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US 8,571,783 B2Granted
Controlling cylinder mixture and turbocharger operation
AssigneeFord Global Technologies, LLC
InventorsJulia Helen Buckland, Mrdjan J. Jankovic
Life of this patent
Estimating the term…
Abstract
A method for controlling differences in exhaust gas residual amount for a two cylinder bank engine having at least one turbocharger is presented. In one example, the description includes a method for adjusting valve timing to reduce cylinder exhaust gas residual variation.
Claims20
A method for controlling a V-engine with first and second cylinder banks, comprising:
- during exhaust backpressure differences between the banks, varying valve operation of cylinders in the second bank to increase torque as a waste gate position of a first turbocharger is adjusted, said first turbocharger having a turbine located in an exhaust of the first bank and a second turbocharger having a turbine located in an exhaust of the second bank;
- while
- varying position of a throttle to reduce flow rate and counteract the torque increase.
A method for controlling an engine, comprising:
- balancing mass flow through first and second engine cylinder groups varying valve operation of cylinders in the second cylinder group as a waste gate position of a first turbocharger is adjusted and while advancing ignition spark, said first turbocharger located in an exhaust path of the first cylinder group, the mass flow through the second cylinder group directed to a second turbocharger.
A method for controlling an engine, comprising:
- balancing mass flow through first and second engine cylinder groups varying valve timing operation of cylinders in the second cylinder group as a waste gate position of a first turbocharger is adjusted, said first turbocharger located in an exhaust path of the first cylinder group, the mass flow through the second cylinder group directed to a second turbocharger;
- while
- varying a throttle position upstream of both cylinder groups.
Dependencies are inferred from the claim text.