can be acquired with high resolution.
  • A measurement module AD4 MM type IG1000 acquires the data of the LEM sensor package.
  • The protocol converter XCP-Gateway converts the data into the common XCP-on-Ethernet protocoll and serves as an interface to the data acquisition software. In this case vMeasure exp from Vector Informatik is used.
Comparison of measurement results and sensor data
The comparison of the measurement results of the sensor package (green curve) with the integrated sensor (white curve) clearly shows the difference in resolution.
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Benefits

With the high sampling rate, the joint solution of CSM measurement modules and Vector software allows a precise analysis of the current peaks that occur and of the power. Vector CANape makes it easy to integrate additional measurement data from ECUs, for example, into the measurement.

Download

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

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