International Engine Intellectual Property Company, LLC

Daniel Cornelius

Luis Carlos Cattani

Qianfan Xin

Laura M Ricart-Ugaz

Rogelio Rodriguez

William De Ojeda

John R Zagone

Jeremy Grant Schipper

Michael Uchanski

Dileep Khadilkar

James R Cigler

Jer Sheng Chen

Shree C Kanchanavally

A method of setting actuator position of a variable geometry turbine linked to drive a compressor for a compression ignition engine using exhaust gas recirculation. The method includes detecting an engine transient event; determining current mass air flow through the compressor and exhaust temperature; resetting variable geometry turbine position to maximize mass air flow through the compressor; adding the maximum allowable quantity of fuel; determining exhaust temperature increase; adjusting exhaust pressure to allow an increase in mass air flow and exhaust temperature; and returning to the resetting step until a limit is reached.

Control method for variable geometry exhaust turbine

An engine control system coordinates control of a pressure regulating mechanism associated with a turbocharger turbine and control of a variable valve actuating (VVA) mechanism for expanding the range of possible exhaust gas recirculation rates over a large portion of an engine operating map to provide EGR rates which are greater than typical present-day levels while mitigating engine pumping losses by causing the turbocharger to operate with better efficiency in some regions of the map where it otherwise would not. Turbocharger efficiency is improved by controlling the VVA mechanism to set the timing of operation of its respective cylinder valves in accordance with a predetermined correlation of operating efficiencies of a compressor to timing of operation of respective engine cylinder valves, causing the compressor to operate at points of better efficiency than it otherwise would without use of VVA.

Coordinating variable valve actuation and turbocharger operation in an internal combustion engine

When the difference by which pressure in an engine exhaust manifold exceeds pressure in an engine intake manifold becomes less than a selected difference while an intake valve operating mechanism is closing cylinder intake valves at a selected time in the engine cycle, while an EGR system is conveying the engine exhaust component of an air/exhaust mixture from an exhaust system to an intake system, and a certain quantity of NOx is present in engine exhaust entering the exhaust manifold, the quantity of NOx present in engine exhaust entering the exhaust manifold is reduced below that certain quantity by causing the intake valve operating mechanism to close the cylinder intake valves earlier in the engine cycle than the selected time.

VVA control of NOx in a low &#x394;P area of an engine operating map

A mechanism () for enabling an engine cylinder valve () to close at various times during engine cycles has a hydraulic actuator () and a control valve () controlling the hydraulic actuator a) to constrain a pivot axis of a valve rocker () against relocation while the cylinder valve is being forced increasingly open, and b) to release the constraint after the cylinder valve has been forced open for enabling the pivot axis to relocate so that the intake valve can close early thereby providing early IVC. A hydraulic snubber () snubs closing motion of the cylinder valve through a scheduling geometry to a hydraulic accumulator (). The control valve opens to the accumulator to allow the rocker pivot axis to relocate and provide early IVC and closes to return the pivot axis to a location that doesn't provide early IVC.

Intake valve closing hydraulic adjuster

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Chicago, IL, United States of America

Daniel Cornelius