Sensor diagnostic system

• US 5,553,489 A
• Filed: 02/01/1995
• Issued: 09/10/1996
• Est. Priority Date: 02/01/1995
• Status: Expired due to Term

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hollenbeck, Neal W., Connell, Lawrence E.
• Primary Examiner(s): RAEVIS, ROBERT R
• Application Number:
  US08/384,502
• Time in Patent Office: 587 Days
• Field of Search: 73/1 R, 73/2, 73/3, 73/4, 73/1 G, 73/118.1, 73/117.2, 73/117.3, 73/119 A
• US Class Current: 73/114.58
• CPC Class Codes: G01D 18/00 Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00

Abstract

A diagnostic system for measuring behavior of signals provided by a plurality of sensors (101, 129) includes a plurality of input filters (107, 135) for receiving signals (105, 133) from each of the plurality of sensors (103, 131) and for providing a plurality of filtered sensor signals (109, 137) each derived from the received signals (105, 133). A signal bandwidth of each of the plurality of filtered sensor signals (109, 137) is lower than a signal bandwidth of the than a signal bandwidth of the associated received signal. A selection circuit (119) receives each of the signals (105, 133) from each of the plurality of sensors (103, 131) and, dependent on a selection signal (127), provides a selected sensor signal (121) derived from one of the received signals (105), wherein the selected sensor signal (121) has a signal bandwidth greater than one of the filtered sensor signals (109) derived from the one of the received signals (105).

Claims

1. A diagnostic system for measuring behaviour of signals provided by a plurality of sensors comprising:

a plurality of filter circuits for receiving signals from each of the plurality of sensors and for providing a plurality of filtered sensor signals each derived from the received signals, wherein each of the plurality of filtered sensor signals have a signal bandwidth lower than a signal bandwidth of the associated received signal;

a selection circuit for receiving the signals from each of the plurality of sensors and, dependent on a selection signal, for providing a selected sensor signal derived from one of the received signals, wherein the selected sensor signal has a signal bandwidth greater than a signal bandwidth of one of the plurality of filtered sensor signals; and

a converter circuit for receiving each of the plurality of filtered sensors signals and the selected sensor signal and for providing a converted signal dependent on another selection signal.

2. A diagnostic system for measuring behaviour of signals provided by a plurality of sensors comprising:

a plurality of filter circuits for receiving signals from each of the plurality of sensors and for providing a plurality of filtered sensor signals each derived from the received signals, wherein each of the plurality of filtered sensor signals have a signal bandwidth lower than a signal bandwidth of the associated received signal; and

a selection circuit for receiving the signals from each of the plurality of sensors and, dependent on a selection signal, for providing a selected sensor signal derived from one of the received signals, wherein the selected sensor signal has a signal bandwidth greater than a signal bandwidth of one of the filtered sensor signals derived from the one of the received signals,

a diagnostic filter circuit, and wherein the provided selected sensor signal is filtered by the diagnostic filter circuit.

3. A diagnostic system for measuring behaviour of signals provided by a plurality of sensors comprising:

a first input terminal for receiving a first sensor signal;

a first filter operatively coupled to the first input terminal for receiving the first sensor signal and for providing a filtered first sensor signal dependent thereon;

a second input terminal for receiving a second sensor signal;

a second filter operatively coupled to the second input terminal for receiving the second sensor signal and for providing a filtered second sensor signal dependent thereon;

a selectable diagnostic filter, operatively coupled to the first and second input terminals, for receiving the first and second sensor signals and, dependent on a selection signal, for providing a selected sensor signal having a signal bandwidth greater than a signal bandwidth of the filtered first sensor signal and the filtered second sensor signal.

4. A diagnostic system for measuring behaviour of signals provided by a plurality of sensors comprising:

a first selection device for receiving signals from each of the plurality of sensors and for providing a first signal with a reduced signal bandwidth derived from one of the plurality of signals and dependent on a selection signal;

a second selection device for receiving the signals from each of the plurality of sensors and for providing a second signal corresponding to one of the plurality of signals dependent on a second selection signal, wherein the second signal has a signal bandwidth greater than the reduced signal bandwidth associated with the first signal.