Patents by Inventor Varun RAMESH
Varun RAMESH 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: 11927126Abstract: The present disclosure describes methods for evaluating quality of DEF dosed to an EAS including a close coupled SCR unit a downstream SCR unit. A NOx conversion efficiency of the close coupled SCR unit and a NOx conversion efficiency of the downstream SCR unit are used to evaluate quality of DEF. In some embodiments, the NOx conversion efficiency of close coupled SCR unit is used to evaluate quality of DEF. Operation of an EAS using the results of the evaluation of quality of DEF are described.Type: GrantFiled: October 13, 2022Date of Patent: March 12, 2024Assignee: PACCAR INCInventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
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Publication number: 20240060439Abstract: A heavy duty truck includes a diesel engine that generates an exhaust gas flow and an exhaust after-treatment system for treatment of the exhaust gas flow. The exhaust after-treatment system includes at least one heater and at least one selective catalytic reduction system downstream of the heater. The heater is operated to inject supplemental heat energy into the exhaust gas flow at a rate based on a difference between a target rate of heat energy in the exhaust gas flow at an inlet to the selective catalytic reduction system and a rate of heat energy supplied to the exhaust gas flow from the diesel engine.Type: ApplicationFiled: June 28, 2023Publication date: February 22, 2024Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
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Patent number: 11879367Abstract: A heavy-duty truck has a diesel engine, an exhaust after-treatment system, and an engine control unit. The exhaust after-treatment system includes a close-coupled selective catalytic reduction system and an underbody selective catalytic reduction system, a first NOx sensor upstream of the close-coupled selective catalytic reduction system, a second NOx sensor between the two selective catalytic reduction systems, and a third NOx sensor downstream of the underbody selective catalytic reduction system. The engine control unit may perform methods allowing intrusive diagnostics to be performed on exhaust gas NOx sensors using the selective catalytic reduction systems during normal operation of the heavy-duty truck.Type: GrantFiled: August 25, 2020Date of Patent: January 23, 2024Assignee: PACCAR IncInventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh
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Patent number: 11828677Abstract: Aspects of systems, method, and computer-readable storage media are described herein that are configured to provide operator fleet performance benchmarking and analytics. A fleet analytics system may include user-friendly front end client application with which a non-technical user may interface, and a back end analytics and visualization system that is deployed on the cloud and offered as a service to determine a subset of ‘like operators’ to utilize as a baseline in a benchmark analysis, to benchmark a target operator's performance against the subset of like operators, determine analytics resulting from the benchmark analysis, and to generate visualizations of the analytics for display to the user/operator.Type: GrantFiled: April 23, 2021Date of Patent: November 28, 2023Assignee: PACCAR Inc.Inventors: Varun Ramesh, Carl Hergart, Cynthia Chaffin Webb, Jorge Rafael Lozada Ramirez
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Patent number: 11725560Abstract: A heavy duty truck includes a diesel engine that generates an exhaust gas flow and an exhaust after-treatment system for treatment of the exhaust gas flow. The exhaust after-treatment system includes at least one heater and at least one selective catalytic reduction system downstream of the heater. The heater is operated to inject supplemental heat energy into the exhaust gas flow at a rate based on a difference between a target rate of heat energy in the exhaust gas flow at an inlet to the selective catalytic reduction system and a rate of heat energy supplied to the exhaust gas flow from the diesel engine.Type: GrantFiled: August 25, 2020Date of Patent: August 15, 2023Assignee: PACCAR INCInventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
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Patent number: 11661880Abstract: A method of manufacturing an on-board diagnostic (OBD) limit part and a method of testing to evaluate an OBD system. The method of manufacturing the OBD limit part includes introducing a contaminant to a selective catalytic reduction (SCR) catalyst and contacting the contaminant with the SCR catalyst for a selected period of time. The method of manufacturing utilizes a vessel, the contaminant, and the SCR catalyst. The OBD limit part is a combination of the contaminant and the SCR catalyst within the vessel. The method of testing to evaluate the OBD system includes collecting data related to an exhaust gas before and after the exhaust gas is exposed to the OBD limit part, collecting an indication provided by the OBD system, and comparing the data related to the exhaust gas and the indication provided by the OBD system. The method of testing to evaluate the OBD system utilizes a system that includes an exhaust gas source, a first and a second fluid path, the OBD limit part, and the OBD system.Type: GrantFiled: October 28, 2021Date of Patent: May 30, 2023Assignee: PACCAR IncInventors: Varun Ramesh, Isaac Stark
