ACC,Adaptive Cruise Control

Overview

With real-time measurement of parameters from up to three vehicles and at better than 2cm positional accuracy, the VBOX testing system allows manufacturers to easily verify the effectiveness of their Adaptive Cruise Control system.

With real-time measurement of parameters from up to three vehicles and at better than 2cm positional accuracy, the VBOX testing system allows manufacturers to easily verify the effectiveness of their Adaptive Cruise Control system.

At the core of the system is RACELOGIC's flagship data logger, the VBOX 3i RTK (VB3iSLR), connected via radio telemetry to an RTK Base Station or to another VBOX 3i RTK acting as a moving base.



System Features
• Measured Paramaters
• Multiple Target Capability
• Open Road Testing
• Video Integration
• Free Analysis Software
• ACC Warning Signals
• Multiple Contact Points

Measured Parameters
• Speed of target and subject vehicle (0.1km/h RMS)
• Separation time (0.05s)
• Longitudinal separation (0.02m RMS)
• Lateral separation (0.02m RMS)
• Yaw rate for target and subject vehicle
• Angle to target vehicle (0.1º RMS)
• ACC warning signal output

For a list of all standard GPS data channels and accuracies that are also measured please refer to the VBOX 3i RTK product page.

Multiple Target Capability
The 'Multiple targets' feature of the ACC test equipment is capable of calculating parameters from two target vehicles at the same time.

Open Road Testing
By substituting the DGPS Base Station with a specially configured VBOX 3i Dual Antenna with RTK, our MOVING BASE test setup allows users to test and verify active safety systems outside the test track.

• Conduct realistic testing amongst other road users and roadside architecture
• Test over a large area
• Measure with relative positional accuracy between subject and target vehicle under 5 cm
• Maintain RTK lock between VBOX units with up to 600m of vehicle separation in good conditions
Finf out more about VBOX Moving Base.

Video Integration
When used in conjunction with a VBOX video system, the measured parameters can be graphically overlaid in real-time onto the recorded video, providing a clear visual reference to the performance of the test.

Graphical overlay is totally user configurable and can be easily altered to present relevant information according to the tests being conducted.


Free Analysis Software
VBOX Tools Analysis Software is a flexible and powerful package which allows for detailed post processing of the logged files in order to test the accuracy of your ADAS system. A laptop running VBOX Tools can be used to monitor the measured parameters in real-time, either by a serial, USB, or Bluetooth connection. For Video VBOX files, video can be viewed synchronised with the data within the software.


ACC warning signals
If the vehicle carries the ACC operation data on its CAN Bus, this can be simultaneously logged (and displayed in video if a Video VBOX is also being used) alongside that of the GPS data, giving you an exact comparison between relative vehicle position and onboard strategy data.

Multiple Contact Points
To assist in the testing of ADAS applications such as Blind Spot Monitoring and Rear Cross Path Detection, it is now possible to ‘map' the shape of vehicles using a survey pole, antenna, and VBOX Manager. Up to twenty-four points around the vehicle bodies can be surveyed, and the ‘shape' of each car can be stored for later use. As the test is conducted, the distance of the closest contact points between the vehicles is calculated to +/-2cm accuracy, automatically switching to the nearest contact points as they change with the car's relative positions.

This allows for multiple procedures to be completed without having to reconfigure for individual contact points – such as moving from right rear to left rear flank during blind spot testing. This video demonstrates how the system works:

https://www.youtube.com


Test Procedures
VBOX systems are suitable for the following ACC validation test scenarios:
• Steady state distance
• Approaching convoy
• Acceleration / deceleration in convoy
• Overtaking from steady state
• Lane changing obstacle vehicle
• Overtaking after approach
• Stop and go
• Cornering

ISO 15622
The ISO 15622 standard contains the basic control strategy, minimum functionality requirements, basic driver interface elements, minimum requirements for diagnostics and reaction to failure, and performance test procedures for Adaptive Cruise Control (ACC) systems.

The standard defines three test procedures:

Target acquisition range test

VBOX records the ACC's commands via CAN and displays them live during testing. The vehicle separation is measured with a positional accuracy of better than 2cm.

S = Subject Vehicle (Equipped with ACC)
T = Target Vehicle


Target Discrimination Test

The VBOX constantly measures the distance to the target vehicle which verifies that the ACC has locked onto the correct target. Video VBOX can be used to prove that the 2nd forward vehicle has been passed without affecting the separation range between subject and target vehicle.

S = Subject Vehicle (Equipped with ACC)
T = Target Vehicle
V = Forward Vehicle


Curve Capability Test

VBOX ACC test equipment will measure the time gap and separation between both vehicles accurate to 2cm. For high accuracy sampling of the curved lane we have developed the survey trolley, a line mapping rover wheel which comes with a custom rucksack containing radios, antenna and groundplane.

S = Subject Vehicle
T = Target Vehicle

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