Patents by Inventor Darius Mehta
Darius Mehta 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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Publication number: 20240001734Abstract: An electric vehicle thermal management system for compressing a low pressure refrigerant with a centrifugal compressor to generate a high pressure refrigerant, determining a battery cooling condition, routing one of the low pressure refrigerant and the high pressure refrigerant to the heat exchanger in response to the battery cooling condition, regulating a transfer of heat between the refrigerant loop and the battery cooling loop in response to a temperature of the battery coolant within the battery cooling loop and the battery cooling condition, and regulating the transfer of heat between the battery coolant loop and a cabin coolant loop in response to the HVAC setting and a cabin coolant temperature within the cabin coolant loop.Type: ApplicationFiled: June 29, 2022Publication date: January 4, 2024Applicant: Garrett Transportation I IncInventors: Darius Mehta, Robert Cadle
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Patent number: 10598109Abstract: Systems and methods are provided for preheating emissions control devices prior to engine startup using a heating element and a flow control device operable to provide a fluid flow, such as a compressor or a turbine. One exemplary method of heating an emissions control component prior to engine startup involves opening or otherwise operating a valve to provide a path for fluid flow to the emissions control component, operating a flow control device to provide the fluid flow through the path, and activating a heating element upstream of the emissions control component to heat the fluid flow to the emissions control component.Type: GrantFiled: January 18, 2018Date of Patent: March 24, 2020Assignee: Garrett Transportation I Inc.Inventor: Darius Mehta
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Patent number: 10570822Abstract: A turbocharger system includes a manifold system that maintains separation between flow paths of different manifold arrangements. One manifold arrangement directs flow from a first group of combustion chambers to a first volute passage of a turbine section of a turbocharger. Another manifold arrangement directs flow from a second group of combustion chambers to a second volute passage of the turbine section of the turbocharger. The system also provides selective variation of the available volume for exhaust flow through the manifold arrangements.Type: GrantFiled: June 26, 2017Date of Patent: February 25, 2020Assignee: GARRETT TRANSPORTATION I INC.Inventor: Darius Mehta
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Publication number: 20180371992Abstract: A turbocharger system includes a manifold system that maintains separation between flow paths of different manifold arrangements. One manifold arrangement directs flow from a first group of combustion chambers to a first volute passage of a turbine section of a turbocharger. Another manifold arrangement directs flow from a second group of combustion chambers to a second volute passage of the turbine section of the turbocharger. The system also provides selective variation of the available volume for exhaust flow through the manifold arrangements.Type: ApplicationFiled: June 26, 2017Publication date: December 27, 2018Applicant: HONEYWELL INTERNATIONAL INC.Inventor: Darius Mehta
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Publication number: 20180340480Abstract: Systems and methods are provided for preheating emissions control devices prior to engine startup using a heating element and a flow control device operable to provide a fluid flow, such as a compressor or a turbine. One exemplary method of heating an emissions control component prior to engine startup involves opening or otherwise operating a valve to provide a path for fluid flow to the emissions control component, operating a flow control device to provide the fluid flow through the path, and activating a heating element upstream of the emissions control component to heat the fluid flow to the emissions control component.Type: ApplicationFiled: January 18, 2018Publication date: November 29, 2018Applicant: HONEYWELL INTERNATIONAL INC.Inventor: Darius Mehta
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Patent number: 9845713Abstract: A valve actuation system for an internal combustion engine is disclosed. The engine has a first set of cylinders having a first set of exhaust valves and a second set of cylinders having a second set of exhaust valves. The valve actuation system for the exhaust valves includes one or more first cams having a compression-release lobe and a main exhaust lobe adapted to transfer valve actuation motion to the first set of exhaust valves, and one or more second cams having an early exhaust valve opening (EEVO) lobe and a main exhaust lobe adapted to transfer valve actuation motion to the second set of exhaust valves. The valve actuation system may provide any combination of (i) main exhaust valve actuation with or without compression release actuation with (ii) main exhaust valve actuation with or without EEVO for the two sets of cylinders.Type: GrantFiled: November 30, 2015Date of Patent: December 19, 2017Assignee: Jacobs Vehicle Systems, Inc.Inventors: Steven N. Ernest, Darius Mehta
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Publication number: 20160146072Abstract: A valve actuation system for an internal combustion engine is disclosed. The engine has a first set of cylinders having a first set of exhaust valves and a second set of cylinders having a second set of exhaust valves. The valve actuation system for the exhaust valves includes one or more first cams having a compression-release lobe and a main exhaust lobe adapted to transfer valve actuation motion to the first set of exhaust valves, and one or more second cams having an early exhaust valve opening (EEVO) lobe and a main exhaust lobe adapted to transfer valve actuation motion to the second set of exhaust valves. The valve actuation system may provide any combination of (i) main exhaust valve actuation with or without compression release actuation with (ii) main exhaust valve actuation with or without EEVO for the two sets of cylinders.Type: ApplicationFiled: November 30, 2015Publication date: May 26, 2016Inventors: Steven N. ERNEST, Darius Mehta
