Two-channel wheel speed sensor system
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United States of America Patent
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Sep 8, 2020
Grant Date -
Feb 15, 2018
app pub date -
Aug 15, 2017
filing date -
Aug 15, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A wheel speed sensor system for determining the rotational speed of the wheels mounted at the opposite ends of an axle without requiring wheel speed sensor assemblies for each wheel shaft axle. As a result, the speed sensor system of the present disclosure can be housed in small sized or small capacity axle housing such as banjo type housings. In one embodiment, a wheel speed sensor assembly is positioned in the axle housing to determine the speed of one of the wheel axle shafts and a differential speed sensor assembly is positioned in the axle housing to determine the rotational speed of the differential. With these two speed measurements the rotational speed of the other wheel axle shaft can be calculated by a control unit. The wheel and differential speed sensor assemblies can each include a toothed or slotted ring or disk and sensor for sensing the teeth. In each of the wheel and differential speed sensor assemblies, one of the tone ring and sensor can be mounted for rotation with a wheel axle shaft and gear of the differential respectively and the other can be fixedly mounted. The sensors can detect the passage of teeth over time via the relative motion of the teeth and sensor to determine rotational speed.
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