Caterpillar Inc.

Ryan Kominkiewicz

Yong Yi

James Harris Mutti

Anna Johnson

Brock Davis

Brandon Neuhoff

A mixer assembly for mixing, in a mixing tube of an exhaust aftertreatment system, a reductant with an exhaust gas from an internal combustion engine may include a mixer and an electrically heated heating element. The mixer may be positioned in proximity to the reductant injector. The electrically heated heating element may be positioned in proximity to an impingement surface of the mixer. The reductant may directly impinge, after being injected, on the impingement surface causing the reductant to vaporize and mix with the exhaust gas forming a vaporized reductant and exhaust gas mixtures that flows along a flow path defined by the mixing tube. The vaporized reductant and exhaust gas mixture may be heated and further mixed by the electrically heated heating element.

Electrically heated mixer assembly for an exhaust aftertreatment system

An engine exhaust aftertreatment system is disclosed. The system may comprise: an internal combustion engine having an intake passage and an exhaust passage; a turbocharger fluidly connected to the internal combustion engine, the turbocharger including a compressor and a turbine, the compressor being in fluid communication with the intake passage, and the turbine being in fluid communication with the exhaust passage; a reductant injector situated downstream of the turbocharger, wherein the reductant injector is closely coupled to the turbocharger such that a reductant is injected into an exhaust flow of the turbocharger; a first container downstream of the reductant injector, the first container including a multi-functional catalyst (MFC); and a second container downstream of the first container, the second container including a selective catalytic reduction (SCR) component and an Ammonia catalyst (AMOx) component.

Engine aftertreatment system

A regeneration control system for an oxidation catalyst in an internal combustion engine includes a temperature sensor to produce a temperature signal indicative of an exhaust inlet temperature that is below a regeneration temperature for accumulated hydrocarbons on the oxidation catalyst, an electrically actuated boost leakage valve, and a regeneration control unit. The regeneration control unit commands an adjustment to the position of the electrically actuated boost leakage valve to increase leaked boost to increase exhaust temperature to the regeneration temperature by way of increased air-fuel ratio. Related methodology is disclosed.

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Morton, IL, United States of America

Ryan Kominkiewicz