International Engine Intellectual Property Company, LLC

Qianfan Xin

Martin R Zielke

Luis Carlos Cattani

Laura M Ricart-Ugaz

Daniel Cornelius

Paul Gottemoller

Ning Lei

Steven Joseph Dickerson

John L Cagney

Michael D Bartkowicz

Antoun Y Calash

Steve Gravante

Timothy J Prochnau

Richard Franzwa

Dirk Jungen

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 control system and method for engine braking for a includes an engine braking control and at least one exhaust valve actuator responsive to demands from the braking control for causing the exhaust valve to open. The braking control is configured to command the exhaust valve actuator to substantially open and substantially close the exhaust valve at least twice during each engine cycle, a first event and a second event, when the pressure within the exhaust manifold is greater than the pressure in the cylinder. The braking control can also command the exhaust valve actuator to substantially open and substantially close during a third event between the first and second events.

High-temperature-flow engine brake with valve actuation

An engine braking system includes a turbocharger having a turbine and a compressor. An exhaust manifold includes a first pipe for channeling a first portion of the engine exhaust and a second pipe for channeling a second portion of the engine exhaust. The first and second pipes are connected to an inlet of the turbine. A cross pipe, as part of an exhaust gas recirculation (EGR) conduit, is open between the first and second pipes and at one end to the remaining portion of the EGR conduit. A valve can be arranged within the cross pipe and ca be operable in a first mode of operation to block flow between the first and second pipes and allow flow between the first pipe and the remaining portion of the EGR conduit and to allow flow between the first and second pipes and the inlet of the turbine. The valve is operable in a second mode of operation to allow flow between the first and second pipes, and to reduce or block flow between the second pipe and the turbine inlet.

Exhaust system for engine braking

A control system for engine braking for a vehicle powered by a turbocharged engine uses a supercharger to assist a turbocharger compressor to boost turbocharger air flow into the engine cylinders. An engine driven air pumping device draws ambient air, or alternately exhaust gas through the pump inlet, compresses the air, and delivers the compressed air through the pump outlet to the turbocharger compressor inlet or alternately the turbocharger compressor outlet. The increased air flow into the cylinders and out of the cylinder exhaust valves increases retarding power of the vehicle.

Supercharged boost-assist engine brake

An internal combustion engine () includes an intake manifold () and at least one exhaust manifold (). A first compressor () that is operably associated with a first turbine () has a first air inlet () and a first air outlet (). The first air inlet () is adapted to admit air into the first compressor (), and the first air outlet () is fluidly connected to the intake manifold (). The first turbine () fluidly communicates with a tailpipe (). A second compressor () is operably associated with a second turbine () and has a first tributary fluid inlet (), a second tributary fluid inlet (), and a second fluid outlet (). The first tributary fluid inlet () is fluidly connected to the tailpipe () at a junction (), the second tributary fluid inlet () is adapted to admit air into the second compressor (), and the second fluid outlet () is fluidly connected to the intake manifold (). The second turbine () is fluidly connected to the tailpipe ().

Internal combustion engine having compressor with first and second tributary inlets

In an internal combustion engine, a fixed engine valve timing profile may be combined with a variable profile produced by a valve actuator coupled to one or more engine valves. By controlling one or more engine valves independent of the fixed timing profile, engine gas flow may be more flexibly regulated, thereby optimizing engine performance under a wide variety of operating conditions. In one embodiment, enhanced internal exhaust gas recirculation (EGR) may be achieved. A turbocharger may be used, along with the control provided by the valve actuator, to further control engine gas flow. In this manner, the present invention facilitates greater control of engine gas flow with minimal cost and complexity.

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Lake Zurich, IL, United States of America

Qianfan Xin