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公开(公告)号：US11428136B2
公开(公告)日：2022-08-30
申请号：US17002534
申请日：2020-08-25
Applicant: PACCAR Inc
Inventor： Charles Wayne Reinhardt Swart , Cynthia Chaffin Webb , Maarten Meijer , Varun Ramesh
Abstract: 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.
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公开(公告)号：US11181026B1
公开(公告)日：2021-11-23
申请号：US17002505
申请日：2020-08-25
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Charles Wayne Reinhardt Swart , Maarten Meijer , Varun Ramesh
Abstract: 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).
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公开(公告)号：US11808194B2
公开(公告)日：2023-11-07
申请号：US17720261
申请日：2022-04-13
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Charles Wayne Reinhardt Swart , Maarten Meijer , Phillip William Stephenson , Trevor Joseph Ott
CPC classification number: F01N3/208 , F01N3/106 , F01N3/2013 , F01N3/2033 , F01N3/0871 , F01N3/206 , F01N3/2066 , F01N9/005 , F01N11/005 , F01N2610/02 , F01N2610/10 , F01N2610/1453 , F01N2900/04 , F01N2900/1402 , F01N2900/1404 , F01N2900/1602 , F01N2900/18 , F01N2900/1811
Abstract: A modular exhaust subsystem for purifying an exhaust gas feedstream of a compression-ignition internal combustion engine upstream of a base exhaust aftertreatment system includes a selective catalytic reduction (SCR) catalyst, and a first exhaust gas sensor and a first temperature sensor that are arranged to monitor the SCR catalyst. A reductant delivery system is arranged to inject a reductant upstream of the SCR catalyst. A controller is in communication with an engine-out exhaust gas sensor, a second exhaust gas sensor and a second temperature sensor that are arranged to monitor the base exhaust aftertreatment system. The controller controls the reductant delivery system to inject the reductant into the exhaust gas feedstream upstream of the SCR catalyst based upon inputs from the first and second exhaust gas sensors, the engine-out exhaust gas sensor, and the first and second temperature sensors.
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公开(公告)号：US20220397073A1
公开(公告)日：2022-12-15
申请号：US17705570
申请日：2022-03-28
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Michael Douglas Gerty , Uday Vadlamani , Kimberly Denise McKinnon , Constantin Emil Nedelcu , Maarten Meijer , Charles Wayne Reinhardt Swart
Abstract: Methods of improving SCR performance in heavy duty vehicles may use multiple interdependent control techniques to increase engine exhaust temperatures in a fuel efficient manner. One method combines cylinder deactivation and mechanical loading of an engine by an electrical generator used to input energy into an exhaust stream to manipulate the exhaust temperature through the combined effect of modified air-to-fuel ratio and supplemental energy input. In particular, cylinder deactivation may be used to modify the engine air flowrate and the electric generator may be used to apply mechanical load on the engine to manipulate the engine fuel flow rate to control the engine air-to-fuel ratio and thereby increase exhaust temperatures. The exhaust temperatures may be further increased by using the electrical generator to add the energy generated as input energy to the exhaust stream.
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公开(公告)号：US11988163B2
公开(公告)日：2024-05-21
申请号：US17930892
申请日：2022-09-09
Applicant: PACCAR Inc
Inventor： Trevor Ott , Maarten Meijer , Stephen Ciatti , Brandon Rouse
CPC classification number: F02D41/0007 , F02B37/12 , F02B39/10 , F02D41/0087 , F02D41/1454 , F02D41/18 , F02B2037/122 , F02D2200/101
Abstract: Providing additional mass air flow to an engine of a vehicle to expand an operating range of cylinder deactivation (CDA) is provided. Aspects of the present disclosure describe a method and system to provide additional mass air flow to an engine using an auxiliary air source coupled to a turbocharger. When a low air-to-fuel ratio state is determined in association with operating the vehicle in CDA mode, the auxiliary air source is activated to assist the turbocharger with increase the supply of supercharged intake air to the engine. Accordingly, the operating range of CDA is expanded.
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Patent Agency Ranking
公开(公告)号：US11879367B2
公开(公告)日：2024-01-23
申请号：US17002570
申请日：2020-08-25
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Charles Wayne Reinhardt Swart , Maarten Meijer , Varun Ramesh
CPC classification number: F01N3/208 , F01N11/00 , F02D41/1441 , F02D41/1463 , F02D41/222 , F01N2390/02 , F01N2550/05 , F01N2560/026 , F01N2560/14 , F01N2590/08 , F01N2610/02 , F01N2610/1453 , F01N2900/1402
Abstract: 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.
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公开(公告)号：US11313301B2
公开(公告)日：2022-04-26
申请号：US16817201
申请日：2020-03-12
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Michael Douglas Gerty , Uday Vadlamani , Kimberly Denise McKinnon , Constantin Emil Nedelcu , Maarten Meijer , Charles Wayne Reinhardt Swart
Abstract: Methods of improving SCR performance in heavy duty vehicles may use multiple interdependent control techniques to increase engine exhaust temperatures in a fuel efficient manner. One method combines cylinder deactivation and mechanical loading of an engine by an electrical generator used to input energy into an exhaust stream to manipulate the exhaust temperature through the combined effect of modified air-to-fuel ratio and supplemental energy input. In particular, cylinder deactivation may be used to modify the engine air flowrate and the electric generator may be used to apply mechanical load on the engine to manipulate the engine fuel flow rate to control the engine air-to-fuel ratio and thereby increase exhaust temperatures. The exhaust temperatures may be further increased by using the electrical generator to add the energy generated as input energy to the exhaust stream.
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公开(公告)号：US20220025802A1
公开(公告)日：2022-01-27
申请号：US17002570
申请日：2020-08-25
Applicant: PACCAR Inc
Inventor： Cynthia Chaffin Webb , Charles Wayne Reinhardt Swart , Maarten Meijer , Varun Ramesh
Abstract: 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.
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公开(公告)号：US11608766B2
公开(公告)日：2023-03-21
申请号：US17714810
申请日：2022-04-06
Applicant: PACCAR Inc
Inventor： Charles Wayne Reinhardt Swart , Cynthia Chaffin Webb , Maarten Meijer , Varun Ramesh
Abstract: 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.
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公开(公告)号：US11499463B2
公开(公告)日：2022-11-15
申请号：US17002515
申请日：2020-08-25
Applicant: PACCAR Inc
Inventor： Charles Wayne Reinhardt Swart , Cynthia Chaffin Webb , Maarten Meijer , Varun Ramesh
Abstract: 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.
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