Vehicle-in-the-Loop setup for ADAS or autonomous driving function tests using over-the-air stimulation.
Automated driving will soon be a mandatory part of every new vehicle, and autonomous driving is no longer a distant vision of the future. In order to ensure the safety of automatic driving functions today as well as autonomous driving tomorrow, Dürr has created the x-proof 360 essential setup for Vehicle-in-the-Loop tests of ADAS/AD functions by combining over-the-air stimulation and two of our cutting-edge products:
The multi-function roll test stand with steering capability offers all conventional features of a roll test stand and allows the vehicle to not only drive forward, but to perform cornering maneuvers as well.
The multi-axial positioning system for dynamic scenarios offers full flexibility and precise positioning for over-the-air stimulation equipment, even in case of dynamically movable objects in front of the vehicle.
By synchronizing the real test vehicle behavior and simulated object movements with a virtual driving environment using over-the-air stimulation, the x-proof 360 enables tests of various ADAS and autonomous driving tasks.
Sensor stimulation over the air is carried out for, e. g.:
Via a monitor or screen and a connected virtual driving environment simulator. The visualization, statically placed in the sensor’s field of view by the x-around, can dynamically display any kinds of road markings, objects or courses for the camera. The movements of the virtual vehicle in the driving simulation, specifically speed and steering direction, are synchronized with the real test vehicle on the multi-function roll test stand x-road curve. Thanks to this Vehicle-in-the-Loop setup, a driver or automatic vehicle functions can navigate freely through dynamic driving scenarios. The patented steering capability of the x-road curve ensures that any cornering is compensated by the swiveling front double roller sets, so the test vehicle holds its center position on the test stand and in front of a monitor or screen.
Via a Radar Target Simulator system, whose antennas can be dynamically moved by the multi-axial positioning system x-around. The radar target movements are synchronized with the same virtual driving environment simulator that is stimulating the camera sensor and reproducing the test vehicle movements to avoid deviations between camera and radar sensor perception. A brake intervention of a driver or automatic vehicle functions caused by the stimulated radar objects is met with a realistic load simulation by the x-road curve.
The radar target simulator system stimulates objects in the dynamic driving scenarios with a variable distance, speed and size using delay, frequency and amplitude manipulation of the radar signal.
Dürr’s x-proof 360 Vehicle-in-the-Loop setup using over-the-air stimulation covers all relevant safety-critical automatic driving functions such as:
- Advanced Emergency Braking Systems (AEBS)
- Forward Collision Warning Systems (FCWS)
- Automatic Cruise Control (ACC)
- Automated Lane Keeping Systems (ALKS)
- Lane Departure Warning (LDW)
- Active Lane Change Assistance (ALCA)
- Blind Spot Monitoring (BSM)
- Safe Exit Assistance (SEA)
- Intelligent Speed Assistance (ISA)
- Traffic Sign Recognition (TSR)
- Adaptive High-Beam Systems (AHBS)
- Adaptive Forward Lighting (AFL)
- Steering Assistance Systems and Active Steering Systems (also steer-by-wire)
The scenarios for the tests can be freely defined or set up in accordance with test catalogs such as UNECE, NATM, Euro NCAP, etc. which include critical maneuvers like:
The benefits for applications in the fields of R&D, homologation, end-of-line and periodic technical inspection are manifold:
- Using a real vehicle in a laboratory environment
- No fixation and no modification required on the vehicle
- Sensor stimulation over the air with variable targets
- No large, fenced proving grounds necessary
- No dependencies on environmental conditions (e.g., weather, temperature, track, operators)
- Highly reproducible and repeatable test results
- Easy iteration and variation of manifold test scenarios
- Reduced staff requirements and test setup effort
- Safe operation conditions especially in case of critical maneuvers for operators and for the vehicle under test
- Ready for testing of autonomous driving functions up to level 5