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US 11,519,353 B2Granted
Method of operating an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorsDavid Hesketh, Aaron John Oakley
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for an engine. In one example, a method comprises stopping an engine via a soft-stop method in response to a likelihood of condensate forming being less than or equal to a threshold likelihood. The method further comprises stopping the engine via an exhaust gas evacuation method in response to the likelihood of condensate forming being greater than the threshold likelihood.
Claims18
A system, comprising:
- an engine comprising an exhaust gas recirculation passage fluidly coupled to an engine intake;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- actuate a valve of the exhaust gas recirculation passage to a closed position;
- maintain an intake throttle position for a period of time based on a position of the valve prior to being actuated to the closed position in response to an engine stop request when a likelihood of condensate formation is greater than a threshold likelihood, the likelihood of condensate based on one or more of an ambient humidity, an engine runtime, an engine temperature, an intake temperature, an exhaust temperature, and an amount of exhaust gas in the engine intake;
- and
- increase an engine speed relative to an idle engine speed during the engine stop request, wherein a fuel supply to the engine is cut after the period of time.
4 more elements
A system, comprising:
- an engine comprising an exhaust gas recirculation passage fluidly coupled to an engine intake;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- actuate a valve of the exhaust gas recirculation passage to a closed position;
- and
- maintain an intake throttle position for a period of time based on a position of the valve prior to being actuated to the closed position in response to an engine stop request when a likelihood of condensate formation is greater than a threshold likelihood,the likelihood of condensate is based on one or more of an ambient humidity, an engine runtime, an engine temperature, an intake temperature, an exhaust temperature, and an amount of exhaust gas in the engine intake, wherein a fuel supply to the engine is cut after the period of time,
- wherein the engine is arranged on a hybrid vehicle.
4 more elements
A method, comprising:
- in response to an engine stop request, selecting a first mode comprising actuating an EGR valve to a closed position and actuating a throttle valve to a closed position when a likelihood of condensate formation is less than a threshold likelihood, the likelihood of condensate is based on one or more of an ambient humidity, an engine runtime, an engine temperature, an intake temperature, an exhaust temperature, and an amount of exhaust gas in an engine intake;
- and
- selecting a second mode comprising actuating the EGR valve to the closed position and maintaining the throttle valve in an open position for at least a period of time based on a position of the EGR valve prior to the engine stop request when the likelihood of condensate formation is greater than the threshold likelihood, wherein a fuel supply to the engine is cut after the period of time.
A hybrid vehicle arrangement, comprising:
- an engine shaped to receive intake gas via an intake passage and exhaust gas via an exhaust-gas recirculation passage;
- and
- a controller with computer-readable instructions stored on non-transitory memory that when executed enable the controller to:
- decrease an engine fuel supply in the presence of an engine stop request;
- wherein
- the engine stop request is executed in a first mode when a likelihood of condensate formation is less than or equal to a threshold likelihood, the likelihood of condensate is based on one or more of an ambient humidity, an engine runtime, an engine temperature, an intake temperature, an exhaust temperature, and an amount of exhaust gas in the intake passage;
- and
- the engine stop request is executed in a second mode when the likelihood of condensate formation is greater than the threshold likelihood, wherein a fuel supply to the engine is cut after a period of time during which a throttle valve position is maintained.
5 more elements
Dependencies are inferred from the claim text.