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01/01/2008
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Speed sensors have a vital role in protecting turbochargers from overspeeding.
Non-contact eddy current sensors are well-known in the commercial vehicle sector but now BorgWarner Turbo & Emission Systems has developed a unit suited to passenger cars that attaches directly to the compressor housing. The developers say they have also improved the unit’s electromagnetic compatibility.
The new sensor is a ‘non-pigtail’ solution with integrated electronics. The previous version used a passive speed sensor and was based on the inductive principle without a supply voltage. By contrast, the new sensor is a 5V active design that transmits a rotational speed signal to the engine management unit.
Many parts of the discrete electronics, such as circuitry components, have been installed in an ASIC (using advanced high-temperature silicon on insulator technology) and therefore require less space.
The tip of the sensor, which lies flush with the contour of the compressor channel, is designed to withstand 250ºC. Capable of measuring speeds from 1,000 to 35,000rev/min, the unit has been designed for a service life of 1.6 million kilometres.
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Author
Roger Bishop
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Copyright European Automotive Design.
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