Patents by Inventor Dan STENQVIST
Dan STENQVIST 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: 11976603Abstract: A method performed by a control unit in connection with a pre-heating process of an aftertreatment system for a combustion engine is provided. The control unit obtains a scheduled start time of the combustion engine. The control unit schedules a pre-heating of the aftertreatment system to be completed before the scheduled start time. The control unit detects a start of the combustion engine at an actual start time. In response to the detected start of the combustion engine, and using the actual and scheduled start times, the control unit determines whether the scheduled pre-heating of the aftertreatment system fulfils one or more success criteria. When the one or more success criteria are fulfilled, the control unit triggers a performance increase of the combustion engine.Type: GrantFiled: January 19, 2023Date of Patent: May 7, 2024Assignee: VOLVO TRUCK CORPORATIONInventors: Martin Wilhelmsson, Dan Stenqvist, Irman Svraka
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Publication number: 20240141816Abstract: A method of operating a reducing agent injector includes determining a reference level of toxic substances exhausted from a catalytic reduction arrangement when injecting reducing agent at the pre-set mass flow rate; controlling a reducing agent injector to inject reducing agent at a first mass flow rate, the first mass flow rate being different from the pre-set mass flow rate; determining a first level of toxic substances exhausted from the catalytic reduction arrangement after injecting reducing agent at the first mass flow rate; determining which one of the reference level of toxic substances and the first level of toxic substances being a lowest level of toxic substances; updating the pre-set mass flow rate of the predefined injection model to an updated pre-set mass flow rate as the mass flow rate causing the catalytic reduction arrangement to exhaust the lowest level of toxic substances; and controlling the reducing agent injector to inject reducing agent at the updated pre-set mass flow rate.Type: ApplicationFiled: October 17, 2023Publication date: May 2, 2024Applicant: Volvo Truck CorporationInventors: Dan STENQVIST, Martin Wilhelmsson, Per-Johan Carlsson
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Patent number: 11970962Abstract: A method for adapting a urea deposit build up model used for estimating an amount of urea deposits in an aftertreatment system of a vehicle including a catalytic reduction device is provided.Type: GrantFiled: May 18, 2023Date of Patent: April 30, 2024Assignee: VOLVO TRUCK CORPORATIONInventors: Dan Stenqvist, Murtaza Khambaty
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Patent number: 11933212Abstract: An exhaust aftertreatment system, EATS, for converting NOx emissions in exhaust gases from an engine. The EATS includes a fluid channel for providing a fluid pathway for the exhaust gases; a selective catalytic reduction, SCR, catalyst arranged in the fluid channel, the SCR catalyst being configured to store ammonia; an injector configured to inject a reductant for providing ammonia to the SCR catalyst, the injector being arranged upstream of the SCR catalyst; a fluid flow inducer configured to cause an induced fluid flow in at least a part of the fluid channel when the engine is turned off; and a controlling apparatus configured to precondition the EATS prior to engine start by injecting the reductant into the fluid channel, and transport the reductant into the SCR catalyst by the induced fluid flow to store ammonia in the SCR catalyst.Type: GrantFiled: September 27, 2022Date of Patent: March 19, 2024Assignee: VOLVO TRUCK CORPORATIONInventors: Irman Svraka, Dan Stenqvist, Martin Wilhelmsson
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Publication number: 20230374927Abstract: A method for adapting a urea deposit build up model used for estimating an amount of urea deposits in an aftertreatment system of a vehicle including a catalytic reduction device is provided.Type: ApplicationFiled: May 18, 2023Publication date: November 23, 2023Applicant: Volvo Truck CorporationInventors: Dan STENQVIST, Murtaza Khambaty
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Patent number: 11795885Abstract: A method for controlling the operation of an engine system in a vehicle upon engine start. The engine system includes an engine and an exhaust aftertreatment system having a selective catalyst reduction, SCR, catalyst and a reductant dosing system for providing a reductant to the SCR catalyst. The method comprises: determining the temperature of the SCR catalyst; in response of determining that the temperature of the SCR catalyst is above a predetermined threshold, initiating pressurising of the reductant dosing system towards a predefined operating pressure; performing a preventive action for delaying engine start until the operating pressure of the reductant dosing system is reached.Type: GrantFiled: October 12, 2022Date of Patent: October 24, 2023Assignee: VOLVO TRUCK CORPORATIONInventors: Dan Stenqvist, Martin Wilhelmsson