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Patent number: 11608766Abstract: The present disclosure describes methods for evaluating ammonia storage capacity of a close-coupled SCR unit while remaining compliant with prescribed emissions limits, methods of controlling an emission aftertreatment system including multiple SCR units and emission management systems for a vehicle including an internal combustion engine and an emission aftertreatment system that includes two or more SCR units.Type: GrantFiled: April 6, 2022Date of Patent: March 21, 2023Assignee: PACCAR INCInventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
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Publication number: 20230066134Abstract: An insulating glass pane arrangement includes at least one first pane having a first surface and a second surface, wherein the first pane is designed as an inner pane, at least one second pane having a first surface and a second surface, wherein the second pane is designed as an outer pane, at least one first cavity that is arranged between the first pane and the second pane, at least one component arranged in the first cavity including a data memory, a read-out device with an active transmitting device, and an energy harvesting element, wherein the read-out device and the energy harvesting element are designed for read-out and energy harvesting through the first pane.Type: ApplicationFiled: January 21, 2021Publication date: March 2, 2023Inventors: Christian EFFERTZ, Shelby Doane CRAIG, Varun RAMESH KUMAR
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Publication number: 20230034184Abstract: The present disclosure describes methods for evaluating quality of DEF dosed to an EAS including a close coupled SCR unit a downstream SCR unit. A NOx conversion efficiency of the close coupled SCR unit and a NOx conversion efficiency of the downstream SCR unit are used to evaluate quality of DEF. In some embodiments, the NOx conversion efficiency of close coupled SCR unit is used to evaluate quality of DEF. Operation of an EAS using the results of the evaluation of quality of DEF are described.Type: ApplicationFiled: October 13, 2022Publication date: February 2, 2023Inventors: Charles Wayne Reinhardt SWART, Cynthia Chaffin WEBB, Maarten MEIJER, Varun RAMESH
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Publication number: 20220416399Abstract: A vehicle pane has a first substrate and at least one first electrically conducting layer, wherein an antenna structure is formed in the electrically conducting layer, wherein the antenna structure provides a Vivaldi-antenna-like structure, wherein the antenna structure has two substantially identical antenna elements, wherein the two antenna elements are arranged at an angle relative to one another, wherein the angle is greater than 0° and less than 180° such that the antenna elements appear substantially as mirror images at the angle bisector.Type: ApplicationFiled: December 2, 2020Publication date: December 29, 2022Inventors: Adrien GUTH, Guillaume FRANCOIS, Guillaume PETITDIDIER, Varun RAMESH KUMAR
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Patent number: 11499463Abstract: The present disclosure describes methods for evaluating quality of DEF dosed to an EAS including a close coupled SCR unit a downstream SCR unit. A NOx conversion efficiency of the close coupled SCR unit and a NOx conversion efficiency of the downstream SCR unit are used to evaluate quality of DEF. In some embodiments, the NOx conversion efficiency of close coupled SCR unit is used to evaluate quality of DEF. Operation of an EAS using the results of the evaluation of quality of DEF are described.Type: GrantFiled: August 25, 2020Date of Patent: November 15, 2022Assignee: PACCAR INCInventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
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Patent number: 11473470Abstract: The present disclosure describes methods for operating an EAS including a close coupled SCR unit, a downstream SCR unit, a diesel oxidation catalyst unit (DOC) and a diesel particulate filter (DPF). The methods utilize the close coupled SCR unit to manage NOx emissions from the EAS during regeneration of a diesel particulate filter (DPF).Type: GrantFiled: October 21, 2021Date of Patent: October 18, 2022Assignee: PACCAR INCInventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh
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Publication number: 20220316376Abstract: The present disclosure describes methods for evaluating ammonia storage capacity of a close-coupled SCR unit while remaining compliant with prescribed emissions limits, methods of controlling an emission aftertreatment system including multiple SCR units and emission management systems for a vehicle including an internal combustion engine and an emission aftertreatment system that includes two or more SCR units.Type: ApplicationFiled: April 6, 2022Publication date: October 6, 2022Inventors: Charles Wayne Reinhardt SWART, Cynthia Chaffin WEBB, Maarten MEIJER, Varun RAMESH
