Caterpillar Inc.

Shashank Mupparapu

Stephan Donald Roozenboom

Jinhui Sun

Yung T Bui

Paul Park

Michael P Boahene

Tetsu O Velasquez

Craig Phillip Hittle

Theodore J Tarabulski

Raymond Upano Isada

Raymond Bassilli Gerges

Michael R Errera

Sairam Thiagarajan

Rick E Jeffs

Bryce L Tiller

A composite catalyst substrate is provided, which may include a metallic core and a porous ceramic coating on the metallic core. The substrate may also include a washcoat substantially covering the ceramic coating and including a catalyst material configured to react with constituents in an exhaust flow of an exhaust producing engine. The catalyst material may be dispersed in, or coated on, the washcoat.

Composite catalyst substrate

An exhaust aftertreatment system including a housing with two or more inlets configured to receive separate entering exhaust streams from an engine. The system may include two or more first exhaust treatment devices, each configured to receive one of the separate entering exhaust streams in a first direction. The system may further include two or more redirecting flow passages configured to combine the separate exhaust streams into a merged exhaust stream that flows in a second direction about 180 degrees from the first direction and an intermediate flow region configured to divide the merged exhaust stream into two or more separate exiting exhaust streams. The system also may also includes two or more second exhaust treatment devices, each configured to receive one of the separate exiting exhaust streams in a third direction about 90 degrees from the second direction.

Exhaust aftertreatment system

An exhaust aftertreatment system including an exhaust flow area, a first bank of one or more exhaust treatment devices in fluid communication with the exhaust flow area and a second bank of one or more exhaust treatment devices in fluid communication with the exhaust flow area. The first bank may be arranged in parallel with the second bank and inlet of the first bank is configured to provide greater flow resistance to the exhaust than the inlet of the second bank.

A method for purging reductant from a reductant supply system is disclosed. The method includes dispensing reductant into an exhaust system via a dispensing device. The method also includes purging the dispensing device by urging reductant from the dispensing device to a reductant source.

Method for purging a dosing system

A reductant dosing manifold is disclosed. The reductant dosing manifold may have a housing with a pump interface configured to directly connect the reductant dosing manifold to a reductant pump, and a reductant supply passage in fluid communication with the pump interface. The housing may also have a reductant outlet port, and a pressurized reductant passage connecting the pump interface to the reductant outlet port.

Reductant dosing manifold

A reductant dosing system for a machine having an engine and an exhaust system is disclosed. The reductant dosing system has a tank configured to hold a reductant, a dosing arrangement, and a supply passage connecting the tank to the dosing arrangement. The reductant dosing system also has a purging arrangement configured to direct purge fluid to at least one of the dosing arrangement and the supply passage, and a valve configured to allow reductant to pass from the tank to the supply passage and to inhibit purge fluid from entering the tank.

Growing community of inventors

Peoria, IL, United States of America

Shashank Mupparapu