PARTICULATE MATTER FILTER DIAGNOSTIC TECHNIQUES BASED ON EXHAUST GAS ANALYSIS
First Claim
1. A diagnostic system for a particulate matter (PM) filter of an exhaust system, the diagnostic system comprising:
- at least one gas sensor configured to measure a gas component of exhaust gas flowing through the exhaust system and the PM filter; and
a controller configured to;
calculate a conversion efficiency of the gas component by the PM filter;
compare the conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst; and
determine whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold.
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Accused Products
Abstract
A diagnostic system and method for diagnosing the performance of a particulate matter (PM) filter of an exhaust system each involve receiving, by a controller from at least one sensor, a gas component measurement of exhaust gas flowing through the exhaust system and the PM filter. The controller calculates a conversion efficiency of the gas component by the PM filter and compares the calculated conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst. The controller then determines whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold.
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Citations
19 Claims
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1. A diagnostic system for a particulate matter (PM) filter of an exhaust system, the diagnostic system comprising:
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at least one gas sensor configured to measure a gas component of exhaust gas flowing through the exhaust system and the PM filter; and a controller configured to; calculate a conversion efficiency of the gas component by the PM filter; compare the conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst; and determine whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for diagnosing the performance of a particulate matter (PM) filter of an exhaust system, the method comprising:
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receiving, by a controller from at least one sensor, measurements of a gas component of exhaust gas flowing through the exhaust system and the PM filter; calculating, by the controller, a conversion efficiency of the gas component by the PM filter; comparing, by the controller, the conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst; and determining, by the controller, whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification