Integrated diesel particulate trap pressure sensor
First Claim
1. Apparatus for monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, which combustion engine comprises a plurality of combustion cylinders and is provided with means defining a feedback path for causing a portion of the exhaust gas from the cylinders to flow back to an inlet of the cylinders, there being provided within the feedback path a pressure sensor for measuring the pressure of the gas within the feedback path and for generating an output signal in response thereto, the apparatus comprising:
- means for evaluating the output signal to determine whether the pressure within the feedback path has exceeded a predetermined value; and
means responsive to a positive determination of the evaluating means for providing an indication of an unacceptable condition of the particulate filter.
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Accused Products
Abstract
An apparatus for monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, the apparatus comprising: means defining an exhaust gas recirculation (EGR) passage; means located within said exhaust gas recirculation (EGR) passage for sensing pressure and generating a signal indicative thereof; and computing means arranged to derive a pressure reduction value corresponding to the signal generated by said pressure-sensing means. The computing means will then determine whether said pressure reduction value exceeds a predetermined value and provide an indication of an unacceptable condition of the particulate filter.
8 Citations
21 Claims
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1. Apparatus for monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, which combustion engine comprises a plurality of combustion cylinders and is provided with means defining a feedback path for causing a portion of the exhaust gas from the cylinders to flow back to an inlet of the cylinders, there being provided within the feedback path a pressure sensor for measuring the pressure of the gas within the feedback path and for generating an output signal in response thereto, the apparatus comprising:
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means for evaluating the output signal to determine whether the pressure within the feedback path has exceeded a predetermined value; and means responsive to a positive determination of the evaluating means for providing an indication of an unacceptable condition of the particulate filter. - View Dependent Claims (2, 7, 9)
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3. Apparatus for monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, the apparatus comprising;
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means defining an exhaust gas recirculation (EGR) passage; means located within said exhaust gas recirculation (EGR) passage for sensing pressure and generating a signal indicative thereof; and computing means arranged to derive a pressure reduction value corresponding to the signal generated by said pressure-sensing means and to determine whether said pressure reduction value exceeds a predetermined value, thereby to provide an indication of an unacceptable condition of the particulate filter. - View Dependent Claims (4, 5, 6, 8)
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10. A method of monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, which combustion engine comprises a plurality of combustion cylinders and is provided with means defining a feedback path for causing a portion of the exhaust gas from the cylinders to flow back to an inlet of the cylinders, there being provided within the feedback path a pressure sensor for measuring the pressure of the gas within the feedback path and for generating an output signal in response thereto, the method comprising:
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evaluating the output signal to determine whether the pressure within the feedback path has exceeded a predetermined value; and responding to a positive determination that the predetermined value has been exceeded, thereby to provide an indication of an unacceptable condition of the particulate filter. - View Dependent Claims (11, 15, 17, 19, 21)
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12. A method for monitoring the condition of a particulate filter situated in an exhaust of a combustion engine, comprising the steps of:
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sensing pressure of exhaust gas within a means defining an exhaust gas recirculation (EGR) passage using a pressure sensor; generating a signal indicative of said pressure to a computing means; deriving a pressure reduction value indicative of said pressure value; and determining whether said pressure reduction value exceeds a predetermined value, thereby to provide an indication of an unacceptable condition of the particulate filter. - View Dependent Claims (13, 14, 16, 18, 20)
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Specification