Caterpillar Inc.

Donald W Heston

Brian Douglas Hoff

Eric Charles Fluga

James John Callas

Richard W Kruiswyk

Ronald L Dupree

David L Lehman

Daniel W Crosby

Robert L Hercey

A method of operating an internal combustion engine system includes passing exhaust gases from an engine to an aftertreatment device such as a particulate filter at an exhaust temperature less than a target temperature, and increasing a temperature of exhaust gases passing through the aftertreatment device to the target temperature by controllably restricting exhaust flow upstream the filter. The method still further includes generating a signal indicative of exhaust back pressure and reducing exhaust pressure by selectively reducing airflow to the engine responsive to the signal. An internal combustion engine system and associated control system includes an electronic control unit configured to selectively increase a temperature of exhaust gases passing through a particulate filter to a regeneration temperature via a variable flow restriction device. The electronic control unit is further configured to reduce exhaust pressure upstream the flow restriction device by commanding adjusting an intake airflow control element for the engine responsive to a signal corresponding to exhaust back pressure.

Engine system, operating method and control strategy for aftertreatment thermal management

Engines having turbochargers with a mechanically actuated wastegate typically control the wastegate in response to the air pressure at an outlet of a compressor portion of the turbocharger. Some engine configurations don't provide enough compressor outlet pressure variation to suitably control the wastegate. In the present invention, a control strategy is provided for opening and closing a wastegate based on exhaust gas pressure.

Method and apparatus to control a turbocharger wastegate using exhaust pressure

A cooling system has an air-to-air or first heat exchanger and a fluid or second heat exchanger mounted remotely from a main radiator for cooling an internal combustion engine. A filter filters a recipient fluid, such as an ambient air, before the recipient fluid passes through the first heat exchanger and the second heat exchanger. A cooled fluid is conducted to a flow of intake air for the internal combustion engine. A fan causes the recipient fluid to pass through the filter and the first heat exchanger and the second heat exchanger. The spent recipient fluid is discharged to atmosphere.

Combined remote first intake air aftercooler and a second fluid from an engine cooler for an engine

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Chillicothe, IL, United States of America

Donald W Heston