By Jnrgen Valldorf, Jürgen Valldorf, Wolfgang Gessner
Microsystems functions (MST) in vehicles became ordinary: they allow the creation of a chain of recent features and whilst the alternative of latest applied sciences delivering better functionality and higher price for cash. Microsystems are critical for gratifying an entire transition from the routinely pushed car approach to a routinely dependent yet ICT-driven method as a part of a likewise complicated setting. With the creation of micro-systems a chain of demanding situations come up concerning complexity, structures layout, reliability, serviceability, and so on. those demanding situations need to be addressed so that it will meet excessive shopper expectancies bearing on functionality and value.
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Extra info for Advanced microsystems for automotive applications 2004: [8th AMAA international conference, taking place in March 2004 in Berlin]
2 Calibration Calibration is done by measuring the sensor at multiple temperatures and pressures. Uncorrected data from the A/D converter is read out thru a digital I/O for each data point. The external calibration computer then determines the minimum error and loads the order of the correction in pressure and temperature and correction coefficients into EEPROM. Verification of the calibration can then be performed to verify calibration accuracy as desired. Fig. 3. Linearity correction capability of co-integrated sensor system.
The EEPROM floating gate is then deposited using a doped LPCVD polysilicon film. The floating gate polysilicon is patterned and etched so that it also forms the bottom fixed plate of the capacitive pressure sensor. The isolation of the fixed electrode to the substrate is provided by the CMOS field oxide isolation. The CMOS transistor gate oxide is then deposited followed by the gate polysilicon deposition. Fig. 5. CMOS Integrated pressure sensor. At this stage, the CMOS fabrication is suspended and the sensor fabrication steps are inserted.
Due to this high amount of KSI accidents occur in combination with rollover (especially with SUVs) there are discussions about rollover safety systems for new vehicles. Especially for SUVs there is a lot of discussion going on. To be able to compare useful rollover safety strategies it is important to define rollover resistance measuring methods. Therefore the NHFSA has done a socalled “New Car Assessment Program”. The goal of this program was to find rules for the customer to assess the resistance of a car against rollover.