Caterpillar Inc.

Brian R Weller

Stephan Donald Roozenboom

Jack Albert Merchant

Phillip J Houtz

Allyn P Bock

Edward H Betts, Jr

Gregg W Uhland

Shawn J Weck

Stephen V Kelly

Clark C Schweigert

Samuel L McLaughlin

Steven C Swanson

William A Calliss

Robert L Pribble

Matthew D Moran

Naseer A Niaz

Scott A Simpson

Barry Medd

An apparatus for an internal combustion engine controls engine timing as a function of engine load, speed and air intake temperature to reduce engine NOx emissions and/or engine fuel consumption. The apparatus is particularly beneficial to a large, aftercooled turbocharged engine which utilizes a cooling system having a liquid cooled, separate circuit aftercooler (SCAC) to cool the pressurized intake air. By routing the aftercooler circuit and engine coolant circuit through a common or single core radiator, the aftercooler cooling circuit temperature and associated engine air intake temperature are reduced to further reduce engine NOx emissions and/or engine fuel consumption.

Apparatus for controlling fuel delivery of an engine

This invention relates to a cooling system for a turbocharger engine having a first and a second fluid passing cooling circuits connected to a common radiator at spaced apart locations on the radiator. The first fluid passing cooling circuit circulates cooling fluid flow between the radiator and the engine and the second fluid passing cooling circuit circulates cooling fluid between an aftercooler and the engine. A temperature controlled valve in the first fluid passing circuit increases the cooling capacity of the second fluid passing circuit when closed or partially closed.

Dual circuit cooling systems

A method for an internal combustion engine controls engine timing as a function of engine load, speed and air intake temperature to reduce engine NOx emissions and/or engine fuel consumption. The method is particularly beneficial to a large, aftercooled turbocharged engine which utilizes a cooling system having a liquid cooled, separate circuit aftercooler (SCAC) to cool the pressurized intake air. By routing the aftercooler circuit and engine coolant circuit through a common or single core radiator, the aftercooler cooling circuit temperature and associated engine air intake temperature are reduced to further reduce engine NOx emissions and/or engine fuel consumption.

Method for controlling engine timing

The design and construction of past articulated pistons include an open space between a head portion and an independent skirt portion. The open space allows excess cooling fluid, such as oil, to exit the piston and flow toward the cylinder, increasing oil consumption and carbon deposits within the engine. The present invention overcomes these problems by positioning a sealing means within an open space between a head portion and a skirt portion of an articulated piston. The sealing means completely blocks the oil from exiting the piston while being adequately conformable to allow the necessary articulation between the head and skirt portions.

Sealed articulated piston

An engine control system is provided which calculates an optimum air/fuel ratio by minimizing the smoke produced by the engine while at the same time maximizing the engine response time for all altitudes over which the engine operates. The control system includes a microprocessor, an ambient pressure sensor, fuel injectors, and storage means. A manual adjustment is provided that allows an operator to manually adjust the air/fuel ratio within certain pre-defined limits of the optimum value.

Apparatus and method for controlling engine response versus exhaust smoke

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Lafayette, IN, United States of America

Brian R Weller