Caterpillar Inc.

William Christopher Boley

Gary N Boyer

Stuart Niese

Brett M Bailey

Darryl Dean Baldwin

Geoffrey D Ginzel

Joel D Hiltner

Sean R Strubhar

Ryan E Meister

Brady L Winkleman

A natural gas compression system is provided. The system may include a natural gas compressor configured to compress, and thereby pump, natural gas through a pipeline. The system may also include a natural gas burning engine, operatively coupled to the gas compressor, the engine being supplied with air by an induction system. The induction system may include a supercharger driven by the engine and configured to compress intake air and a turbocharger downstream from the supercharger and driven by exhaust gases produced by the engine. The induction system may also include a supercharger compressor bypass configured to selectively recirculate a portion of the compressed output of the supercharger upstream of the supercharger.

Natural gas compression system

An air induction system for a power system is provided having a compressor operable to compress air directed into an engine. In addition, the air induction system has a throttle valve disposed between the compressor and the engine, the throttle valve being configured to selectively restrict the flow of compressed air into the engine. The air induction system also has a recirculation valve disposed between the compressor and the throttle valve, the recirculation valve being configured to selectively divert a portion of the flow of compressed air. Furthermore, the air induction system has a controller configured to actuate the recirculation valve in response to a pressure differential between air upstream of the throttle valve and air downstream of the throttle valve.

Air induction system with recirculation loop

A spark ignited gaseous fuel engine including an exhaust gas recirculation system and method for operating a gaseous fuel engine are provided. The exhaust gas recirculation system has an adjustable flow and is operable to supply exhaust gas to at least one engine cylinder. The engine further includes means for determining a value indicative of a charge density of a combustion mixture that includes gaseous fuel, air and exhaust gas supplied to the at least one cylinder, and adjusting a flow quantity through the exhaust gas recirculation system based at least in part on the value. The charge density may permit the controller to set a NOoutput rate from the engine via a pre-determined correlation between charge density and NOx output.

Gaseous fuel engine charge density control system

Apparatuses and methods for determining a desired charge density for an engine. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first and second characteristics.

Charge density control for an internal combustion engine

An engine emissions control system is provided. The system may include an exhaust producing engine and an exhaust system through which the exhaust produced by the engine may flow. The system may also include a NOsensor configured to take a NOmeasurement of the amount of NOin the exhaust produced by the engine. The system may further include a charge density sensing system configured to measure the charge density of a combustion mixture of the engine. In addition, the system may include a controller configured to receive information related to the measurement of the amount of NO. The controller may be further configured to control a charge density of the combustion mixture with which the engine operates based on the NOmeasurement and the charge density measured by the charge density sensing system.

Engine emissions control system

A method of controlling a compressor includes measuring a pressure of fluid entering the compressor, measuring a pressure of fluid exiting the compressor, and measuring a rotational speed of the compressor. Signals indicative of the measured pressure of fluid entering the compressor, measured pressure of fluid exiting the compressor, and measured rotational speed of the compressor are sent to an electronic control unit. The operation of the compressor is controlled in response to at least the signal indicative of the measured rotational speed of the compressor received by the electronic control unit.

Engine turbocharger control management system

Apparatus and methods for determining a desired charge density for an engine having an inlet air pathway. A first characteristic indicative of an engine speed of the engine is determined. A second characteristic indicative of a load on the engine is determined. A third characteristic indicative of a humidity of air in the inlet air pathway. A value indicative of a desired charge density of a combustion mixture for the engine is determined as a function of the first, second, and third characteristics.

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Lafayette, IN, United States of America

William Christopher Boley