Method for determining the rotational velocity of an axle and detecting a locked axle condition
First Claim
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1. A method for detecting a rotational velocity of a traction motor in a vehicle comprising:
- obtaining a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
processing said traction motor signal to create an indication result based on a frequency of said traction motor signal; and
determining rotational velocity of said traction motor based on said indication result.
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Abstract
A method for detecting a rotational velocity of a traction motor in a vehicle comprising: obtaining a traction motor signal having at least one phase, wherein the traction motor signal is responsive to an operating condition of the traction motor in an electrically unexcited state. The method also includes processing the traction motor signal to create an indication result based on a frequency of the traction motor signal and determining rotational velocity of the traction motor based on the indication result.
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Citations
32 Claims
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1. A method for detecting a rotational velocity of a traction motor in a vehicle comprising:
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obtaining a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
processing said traction motor signal to create an indication result based on a frequency of said traction motor signal; and
determining rotational velocity of said traction motor based on said indication result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A data storage medium including instructions encoded in a computer readable form for causing a computer to implement a process for detecting a rotational velocity of a traction motor in a vehicle comprising:
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obtaining a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
processing said traction motor signal to create an indication result responsive to a frequency of said traction motor signal; and
determining rotational velocity of said traction motor based on said indication result.
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30. A computer data signal encoded in a computer readable medium, said data signal comprising code configured to direct a computer to implement a process for detecting a rotational velocity of a traction motor in a vehicle comprising:
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obtaining a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
processing said traction motor signal to create an indication result responsive to a frequency of said traction motor signal; and
determining rotational velocity of said traction motor based on said indication result.
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31. A computer processor on a vehicle for performing a process for detecting a rotational velocity of a traction motor in a vehicle comprising:
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obtaining a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
processing said traction motor signal to create an indication result responsive to a frequency of said traction motor signal; and
determining rotational velocity of said traction motor based on said indication result.
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32. A system for detecting a rotational velocity of a traction motor in a vehicle comprising:
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a traction motor generating a traction motor signal having at least one phase, wherein said traction motor signal is responsive to an operating condition of said traction motor in an electrically unexcited state;
a voltage sensor configured to generate a signal indicative a voltage generated by residual flux in said traction motor when rotated by movement of said vehicle with said traction motor in an electrically unexcited state; and
a controller in operable communication with at least one of said traction motor and said voltage sensor configured to process said traction motor signal and said signal, and thereby create an indication result responsive to a frequency of said traction motor signal and indicative of rotational velocity of said traction motor.
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Specification