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US 11,572,844 B2Granted
Methods and system for stopping an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorsJeffrey Allen Doering, Chris Paul Glugla, Imtiaz Ali
Life of this patent
Estimating the term…
Abstract
A method for stopping an engine within a desired crankshaft angular range is disclosed. In one example, the method may take no control actions if it is determined that the engine will stop within the desired crankshaft angular range. However, if it is determined that the engine may stop outside of the desired crankshaft angular range, expansion combustion may be initiated in a cylinder so that the engine stops in a desired crankshaft angular range.
Claims20
A method for operating an engine, comprising:
- in response to an engine stop request, ceasing fuel injection to the engine and subsequently injecting fuel into a cylinder that is on an expansion stroke prior to the engine ceasing rotation in response to the engine stop request, the injecting the fuel in further response to engine speed being greater than a first threshold speed and less than a second threshold speed;
- and
- combusting the fuel injected during the expansion stroke to rotate the engine past one or more crankshaft angles before the engine ceases rotation in response to the engine stop request.
A vehicle system, comprising:
- an internal combustion engine;
- and
- a controller including executable instructions stored in non-transitory memory for:
- in response to an engine stop request, ceasing fuel injection to the engine and subsequently injecting fuel to a cylinder of the internal combustion engine that is on an expansion stroke prior to the engine ceasing rotation in response to the engine stop request, the injecting fuel in further response to a speed of the internal combustion engine being above a first speed threshold and below a second speed threshold;
- and
- combusting the fuel injected during the expansion stroke to rotate the engine past an undesirable engine crankshaft stopping position to a crankshaft angle at which the engine ceases rotation in response to the engine stop request.
3 more elements
A method for operating an engine, comprising:
- in response to an engine stop request, ceasing fuel injection to the engine and subsequently injecting fuel to a cylinder that is on an expansion stroke prior to the engine ceasing rotation in response to the engine stop request, the injecting fuel in further response to engine speed being greater than a first threshold speed and less than a second threshold speed, where the fuel is injected at a crankshaft angle that is based on a desired crankshaft angle delay from end of fuel injection timing to timing of ignition of the fuel;
- and
- combusting the fuel injected on the expansion stroke to increase energy of the engine to change a crankshaft angle at which the engine ceases rotation in response to the engine stop request.
Dependencies are inferred from the claim text.