Caterpillar Inc.

Caterpiller Inc.

Tyler V Richards

Jason Kenneth Bloms

Joshua Lynn Ratts

Glenn Brian Cox

Matthew Colin Mowers

David Kapparos

Sowmya Nagesh

Hrishi Lalit Shah

Vadiraj Prakash Kulkarni

Rajiv Nanjundareddy

Matt Leustek

An aftertreatment system for a diesel engine may include a diesel particulate filter configured for placement in fluid communication with the diesel engine to receive an exhaust flow. The system may also include a selective catalytic reduction system configured for arrangement downstream of the diesel particulate filter and a NOsensor configured to measure a NOconcentration in the exhaust flow entering the selective catalytic reduction system. The system may also include a controller configured to estimate a ratio of NOto NOdownstream of the diesel particulate filter and based on a factor affecting the generation of NOupstream of the selective catalytic reduction system. The controller may also be configured to adjust the measured NOconcentration based on the ratio to provide an estimated actual NOconcentration and dose diesel exhaust fuel into the exhaust flow based on the estimated actual NOconcentration.

Aftertreatment system

Systems, methods, assemblies, and components for aftertreatment of an engine can comprise an aftertreatment module including an exhaust enclosure with at least one inlet port to receive exhaust gas, an outlet port to output exhaust gas, a first compartment, and a second compartment; a plurality of particulate filters extending in parallel with each other within the exhaust enclosure such that, for each of the particulate filters, an inlet of the particulate filter is in the first compartment and an outlet of the particulate filter is in the second compartment; and at least one radio frequency (RF) sensor set including an RF transmitter assembly and an RF receiver assembly. The RF transmitter assembly can be provided in the first compartment at the inlet of one of the particulate filters, and the RF receiver assembly can be provided at the outlet of said one particulate filter.

Engine multi-path aftertreatment system with radio frequency sensors and methods, assemblies, and components thereof

An after-treatment device that includes a diesel particulate filter (DPF) requiring periodic regeneration includes a sensor providing a signal indicative of a soot accumulation and at least one device providing an operating parameter indicative of a work mode of the machine. A controller determines a soot level and a readiness level based on the work mode of the machine, and further classifies the soot level relative to a desired range for initiating a regeneration event and initiates the regeneration event when the soot level falls within the desired range.

Diesel particulate filter regeneration control and method

An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passage, a particulate filter located within the exhaust passage, and a heating device located to selectively heat matter collected within the particulate filter. The exhaust system may also have a controller configured to determine an amount of matter collected within the particulate filter exceeding a threshold amount, and to activate the heating device in a first operating mode to regenerate the particulate filter based on the amount of collected matter. The controller may be further configured to detect a temperature constraining condition of the combustion engine, to determine an amount of oxygen within the flow of exhaust during the temperature constraining condition, and to activate the heating device in a second operating mode to constrain a regeneration temperature of the particulate filter based on the amount of oxygen within the flow of exhaust.

Exhaust system implementing temperature-constraining regeneration strategy

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Peoria, IL, United States of America

Tyler V Richards