Robust fault detection method
AssigneeDelphi Technologies, Inc.
InventorsAshok Chandy, Mark Philip Colosky, Mark Dennis Kushion
Life of this patent
Estimating the term…
Abstract
A system and method of discriminating faults in an error signal, such as that from a control input sensor, comprises a system for and method of determining allowable limits of an error signal versus time, passing the error signal through a low-pass filter, comparing output of the low-pass filter with a threshold and outputting a fault condition when the output of the low-pass filter exceeds the threshold. The time constant or constants of the low-pass filter and the threshold are selected so that a fault condition is detected when the error signal approaches the allowable limits before exceeding them.
Claims22
A method for detecting a fault condition in a control system, said method comprising:
- determining allowable limits of an error signal in said control system versus time;
- passing the error signal through a low-pass filter;
- comparing an absolute value of the output of the low-pass filter with a threshold;
- outputting a fault condition when the output of the low-pass filter exceeds the threshold;
- and
- selecting a time constant of the low-pass filter and the threshold so that a fault condition is detected when the error signal approaches the allowable limits of the error signal before exceeding them.
A system for detecting a fault condition in an error signal comprising:
- a controller passing said error signal through a low-pass filter, comparing output of the low-pass filter with a threshold, and outputting a fault condition signal when the output of the low-pass filter exceeds a threshold, wherein
- a time constant of the low-pass filter and the threshold are such that the fault condition is detected when the error signal approaches allowable limits before exceeding them.
Dependencies are inferred from the claim text.