Sport-utility vehicles (SUV's) have high centres of gravity which makes them prone to tipping over as result of a sliding action or a collision. This risk may be lowered by the use of electronic stability programs (ESP) to interact with the braking of individual wheels to helping prevent spinning or plowing out. SensoNor together with Imego developed and tested gyro concepts with bias-stability in the range of a few deg/h using SensoNor's existing roll-over vibratory gyro die. This has been possible by improving the LNAs and implementing a model-based concept where the feedback loops are implemented in the digital domain. The digital part includes 5th order sigma-delta AD converters and 5th order feedback filters to accommodate for an optimized trade-off between complexity and signal-noise ratio. The novel digital algorithm based approach described in the paper is a significant leap enabling flexible high performance solutions to be built upon fairly conventional MEMS structures. The measurements clearly show that the gyro sensing die in the SAR10 roll-over gyro is close to matching the performance of expensive gyros used in inertial navigation systems and is by far capable of meeting bias-stability requirements for short and long term needs in automotive vehicle stability and safety systems. The developed ASIC meets all performance needs, however, the demonstration ASIC has some flexibility and test features that will be reduced for a commercial product.
Model-based digital implementation of automotive grade gyro for high stability
Modellbasierte digitale Implementierung eines Fahrzeuggyroskops für hohe Stabilität
2005
15 Seiten, 17 Bilder, 2 Quellen
Conference paper
English
Model-Based Digital Implementation of Automotive Grade Gyro for High Stability
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