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Patent number: 9027333Abstract: Methods and systems for reducing hydrocarbon emissions from an internal combustion engine. The engine's exhaust aftertreatment system has at least a particulate matter (soot) filter and means for actively regenerating the particulate matter filter. During operation of the engine, the soot loading state of the particulate matter filter is monitored. The filter is regenerated when required, but the regeneration is controlled so that the particulate matter filter retains a small level of soot loading. This soot “pre-loading” ensures hydrocarbon reduction during the next cold start.Type: GrantFiled: July 1, 2013Date of Patent: May 12, 2015Assignee: Southwest Research InstituteInventors: Gary D. Neely, Darius Mehta
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Patent number: 8944024Abstract: An internal combustion engine comprising a plurality of reciprocating pistons within an engine block, each piston having linear movement convertable to rotating movement via a connecting rod connecting each piston to a crankshaft; the crankshaft rotatable about a linear axis, the crankshaft having a plurality of main journals, each main journal rotatable on a main bearing which supports the crankshaft within the engine block; and wherein at least one of the main bearings comprises a fluid film bearing and a magnetic bearing.Type: GrantFiled: July 25, 2012Date of Patent: February 3, 2015Assignee: Southwest Research InstituteInventors: Radu C. Florea, Darius Mehta
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Patent number: 8948999Abstract: A method of stoichiometrically operating a diesel-fueled internal combustion engine. During a main (conventional) fuel injection event, fuel is injected into the cylinders. The air-fuel ratio during this main fuel injection event is stoichiometric. The cylinders are operated by either advancing the exhaust valve closing or modifying the phasing of the exhaust and intake valve lift events, to achieve a negative valve overlap period between the end of the exhaust phase and the beginning of the intake phase of the engine cycle. Fuel is injected into the cylinders during the negative valve overlap period, which results in highly reactive fuel and reduces ignition delay during the main fuel injection event.Type: GrantFiled: July 3, 2011Date of Patent: February 3, 2015Assignee: Southwest Research InstituteInventors: Darius Mehta, Chad P. Koci, Charles E. Roberts, Jr.
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Publication number: 20150000254Abstract: Methods and systems for reducing hydrocarbon emissions from an internal combustion engine. The engine's exhaust aftertreatment system has at least a particulate matter (soot) filter and means for actively regenerating the particulate matter filter. During operation of the engine, the soot loading state of the particulate matter filter is monitored. The filter is regenerated when required, but the regeneration is controlled so that the particulate matter filter retains a small level of soot loading. This soot “pre-loading” ensures hydrocarbon reduction during the next cold start.Type: ApplicationFiled: July 1, 2013Publication date: January 1, 2015Inventors: Gary D. Neely, Darius Mehta
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Patent number: 8857154Abstract: A method of treating NOx-containing exhaust from an internal combustion engine. An exhaust aftertreatment system has the following devices arranged in the following order downstream the exhaust manifold: a lean NOx trap (LNT), a particulate filter (PF) and a selective reduction catalyst (SCR) device. At least the LNT is located in the engine compartment. The SCR temperature at the input to, or in, the SCR is monitored to determine whether the aftertreatment system is to be operated in a cold mode or warm mode. Only during warm mode is reductant provided to the SCR, and during warm mode the LNT is not regenerated.Type: GrantFiled: January 23, 2012Date of Patent: October 14, 2014Assignee: Southwest Research InstituteInventor: Darius Mehta
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Publication number: 20140026843Abstract: An internal combustion engine comprising a plurality of reciprocating pistons within an engine block, each piston having linear movement convertable to rotating movement via a connecting rod connecting each piston to a crankshaft; the crankshaft rotatable about a linear axis, the crankshaft having a plurality of main journals, each main journal rotatable on a main bearing which supports the crankshaft within the engine block; and wherein at least one of the main bearings comprises a fluid film bearing and a magnetic bearing.Type: ApplicationFiled: July 25, 2012Publication date: January 30, 2014Applicant: SOUTHWEST RESEARCH INSTITUTEInventors: Radu C. FLOREA, Darius MEHTA
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Patent number: 8594909Abstract: A method of stoichiometrically operating a diesel-fueled internal combustion engine. A control unit is provide with stored data representing, within a range of exhaust valve timing or event modifications, an amount of fresh air flow and exhaust gas residuals resulting from each modification. During operation of the engine, the control unit is used to determine a desired amount of exhaust gas residuals for a given engine load; to access the stored data to determine a modification that will provide the desired amount of exhaust gas residuals; and to generate a control signal that will result in the desired modification.Type: GrantFiled: July 2, 2011Date of Patent: November 26, 2013Assignee: Southwest Research InstituteInventors: Chad P. Koci, Darius Mehta, Charles E. Roberts, Jr.
