TTTech Auto and Infineon design fail-operational architecture

  • The fail-operational architectural concept enables SAE Level 3 and 4 Automated Driving Systems (ADS) for highly automated driving
  • It allows safe and reliable sensor data processing for highway pilot functions, valet parking and autonomous truck driving
  • Based on a centralized computer architecture, the design lays the groundwork for the future software-based car
  • This joint development successfully completes the € 50 million PRYSTINE research project that includes 60 partners from 14 different countries

Vienna, Austria, October 20, 2021 - TTTech Auto and Infineon Technologies have developed key components for a fail-operational electronic architecture for highly automated driving of SAE Level 3 and 4. This enables the safe and reliable processing of, for example, radar or LiDAR camera sensor data and is targeting car and technology manufacturers. The fail-operational architectural concept and its key components ensure the safe operation of highway pilot functions, valet parking and autonomous truck driving in case individual functions fail.

The joint research contributed to the successful completion of the European PRYSTINE (Programmable Systems for Intelligence in Automobiles) project. With a budget of about € 50 million, PRYSTINE aimed to realize safe automated driving by fail-operational urban surround perception. For three years, about 60 partners worked together in the areas of sensor-fusion, electronic architectures and artificial intelligence coordinated by Infineon.

“With a fail-operational system design, car manufacturers lift the safety of their highly automated vehicle to aviation standard in a cost-efficient manner”, says Stefan Poledna, CTO of TTTech Auto. “This system architecture takes the high safety and reliability requirements of global car manufacturers’ mass-production programs into account. Furthermore, based on a centralized computer architecture, it forms the foundation for the future software-based car.”

“We are developing multicore microprocessors to offer a high-performant, safe and cost-efficient solution for highly automated vehicles,” says Thomas Boehm, Senior Vice President Automotive Microcontroller at Infineon. “Multicore processors provide the necessary processing power, sufficient memory and meet the increasing safety requirements due to the electrification of the car and the advancement of automated driving.”

The design of a fail-operational electronic architecture

The mixed critical approach allows the use of computer hardware and software that run applications of different Automotive Safety Integrity Levels (ASIL). A specially developed failover mechanism consisting of a primary (“Doer” node) and a fallback ECU (“Fallback” node) ensures the necessary fail-operationality for vehicles. In case the “Doer” fails, the “Fallback” promptly takes over within the millisecond range. This mechanism ensures the fail operationality of the system, for example, sensor fusion, trajectory planning and object recognition tasks of SAE Level 3 and 4 functions. The modular concept offers the highly flexible and fast development of Automated Driving Systems (ADS) by enabling the combination of various off-the-shelf elements such as SoCs (System on a Chip), automotive microcontrollers, power supplies, with the deterministic backbone network as well as multiple cameras. This developed architecture represents an ideal setup for a safe electronic architecture to take highly automated driving to the next level. Infineon and TTTech Auto, with the participation of TTTech Group, will continue their collaboration to enable Level 4 and Level 5 automated driving and shape the future of safe autonomous mobility.

PRYSTINE (Programmable Systems for Intelligence in Automobiles) has received funding from the European Union's research and innovation program, Horizon 2020 and ECSEL Participating States via the ECSEL Joint Undertaking  under grant agreement n°783190. This project is funded by the German Federal Ministry of Education and Research as part of the program PRYSTINE (16ESE0329). The Austrian contribution was funded by the BMK (Federal Ministry of Climate Action, Environment, Energy, Mobility, Innovation, and Technology) within the framework of the funding initiative "ICT of the future".



Diagram: failover management mechanism developed under the European PRYSTINE project (Copyright TTTech Auto)

Overview: project partners and contributors

About Infineon Technologies AG

nfineon Technologies AG is a world leader in semiconductor solutions that make life easier, safer and greener. Microelectronics from Infineon are the key to a better future. In the 2020 fiscal year (ending 30 September), Infineon reported revenue of more than €8.5 billion with a workforce of some 46,700 people worldwide. Following the acquisition of the US company Cypress Semiconductor Corporation in April 2020, Infineon is now a global top 10 semiconductor company. Infineon is listed on the Frankfurt Stock Exchange (ticker symbol: IFX) and in the USA on the over-the-counter market OTCQX International Premier (ticker symbol: IFNNY). Further information is available at

About TTTech Auto

TTech Auto provides software solutions as well integration services for the technical challenges associated with the future vehicle generations and their complex electronics systems. The company specializes in the development of the safety software platform for automated driving and beyond, applicable in series production programs. With its leading technology solutions, TTTech Auto ensures safety and electronic robustness for a more automated world. TTTech Auto operates under the umbrella of the TTTech Group, a technology leader in robust networking and safety controls, with cross-industry experience from more than 20 years of operation. The TTTech Group is headquartered in Vienna, Austria and also present in several locations in Europe, the United States and Asia.

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