Cummins Emission Solutions Inc.

Cummins Inc.

Stephanie L Apewokin

Andrew Morgan Myer

George L Muntean

John K Heichelbech

Samuel Johnson

John Anthis

Srivardhan Chandrapati

Joshua D Henry

Aalok Trivedi

Omkar Tendolkar

Stephen M Holl

Jim F Burke

James F Burke

Steve Holl

Chetan Ponnathpur

Yongquan Chai

Melissa A Zaczek

Eric Burmeister

Nate Garrett

Nachiket Pawar

Kundana Inala

Cynthia Gosselin

Urea solution pumps having leakage bypass flowpaths and methods of operating the same are disclosed. Certain embodiments are pump apparatuses including an inlet passage in flow communication with a source of urea solution and a pump chamber, an outlet passage in flow communication with the pump chamber and an exhaust after treatment system, a diaphragm facing the pump chamber and coupled with an actuator, a first housing member coupled with a second housing member form a seal around the pumping chamber, a leak collection chamber surrounding the seal, and a return passage in flow communication with the leak collection chamber and the inlet passage. Urea solution that leaks from the pump chamber past the seal is received by the leak collection chamber and flows through the return passage to the pump inlet passage.

Urea solution pumps having leakage bypass

A system is provided for delivery of diesel exhaust fluid or other reductant to an injector for release into an engine exhaust aftertreatment system. The injector includes a nozzle assembly that thermally shields the diesel exhaust fluid from the exhaust gas temperatures. A diesel exhaust fluid delivery procedure is also disclosed for nozzle cooling prior to operation of the injector for emissions reduction.

Systems and techniques for nozzle cooling of diesel exhaust fluid injection systems

A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a heat exchange circuit that provides a flow path from the heat source to the doser, from the doser to the reductant storage tank, and from the reductant storage tank to the heat source. A control valve controls the flow of the heat exchange fluid in the heat exchange circuit so that at least one heat exchange cycle includes a circulation period that increases the temperature of the reductant in the doser and storage tank and a termination period where circulation is stopped until reductant temperature in the doser reaches a lower limit.

Systems and techniques for heating urea injection systems

A system includes a cylindrical blend chamber having two inlets and one outlet. The outlet is fluidly coupled to a transfer line, and a nozzle is positioned downstream of the transfer line. The nozzle is fluidly coupled to an exhaust stream of an internal combustion engine. The system further includes a first inlet fluidly coupled to a diesel exhaust fluid (DEF) stream, and a second inlet fluidly coupled to an air stream. The DEF stream and the air stream intersect at a divergent angle.

System, method, and apparatus for delivering highly atomized diesel exhaust fluid to an exhaust aftertreatment system

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St. Anthony, MN, United States of America

Stephanie L Apewokin