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US 2019/0360417 A1Published application
Method of operating an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorsDavid Hesketh, Aaron John Oakley
Life of this patent
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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.
Claims20
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.
3 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;
- and
- selecting a second mode comprising actuating the EGR valve to the closed position and maintain 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.
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;
- and
- the engine stop request is executed in a second mode when the likelihood of condensate formation is greater than the threshold likelihood.
5 more elements
Dependencies are inferred from the claim text.