Stability characteristics of the double pole wheel for accurate magnetic speed sensing

Magnetic sensor systems are widely used for contact-free speed detection in the automotive industry. State-of-the-art speed measurements are typically performed using magnetic pole wheels that require extensive signal post processing to compensate for imperfections like noise, manufacturing intolerances, vibration and stagger. Some applications such as tire pressure monitoring, tire-road friction measurements and Anti-locking Brake Systems (ABS) demand a high degree of accuracy in the signal. An alternative pole wheel structure is proposed in this paper, which improves the characteristics of the signal measurements significantly.

[1]  C.P.O Treutler,et al.  Magnetic sensors for automotive applications , 2001 .

[2]  Fredrik Gustafsson,et al.  Rotational speed sensors: limitations, pre-processing and automotive applications , 2010, IEEE Instrumentation & Measurement Magazine.

[3]  M. Jungwirth,et al.  Magnetic Field Sensor Using a Physical Model to Pre-Calculate the Magnetic Field and to Remove Systematic Error due to Physical Parameters , 2007, 2007 International Conference on Thermal, Mechanical and Multi-Physics Simulation Experiments in Microelectronics and Micro-Systems. EuroSime 2007.

[4]  Michael Ortner,et al.  Signal Analysis in Back Bias Speed Sensor Systems , 2013, 2013 European Modelling Symposium.

[5]  L. Guvenc,et al.  Tire Pressure Monitoring [Applications of Control] , 2007, IEEE Control Systems.