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US 8,007,404 B2Granted
Transmission shift signal for aftertreatment device control
AssigneeEaton Corporation
InventorsDmitry Arie Shamis, Matthew Richard Busdiecker, Johannes Walter Reuter
Life of this patent
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Abstract
Discontinuous torque ratio shifts by a transmission can result in complex transient exhaust conditions that can adversely affect exhaust air-fuel ratio control, which can result in ineffective regeneration. In extreme cases, the result can be irreversible damage to exhaust system components. The inventors' concept is to alter either regeneration scheduling or shift scheduling to avoid shifting while regenerating.
Claims20
A method of operating a power generation system, comprising:
- operating a diesel engine to produce exhaust comprising NOX;
- transmitting power from the diesel engine through a transmission capable of discontinuously shifting between torque ratios;
- passing the exhaust through an exhaust aftertreatment system comprising a lean NOX trap to adsorb a portion of the NOX from the exhaust;
- timing denitration of the lean NOX trap based on a criteria relating to the state and/or the performance of the exhaust aftertreatment system, or a portion thereof comprising the lean NOX trap;
- and
- varying the denitration timing to avoid denitrating while the transmission is discontinuously shifting;
- wherein denitrating the lean NOX trap comprises providing an overall rich exhaust-reductant mixture to the lean NOX trap, whereby the lean NOX trap releases and reduces stored NOX.
4 more elements
A method of operating a power generation system, comprising:
- operating a diesel engine to produce exhaust comprising NOX;
- transmitting power from the diesel engine through a transmission that discontinuously shifts between torque ratios;
- passing the exhaust through an exhaust aftertreatment system comprising a lean NOX trap to adsorb a portion of the NOX from the exhaust;
- timing denitration of the lean NOX trap based on a criteria relating to the state and/or the performance of the exhaust aftertreatment system, or a portion thereof comprising the lean NOX trap;
- and
- varying the timing of the discontinuous shifts to avoid discontinuously shifting while denitrating the lean NOX trap;
- wherein denitrating the lean NOX trap comprises providing an overall rich exhaust-reductant mixture to the lean NOX trap, whereby the lean NOX trap releases and reduces stored NOX.
4 more elements
Dependencies are inferred from the claim text.