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US 10,107,208 B2Granted
System and method to operate an engine
AssigneeFord Global Technologies, LLC
InventorsMatthew Gerow, John Eric Rollinger, Adam J. Richards
Life of this patent
Estimating the term…
Abstract
Systems and methods for controlling operation of deactivated engine cylinders are presented. In one example, intake valve timing of deactivated engine cylinders is advanced to reduce amplitudes of intake pressure pulsations while exhaust valves of the deactivated engine cylinders are held closed. Further, intake valve timing of deactivated cylinders may be advanced responsive to output of an intake manifold pressure sensor.
Claims20
An engine method, comprising:
- holding exhaust valves of a cylinder of an engine closed and operating intake valves of the cylinder while rotating the engine through an engine cycle;
- and
- advancing intake valve timing of the cylinder while rotating the engine through the engine cycle.
An engine method, comprising:
- deactivating an engine cylinder and holding exhaust valves of the engine cylinder closed over an entire engine cycle while intake valves of the engine cylinder open and close in response to engine operating conditions;
- and
- advancing intake valve timing of the engine cylinder while the engine cylinder is deactivated, the intake valve timing is advanced until an amplitude of an intake manifold pressure pulse is less than a threshold.
An engine system, comprising:
- an engine;
- a controller including executable instructions stored in non-transitory memory to deactivate exhaust valves of a cylinder in a closed position over an entire engine cycle, advance intake valve timing of the cylinder while the exhaust valves of the cylinder are deactivated in the closed position, and limit advance of intake valve timing in response to intake manifold pressure pulse amplitude.
Dependencies are inferred from the claim text.