Patents by Inventor Maarten Meijer

Maarten Meijer 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).

  • Patent number: 12359598
    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.
    Type: Grant
    Filed: December 29, 2023
    Date of Patent: July 15, 2025
    Assignee: PACCAR Inc
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh
  • Patent number: 12320287
    Abstract: 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: Grant
    Filed: September 9, 2024
    Date of Patent: June 3, 2025
    Assignee: PACCAR Inc
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
  • Publication number: 20250153593
    Abstract: A battery control component of an electric vehicle may limit charging of a battery on the electric vehicle to a target state of charge (SOC), such as to reserve battery capacity for regenerative braking during downgrades. A computing device associated with the vehicle may calculate an estimated gradient profile and/or an estimated total energy consumption of a predicted upcoming route of the vehicle based on one or more data items, such as GPS data, altitude data, and/or map data. The computing device may determine a target SOC based on the estimated gradient profile. The computing device may determine a confidence factor associated with the estimated gradient profile, where the confidence factor depends on the quantity of data items used to calculate the estimated gradient profile. The computing device may adjust the target SOC based on the confidence factor.
    Type: Application
    Filed: November 13, 2024
    Publication date: May 15, 2025
    Applicant: PACCAR Inc
    Inventors: Satvik Khuntia, Nicholas Lee Hertlein, Maarten Meijer, James Nelson
  • Publication number: 20250092809
    Abstract: 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: Application
    Filed: September 9, 2024
    Publication date: March 20, 2025
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
  • Patent number: 12152543
    Abstract: A method includes detecting a diesel engine runaway event in a diesel engine and, in response to detecting the diesel engine runaway event, deactivating all cylinders in the diesel engine such that no combustion occurs in any cylinders of the diesel engine and no cylinders of the diesel engine produce power, wherein deactivating the cylinders of the diesel engine includes mechanically decoupling a camshaft of the diesel engine from inlet valves of the cylinders of the diesel engine, and wherein deactivating cylinders of the diesel engine prevents flow of air from an intake manifold into combustion chambers of the cylinders.
    Type: Grant
    Filed: September 8, 2023
    Date of Patent: November 26, 2024
    Assignee: PACCAR Inc
    Inventors: Nick Hertlein, Maarten Meijer, Steve Ciatti, Charles Wayne Reinhardt Swart
  • Patent number: 12085001
    Abstract: 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: Grant
    Filed: June 28, 2023
    Date of Patent: September 10, 2024
    Assignee: PACCAR Inc
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
  • Publication number: 20240254935
    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.
    Type: Application
    Filed: April 15, 2024
    Publication date: August 1, 2024
    Applicant: PACCAR Inc
    Inventors: Trevor OTT, Maarten MEIJER, Stephen CIATTI, Brandon ROUSE
  • Publication number: 20240209763
    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.
    Type: Application
    Filed: December 29, 2023
    Publication date: June 27, 2024
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh
  • Patent number: 11988163
    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.
    Type: Grant
    Filed: September 9, 2022
    Date of Patent: May 21, 2024
    Inventors: Trevor Ott, Maarten Meijer, Stephen Ciatti, Brandon Rouse
  • Patent number: 11976582
    Abstract: 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: Grant
    Filed: August 25, 2020
    Date of Patent: May 7, 2024
    Assignee: PACCAR INC
    Inventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
  • Publication number: 20240084751
    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.
    Type: Application
    Filed: September 9, 2022
    Publication date: March 14, 2024
    Applicant: PACCAR Inc
    Inventors: Trevor OTT, Maarten MEIJER, Stephen CIATTI, Brandon ROUSE
  • Patent number: 11927126
    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.
    Type: Grant
    Filed: October 13, 2022
    Date of Patent: March 12, 2024
    Assignee: PACCAR INC
    Inventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
  • Publication number: 20240060439
    Abstract: 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: Application
    Filed: June 28, 2023
    Publication date: February 22, 2024
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
  • Patent number: 11879367
    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.
    Type: Grant
    Filed: August 25, 2020
    Date of Patent: January 23, 2024
    Assignee: PACCAR Inc
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh
  • Patent number: 11808194
    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.
    Type: Grant
    Filed: April 13, 2022
    Date of Patent: November 7, 2023
    Assignee: PACCAR Inc.
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Phillip William Stephenson, Trevor Joseph Ott
  • Patent number: 11761396
    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.
    Type: Grant
    Filed: March 28, 2022
    Date of Patent: September 19, 2023
    Assignee: PACCAR INC
    Inventors: Cynthia Chaffin Webb, Michael Douglas Gerty, Uday Vadlamani, Kimberly Denise McKinnon, Constantin Emil Nedelcu, Maarten Meijer, Charles Wayne Reinhardt Swart
  • Patent number: 11725560
    Abstract: 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: Grant
    Filed: August 25, 2020
    Date of Patent: August 15, 2023
    Assignee: PACCAR INC
    Inventors: Cynthia Chaffin Webb, Charles Wayne Reinhardt Swart, Maarten Meijer, Varun Ramesh, John Lahti
  • Patent number: 11608766
    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.
    Type: Grant
    Filed: April 6, 2022
    Date of Patent: March 21, 2023
    Assignee: PACCAR INC
    Inventors: Charles Wayne Reinhardt Swart, Cynthia Chaffin Webb, Maarten Meijer, Varun Ramesh
  • Publication number: 20230034184
    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.
    Type: Application
    Filed: October 13, 2022
    Publication date: February 2, 2023
    Inventors: Charles Wayne Reinhardt SWART, Cynthia Chaffin WEBB, Maarten MEIJER, Varun RAMESH
  • Publication number: 20220397073
    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.
    Type: Application
    Filed: March 28, 2022
    Publication date: December 15, 2022
    Inventors: Cynthia Chaffin Webb, Michael Douglas Gerty, Uday Vadlamani, Kimberly Denise McKinnon, Constantin Emil Nedelcu, Maarten Meijer, Charles Wayne Reinhardt Swart