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AEB Car-to-Car Rear Braking (CCRb)

Technical Articles July 11, 2018

The AEB CCRb test protocol is used to test how AEB/FCW systems on vehicles travelling at Inter-Urban speeds respond when the vehicle in front suddenly brakes. Unlike the CCRs and CCRm protocols, which are conducted at different speeds and with different amounts of lateral overlap, the CCRb test is conducted at a fixed speed of 50 km/h and with both vehicles in line. The only thing that changes is the initial distance (headway) between the vehicle under test (VUT) and the global vehicle target (GVT) and how hard the GVT brakes.

Protocol accuracy requirements 

Our RT and RT-Range S products meet the requirements below and are well known for their consistency and reliability. 

  • GVT and VUT axes to be in ISO 8855:1991 orientationRT-Range and RT GNSS/INS
  • Lateral path error
  • Update rate at least 100 Hz
  • Time is required as a synchronisation DGPS
  • Position to 0.03 m
  • Speed to 0.1 km/h
  • Yaw velocity to 0.1°/s
  • Acceleration to 0.1 m/s²

Vehicle to Euro NCAP target

Getting the measurements you need 

Because of the need to accurately and consistently maintain rates of deceleration and starting distances during AEB CCRb tests, pedal robots are sometimes used to control vehicles towing soft targets, or autonomous robotic platforms are used. The RT series can easily interface with either and are compatible with all leading robotic/autonomous solutions.

An RT and RT-Range S Hunter are installed in the VUT. Depending on the solution used, an RT will be installed in either the vehicle towing the GVT or in the autonomous platform. A local base station or NTRIP server is also used to transmit differential corrections to the RTs so they can achieve 1 cm accuracy. Communication between the RT-Range S Hunter and the GVT is then achieved using either an RT-Range S Target or, in the case of lower-profile autonomous platforms, an RT-XLAN Wi-Fi module.

The braking profile of the GVT is controlled by the on-board robotic system using information supplied by the RT. The same information is simultaneously transmitted back to the VUT’s RT-Range S Hunter, which can then calculate real-time measurements such as range and time to collision (TTC).

Back at the office, the data from both vehicles 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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