Design Article
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t.alex
Using Hall effect sensor is an interesting concept as it avoid the wear-and-tear ...
agk
The angle position encoders used in the automobile industry got to be highly ...
Position sensing in vehicles: how new magnetic encoder technology helps ensure accurate, fault-free sensor outputs
Marcel Urban, austriamicrosystems AG
8/9/2010 8:55 AM EDT
Angle and motion sensors are widely used in vehicles for applications such as pedal position-sensing, throttle control, and in transmissions and steering wheels. It hardly needs stating that, particularly in steering systems and the throttle, reliable operation is absolutely essential to the safety of the driver, passengers, other road users and pedestrians. Automotive sensors, then, must be extremely robust, and perform reliably for the whole life of the vehicle.
At the same time, the standards for electromagnetic compatibility (EMC) in vehicles are becoming more stringent, and the development of a new generation of low-carbon diesel and gasoline engines requires better sensor performance with higher resolution and low-power operation. For instance, in steering applications automotive designers are looking for components that draw ultra-low stand-by current. There is even a move towards 'measurement on demand' to reduce power consumption in control electronics.
Sensors also need to adapt to new digital interfaces such as SENT and PSI5, which will replace traditional analog outputs.
All of these factors in combination are accelerating the elimination of traditional contacting sensor solutions, and their replacement by contactless sensors.
austriamicrosystems has pioneered the development of integrated Hall encoder solutions, with its AS5xxx series optimised for automotive applications. This article describes how robust performance in challenging automotive conditions is facilitated by the use of a patented differential sensor technology.
To access the full article, click here.
Figure 1 shows a magnetic sensor, AS5163, with a simple diametrical (two-pole) magnetised magnet. The sensor IC measures the vertical field components, Bz, and calculates an absolute angle value.
About the author:
Marcel Urban joined austriamicrosystems in 2000 as a design engineer working encoder products. Since 2008, he has been a product manager responsible for automotive magnetic encoders.
Courtesy of Automotive DesignLine Europe.
At the same time, the standards for electromagnetic compatibility (EMC) in vehicles are becoming more stringent, and the development of a new generation of low-carbon diesel and gasoline engines requires better sensor performance with higher resolution and low-power operation. For instance, in steering applications automotive designers are looking for components that draw ultra-low stand-by current. There is even a move towards 'measurement on demand' to reduce power consumption in control electronics.
Sensors also need to adapt to new digital interfaces such as SENT and PSI5, which will replace traditional analog outputs.
All of these factors in combination are accelerating the elimination of traditional contacting sensor solutions, and their replacement by contactless sensors.
austriamicrosystems has pioneered the development of integrated Hall encoder solutions, with its AS5xxx series optimised for automotive applications. This article describes how robust performance in challenging automotive conditions is facilitated by the use of a patented differential sensor technology.
To access the full article, click here.
Figure 1: Contactless magnetic encoder
Figure 1 shows a magnetic sensor, AS5163, with a simple diametrical (two-pole) magnetised magnet. The sensor IC measures the vertical field components, Bz, and calculates an absolute angle value.
About the author:
Marcel Urban joined austriamicrosystems in 2000 as a design engineer working encoder products. Since 2008, he has been a product manager responsible for automotive magnetic encoders.
Courtesy of Automotive DesignLine Europe.
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agk
8/13/2010 5:11 AM EDT
The angle position encoders used in the automobile industry got to be highly reliable and accurate. The AS5163 from austrianmicro system is innovative.The differential technology by Marcel Urban is novel and unique. The four hall elements works differentially and the Maths behind this is cleverly explained by the author and the designer.On top of this it is tested for the Homogeneous Static and stray magnetic fields and proves to be robust. Using the differential technology temperature compensation is dispensed with and an added advantage, this increases the reliability. The electrical disturbances are high in the automobile applications and this is taken care in this design. Over all a new reliable accurate burden free sensor for the auto system designers
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t.alex
8/16/2010 9:17 PM EDT
Using Hall effect sensor is an interesting concept as it avoid the wear-and-tear issue of mechanical ones. Nevetheless is there any problem or limitations for this sensor to work with higher speed?
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