Cylinder deactivation expanded operational range with additional air source integrated with turbocharger
AssigneePACCAR Inc
InventorsTrevor Ott, Maarten Meijer, Stephen Ciatti, Brandon Rouse
Life of this patent
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Abstract
Providing additional mass air flow to an engine of a vehicle to expand an operating range of cylinder deactivation (CDA) is provided. Aspects of the present disclosure describe a method and system to provide additional mass air flow to an engine using an auxiliary air source coupled to a turbocharger. When a low air-to-fuel ratio state is determined in association with operating the vehicle in CDA mode, the auxiliary air source is activated to assist the turbocharger with increase the supply of supercharged intake air to the engine. Accordingly, the operating range of CDA is expanded.
Claims20
A method for extending an operating range of cylinder deactivation (CDA) mode of a diesel engine of a vehicle, comprising:
- determining a first energy cost associated with activating an auxiliary air source for the CDA mode using the auxiliary air source;
- determining a second energy cost associated with directly heating a catalyst;
- determining that the first energy cost is less than the second energy cost;
- determining, based at least in part on determining that the first energy cost is less than the second energy cost, to activate the CDA mode;
- sending at least one signal to deactivate at least one of a plurality of cylinders of the diesel engine;
- determining a target mass air flow range of intake air to the diesel engine that allows for continued CDA mode operation within an efficiency operating range;
- determining a mass air flow rate of the diesel engine;
- and
- when the mass air flow rate is determined to be below the target mass air flow range, sending at least one signal to cause the auxiliary air source to increase the mass air flow rate to reach at least the target mass air flow range.
A vehicle including:
- a diesel engine including a plurality of cylinders;
- and
- an engine control unit, comprising:
- at least one processor;
- and
- memory coupled to the at least one processor including instructions that, when executed by the at least one processor, cause the engine control unit to:
- determine a first energy cost associated with activating an auxiliary air source for a cylinder deactivation (CDA) mode using the auxiliary air source;
- determine a second energy cost associated with directly heating a catalyst;
- determine that the first energy cost is less than the second energy cost;
- determine, based at least in part on determining that the first energy cost is less than the second energy cost, to activate the CDA mode;
- send at least one signal to deactivate at least one of the plurality of cylinders of the diesel engine;
- determine a target mass air flow range of intake air to the diesel engine that allows for continued CDA mode operation within an efficiency operating range;
- determine a mass air flow rate of the diesel engine;
- and
- when the mass air flow rate is determined to be below the target mass air flow range, sending at least one signal to cause the auxiliary air source to increase the mass air flow rate to reach at least the target mass air flow range.
A system for extending an operating range of cylinder deactivation (CDA) mode, comprising:
- at least one processor;
- and
- memory coupled to the at least one processor including instructions that, when executed by the at least one processor, cause the system to:
- determining a first energy cost associated with activating an auxiliary air source for a CDA mode using the auxiliary air source;
- determining a second energy cost associated with directly heating a catalyst;
- determining that the first energy cost is less than the second energy cost;
- determining, based at least in part on determining that the first energy cost is less than the second energy cost, to activate the CDA mode;
- sending at least one signal to deactivate at least one of a plurality of cylinders of a diesel engine;
- determining a target mass air flow range of intake air to the diesel engine that allows for continued CDA mode operation within an efficiency operating range;
- determining a mass air flow rate of the diesel engine;
- and
- when the mass air flow rate is determined to be below the target mass air flow range, sending at least one signal to cause the auxiliary air source to increase the mass air flow rate to reach at least the target mass air flow range.
Dependencies are inferred from the claim text.