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US 7,621,126 B2Granted
Method for controlling cylinder air charge for a turbo charged engine having variable event valve actuators
AssigneeFord Global Technoloigies, LLC
InventorsIlya Kolmanovsky, Alex Gibson, Donald Lewis
Life of this patent
Estimating the term…
Abstract
A method for controlling cylinder air charge of an engine having a compressor is presented. In one example, the description includes a method for coordinating the control of the throttle, turbo charger, and valves such that the desired cylinder air charge may be achieved while engine pumping work may be decreased.
Claims11
A method for controlling an internal combustion engine, the method comprising:
- operating said engine in a first mode wherein a cylinder air amount is controlled by adjusting the opening amount of an electrically controlled throttle located upstream of an intake manifold, adjusting the speed of a turbo charger compressor communicating air flow to said engine, and adjusting the timing of at least an intake valve, where the first mode includes non-degraded valve or valve control operation;
- operating said engine in a second mode wherein said cylinder air amount is controlled by adjusting the opening amount of said electrically controlled throttle, and by controlling the speed of said turbo charger compressor, and operating said at least the intake valve at a fixed timing, where the second mode includes degraded valve control operation;
- and
- selecting between said first mode and said second mode in response to the valve control degradation.
1 more element
A method for controlling an internal combustion engine, the method comprising:
- adjusting timing of an electrically actuated intake valve downstream of a throttle to vary an air charge of a cylinder as the air flowing out of a turbo charger compressor varies, and
- during engine acceleration, limiting an adjustment rate of the timing in response to pressure in an intake manifold downstream of said throttle so that air flow through said engine is less than or equal to air flow rate of said turbo charger compressor during said acceleration, where said adjusting monotonically increases a cylinder air charge as output torque is requested to increase from a lower value to a higher value.
Dependencies are inferred from the claim text.