Claims
- 1. A proximity sensing circuit, comprising:
- a plurality of sensors, each of said plurality of sensors being a proximity detector;
- a multiplexer, each of said plurality of sensors being connected in signal communication with said multiplexer;
- a filter connected in signal communication with said multiplexer, said multiplexer being connected between said plurality of sensors and said filter;
- a controller connected in signal communication with said filter;
- means for comparing filtered signals from each of said plurality of sensors to a first predetermined threshold magnitude;
- a resistor connected in signal communication with said multiplexer;
- means for comparing a filtered signal from said resistor to a second predetermined threshold magnitude; and
- means for diagnosing the operation of said circuit as a function of said filtered signal from said resistor.
- 2. A proximity sensing circuit, comprising:
- a) a plurality of sensors;
- b) a multiplexer, each of said plurality of sensors being connected in signal communication with said multiplexer;
- c) a filter connected in signal communication with said multiplexer, said multiplexer being connected between sail plurality of sensors and said filter;
- d) a controller connected in signal communication with said filter;
- e) means for comparing filtered signals from each of said plurality of sensors to a first predetermined threshold magnitude;
- f) a resistor connected in signal communication with said multiplexer;
- g) means for comparing a filtered signal from said resistor to a second predetermined threshold magnitude; and
- h) means for diagnosing the operation of said circuit as a function of said filtered signal from said resistor.
Parent Case Info
This application is a continuation of U.S. patent application Ser. No. 08/703,163 filed Aug. 28, 1996, now U.S. Pat. No. 5,691,639.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4652821 |
Kreft |
Mar 1987 |
|
5099845 |
Besz et al. |
Mar 1992 |
|
5243337 |
Beauducel et al. |
Sep 1993 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
703163 |
Aug 1996 |
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