Method and apparatus for monitoring ash accumulation in a particulate filter of an emission abatement assembly
First Claim
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1. A method of monitoring ash buildup in a particulate filter of an emission abatement assembly, the method comprising the steps of:
- providing an emission abatement assembly comprising a fuel-fired burner positioned upstream of a particulate filter,determining a pressure drop across the particulate filter as a function of exhaust mass flow from an engine to trigger filter regeneration, experimentally generating a data table by mapping pressure drops across the particulate filter as a function of exhaust mass flow at various particulate loading, storing the data table in an electronic controller, determining a current pressure drop across the particulate filter, determining a current mass flow, querying the data table to retrieve an experimentally created limit value that corresponds to the current exhaust mass flow, comparing the current pressure drop to the limit value, and commencing a regenerating cycle if the current pressure drop exceeds the limit value,selectively operating the fuel-fired burner to regenerate the particulate filter to remove soot accumulated therein,generating a control signal subsequent to the regenerating step, anddetermining a level of ash accumulation in the particulate filter in response to generation of the control signal.
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Abstract
A method of monitoring ash buildup in a particulate filter includes determining particulate accumulation in the filters subsequent to filter regeneration to determine when the filter is in need of servicing to remove ash there from. An emission abatement assembly is also disclosed.
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Citations
24 Claims
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1. A method of monitoring ash buildup in a particulate filter of an emission abatement assembly, the method comprising the steps of:
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providing an emission abatement assembly comprising a fuel-fired burner positioned upstream of a particulate filter, determining a pressure drop across the particulate filter as a function of exhaust mass flow from an engine to trigger filter regeneration, experimentally generating a data table by mapping pressure drops across the particulate filter as a function of exhaust mass flow at various particulate loading, storing the data table in an electronic controller, determining a current pressure drop across the particulate filter, determining a current mass flow, querying the data table to retrieve an experimentally created limit value that corresponds to the current exhaust mass flow, comparing the current pressure drop to the limit value, and commencing a regenerating cycle if the current pressure drop exceeds the limit value, selectively operating the fuel-fired burner to regenerate the particulate filter to remove soot accumulated therein, generating a control signal subsequent to the regenerating step, and determining a level of ash accumulation in the particulate filter in response to generation of the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of monitoring ash buildup in a particulate filter of an emission abatement assembly, the method comprising the steps of:
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providing an emission abatement assembly comprising a fuel-fired burner operable to generate heat which oxidizes soot trapped in a particulate filter, determining a pressure drop across the particulate fitter as a function of exhaust mass flow from an engine to trigger filter regeneration, experimentally generating a data table by mapping pressure drops across the particulate filter as a function of exhaust mass flow at various particulate loadings, storing the data table in an electronic controller, determining a current pressure drop across the particulate filter. determining a current mass flow, querying the data table to retrieve an experimentally created limit value that corresponds to the current exhaust mass flow, comparing the current pressure drop to the limit value, and commencing a regenerating cycle if the current pressure drop exceeds the limit value, determining an end of a regeneration cycle of the particulate filter which comprises determining when fuel ceases to be supplied to the fuel-fired burner, and generating a control signal in response thereto, and determining a level of ash accumulation in the particulate filter in response to generation of the control signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification