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An apparatus comprising an internal combustion engine, an exhaust system in communication with the engine, a particulate sensor associated with the exhaust system, and a controller in electrical communication with the particulate sensor, wherein the controller is configured to determine a change in

An apparatus comprising an internal combustion engine, an exhaust system in communication with the engine, a particulate sensor associated with the exhaust system, and a controller in electrical communication with the particulate sensor, wherein the controller is configured to determine a change in a rate of exhaust flow in the exhaust system, to compare the change in the rate of exhaust flow to a preselected threshold rate of change; and if the change in the rate of exhaust flow has a preselected relationship to the preselected threshold rate of change, then to determine a degradation of the sensor.

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We claim: 1. An apparatus, comprising: an internal combustion engine; an exhaust system in communication with the engine; a particulate sensor associated with the exhaust system; and a controller in electrical communication with the particulate sensor, wherein the controller is configured to determ

We claim: 1. An apparatus, comprising: an internal combustion engine; an exhaust system in communication with the engine; a particulate sensor associated with the exhaust system; and a controller in electrical communication with the particulate sensor, wherein the controller is configured to determine a change in a rate of exhaust flow in the exhaust system; to compare the change in the rate of exhaust flow to a preselected threshold rate of change; and if the change in the rate of exhaust flow has a preselected relationship to the preselected threshold rate of change, then to determine a degradation of the sensor. 2. The apparatus of claim 1, wherein the controller is configured to determine the degradation of the sensor by determining if an output of the particulate sensor has a preselected relationship to a predetermined sensor output threshold. 3. The apparatus of claim 2, wherein the controller is configured to determine a measure of particulate accumulation on an interior surface of the exhaust system upstream of the particulate sensor, and wherein the predetermined sensor output threshold value is associated with the measure of particulate matter accumulation. 4. The apparatus of claim 3, wherein the controller comprises memory comprising a plurality of predetermined sensor output threshold values stored thereon, each predetermined sensor output threshold value being associated with a corresponding measure of particulate matter accumulation. 5. The apparatus of claim 1, wherein the sensor comprises an image charge sensor. 6. The apparatus of claim 1, further comprising a particulate filter disposed along the exhaust system, wherein the sensor is disposed upstream of the particulate filter. 7. The apparatus of claim 1, further comprising a particulate filter disposed along the exhaust system, wherein the sensor is disposed downstream of the particulate filter. 8. The apparatus of claim 1, wherein the particulate sensor is a first particulate sensor, further comprising a second particulate sensor disposed along the exhaust system upstream of the particulate filter. 9. An apparatus, comprising: an internal combustion engine; an exhaust system in communication with the engine; an image charge sensor at least partially exposed to exhaust gases in the exhaust system; and a controller in electrical communication with the image charge sensor to determine a degradation of the sensor in response to an engine operating condition. 10. The apparatus of claim 9, wherein the controller is configured to determine the degradation of the sensor by comparing an output received from the sensor to a predetermined sensor output threshold value and determining whether the output received from the sensor has a predetermined relationship to the predetermined sensor output threshold value. 11. The apparatus of claim 10, wherein the controller is configured to determine a measure of particulate accumulation on an interior surface of the exhaust system upstream of the particulate sensor, and wherein the predetermined sensor output threshold value is associated with the measure of particulate matter accumulation. 12. The apparatus of claim 11, wherein the controller comprises memory comprising a plurality of predetermined sensor output threshold values stored thereon, each predetermined sensor output threshold value being associated with a corresponding measure of particulate matter accumulation. 13. The apparatus of claim 9, wherein the operating condition comprises an increase in a rate of exhaust flow. 14. The apparatus of claim 13, wherein the operating condition comprises an increase in the rate of exhaust flow being equal to or above a predetermined threshold exhaust flow rate increase.