Method of detecting a fault in an automotive system
First Claim
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1. A method for detecting a fault in an automotive system having a power supply and including counter means for recording each occurrence of a fault in said system, said method comprising the steps of:
- a. electrically energizing said system;
b. monitoring a power supply value of said vehicle power supply during a predetermined time interval;
c. detecting an inability of said system to be placed into a desired operating state and generating a fault signal in response thereto;
d. recording each occurrence of said fault signal in said counter means only when said power supply value is within predetermined limits;
e. repeating the above steps until the number of occurrences of said fault signals exceeds a predetermined number; and
f. providing a human detectable fault signal indication when the number of fault occurrences exceeds said predetermined number in said predetermined time interval.
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Abstract
A method for detecting a fault in an automotive system is disclosed, the method including the steps of energizing the system, monitoring the power supply value of the vehicle power supply during a predetermined interval; detecting an inability of the system to be placed into a desired operating state and generating a fault signal in response thereto; and recording each occurrence of a fault signal only when the power supply value is within predetermined limits.
51 Citations
7 Claims
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1. A method for detecting a fault in an automotive system having a power supply and including counter means for recording each occurrence of a fault in said system, said method comprising the steps of:
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a. electrically energizing said system; b. monitoring a power supply value of said vehicle power supply during a predetermined time interval; c. detecting an inability of said system to be placed into a desired operating state and generating a fault signal in response thereto; d. recording each occurrence of said fault signal in said counter means only when said power supply value is within predetermined limits; e. repeating the above steps until the number of occurrences of said fault signals exceeds a predetermined number; and f. providing a human detectable fault signal indication when the number of fault occurrences exceeds said predetermined number in said predetermined time interval. - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting a fault in an automotive system having a battery outputting a voltage, said system having at least two operating states and including counter means for recording each occurrence of a fault in said system, said method comprising the steps of:
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a. electrically energizing said system; b. monitoring said battery voltage during a predetermined time interval; c. detecting an inability of said system to be placed into a desired operating state and generating a fault signal in response thereto; d. recording each occurrence of said fault signal in said counter means only when said battery voltage is between 11 and 16 volts; e. resetting said counter means to zero when said battery voltage is not between 11 and 16 volts; f. repeating the above steps until the number of occurrences of said fault signals exceeds a predetermined number; and g. providing a human detectable fault signal indication when the number of fault occurrences exceeds said predetermined number in said predetermined time interval.
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7. A method for detecting a fault in an automotive system having a power supply and including counter means for recording each occurrence of a fault in said system, said method comprising the steps of:
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a. electrically energizing said system; b. monitoring a power supply value of said vehicle power supply during a predetermined time interval; c. detecting an inability of said system to be placed into a desired operating state and generating a fault signal in response thereto; d. recording each occurrence of said fault signal in said counter means only when said power supply value is within predetermined limits; e. ignoring said fault signal if said power supply value is outside of said predetermined limits; f. resetting said counter means to a predetermined value when said power supply value is outside of said predetermined limits; g. repeating the above steps until the number of occurrences of said fault signals exceeds a predetermined number; and h. providing a human detectable fault signal indication when the number of fault occurrences exceeds said predetermined number in said predetermined time interval.
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Specification