all possible input variations through a long list of test scenarios. This list continues to expand with each new consumer-driven innovation, forcing automotive OEMs and their suppliers to determine how to perform repeatable, real world testing. On top of this is the complexity introduced with
the electrified powertrain, consisting of the motor, inverter and battery. With each component experiencing significant innovation to improve efficiency and the driving experience, the testing demands are constantly changing. By employing simulation techniques, hardware-
in-the-loop systems provide an efficient, repeatable and viable method that engineers can apply to accomplish their exact test needs while minimising costly and potentially dangerous road testing. Historically, these needs have been met with custom, closed-test systems designed from the ground up for each unique set of customer requirements or put together by internal test teams that have to integrate components from several different test vendors. By adding ADAS to its test coverage, NI and
ETAS are addressing an important part of automotive development that is part of the UN remit for improved road safety and also paving the way for the future of autonomous road transport.
which enables us to maintain our focus on cutting- edge HIL technologies,” he says. The collaborative approach taken in HIL testing
development also extends to other industry participants such as MathWorks for model integration using Simulink and ETAS for pre-configuration expertise. The notion of
hardware-in-the-loop relies on the ability to have a simulation and
test system into which prototype as well as production
hardware can be simply plugged so that real hardware can be fully tested in virtual environments.
ADAS VALIDATION The joint venture with ETAS has resulted in ETAS NI Systems, which combines ETAS’ expertise in developing and integrating HIL systems with NI’s software-defined platform and comprehensive I/O capabilities. The pre-integrated systems will be able to be
quickly configured from a common infrastructure to meet each customer’s specific needs, and being built on the NI platform means the added ability to economically change the tester over time to keep pace with technology changes. As well as EV testing, the joint venture will
examine the validation of the operation of advanced driver assist systems (ADAS) in vehicles. ADAS has proven to be a notoriously difficult system to test in
RADAR FOR ADAS Automotive radar is essential to vehicle safety for current ADAS and future autonomous driving. It’s one of the most widely used sensing technologies because it is robust and readily available. The massive automotive industry shift towards 79GHz radar has reduced the cost of radar-based safety features, such as autonomous emergency braking (AEB) and rear cross-traffic alert (RCTA). The main advantage of 79GHz radar sensors is
the 4GHz bandwidth, which significantly improves resolution and accuracy for both range and velocity. A trade-off, however, is a larger set of test challenges, as the additional bandwidth means more data. This requires additional processing capabilities and an increase in test scenarios as more objects are discernible. With the simulation capabilities of the Vehicle Radar Test System (VRTS) developed by NI, engineers can work to improve their test to more confidently address these challenges. “4GHz is more than just larger bandwidth and
extra scenarios,” says Oliver Poos, radar test engineer at Noffz Technologies. “It provides added room for error on the test, so reliability and repeatability are increasingly important to guarantee safety.” NI’s new VRTS is capable of simulating two
objects per angle with a highly repeatable radar cross section (RCS). The RCS makes the simulated obstacle appropriate for both validation and production test. As part of the overall NI platform, the VRTS benefits from the flexibility, scalability and cost-effectiveness of the company’s software-defined systems, helping the user create more precise test scenarios and achieve lower test set-up times. Finally, the VRTS is both cost- and space-optimised for large production deployments. T&TH
December 2019 /// Testing & Test Houses /// 27
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