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Patent number: 11428136Abstract: A heavy duty truck includes a diesel engine, an exhaust after-treatment system, and an engine control unit. The exhaust after-treatment system may include one or more selective catalytic reduction systems, each with a respective heater, and each heater with a respective pair of temperature sensors, one upstream and the other downstream of the heater. Such systems may be used to perform diagnostic methods including populating a lookup table having heat energy supplied to an exhaust gas stream by the diesel engine as a first independent variable, heat energy supplied to the exhaust gas stream by a heater as a second independent variable, and a resulting temperature as an output. Such a lookup table can be used to maintain a temperature of the exhaust gas flow at a constant target temperature.Type: GrantFiled: August 25, 2020Date of Patent: August 30, 2022Assignee: PACCAR INCInventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
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Publication number: 20220231405Abstract: A vehicle pane includes a first substrate, at least one antenna structure and a connection region, wherein the antenna structure is arranged on a flexible film, wherein, additionally, a first line region is provided on the flexible film, wherein the connection region is arranged on a carrier, wherein, additionally, a second line region is provided on the carrier, wherein the flexible film has a first contact region and the carrier has a second contact region for the reciprocal connection of the first line region to the second line region, wherein the flexible film is routed around one end of the first substrate.Type: ApplicationFiled: April 23, 2020Publication date: July 21, 2022Inventors: Varun RAMESH KUMAR, Guillaume FRANCOIS, Thomas HOLTSTIEGE
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Patent number: 11326493Abstract: The present disclosure describes methods for evaluating ammonia storage capacity of a close-coupled SCR unit while remaining compliant with prescribed emissions limits, methods of controlling an emission aftertreatment system including multiple SCR units and emission management systems for a vehicle including an internal combustion engine and an emission aftertreatment system that includes two or more SCR units.Type: GrantFiled: August 25, 2020Date of Patent: May 10, 2022Assignee: PACCAR INCInventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
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Publication number: 20220049639Abstract: A method of manufacturing an on-board diagnostic (OBD) limit part and a method of testing to evaluate an OBD system. The method of manufacturing the OBD limit part includes introducing a contaminant to a selective catalytic reduction (SCR) catalyst and contacting the contaminant with the SCR catalyst for a selected period of time. The method of manufacturing utilizes a vessel, the contaminant, and the SCR catalyst. The OBD limit part is a combination of the contaminant and the SCR catalyst within the vessel. The method of testing to evaluate the OBD system includes collecting data related to an exhaust gas before and after the exhaust gas is exposed to the OBD limit part, collecting an indication provided by the OBD system, and comparing the data related to the exhaust gas and the indication provided by the OBD system. The method of testing to evaluate the OBD system utilizes a system that includes an exhaust gas source, a first and a second fluid path, the OBD limit part, and the OBD system.Type: ApplicationFiled: October 28, 2021Publication date: February 17, 2022Inventors: Varun RAMESH, Isaac STARK
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Publication number: 20220042439Abstract: The present disclosure describes methods for operating an EAS including a close coupled SCR unit, a downstream SCR unit, a diesel oxidation catalyst unit (DOC) and a diesel particulate filter (DPF). The methods utilize the close coupled SCR unit to manage NOx emissions from the EAS during regeneration of a diesel particulate filter (DPF).Type: ApplicationFiled: October 21, 2021Publication date: February 10, 2022Inventors: Cynthia Chaffin WEBB, Charles Wayne Reinhardt SWART, Maarten MEIJER, Varun RAMESH
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Publication number: 20220025800Abstract: The present disclosure describes methods for evaluating quality of DEF dosed to an EAS including a close coupled SCR unit a downstream SCR unit. A NOx conversion efficiency of the close coupled SCR unit and a NOx conversion efficiency of the downstream SCR unit are used to evaluate quality of DEF. In some embodiments, the NOx conversion efficiency of close coupled SCR unit is used to evaluate quality of DEF. Operation of an EAS using the results of the evaluation of quality of DEF are described.Type: ApplicationFiled: August 25, 2020Publication date: January 27, 2022Inventors: Charles Wayne Reinhardt SWART, Cynthia Chaffin WEBB, Maarten MEIJER, Varun RAMESH
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Publication number: 20220025798Abstract: The present disclosure describes methods for evaluating NOx conversion efficiency of a close coupled SCR unit of an EAS including the close coupled SCR unit and a downstream SCR unit. The determined NOx conversion efficiency of the close coupled SCR unit is used to diagnose the close coupled SCR unit and or EAS and to control operation parameters of the EAS and/or internal combustion engine operably connected to the EAS.Type: ApplicationFiled: August 25, 2020Publication date: January 27, 2022Inventors: Charles Wayne Reinhardt SWART, Cynthia Chaffin WEBB, Maarten MEIJER, Varun RAMESH