Method and system for particulate filter leakage detection
First Claim
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1. A method, comprising:
- flowing exhaust from downstream of a first filter towards each of a first pressure sensor coupled at a first location in an exhaust pipe and a second pressure sensor coupled at a second location in a passage external to the exhaust pipe, the passage including a second filter coupled to an electric circuit; and
indicating degradation of the first filter based on an interval between successive regenerations of the second filter.
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Abstract
Methods and systems are provided for determining degradation of a particulate filter in an exhaust conduit. In one example, a method may include diverting exhaust gas to a secondary soot sensor assembly comprising a second filter downstream of a first filter, and determining degradation based on time intervals between subsequent filter regenerations of the second filter in the secondary soot sensor assembly.
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Citations
19 Claims
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1. A method, comprising:
flowing exhaust from downstream of a first filter towards each of a first pressure sensor coupled at a first location in an exhaust pipe and a second pressure sensor coupled at a second location in a passage external to the exhaust pipe, the passage including a second filter coupled to an electric circuit; and
indicating degradation of the first filter based on an interval between successive regenerations of the second filter.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An engine exhaust system, comprising:
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an exhaust pipe including a first particulate filter; a soot detection system including an inlet pipe and an outlet pipe coupled to the exhaust pipe, downstream of the first particulate filter, the inlet pipe merging into a passage external to the exhaust pipe, the outlet pipe merging out of the passage external to the exhaust pipe;
a second particulate filter coupled to the passage between the inlet pipe and the outlet pipe, the second particulate filter coupled to a source of electricity via a switch;a first pressure sensor at a first location in the exhaust pipe; a second pressure sensor at a second location in the passage external to the exhaust pipe; and a controller with computer readable instructions stored on non-transitory memory for; flowing a first portion of exhaust gas from downstream of the first filter towards the first pressure sensor; flowing a remaining portion of exhaust gas towards the second pressure sensor; regenerating the second filter based on output from first and the second pressure sensors; and adjusting engine operation based on a time elapsed between successive regenerations of the second filter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method, comprising:
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flowing exhaust gas from downstream of a particulate filter positioned in an engine exhaust conduit upstream of a first pressure sensor and a metal filter positioned upstream of a second pressure sensor in an exhaust bypass, the exhaust bypass external to the exhaust conduit, and adjusting engine operation based on degradation of the particulate filter, the degradation determined based on a time interval between a first regeneration and a second regeneration of the metal filter, the first regeneration and the second regeneration each performed based on a pressure difference between a pressure measured by the second pressure sensor and a pressure measured by the first pressure sensor. - View Dependent Claims (18, 19)
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Specification