US 11,953,089 B1Granted

Shaft rotation speed and direction sensing

AssigneeGM Global Technology Operations LLC

InventorsAngela M Hutcheon, Joel H Gunderson, Roman Shestakov

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Abstract

A transmission system associated with a vehicle includes a shaft to rotate about an axis of rotation. The shaft is coupled to a gear set. The transmission system includes a target wheel to be coupled to the gear set and to rotate with the gear set. The target wheel includes at least one void. The transmission system includes a giant magnetoresistance (GMR) sensor spaced apart from the target wheel by a gap. The giant magnetoresistance (GMR) sensor is configured to observe the at least one void of the target wheel to determine a rotation speed of the shaft based on a giant magnetoresistance (GMR) effect. The transmission system further includes a rotating shell located in the gap between the target wheel and the giant magnetoresistance (GMR) sensor.

Claims14

Dependent claims

A transmission system associated with a vehicle, comprising:

a first planetary gear set;
a second planetary gear set;
a third planetary gear set;
a shaft configured to rotate about an axis of rotation, the shaft coupled to the first planetary gear set;
a target wheel coupled to the gear set and configured to rotate with the gear set, the target wheel including at least one void;
a giant magnetoresistance (GMR) sensor spaced apart from the target wheel by a gap, the giant magnetoresistance (GMR) sensor configured to observe the at least one void of the target wheel to determine a rotation speed of the shaft based on a giant magnetoresistance (GMR) effect;
and
a rotating shell located in the gap between the target wheel and the giant magnetoresistance (GMR) sensor, wherein the shell is coupled directly to a second planet gear of the second planetary gear set and directly to a third planet gear of the third planetary gear set and is configured to rotate independently of the shaft.

5 more elements

Dependencies are inferred from the claim text.