Method and apparatus for shutting down a fuel-fired burner of an emission abatement assembly
First Claim
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1. A method of operating a fuel-fired burner of an emission abatement assembly, the method comprising the steps of:
- supplying a first flow rate of fuel to the fuel-fired burner during regeneration of a particulate filter, detecting a burner shutdown request, supplying a second flow rate of fuel to the fuel-fired burner for a predetermined period of time in response to detection of the shutdown request, the second flow rate of fuel being less than the first flow rate of fuel, and ceasing to supply fuel to the fuel-fired burner after the predetermined period of time has elapsed.
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Abstract
A method of operating a fuel-fired burner of an emission abatement assembly includes supplying a reduced amount of fuel to the fuel-fired burner in response to detection of a burner shutdown request. Such a reduced fuel supply continues for a predetermined time period after which fuel is no longer supplied to the burner. The supply of both combustion air and atomization air, along with spark generation, continues for a period of time after the fuel is shutoff. An emission abatement assembly is also disclosed.
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Citations
19 Claims
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1. A method of operating a fuel-fired burner of an emission abatement assembly, the method comprising the steps of:
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supplying a first flow rate of fuel to the fuel-fired burner during regeneration of a particulate filter, detecting a burner shutdown request, supplying a second flow rate of fuel to the fuel-fired burner for a predetermined period of time in response to detection of the shutdown request, the second flow rate of fuel being less than the first flow rate of fuel, and ceasing to supply fuel to the fuel-fired burner after the predetermined period of time has elapsed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a fuel-fired burner of an emission abatement assembly, the method comprising the steps of:
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advancing a flow of atomization air to the fuel-fired burner, injecting a first amount of fuel into the flow of atomization air during regeneration of a particulate filter, detecting a burner shutdown request, injecting a second amount of fuel into the flow of atomization air in response to detection of the shutdown request, the second amount of fuel being less than the first amount of fuel, and ceasing to inject fuel into the flow of atomization air after the predetermined period of time has elapsed. - View Dependent Claims (10, 11, 12, 13)
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14. An emission abatement assembly, comprising:
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a particulate filter, a fuel-fired burner positioned upstream of the particulate filter, an electronically-controlled fuel delivery assembly operable to deliver fuel to the fuel fired burner, and a controller electrically coupled to the fuel delivery assembly, the controller comprising (i) a processor, and (ii) a memory device electrically coupled to the processor, the memory device having stored therein a plurality of instructions which, when executed by the processor, cause the processor to;
operate the fuel delivery assembly to supply a first flow rate of fuel to the fuel-fired burner during regeneration of the particulate filter, detect a burner shutdown request, operate the fuel delivery assembly to supply a second flow rate of fuel to the fuel-fired burner for a predetermined period of time in response to detection of the shutdown request, the second flow rate of fuel being less than the first flow rate of fuel, and operate the fuel delivery assembly to cease to supply fuel to the fuel-fired burner after the predetermined period of time has elapsed. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification