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US 2021/0262407 A1Published application
System and method for warming an emissions device of an engine exhaust system
AssigneeFord Global Technologies, LLC
InventorsEric Matthew Kurtz, Jason Brian Martz
Life of this patent
Estimating the term…
Abstract
Methods and systems for increasing exhaust gas temperatures of an engine are described. In one example, engine exhaust gas temperatures may be increased via deactivating cylinders and flowing exhaust gases through deactivated cylinder. Engine pumping losses may be reduced via the exhaust gases that flow through the deactivated cylinder so as to reduce engine fuel consumption while heating an exhaust gas after treatment device.
Claims20
An engine operating method, comprising:
- deactivating a cylinder and holding an intake poppet valve of the cylinder open for an entire duration of a cycle of an engine that includes the cylinder;
- and
- operating an exhaust valve of the cylinder during the cycle.
An engine system, comprising:
- a diesel engine including a cylinder included in a first group of cylinders, a second group of cylinders, a central throttle, and an exhaust after treatment device, the cylinder including at an intake poppet valve and a decompression actuator to lift the intake poppet valve;
- a controller including executable instructions stored in non-transitory memory that cause the controller to deactivate the cylinder and other cylinders included in a first group of cylinders while operating cylinders in the second group of cylinders in response to a request to heat the engine exhaust after treatment system, and additional instructions to hold the intake poppet valve open during an entire cycle of the diesel engine in response to the request to heat the engine exhaust gas after treatment system.
An engine operating method, comprising:
- opening a central throttle of an engine and holding closed a port throttle of a cylinder of the engine during at least a portion of an expansion stroke of the cylinder in response to a request to heat an engine exhaust gas after treatment system, the intake stroke of the cylinder occurring during a cycle of the engine;
- and
- holding open the port throttle during at least part of an exhaust stroke of the cylinder, the exhaust stroke of the cylinder occurring during the cycle of the engine.
Dependencies are inferred from the claim text.