Accelerometers and Gyroscopes are becoming more relevant in modern cars due to increasing ESC take rates, with a trend of becoming series equipment. Additional premium features and options are requiring higher performance from the very same sensors. This article should show opportunities to close the gap in between technical trends for inertial sensors and dedicated requirements for different automotive applications, leading to cascade building block structures for the applications. Beside the description of technological inertial sensor trends, the question of useful sensor fusion should be answered. VTI Technologies has a leading position in development and production of intertial sensors for ESC and drive dynamic as well as associated automotive safety applications. AFS and Airbag require dedicated and direct redundancies which are realized by separate signal path. For other systems a direct signal redundancy can be replaced by modelling of different input parameters. A fusion of sensors is always possible as long as the following aspects are covered: - Safety features will still achieve their functional safety level. The ISO26262 will help to in formal decision-making. - The sensors used for sensor fusion are still supporting the signal requirements for each individual application. - The bundling makes sense for the entire platform in order realize all possible take-rate options. Depending on the platform strategy, the OEM may cascade the system in a way that basic functions like Airbag and ESC are set for all cars. Here ESC and Airbag acceleration sensors are having a different operational range, but the low-g from ESC may help as redundancy for the airbag fire decision. Options which are having a much lower take rate may be bundled in a secondary ECU in a way that the basic function is not getting additional cost burden from those options. Premium features may need dedicated sensors which are populated only in case of their need to the advanced functionality ECU only. For the product planning on component supplier side it is important to understand that not all functions will be relevant for all cars in a way that Inertial Measurement Units (IMU) with six degrees of freedom (6 DOF) with their three gyroscope and three acceleration signals might be nice to have, but for the standard car using just one gyro and one accelerometer signal, they may suffer due to their cost burden. The optional sensing axis for premium functions may have a take rate of 10% to 20% only. Therefore, cascading will be important to get the best compromise for the entire platform.


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    Title :

    Scaling Inertial Sensors for Comfort and Safety Systems


    Contributors:
    Pekkola, Jan (author) / Thurau, Jens (author)


    Publication date :

    2011


    Size :

    7 Seiten, 12 Bilder, 9 Quellen




    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English