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Publication number: 20230235711Abstract: A method performed by a control unit in connection with a pre-heating process of an aftertreatment system for a combustion engine is provided. The control unit obtains a scheduled start time of the combustion engine. The control unit schedules a pre-heating of the aftertreatment system to be completed before the scheduled start time. The control unit detects a start of the combustion engine at an actual start time. In response to the detected start of the combustion engine, and using the actual and scheduled start times, the control unit determines whether the scheduled pre-heating of the aftertreatment system fulfils one or more success criteria. When the one or more success criteria are fulfilled, the control unit triggers a performance increase of the combustion engine.Type: ApplicationFiled: January 19, 2023Publication date: July 27, 2023Inventors: Martin Wilhelmsson, Dan Stenqvist, Irman Svraka
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Patent number: 11686237Abstract: A method for NOx emission control during start of a vehicle comprising an exhaust aftertreatment system, an engine, and a NOx sensor is provided. The method includes determining a temperature of the NOx sensor; if the determined temperature of the NOx sensor is below a predetermined threshold, initiating heating of the NOx sensor, and performing a preventive action for delaying engine start until a determined temperature of the NOx sensor exceeds or is equal to the predetermined threshold.Type: GrantFiled: June 22, 2022Date of Patent: June 27, 2023Assignee: VOLVO TRUCK CORPORATIONInventors: Dan Stenqvist, Martin Wilhelmsson
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Publication number: 20230167759Abstract: A computer implemented method to performing sensor analysis in an exhaust gas aftertreatment system (EATS) coupled downstream of an internal combustion engine (ICE). The methodology is specifically adapted for determining a scale factor for a NOx sensor that is arranged downstream of a position where an amount of a reductant is injected into exhaust gases from the ICE.Type: ApplicationFiled: November 22, 2022Publication date: June 1, 2023Applicant: VOLVO TRUCK CORPORATIONInventors: Dan STENQVIST, Gustaf Lindberg
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Publication number: 20230121839Abstract: A method for controlling the operation of an engine system in a vehicle upon engine start. The engine system includes an engine and an exhaust aftertreatment system having a selective catalyst reduction, SCR, catalyst and a reductant dosing system for providing a reductant to the SCR catalyst. The method comprises: determining the temperature of the SCR catalyst; in response of determining that the temperature of the SCR catalyst is above a predetermined threshold, initiating pressurising of the reductant dosing system towards a predefined operating pressure; performing a preventive action for delaying engine start until the operating pressure of the reductant dosing system is reached.Type: ApplicationFiled: October 12, 2022Publication date: April 20, 2023Applicant: VOLVO TRUCK CORPORATIONInventors: Dan STENQVIST, Martin Wilhelmsson
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Publication number: 20230109112Abstract: An exhaust aftertreatment system, EATS, for converting NOx emissions in exhaust gases from an engine. The EATS includes a fluid channel for providing a fluid pathway for the exhaust gases; a selective catalytic reduction, SCR, catalyst arranged in the fluid channel, the SCR catalyst being configured to store ammonia; an injector configured to inject a reductant for providing ammonia to the SCR catalyst, the injector being arranged upstream of the SCR catalyst; a fluid flow inducer configured to cause an induced fluid flow in at least a part of the fluid channel when the engine is turned off; and a controlling apparatus configured to precondition the EATS prior to engine start by injecting the reductant into the fluid channel, and transport the reductant into the SCR catalyst by the induced fluid flow to store ammonia in the SCR catalyst.Type: ApplicationFiled: September 27, 2022Publication date: April 6, 2023Applicant: VOLVO Truck CorporationInventors: Irman Svraka, Dan Stenqvist, Martin Wilhelmsson
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Publication number: 20230003163Abstract: A method for NOx emission control during start of a vehicle comprising an exhaust aftertreatment system, an engine, and a NOx sensor is provided. The method includes determining a temperature of the NOx sensor; if the determined temperature of the NOx sensor is below a predetermined threshold, initiating heating of the NOx sensor, and performing a preventive action for delaying engine start until a determined temperature of the NOx sensor exceeds or is equal to the predetermined threshold.Type: ApplicationFiled: June 22, 2022Publication date: January 5, 2023Applicant: Volvo Truck CorporationInventors: Dan STENQVIST, Martin WILHELMSSON