Patents by Inventor Joshua L Ratts
Joshua L Ratts has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11725555Abstract: 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 NOx sensor configured to measure a NOx concentration in the exhaust flow entering the selective catalytic reduction system. The system may also include a controller configured to estimate a ratio of NO2 to NOx downstream of the diesel particulate filter and based on a factor affecting the generation of NO2 upstream of the selective catalytic reduction system. The controller may also be configured to adjust the measured NOx concentration based on the ratio to provide an estimated actual NOx concentration and dose diesel exhaust fuel into the exhaust flow based on the estimated actual NOx concentration.Type: GrantFiled: February 7, 2022Date of Patent: August 15, 2023Assignee: Caterpillar Inc.Inventors: Joshua L. Ratts, Hrishi Lalit Shah, Tyler V. Richards, Matthew Colin Mowers, Sowmya Nagesh
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Publication number: 20230250744Abstract: 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 NOx sensor configured to measure a NOx concentration in the exhaust flow entering the selective catalytic reduction system. The system may also include a controller configured to estimate a ratio of NO2 to NOx downstream of the diesel particulate filter and based on a factor affecting the generation of NO2 upstream of the selective catalytic reduction system. The controller may also be configured to adjust the measured NOx concentration based on the ratio to provide an estimated actual NOx concentration and dose diesel exhaust fuel into the exhaust flow based on the estimated actual NOx concentration.Type: ApplicationFiled: February 7, 2022Publication date: August 10, 2023Applicant: Caterpillar Inc.Inventors: Joshua L. Ratts, Hrishi Lalit Shah, Tyler V. Richards, Matthew Colin Mowers, Sowmya Nagesh
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Patent number: 11566554Abstract: 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.Type: GrantFiled: March 12, 2021Date of Patent: January 31, 2023Assignee: Caterpillar Inc.Inventors: Joshua L. Ratts, Tyler V. Richards
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Patent number: 11549418Abstract: A computer-implemented system for monitoring the performance of an aftertreatment component in an exhaust system of a power generation system utilizes a remaining useful life (RUL) algorithm to predict its remaining operational life until it must be regenerated by a desulfation process. The RUL algorithm can utilize values such as a current sulfur accumulation value representing the quantity of sulfur currently accumulated in the aftertreatment component, a sulfur accumulation threshold representing the quantity sulfur the aftertreatment component can operationally retain, and an instantaneous sulfur accumulation rate of change representing the current rate at which the aftertreatment component retains sulfur.Type: GrantFiled: December 20, 2021Date of Patent: January 10, 2023Assignee: Caterpillar Inc.Inventors: Joshua L. Ratts, Julia H. Jenks
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Publication number: 20220290602Abstract: 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.Type: ApplicationFiled: March 12, 2021Publication date: September 15, 2022Applicant: Caterpillar Inc.Inventors: Joshua L. RATTS, Tyler V. RICHARDS
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Patent number: 10989654Abstract: An aftertreatment system for an engine system is disclosed. The aftertreatment system may comprise an optical sensor mounted on the aftertreatment catalyst. The optical sensor may include a light source configured to illuminate the aftertreatment catalyst with light and a detector configured to measure an amount of the light absorbed by the aftertreatment catalyst upon illumination with the light. The measured amount of the light absorbed by the aftertreament catalyst may correlate with a condition parameter (e.g., hydrocarbon loading, oxidation state, etc.) of the aftertreatment catalyst.Type: GrantFiled: April 8, 2019Date of Patent: April 27, 2021Assignee: Caterpillar Inc.Inventors: Joshua L. Ratts, Wilce Damion Williams
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Publication number: 20200319094Abstract: An aftertreatment system for an engine system is disclosed. The aftertreatment system may comprise an optical sensor mounted on the aftertreatment catalyst. The optical sensor may include a light source configured to illuminate the aftertreatment catalyst with light and a detector configured to measure an amount of the light absorbed by the aftertreatment catalyst upon illumination with the light. The measured amount of the light absorbed by the aftertreament catalyst may correlate with a condition parameter (e.g., hydrocarbon loading, oxidation state, etc.) of the aftertreatment catalyst.Type: ApplicationFiled: April 8, 2019Publication date: October 8, 2020Applicant: Caterpillar Inc.Inventors: Joshua L. Ratts, Wilce Damion Williams
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Patent number: 8992869Abstract: A treatment device configured to receive a flow of exhaust from a power source is disclosed. The treatment device may have a first layer, a second layer, and a substrate layer. The first layer may include a selective catalytic reduction layer, and the second layer may be disposed downstream of the first layer and include an oxidation catalyst support. The substrate layer may be disposed adjacent to the second layer. Additionally, an additive may be disposed downstream of the first layer. The additive may be operative to substantially prohibit migration of a component of the second layer to the first layer upon treatment of the flow of exhaust by the oxidation catalyst support.Type: GrantFiled: December 20, 2012Date of Patent: March 31, 2015Assignee: Caterpillar Inc.Inventors: Joshua L Ratts, Ronald Graham Silver
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Publication number: 20140178273Abstract: A treatment device configured to receive a flow of exhaust from a power source is disclosed. The treatment device may have a first layer, a second layer, and a substrate layer. The first layer may include a selective catalytic reduction layer, and the second layer may be disposed downstream of the first layer and include an oxidation catalyst support. The substrate layer may be disposed adjacent to the second layer. Additionally, an additive may be disposed downstream of the first layer. The additive may be operative to substantially prohibit migration of a component of the second layer to the first layer upon treatment of the flow of exhaust by the oxidation catalyst support.Type: ApplicationFiled: December 20, 2012Publication date: June 26, 2014Applicant: Caterpillar Inc.Inventors: Joshua L Ratts, Ronald Graham Silver