bullet Yaw Sensors



Yaw Sensors News                                                                                                                 Last Up-date: 04/01/20 17:12:18


New Bosch Sensor Measures Yaw Rate and Acceleration Simultaneously. The Bosch SMI540 is the first micromechanical inertial measurement unit for vehicle dynamics control in a low-cost SOIC16w housing. The unit opens up new development possibilities for the Electronic Stability Programme ESP. The 3-D sensor simultaneously monitors three of a vehicle's movement axes - two acceleration or inclination axes (ax, ay), and one axis of rotation (?z). According to the manufacture, until now, at least two separate sensors were required for this. The SMI540 has a digital serial peripheral interface with two standard protocols. Thanks to a constant internal self-test of the yaw-rate sensor element, this interface meets the highest operating safety standards ...



Definition and Principle

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The rotation of the vehicle's body around its center point as viewed from above. When a vehicle enters a turn or makes a sudden lane change, it experiences a change in yaw. A yaw sensor in the ABS stability control system senses this change to determine if the vehicle is experiencing understeer or oversteer. If the yaw rate indicates a problem, corrective actions are taken to help keep the vehicle under control.


The principle for registering rate of yaw is based on the fact that forces (known as Coriolis forces) act on mass moving forwards in a rotating system (this movement is termed "translation"). If there are oscillating mass elements in this system, this oscillatory action is affected when the system starts to rotate.


Articles, Papers and References

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Navid Yazdi, Farrokh Ayaz and Khalil Najafi, Micromachined Inertial Sensors, Proceedings of the IEEE, Vol. 86, No. 8, August 1998, pp.1640-1659.

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F. Ayazi, The HARPSS Process for Fabrication of Precision MEMS Inertial Sensors, Mechatronics 12 (2002), November 2002, pp.1185-1199, Elsevier Science Ltd.


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Th. Ringler, J. Steiner, R. Belschner and B. Hedenetz, Increasing System Safety for by-wire Applications in Vehicles by using a Time Triggered Architecture, Vol. 108, Issues 1-3, Pages 1-285 (15 November 2003), Selected Papers from the Pacific Rim Workshop on Transducers and Micro/Nano Technologies, China, 22-24 July 2002






Handbook of Laboratory Measurements



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