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Vienna-based TTTech Automotive, a subsidiary of TTTech and specialist for safety controls and reliable networking, as well as manufacturer of electronic control systems for electric vehicles, has developed a monitoring unit for safety-related electric drive systems. Volvo Car Group had chosen the Inverter Safety Unit (ISU) from TTTech for the innovative first and second generation Volvo C30 Electric, produced between 2011 and 2013.
Full control of the enormous torque generated by the electric motor is – also in case of failure – of crucial importance, due to the typical lack of a possibility to interrupt the power flow mechanically. TTTech’s ISU uses a special sensor system and innovative algorithms to calculate the actual torque and to detect errors independently that could cause safety goals to be breached. If the deviation between the target and the actual torque becomes too big, the safe state of the electric power train is entered through internal and external shut-off paths. The ISU can be integrated into the power train as a self-contained monitoring unit or into the inverter itself.
Volvo Car Group had chosen this advanced safety control unit from TTTech for the second generation of the Volvo C30 Electric. "This car shows clearly that there must not be any compromise in terms of driving pleasure, comfort and of course safety compared to petrol powered cars," says Lennart Stegland, Vice President Electric Propulsion Systems at Volvo Car Group. "We have chosen the TTTech solution because the company's safety know-how was the perfect fit for our goal to make the Volvo C30 a role model for e-mobility."
"We are delighted that TTTech provided another significant contribution to the safety of electric cars," states Marc Lang, Director Sales & Marketing, TTTech Automotive. "The intrinsic safety of the inverter plays a central role in the safe overall system of the C30 Electric. We are looking forward to continuing our successful cooperation with Volvo in future projects."