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AUTOMOTIVE TESTING: SIMULATION


❱❱ Sensor fusion puts ADAS sensor hardware in the loop for drive simulation software to gain better insight into the behaviour of automated systems, such as emergency braking, at an earlier stage of development


Sensor fusion for accurate simulation


S


imulation is providing opportunities for automotive manufacturers to gain deeper insights into the behaviour of the technology they develop. Rather


than waiting for prototype hardware to drive, the latest driver-in-the-loop (DiL) simulation packages allow drivers to be put behind the wheel before any metal is cut. With vehicle parameters and a variety of


driving conditions profiled into the simulator, there’s a lot of scope for development but with the advent of hardware-in-the-loop (HiL) technology, there’s also the opportunity to incorporate built prototype sub-systems, assemblies or even components within the simulator.


SENSOR FUSION Developments in advanced driver assist systems (ADAS) and vehicle autonomy are placing more sensors into cars and sensor testing is ideally suited to simulation and the use of a range of real world scenarios. For this reason, simulation supplier


VI-grade has partnered with electronics test specialist Konrad Technologies to collaborate on a DiL-with-sensor-fusion- test for verifying ADAS/autonomous driving features at the simulation stage. The sensor fusion element is effectively a


HiL development where the sensor hardware is placed into the simulation loop


Collaborative project provides driving simulator input to hardware-in-the-loop sensors for testing automated vehicle systems


and fed with simulated inputs. Konrad Technologies’ software works


jointly with the simulation software. Objects that are placed around the vehicle by the VI-grade drive simulation software are fed to the Konrad sensor simulators in real time. This becomes the sensor input and the sensor hardware produces an output, which is then brought back into the software simulation to close the execution loop. By using this method, input from the


driver changes the position of objects around the car and varies the input to the hardware in an unpredictable way that isn’t set in algorithms.


TEST EXPO DEMONSTRATION In May this year, VI-grade and Konrad performed a joint demonstration of the new test method at the Automotive Testing Expo and Autonomous Vehicle Technology Expo 2019 in Stuttgart, Germany. Michael Konrad explains that his


company has been working for four years


on pioneering sensor fusion HiL and demonstrating how sensor tests can be combined with HiL tests to validate the performance of multi sensor configurations with ADAS algorithms. “Radar, camera and Lidar sensors can be


tested at sub-system and system level implementations to verify ADAS capability for automated braking, adaptive cruise control, lane departure warning and others. Now we can demonstrate how the sensor test can be extended to DiL with sensor fusion testing so that ADAS functionality can be evaluated and optimised to a higher degree in the lab before beginning road tests,” he explains. According to VI-grade’s vice-president,


Guido Bairati, the company’s driver-in- motion (DiM) 150 simulator offers complete driver behaviour and 9˚ of vehicle movement to simulate a real world drive. “By adding sensors into the drive


simulation loop, ADAS/AD functionality can be tested safely in a lab environment while adding driver reactions to the test parameters for a more comprehensive test that can then be compared with drive test data for optimisation cycles,” he says. The collaborative project with Konrad


Technologies is speeding up the delivery of a link between physical testing and simulation testing for ADAS/AD features to the automotive market. T&TH


June 2019 /// Testing & Test Houses /// 29


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