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Publication number: 20130186064Abstract: A method of treating NOx-containing exhaust from an internal combustion engine. An exhaust aftertreatment system has the following devices arranged in the following order downstream the exhaust manifold: a lean NOx trap (LNT), a particulate filter (PF) and a selective reduction catalyst (SCR) device. At least the LNT is located in the engine compartment. The SCR temperature at the input to, or in, the SCR is monitored to determine whether the aftertreatment system is to be operated in a cold mode or warm mode. Only during warm mode is reductant provided to the SCR, and during warm mode the LNT is not regenerated.Type: ApplicationFiled: January 23, 2012Publication date: July 25, 2013Applicant: SOUTHWEST RESEARCH INSTITUTEInventor: Darius Mehta
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Publication number: 20130000620Abstract: A method of stoichiometrically operating a diesel-fueled internal combustion engine. A control unit is provide with stored data representing, within a range of exhaust valve timing or event modifications, an amount of fresh air flow and exhaust gas residuals resulting from each modification. During operation of the engine, the control unit is used to determining a desired amount of exhaust gas residuals for a given engine load; accessing the stored data to determine a modification that will provide the desired amount of exhaust gas residuals; and generating a control signal that will result in the desired modification.Type: ApplicationFiled: July 2, 2011Publication date: January 3, 2013Applicant: SOUTHWEST RESEARCH INSTITUTEInventors: Chad P. Koci, Darius Mehta, Charles E. Roberts, JR.
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Publication number: 20130006498Abstract: A method of stoichiometrically operating a diesel-fueled internal combustion engine. During a main (conventional) fuel injection event, fuel is injected into the cylinders. The air-fuel ratio during this main fuel injection event is stoichiometric. The cylinders are operated by either advancing the exhaust valve closing or modifying the phasing of the exhaust and intake valve lift events, to achieve a negative valve overlap period between the end of the exhaust phase and the beginning of the intake phase of the engine cycle. Fuel is injected into the cylinders during the negative valve overlap period, which results in highly reactive fuel and reduces ignition delay during the main fuel injection event.Type: ApplicationFiled: July 3, 2011Publication date: January 3, 2013Applicant: SOUTHWEST RESEARCH INSTITUTEInventors: Darius Mehta, Chad P. Koci, Charles E. Roberts, JR.
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Patent number: 8291891Abstract: Improved exhaust gas recirculation system and methods that use one or more of the engine's cylinders as dedicated EGR cylinders. All of the exhaust from the dedicated EGR cylinders is recirculated back to the engine intake. Thus, the EGR rate is constant, but the EGR mass flow may be controlled by adjusting the air-fuel ratio of the dedicated EGR cylinders or by using various variable valve timing techniques.Type: GrantFiled: June 17, 2008Date of Patent: October 23, 2012Assignee: Southwest Research InstituteInventors: Terrence Francis Alger, II, Barrett Wade Mangold, Jess Witman Gingrich, Darius Mehta
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Publication number: 20120029789Abstract: A method of preventing a pre-ignition event within a cylinder (20) of a spark ignition engine (100) involves taking in-cylinder measurements and using the measurements to determine the instantaneous heat being released within the cylinder (20) as a function crank angle. If significant heat is being released before the intended spark timing, additional fuel is injected into the cylinder (20) immediately following the detection of early heat release (pre-ignition) within the same engine cycle, preferably within 45 crank angle degrees following the detection of pre-ignition. The additional fuel quenches the heat released within the cylinder (20) to prevent a pre-ignition event.Type: ApplicationFiled: July 12, 2011Publication date: February 2, 2012Applicant: Southwest Research InstituteInventors: Darius Mehta, Terrence F. Alger, II, Manfred Amann, Jayant V. Sarlashkar
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Publication number: 20110011082Abstract: A method and system for reducing undesired exhaust emissions during cold start of a turbocharger-equipped internal combustion engine. A bypass line in the engine compartment has a bypass valve that permits exhaust to be bypassed around the turbocharger's turbine during cold start. An oxidation catalyst is closely coupled to the bypass valve.Type: ApplicationFiled: July 14, 2009Publication date: January 20, 2011Applicant: Southwest Research InstituteInventors: Darius Mehta, Terrence F. Alger, II, Chad P. Koci