Controlling an engine with adjustable intake valve timing
AssigneeFord Global Technologies, LLC
InventorsMichael Pozar, Robert Stein, Jeff C. Lyjak, Marcus W. Fried, Thomas G. Leone
Life of this patent
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Abstract
A system and method to control an engine wherein at least intake valve timing is retarded relative to a crankshaft position depending on engine operating conditions. According to the method, at least a portion of the fuel is injected during the intake valve open period with retarded valve timing. The method can reduce fuel consumption, reduce transient fuel requirements, improve engine performance, and reduce CO emissions, at least under some conditions.
Claims29
A method of delivering fuel to an internal combustion engine having intake valve timing that may be adjusted relative to crankshaft position, the method comprising:
- operating at least one cylinder of said internal combustion engine with at least one intake valve having an opening position at a crankshaft angle that is after top-dead-center, relative to an intake stroke of said cylinder, said intake valve opening position also being in advance of a closing of an exhaust valve in said cylinder;
- and
- injecting at least a portion of an injected fuel amount to said cylinder at least while said intake valve is open.
A method of delivering fuel to an internal combustion engine having intake valve and exhaust valve timing that may be adjusted relative to crankshaft position, the method comprising:
- adjusting at least one intake valve opening position, in at least one cylinder of said internal combustion engine, to a crankshaft angle that is retarded at least 5° after top-dead-center, relative to an intake stroke of said cylinder, in response to at least on an engine operating condition;
- adjusting at least one exhaust valve closing, in said at least one cylinder, to a crankshaft angle that is retarded from said intake valve opening;
- and
- injecting at least a portion of an injected fuel amount to said cylinder at least while said intake valve is open.
A method of delivering fuel to an internal combustion engine having intake valve and exhaust valve timing that may be adjusted relative to crankshaft position, the method comprising:
- adjusting at least one intake valve opening position, in at least one cylinder of said internal combustion engine, to a crankshaft angle that is retarded from top-dead-center, relative to an intake stroke of said cylinder;
- adjusting at least one exhaust valve closing, in said at least one cylinder, to a crankshaft angle that is retarded from said intake valve opening;
- injecting fuel to said cylinder at a first injection timing, during a first engine operating condition;
- and
- injecting fuel to said cylinder at a second injection timing, during a second engine operating condition, said first engine operating condition different from said second engine operating condition.
A system to deliver fuel to an internal combustion engine having intake valve timing that may be adjusted relative to crankshaft position, the system comprising:
- at least an intake port centerline positioned at least 40°, relative to a plane of the face of at least an intake valve, and an injector targeting at least a portion of said intake valve from the stem side of said intake valve;
- an intake valve timing means to adjust said intake valve timing relative to a crankshaft position;
- and
- a controller to adjust, by said intake valve timing means, at least the opening position of said at least one intake valve, in at least one cylinder of said internal combustion engine, to a crankshaft angle that is retarded from top-dead-center, relative to an intake stroke of said cylinder, and said intake valve opening position is in advance of an exhaust valve closing in said cylinder, and to inject fuel from said injector to said cylinder at least while said intake valve is open.
A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said storage medium comprising:
- instructions for operating at least one cylinder of said internal combustion engine with at least one intake valve having an opening position at a crankshaft angle that is after top-dead-center, relative to an intake stroke of said cylinder, said intake valve opening position also being in advance of a closing of an exhaust valve in said cylinder;
- and
- instructions for injecting at least a portion of an injected fuel amount to said cylinder at least while said intake valve is open.
Dependencies are inferred from the claim text.