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

1.

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

2.

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

3.

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