Download PDF by Jürgen Valldorf, Wolfgang Gessner: Advanced microsystems for automotive applications

By Jürgen Valldorf, Wolfgang Gessner

ISBN-10: 3540244107

ISBN-13: 9783540244103

Since 1995 the once a year foreign discussion board on complex Microsystems for car purposes (AMAA) has been held in Berlin. the development deals a special chance for microsystems part builders, procedure providers and automobile brands to teach and to debate competing technological methods of microsystems dependent strategies in vehicles.

The publication accompanying the development has tested to be an effective software for the diffusion of latest techniques and know-how effects. the current quantity together with the papers of the AMAA 2005 supplies an summary at the cutting-edge and descriptions drawing close and mid-term R&D views. The 2005 book displays – as long ago – the present nation of discussions inside of undefined. greater than the former guides, the AMAA 2005 "goes again" to the technological requisites and imperative advancements for enjoyable the marketplace wishes. the big a part of contributions facing sensors in addition to "sensor applied sciences and information fusion" is exemplary for this tendency.

In this context a paradigm shift will be said. some time past the advance targeted predominantly at the detection and processing of unmarried parameters originating from unmarried sensors. this day, the problem more and more is composed in getting details of advanced occasions with a sequence of variables from various sensors and in comparing this data. shrewdpermanent built-in units utilizing the knowledge deriving from some of the sensor assets might be in a position to describe and verify a site visitors state of affairs or behaviour a lot speedier and extra trustworthy than a individual could possibly do.

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2. Accelerometers manufacturers’ 2003 market share (all applications) The market shares in 2003 for airbag sensors were the following: ADI with 27%, Freescale with 15%, Bosch with 35%, Delphi with 9% and Denso with 8%. Today, the trends are to have more sensors in order to have focused activation of airbags and the integration of several axis of detection in one pack- Status of the inertial MEMS-based sensors in the Automotive aged sensor. For active suspension, a ±3g acceleration sensor is necessary with high accuracy.

But, some players (such as Bosch, AD …) are using Deep RIE equipments in surface micromachining process in order to benefit from the high etching rate. Using these data, we calculated that, in 2004, more than 30 Deep RIE equipments should have produced about 100 millions accelerometers (that is 75% of the total production). By keeping a conservative scenario (in 2007, the use of Deep RIE will remain at 80% of the total production), we estimate that almost 50 Deep RIE equipments will be necessary in 2007.

New emissions regulations for trucks and cars taking effect in 2007/2008 will require a further reduction of the NOx gas concentration. Ammonia (NH3) is injected into the exhaust gas to reduce the NOx concentration. Thus, both a NOx and a NH3 sensor are required. Very little proven technology for reliable detection under automotive specifications exists today. The most mature technology available use metal oxide gas sensitive layers and electrochemical sensor principles, none of which currently offer sufficient long term stability and selectivity.

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Advanced microsystems for automotive applications by Jürgen Valldorf, Wolfgang Gessner

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