Patents by Inventor John N. Chi
John N. Chi 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: 9890717Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: GrantFiled: September 16, 2016Date of Patent: February 13, 2018Assignee: CUMMINS INC.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Patent number: 9778143Abstract: A system and method are provided for estimating an operating parameter of an exhaust manifold of an engine. In the system, a flow value is determined that corresponds to a flow rate of exhaust gas through an EGR conduit fluidly coupled between the exhaust manifold and the intake manifold. The EGR conduit includes an exhaust gas cooler disposed in-line with the EGR conduit and a property of the exhaust gas exiting an exhaust gas outlet of the cooler is measured. The operating parameter of the exhaust manifold is estimated as a function of at least the flow value and the property of the exhaust gas exiting the exhaust gas outlet of the cooler. Illustratively, the operating parameter of the exhaust manifold may be exhaust manifold pressure and/or temperature.Type: GrantFiled: May 14, 2015Date of Patent: October 3, 2017Assignee: Cummins Inc.Inventors: John N. Chi, Indranil Brahma
-
Publication number: 20170002752Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: ApplicationFiled: September 16, 2016Publication date: January 5, 2017Inventors: John N. Chi, John M. Mulloy, Siriram S. Popuri
-
Patent number: 9528432Abstract: A system and method are provided for controlling an air handling system for an internal combustion engine including a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor fluidly coupled to an intake manifold of the engine, and an electric motor coupled to a rotatable shaft connected between the compressor and the variable geometry turbine. A target torque required to drive the compressor to achieve target compressor operating parameters is determined, a maximum available torque that can be supplied by the variable geometry turbine in response to a target exhaust gas flow through the variable geometry turbine is determined, and the electric motor is enabled to supply supplemental torque to the rotatable shaft if the target torque is greater than the maximum available torque.Type: GrantFiled: September 25, 2011Date of Patent: December 27, 2016Assignee: Cummins, Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma
-
Patent number: 9453468Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: GrantFiled: November 10, 2014Date of Patent: September 27, 2016Assignee: Cummins Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Publication number: 20150323421Abstract: A system and method are provided for estimating an operating parameter of an exhaust manifold of an engine. In the system, a flow value is determined that corresponds to a flow rate of exhaust gas through an EGR conduit fluidly coupled between the exhaust manifold and the intake manifold. The EGR conduit includes an exhaust gas cooler disposed in-line with the EGR conduit and a property of the exhaust gas exiting an exhaust gas outlet of the cooler is measured. The operating parameter of the exhaust manifold is estimated as a function of at least the flow value and the property of the exhaust gas exiting the exhaust gas outlet of the cooler. Illustratively, the operating parameter of the exhaust manifold may be exhaust manifold pressure and/or temperature.Type: ApplicationFiled: May 14, 2015Publication date: November 12, 2015Inventors: John N. Chi, Indranil Brahma
-
Patent number: 9181905Abstract: A system controlling an air handling system for an internal combustion engine. An EGR valve in-line with an EGR passageway fluidly coupled between exhaust and intake manifolds of the engine is controllable between fully closed open positions to control a flow rate of exhaust gas through the EGR passageway. A control circuit determines a pump enable value as a function of at least one of a target engine speed and a total fueling target, determines a maximum achievable flow rate of recirculated exhaust gas through the EGR passageway with the EGR valve in the fully open position, and activates an electric gas pump to increase the flow rate of exhaust gas through the EGR passageway if the pump enable value exceeds a threshold pump enable value and a target flow rate of recirculated exhaust gas through the EGR passageway is less than the maximum achievable flow rate.Type: GrantFiled: September 25, 2011Date of Patent: November 10, 2015Assignee: Cummins Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma
-
Patent number: 9062635Abstract: A system and method are provided for estimating an operating parameter of an exhaust manifold of an engine. In the system, a flow value is determined that corresponds to a flow rate of exhaust gas through an EGR conduit fluidly coupled between the exhaust manifold and the intake manifold. The EGR conduit includes an exhaust gas cooler disposed in-line with the EGR conduit and a property of the exhaust gas exiting an exhaust gas outlet of the cooler is measured. The operating parameter of the exhaust manifold is estimated as a function of at least the flow value and the property of the exhaust gas exiting the exhaust gas outlet of the cooler. Illustratively, the operating parameter of the exhaust manifold may be exhaust manifold pressure and/or temperature.Type: GrantFiled: September 25, 2011Date of Patent: June 23, 2015Assignee: Cummins Inc.Inventors: John N. Chi, Indranil Brahma
-
Publication number: 20150057909Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: ApplicationFiled: November 10, 2014Publication date: February 26, 2015Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Patent number: 8892332Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: GrantFiled: September 25, 2011Date of Patent: November 18, 2014Assignee: Cummins, Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Patent number: 8887693Abstract: A system and method are provided for estimating the flow rate of air entering an air inlet of a turbocharger compressor. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a speed value corresponds to an operating speed of the turbocharger. The flow rate of air entering the air inlet of the turbocharger compressor is illustratively estimated as a function of the first pressure value, the second pressure value, the temperature value and the speed value.Type: GrantFiled: September 25, 2011Date of Patent: November 18, 2014Assignee: Cummins, Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Patent number: 8783030Abstract: A system and method are provided for controlling an air handling system for an internal combustion engine including a turbocharger having a variable geometry turbine and a compressor having a fresh air inlet fluidly coupled to ambient and to an air outlet of an electric air pump. An air pump enable value as determined a function of target engine speed and total fuel target values and an air flow target is determined as a function of a target fresh air flow value. Operation of the electric air pump is activated to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value.Type: GrantFiled: September 25, 2011Date of Patent: July 22, 2014Assignee: Cummins Inc.Inventors: John N Chi, John M Mulloy, Sriram S Popuri, Timothy R Frazier, Martin T Books, Divakar Rajamohan, Indranil Brahma
