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Dewetron: Forward collision warning according to NHTSA

Dewetron's powerful data-acquistion software is used in the testing of forward collision warning systems


The growing number of sensor and actuator clusters in modern vehicles allows complex driver assistance systems where one of them is forward collision warning (FCW). FCW warns the driver of an imminent frontal collision using acoustical, haptic or optical warnings.

Before gaining approval for the US market, vehicle manufacturers must test their system to comply with the FCW confirmation test defined by the National Highway Traffic Safety Administration (NHTSA). This test evaluates the ability of a FCW system to detect and alert drivers of potential hazards in the path of the vehicle. Three driving scenarios are utilized to assess this technology:

In the first test, a subject vehicle (SV) approaches a stopped principle other vehicle (POV) in the same lane of travel.
The second test begins with the SV initially following the POV at the same constant speed. After a short while, the POV stops suddenly.

The third test consists of the SV, travelling at a constant speed, approaching a slower moving POV, which is also being driven at constant speed.

The goal of these tests is to verify that the FCW system warns the driver early enough to avoid a potential crash, i.e. the FCW warning must occur when the time to collision is greater than 2.1 seconds, depending on the maneuver.

While this sounds easy to evaluate, the tests are in fact challenging. For each vehicle data of multiple sensors and sources must be acquired synchronously:

• GPS data for the vehicle positions and trajectories
• CAN bus data for vehicle speed and yaw rate coming from the vehicle
• Analogue data for accelerations and acoustic FCW warnings
• Video data for optical FCW warnings and test documentation
• Digital data

But on top of that and what’s even more challenging, is to have full synchronization between the two vehicles already during the measurement, in order to accurately calculate the relative distance between the vehicles, their trajectory and speed! With the combined active/passive safety (CAPS) measurement system, DEWETRON provides a turn-key solution for this challenging task.

All sensors and sources (GPS, vehicle CAN, analogue, video and digital data) are acquired with one single system: DEWE2-A4.

The powerful data acquisition software automatically takes care of the synchronous acquisition of all sources and shows live data online, during the measurement in freely customizable data visualization instruments (digital meters, analogue meters, bar-graphs, time-based recorders, GPS map etc). The 3D display is capable of showing the relative position between the two vehicles.

The acoustic warning of the FCW system is acquired using an analogue ICP microphone. While the microphone acquires not only the sound of the warning but also environmental noise (such as motor noise, talk etc) an online FFT-calculation can be used to filter and isolate the input signal so only the acoustic warning is detected and can be used as trigger event.
On the other hand, the optical FCW warning and the surrounding conditions are acquired with a synchronized camera.

For an accurate measurement of the vehicle GPS position, accelerations, speeds and rotational rates the CAPS system uses a gyroscopic sensor from GeneSys: the ADMA-G-RTK2. The ADMA combines high-precision acceleration sensors with fiber-optical rotational-rate sensors for all three axes as well as a fast GPS sensor, which is capable of receiving GPS correction data from a local base station in order to reach a position accuracy of 2cm.The synchronization of the measurement systems between the two vehicles is done by GPS-SYNC. This technology uses the pulse per second (PPS) from the GPS signal and a highly precise clock in each data acquisition system.

Since it is necessary to see important values such as the relative distance between the two vehicles or vehicle speed already during the tests, live measurement data is transferred between the two vehicles using a powerful wireless network. The calculations and combinations of the measurement data of the two vehicles are executed directly in the subject vehicle and can be visualized so that the driver or measurement technician can immediately see all important values already during the measurement.

Finally, to speed up the process of testing, automated test procedures can be created using the sequencer function of the software. The sequencer is very flexible and can optimize the test cycles in many ways: monitor characteristic values to immediately indicate whether the test was successful or if it has to be repeated, trigger the start and stop of the measurement or generate final reports after the test cycle has been completed.

Dewetron GmbH
Tel: +43 316 3070 0;


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