Instant detection / diagnosis of abrupt bias fault in signals of vehicle motion sensors
First Claim
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1. A system for detecting an abrupt bias fault in an on-board motion sensor in an automotive vehicle, the system comprising, in combination with such sensor:
- signal sources that are independent of the sensor, including signal sources providing signals useful in calculating a motion that at least approximately corresponds to motion represented by a signal of the sensor; and
a processora) for processing the signals from the sensor and from the sources that are independent of the sensor to yield a calculation at least approximately corresponding to motion represented by the signal of the sensor;
b) the processor further processing the calculation and the signal from the sensor to calculate deviation of one from the other; and
c) the processor further processing the calculated deviation for distinguishing a frequency component indicative of such an abrupt bias fault from a frequency component that is not indicative of such a fault.
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Abstract
A system and method for enabling an abrupt bias fault in a vehicle motion sensor (24), such as a yaw rate sensor or a lateral acceleration sensor to be both quickly and accurately diagnosed. When a potential fault is first indicated, it is signaled as true only if the vehicle is in a stable state and vehicle vibration is ruled out as a cause of abrupt signal change. Processing of signals is conducted by microprocessor.
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14 Claims
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1. A system for detecting an abrupt bias fault in an on-board motion sensor in an automotive vehicle, the system comprising, in combination with such sensor:
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signal sources that are independent of the sensor, including signal sources providing signals useful in calculating a motion that at least approximately corresponds to motion represented by a signal of the sensor; and a processor a) for processing the signals from the sensor and from the sources that are independent of the sensor to yield a calculation at least approximately corresponding to motion represented by the signal of the sensor; b) the processor further processing the calculation and the signal from the sensor to calculate deviation of one from the other; and c) the processor further processing the calculated deviation for distinguishing a frequency component indicative of such an abrupt bias fault from a frequency component that is not indicative of such a fault. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting an abrupt bias fault in an on-board motion sensor in an automotive vehicle, the method comprising:
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processing signals from signal sources that are independent of the sensor to calculate a motion that at least approximately corresponds to motion represented by a signal of the sensor; calculating deviation between the sensor signal and the calculated motion; and processing the calculated deviation for distinguishing a frequency component indicative of such an abrupt bias fault from a frequency component that is not indicative of such a fault. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification