Application-based Development of Acoustic Sensors in Vehicles
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Application-based Development of Acoustic Sensors in Vehicles The Institute for Automotive Engineering at RWTH Aachen University, in cooperation with fka, has established an innovative technology for the recording and processing of acoustic information in vehicles, the technical challenges and development methods of which are explained here. Potential for this technology is expected in the detection of safety-relevant environment sounds, in system monitoring and in the realization of comfort functions. The understanding of this diversity and the expectation of legal requirements for automated vehicles also allow an economic evaluation.
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APPROACH
For application-based development, use cases are identified and the feasibility of implementation is evaluated from a technical point of view. Based on this, the requirements to be achieved are identified. The integration into the vehicle system must be taken into account as well. In addition, the use of acoustic data leads to new challenges in the areas of signal recording, data transfer and data processing. In order to evaluate the functionality and the innovation potential of a use case early in the development process, the applied methodology enables a fast implementation of feasibility studies, FIGURE 1. Depending on the requirements, some technical details are developed from basic research to implementation, while for others fast and accessible solutions are used. Patent research supports a quick limita-
AUTHORS
Armin Errajiis is Scientific Employee in the Research Area Vehicle Dynamics & Acoustics at the Institute for Automotive Engineering at RWTH Aachen University (Germany).
The performance of the system is defined by the quality of the signal recording. The choice whether to use an airborne or structure-borne based
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SIGNAL RECORDING
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Based on the variety of different use cases, a wide range of requirements for the function and the system, including sensor and ECU, have to be considered in the development. Further requirements result from the flexibility for quick evaluation of functions and the possibility of migration to a seriescompatible solution. The architecture as well as the strategy for integration into the vehicle system affect the hardware, software and function development concept in an equal measure. FIGURE 2 shows the simplified archi tecture of an ECU for acoustic sensors in vehicles. A hierarchical architecture allows mixed-criticality applications and enables both functional testing and qualification without having to change the platform. Safety-critical applications can also be implemented according to ISO26262 or IEC61508 [1, 2]. The combination of a high safety controller (CS) and a high resource and powerful Compute Module (CM) provides significant advantages in the development process. In the early development phase, functions can first be developed in the CM’s ecosystem with lo
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