Apparatus for detecting the failure of a sensor
First Claim
Patent Images
1. An apparatus for detecting the degradation of a sensor comprising:
- a memory;
sampling means for obtaining a first, second and third value from said sensor at regular intervals and storing them in said memory;
differential means for calculating a first difference between said second value and said first value to obtain a first slope and a second difference between said third value and said second value to obtain a second slope;
comparison means for comparing said first difference and said second difference each with a positive and negative predetermined value to detect a noise spike, said predetermined value corresponding to a slope of a noise spike;
counter means for incrementing a count in response to each detected noise spike during a predetermined number of comparisons; and
indicator means for indicating sensor degradation if the count exceeds a predetermined value.
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus to detect the failure of sensor is comprised of a microprocessor which reads sensor values. If the sensor values exceed the inherent noise level and exceed the maximum mechanical change in the system that portion of the signal is counted as noise. If the noise count exceeds a predetermined count, indicator signals the sensor is bad.
132 Citations
3 Claims
-
1. An apparatus for detecting the degradation of a sensor comprising:
-
a memory; sampling means for obtaining a first, second and third value from said sensor at regular intervals and storing them in said memory; differential means for calculating a first difference between said second value and said first value to obtain a first slope and a second difference between said third value and said second value to obtain a second slope; comparison means for comparing said first difference and said second difference each with a positive and negative predetermined value to detect a noise spike, said predetermined value corresponding to a slope of a noise spike; counter means for incrementing a count in response to each detected noise spike during a predetermined number of comparisons; and indicator means for indicating sensor degradation if the count exceeds a predetermined value. - View Dependent Claims (2, 3)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeFord Global Technologies, LLC (Ford Motor Company)
-
Original AssigneeFord Motor Company
-
InventorsKepner, Charles M.
-
Primary Examiner(s)Ramirez, Ellis B.
-
Assistant Examiner(s)KEMPER, MELANIE A
-
Application NumberUS08/037,157Time in Patent Office705 DaysField of Search364/550, 364/551.01, 364/481, 364/483, 324/537, 324/538, 324/549, 340/650, 340/652, 340/653, 340/654, 340/661, 341/118US Class Current702/183CPC Class CodesB60W 2050/021 Means for detecting failure...G01D 3/08 with provision for safeguar...
