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US 11,105,291 B1Granted
Methods and systems for unsticking engine poppet valves
AssigneeFord Global Technologies, LLC
InventorMichiel J. Van Nieuwstadt
Life of this patent
Estimating the term…
Abstract
Systems and methods for unsticking intake and exhaust valves of an engine are described. In one example, valves that may be adjustably timed relative to an engine crankshaft position may be adjusted to unstick intake and/or exhaust valve that are stuck open or closed. In addition, fuel injection timing and spark timing may be adjusted in an effort to unstick intake and/or exhaust valves.
Claims20
An engine operating method, comprising:
- fully closing one or more valves of a cylinder of an engine within a predetermined crankshaft angle of a piston of the cylinder being at a top-dead-center compression stroke position such that all valves of the cylinder are closed in response to one or more exhaust valves of the cylinder being stuck closed;
- and
- commanding the one or more exhaust valves of the cylinder that are stuck closed to open when the piston is within a predetermined crankshaft angle of the top-dead-center compression stroke position.
A vehicle system, comprising:
- an engine including adjustable timing intake and exhaust valves;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to hold a first exhaust valve of a cylinder closed during an exhaust stroke of the cylinder in response to a second exhaust valve of the cylinder being stuck in an open position.
An engine operating method, comprising:
- holding closed two exhaust valves of a cylinder of an engine fully closed during an exhaust stroke of the cylinder in response to one or more intake valves of the cylinder being stuck open.
Dependencies are inferred from the claim text.