System and method for particulate sensor diagnostic

Details System and method for particulate sensor diagnostic System and method for particulate sensor diagnostic

2007-10-04

2009-10-27

Rogers, David A. (Department: 2856)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S500000, C324S522000, C324S523000, C324S527000, C324S537000

Reexamination Certificate

active

07609068

ABSTRACT:
A particulate (soot) sensor system has a diagnostic feature for verifying the integrity of the wiring leads. The sensor system includes a sensor and processing circuitry. The sensor has a substrate, first and second sensing electrodes on the substrate and a heater electrode. The heater electrode is electrically isolated from the first and second sensing electrodes, although there is a parasitic capacitance between them. The processing circuitry includes a heater driver, a measurement circuit connected to the sensing electrodes by wire leads, and a detector. The heater driver, in addition to energizing the heater, produces a stimulus signal that is applied to the heating electrode, which is then coupled via the parasitic capacitance to the sensing electrodes. The detector is coupled to the wiring leads and is configured to detect the stimulus signal when there is electrical conductivity over the leads to the sensing electrodes.

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