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Radar-Based, Pre-crash Sensing in a Framework of a Sensor Concept for Functional Integration
Published December 04, 2000 by Fraunhofer Institut Chemische Technologie in Germany
Event: Airbag 2000
Pre-crash functionality introduces surround sensing technology into the area of passive safety. Although a pre-crash, stand-alone, single-sensor configuration is expected as a first step, the success of pre-crash functionality based on the innovative surround-sensing technology depends on the sensor system's capability to serve several functions at a time integrating their information requirements into a sensor platform. The sensor platform architecture with its logical interfaces is developed using the CARTRONCS® design rules installing hierarchical functional levels important to the correct integration of the envisioned functionality including pre-crash sensing.
Pre-crash functionality itself is defined by the three functional steps: PRESET, PREFIRE and PREACT. The functional steps are described in the order of growing requirements for situation analysis performance and of an increasing amount of necessary system application effort. Each functional step defines its own range of view, the so-called virtual barrier. This definition is subject to various constraints in respect to sensor configuration and pre-crash performance. The main focus of the article is the PRESET functionality for frontal pre-crash in a single-sensor configuration for which a test example is given, too.