Transmission input shaft speed measuring assembly
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United States of America Patent
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-
Aug 25, 2009
Grant Date -
Mar 27, 2008
app pub date -
Sep 21, 2007
filing date -
Jul 25, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A device for sensing the input shaft speed of an automotive automatic transmission that is driven by the engine through the fluid coupling of a torque converter. The speed sensor device includes circumferentially spaced markings about the transmission input shaft and a speed sensor that is placed at close proximity to the circumferentially spaced markings through a hole in the torque converter stator shaft. An electronic control unit (ECU) analyzes the sensor output signal and in the case of an active speed sensor it also functions as its power source. During vehicle operation, the transmission input shaft rotates the target wheel in front of the speed sensor causing modulation of its output signal. The electronic control unit analyzes the signal modulation and calculates the input shaft rotational speed. A variety of sensor/target-wheel options and sensor mounting techniques could be used depending on the application constraints.
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