PARTICULATE MATTER SENSOR
First Claim
1. A particulate matter sensor for sensing particulate matter present in exhaust gasses flowing from an upstream end to a downstream end of an exhaust conduit for an internal combustion engine, said particulate matter sensor comprising:
- a sensing element with a sensing face, said sensing face configured to extend into said exhaust conduit, and further configured to provide a signal indicative of an amount of particulate matter detected in said exhaust conduit;
an inner shield surrounding said sensing face and having an inner shield inlet passage for admitting exhaust gases into said inner shield to be sensed by said sensing face, said inner shield also having an exit passage to allow exhaust gases to exit said inner shield; and
an outer shield surrounding a portion of said inner shield to define an outer shield chamber extending axially beyond said inner shield, said outer shield having an outer shield inlet passage configured for communicating exhaust gases into said outer shield chamber from said upstream end of said exhaust conduit, wherein exhaust gases enter said inner shield from said outer shield chamber.
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Accused Products
Abstract
A particulate matter sensor is provided for sensing particulate matter present in exhaust gases in a conduit. The particulate matter sensor includes a sensing element with a sensing face which extends into the exhaust conduit and provides a signal indicative of the amount of particulate matter detected in the exhaust conduit. An inner shield is provided to surround the sensing face and includes an inner shield inlet for admitting exhaust gases therein to be sensed. An outer shield surrounds a portion of the inner shield and defines an outer shield chamber extending axially beyond the inner shield. The outer shield has an outer shield inlet passage to receive exhaust gasses from the conduit. Exhaust gases enter the inner shield from the outer shield chamber through the inner shield inlet.
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Citations
33 Claims
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1. A particulate matter sensor for sensing particulate matter present in exhaust gasses flowing from an upstream end to a downstream end of an exhaust conduit for an internal combustion engine, said particulate matter sensor comprising:
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a sensing element with a sensing face, said sensing face configured to extend into said exhaust conduit, and further configured to provide a signal indicative of an amount of particulate matter detected in said exhaust conduit; an inner shield surrounding said sensing face and having an inner shield inlet passage for admitting exhaust gases into said inner shield to be sensed by said sensing face, said inner shield also having an exit passage to allow exhaust gases to exit said inner shield; and an outer shield surrounding a portion of said inner shield to define an outer shield chamber extending axially beyond said inner shield, said outer shield having an outer shield inlet passage configured for communicating exhaust gases into said outer shield chamber from said upstream end of said exhaust conduit, wherein exhaust gases enter said inner shield from said outer shield chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An exhaust system for an internal combustion engine, said exhaust system having an exhaust conduit with an upstream end, a downstream end, and a particulate matter sensor for sensing particulate matter present in exhaust gasses flowing from said upstream end to said downstream, wherein said particulate matter sensor comprises:
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a sensing element with a sensing face extending into said exhaust conduit and configured to provide a signal indicative of an amount of particulate matter detected in said exhaust conduit; an inner shield surrounding said sensing face and having an inner shield inlet passage for admitting exhaust gases into said inner shield to be sensed by said sensing face, said inner shield also having an exit passage to allow exhaust gases to exit said inner shield; an outer shield surrounding a portion of said inner shield to define an outer shield chamber extending axially beyond said inner shield, said outer shield having an outer shield inlet passage for communicating exhaust gases into said outer shield chamber from said upstream end of said exhaust conduit, wherein exhaust gases enter said inner shield from said outer shield chamber. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification