Pre-crash systems have to be actuated within milliseconds and are often based on irreversible actuators. Therefore they have high requirements concerning real-time sensor data and the integrity of their object lists. In the first part of this paper an overview of current sensor technology used today for driver assistance and safety applications is given. Every sensor technology has its characteristic advantages and shortcomings in terms of detection range and reliability. To achieve the extremely low false alarm rate demanded by irreversible pre-crash systems a high-level fusion strategy has a high potential and is currently under development. Another task that is inseparably connected to the development of pre-crash systems is their testing and verification of detection rate and false alarms. Particularly the latter aspect is of major importance regarding customer satisfaction and product riability. Unfortunately it is not known a priori, in which situations a false positive alarm may occur. So, testing this aspect has to be done by recording and analysis of false positives during extensive road-tests. Since it is obviously not feasible to accomplish billions of kilometres the extremely low failure rate has to be proven by a combination of road-tests and extrapolation by statistical means. This is only possible if the chosen scenarios (area, road types, weather conditions, etc.) are sufficiently representative to allow statistically firm statements. The second part of the paper describes a general process to achieve a representative test drive and gives an example of a parameter analysis that is used to estimate false alarm rates. Since these systems partially take corrective action or initiate a breaking manoeuvre the question of the functionality of each single system and even more the interaction or interference of different assistance systems (who is braking first?) becomes continuously more important. Today the proof that a pre-crash system is not activated until it is expected to deploy in a real crash demands nearly the same effort as the development of its intended functionality. Therefore cost- and time-effective testing and verification is a topic of major concern in the development of today's and future pre-crash systems.
Testing of pre-crash systems with extremely low false alarm rate
2008
13 Seiten, 9 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Konferenz)
Englisch
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