-
Patent number: 8677748Abstract: An apparatus includes an operating conditions module that interprets a number of compressor operating parameters; a compressor flow module that determines a compressor inlet flow in response to the number of compressor operating parameters; and a fresh air flow module that provides a fresh air flow value in response to the compressor inlet flow. The operating conditions module further interprets a current mass air flow value, and the apparatus further includes a mass air flow sensor trimming module that adjusts a mass air flow sensor drift value in response to the current mass air flow value and the fresh air flow value. The apparatus includes a diagnostics module that determines a mass air flow sensor is failed in response to the current mass air flow value and the fresh air flow value.Type: GrantFiled: June 3, 2011Date of Patent: March 25, 2014Assignee: Cummins Inc.Inventors: Indranil Brahma, Ashwin Vyas, Vivek Anand Sujan, Phanindra Garimella, John N. Chi, Abdoul Karim Abdoul Azizou
-
Patent number: 8567192Abstract: A system is provided for controlling an air handling system for an internal combustion engine. A dual-stage turbocharger includes a high-pressure compressor and variable geometry turbine combination fluidly coupled to a low-pressure compressor and variable geometry turbine combination. A control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a target low-pressure compressor ratio, a target high-pressure compressor ratio, a target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure as a function of a target outlet pressure of the high-pressure compressor and a temperature, a pressure and a target flow rate of air entering the air inlet of the low-pressure compressor, and to control the geometries of the low-pressure and high-pressure turbines as a function of the target low-pressure compressor ratio the target high-pressure compressor ratio respectively.Type: GrantFiled: September 25, 2011Date of Patent: October 29, 2013Assignee: Cummins, Inc.Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma, Xi Wei
-
Publication number: 20130074492Abstract: A system is provided for controlling an air handling system for an internal combustion engine. A dual-stage turbocharger includes a high-pressure compressor and variable geometry turbine combination fluidly coupled to a low-pressure compressor and variable geometry turbine combination. A control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a target low-pressure compressor ratio, a target high-pressure compressor ratio, a target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure as a function of a target outlet pressure of the high-pressure compressor and a temperature, a pressure and a target flow rate of air entering the air inlet of the low-pressure compressor, and to control the geometries of the low-pressure and high-pressure turbines as a function of the target low-pressure compressor ratio the target high-pressure compressor ratio respectively.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma, Xi Wei
-
Publication number: 20130074495Abstract: A system and method are provided for controlling an air handling system for an internal combustion engine including a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor fluidly coupled to an intake manifold of the engine, and an electric motor coupled to a rotatable shaft connected between the compressor and the variable geometry turbine. A target torque required to drive the compressor to achieve target compressor operating parameters is determined, a maximum available torque that can be supplied by the variable geometry turbine in response to a target exhaust gas flow through the variable geometry turbine is determined, and the electric motor is enabled to supply supplemental torque to the rotatable shaft if the target torque is greater than the maximum available torque.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma
-
Publication number: 20130080025Abstract: A system and method are provided for estimating the flow rate of air entering an air inlet of a turbocharger compressor. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a speed value corresponds to an operating speed of the turbocharger. The flow rate of air entering the air inlet of the turbocharger compressor is illustratively estimated as a function of the first pressure value, the second pressure value, the temperature value and the speed value.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Publication number: 20130080030Abstract: A peak value of an operating parameter of an internal combustion engine cylinder is determined during each of a series of engine cycles. An engine position signal produced by an engine position sensor is processed to determine engine position relative to a reference engine position. A combustion portion of a current engine cycle is partitioned into a number of side-by-side combustion packets each having a packet duration of a predetermined change in engine position. The engine position is monitored, and for each of the number of side-by-side combustion packets of the combustion portion of the current engine cycle, the operating parameter of the cylinder is estimated. The peak value of the operating parameter of the cylinder during the current engine cycle is determined as a maximum-valued one of the number of estimated operating parameters of the cylinder, and the peak value of the operating parameter is stored in memory.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventor: John N. Chi
-
Publication number: 20130080024Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri
-
Publication number: 20130074496Abstract: A system and method are provided for controlling an air handling system for an internal combustion engine including a turbocharger having a variable geometry turbine and a compressor having a fresh air inlet fluidly coupled to ambient and to an air outlet of an electric air pump. An air pump enable value as determined a function of target engine speed and total fuel target values and an air flow target is determined as a function of a target fresh air flow value. Operation of the electric air pump is activated to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value.Type: ApplicationFiled: September 25, 2011Publication date: March 28, 2013Inventors: John N. Chi, John M. Mulloy, Sriram S. Popuri, Timothy R. Frazier, Martin T. Books, Divakar Rajamohan, Indranil Brahma