AEB Vulnerable Road User (VRU)

Technical Articles July 11, 2018

In city environments, collisions between vehicles and pedestrians or cyclists often result in serious injuries because there is little time for either party to react. The AEB Pedestrian and AEB Bicyclist tests are designed to test how effective systems are when a vulnerable road user (VRU) crosses the car’s path. 

A number of test scenarios are conducted under this protocol using adult, child and cyclist dummies. These scenarios include different approach directions and speeds for the VRU targets, the use of obstructions to hide targets from the vehicle under test (VUT) and day and night tests with different lighting conditions. 

Unlike other AEB tests, where the range between VUT and target is calculated using two points, the AEB VRU tests use polygons to define the shape of the Euro NCAP pedestrian target (EPT) or Euro NCAP bicycle target (EBT), while the front of the VUT is defined using a profiled line. The distance between the VUT and target is then calculated from the nearest point. 

RT next to RT-Range

Protocol accuracy requirements 

Our RT and RT-Range Hunter products easily meet or exceed the requirements below and are well known for their consistency and reliability. 

  • EBT/EPT and VUT axes to be in ISO 8855:1991 orientation 
  • Lateral path error 
  • Update rate at least 100 Hz 
  • Time is required as a synchronisation DGPS 
  • Position to 0.03 m 
  • VUT Speed to 0.1 km/h 
  • EBT/EPT Speed to 0.01 km/h 
  • Yaw velocity to 0.1°/s 
  • Acceleration to 0.1 m/s² 
  • Polygon perimeter shapes 

AEB VRU testing with OxTS RT-Range

Getting the measurements you need 

Many tests in the VRU protocol are very precise, specifying where a target would impact the test vehicle if no intervention took place. Because of the complex timing and acceleration required to ensure this, robotic platforms or pulley systems are used to operate the VRU targets. It’s also important for the VUT to drive in a consistent way, because any deviation from the driven line affects the point of impact. 

Because of the number of solutions available (robotic platform, beam-triggered systems), there is no typical scenario. However, what matters in all cases is that the target is triggered at the appropriate time and that the precise position, orientation and velocity of both the VUT and target are known. Using RTs and the RT-Range products, it’s possible to pass the information to any robotic control systems while simultaneously capturing the information and calculating real-time range measurements based on perimeter shapes. 

The ability of the RTs and RT-Range Hunter to work in complex scenarios is one of the reasons they’ve remained at the cutting edge of ADAS development. Back at base, the data from all sources can be downloaded, processed, tested and exported in CSV format for further analysis, using software tools that are included free of charge. 

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