High precision measurement tech features in Formula E racing series

As an accredited technology partner of the Fédération Internationale de l’Automobile (FIA), Isabellenhütte has demonstrated its expertise in a high performance environment with the shunt-based IVT-F measurement system developed specifically for formula racing. The IVT-F used in all Formula E race cars is responsible for measuring the charge and discharge volumes of the battery units.

These achieve high energy densities when high voltages are applied. This is why the isolation electric strength of the measurement sensors must be correspondingly high. It is a key quality feature that distinguishes the IVT measurement systems.

The shunt-based IVT-F measurement system is a custom-made production for the FIA. The device must meet elementary physical and technological framework conditions due to the regulations. In the racing trim, the sensor system used must be extremely precise and highly insulating. With a plastic potting that surrounds the IVT-F, the standard insulation used from the standard product IVT-S, which is between 600-800V, is therefore additionally amplified.

In this way, the IVT-F achieves a real isolation electric strength of 1,000V. The linearity, the custom-made electronics, the quick sampling and the calibration realise a precise measurement.

The heat generated while racing is countered by the IVT-F with a high temperature resistance. The system designed from resistant special materials has a low temperature coefficient. It protects the IVT-F from malfunctioning. The system ensures precise measurement results up to an operating temperature of +105°C. A microcontroller monitors the sensor status in order to meet the safety requirements.

As with the standard product IVT-S, an AD converter in the IVT-F also ensures a precise transformation of the voltage drop into digital signals. A CAN bus interface was installed for the data transfer. It ensures the communication between IVT-F and the battery control unit.

“Our series products and our customers benefit from our success in Formula E," said Athier Lafta, Product Manager for Precision Management at Isabellenhütte. With the knowledge gained in Formula E regarding improved insulation electric strength, Isabellenhütte also developed the series measurement technology IVT-MOD further and launched its successor IVT-S.

"In order to meet the increased requirements of car manufacturers, including requirements for increased system voltage."