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US 8,511,084 B2Granted
Method and system for a turbocharged engine
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
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Abstract
Methods and systems are provided for a boosted engine having a split intake system coupled to a split exhaust system. Aircharges of differing composition, pressure, and temperature may be delivered to the engine through the split intake system at different points of an engine cycle. In this way, boost and EGR benefits may be extended.
Claims18
A method of operating a turbocharged engine, comprising:
- in response to a tip-in detected by a sensor,
- adjusting cylinder valves to increase an amount of intake air and decrease an amount of recirculated exhaust gas delivered to a cylinder via a first intake passage while operating a compressor coupled to a second, different intake passage to increase an amount of boosted intake air delivered to the cylinder via the second intake passage for a duration since the tip-in.
A method of operating a boosted engine during an operating condition of the engine, comprising:
- drawing at least some recirculated exhaust gas at or below barometric pressure from one of two exhaust passages into an engine cylinder through a first intake passage;
- and
- drawing at least some fresh air at compressor pressure from a compressor into the cylinder through a second, separate intake passage coupled to the other of the two exhaust passages.
An engine system, comprising:
- an engine cylinder;
- a direct injector configured to directly inject an amount of fuel into the cylinder;
- a first intake passage communicatively coupled to a first exhaust passage, the first intake passage including a first intake valve for delivering an amount of recirculated exhaust gas to the cylinder;
- a second, separate intake passage communicatively coupled to a second, separate exhaust passage, the second intake passage including a second intake valve for delivering an amount of compressed fresh air to the cylinder;
- a turbocharger compressor coupled to the second intake passage, the compressor driven by a turbine coupled to the second exhaust passage;
- a valve actuator configured to open the first intake valve at a first intake valve timing and the second intake valve at a second, different intake valve timing;
- and
- a controller with computer readable instructions stored on a non-transitory computer-readable medium for adjusting a valve phase of the actuator to open the first intake valve at the first intake valve timing and the second intake valve at the second intake valve timing;
- wherein a first intake valve opening timing is earlier in an engine cycle intake stroke than a second intake valve opening timing.
6 more elements
Dependencies are inferred from the claim text.