A small, low-cost piezoresistive acceleration sensor suitable for automotive applications such as advanced breaking control and suspension control systems has been developed. A piezoresistive semiconductor sensor has such advantages as high output linearity, long-term output repeatability and DC response a piezoelectric sensor doesn't feature. One drawback, however, is that piezoresistive characteristics are quite temperature sensitive: Such that temperature dependence of DC offset and span have to be compensated with a certain electrical circuit. With 1 mV/Vs/G, the low sensitivity of the acceleration sensor (Vs:bridge voltage, G:gravitational acceleration), the temperature shift of DC offset represented in terms of the sensitivity becomes relatively high. For this reason, we have used a new temperature compensation circuit including a voltage supply sensitive to temperature and a compensation resistor, achieving about 3 % offset temperature error per 1.5 G full scale in the operating temperature range from -30 Cel to 85 Cel.
Piezoresistive acceleration sensor for automotive applications
Piezoresistiver Beschleunigungssensor für Anwendungen in Kraftfahrzeugen
SAE Technical Papers ; 1-6
1992
6 Seiten, 9 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
Piezoresistive Acceleration Sensor for Automotive Applications
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