Patents by Inventor Baohua Qi
Baohua Qi 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: 10927741Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.Type: GrantFiled: February 4, 2019Date of Patent: February 23, 2021Assignee: Cummins Emission Solutions Inc.Inventors: Xi Wei, David Samuel Everard, Baohua Qi, Mickey R. McDaniel, Edmund P. Hodzen, Guoqiang Li
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Patent number: 10473014Abstract: An injector for delivering a working fluid into a working environment is disclosed. According to one embodiment of the present invention, the injector includes a pre-metering chamber with a control valve controlling fluid delivery rate and a swirl chamber, in which a swirling flow is created and atomization is achieved at low injector pressure when it is released. In another embodiment, the injector includes a swirl chamber and an atomization element with a bore, through which a control valve is positioned. The control valve forces a working fluid flow through the atomization element when the injector is energized to create a metered swirling flow. To avoid issues with deteriorated working fluid, a purging apparatus is used for emptying working fluid residue in the injector, and a special control method is used when the injector works in a high-temperature working environment.Type: GrantFiled: October 7, 2016Date of Patent: November 12, 2019Inventor: Baohua Qi
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Publication number: 20190178133Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.Type: ApplicationFiled: February 4, 2019Publication date: June 13, 2019Inventors: Xi Wei, David Samuel Everard, Baohua Qi, Mickey R. McDaniel, Edmund P. Hodzen, Guoquian Li
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Patent number: 10315162Abstract: Systems and methods are disclosed for determining or diagnosing a reagent dosing system failure to provide sufficient reagent to an exhaust aftertreatment system that includes an SCR catalyst to satisfy a reagent dosing command.Type: GrantFiled: October 10, 2017Date of Patent: June 11, 2019Assignee: Cummins Emission Solutions Inc.Inventors: Balbahadur Singh, Clyde W. Xi, Mickey R. McDaniel, Baohua Qi, Paul C. McAvoy
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Patent number: 10196955Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.Type: GrantFiled: June 8, 2016Date of Patent: February 5, 2019Assignee: Cummins Emission Solutions Inc.Inventors: Xi Wei, David Samuel Everard, Baohua Qi, Mickey R. McDaniel, Edmund P. Hodzen, Guoquian Li
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Patent number: 9951673Abstract: An aftertreatment device for reducing NOx, PM, HC, and CO generated by a compression-ignition engine. In this device, lean exhaust air generated in the engine is enriched using a reactor together with an oxygen sorption device according to a target deNOx efficiency value, and heat energy is recovered. The enriched exhaust gas then passes through an oxidation catalyst, where NOx is reduced with CO and HC. PM in the exhaust gas is further trapped in a DPF. To lower energy cost, an heat exchanger is used for more effectively heating the DPF during regeneration, and an exhaust gas compressor positioned upstream from the DPF is employed to control engine back pressure. When exhaust gas temperature is low, to regenerate the DPF with minimum energy consumption, an electrical heater is used to heat dosing fuel before it is mixed with exhaust gas, and a regeneration heating process is then jump-started.Type: GrantFiled: February 12, 2016Date of Patent: April 24, 2018Inventors: Baohua Qi, Mi Yan
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Patent number: 9939399Abstract: A system to detect the presence of a catalyst includes an exhaust gas tube, a first temperature sensing device, a second temperature sensing device, a flow rate measurement device, and a processing device. The first temperature sensing device measures a first temperature of exhaust gas upstream of the exhaust gas tube. The second temperature sensing device measures a second temperature of the exhaust gas downstream of the exhaust gas tube. The processing device estimates an expected time delay between the measured inlet and outlet exhaust gas temperatures corresponding to a system with a catalyst present. The processing device may also determine the presence of a catalyst by comparing the measured second temperature to the measured first temperature and comparing the measured second temperature to an estimated delayed first temperature associated with the expected time delay.Type: GrantFiled: April 17, 2017Date of Patent: April 10, 2018Assignee: CUMMINS FILTRATION IP, INC.Inventors: Carlos Lana, Baohua Qi
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Patent number: 9890678Abstract: A multi-stage SCR control system including a front reductant dosing device, a front SCR device, a back reductant dosing device, a back SCR device, and a dosing controller. In normal control cycles, a NSR of the front SCR device is controlled below a stoichiometric reaction ratio to decrease system sensitivity to catalyst aging. In a diagnostic cycle, the NSR of the front or the back SCR device is controlled lower than the stoichiometric reaction ratio, and a reductant quality ratio, which is indicative of reductant quality and dosing accuracy, is calculated. In another diagnostic cycle, the NSR is controlled above the stoichiometric reaction ratio, and an average deNOx efficiency is calculated. The reductant quality ratio and the average deNOx efficiency values are further used in SCR feedback control and permanent catalyst damages can also be isolated from temporary catalyst poisons with these values after a thermal recovery event is completed.Type: GrantFiled: October 1, 2014Date of Patent: February 13, 2018Inventor: Baohua Qi
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Publication number: 20180028976Abstract: Systems and methods are disclosed for determining or diagnosing a reagent dosing system failure to provide sufficient reagent to an exhaust aftertreatment system that includes an SCR catalyst to satisfy a reagent dosing command.Type: ApplicationFiled: October 10, 2017Publication date: February 1, 2018Applicant: Cummins Emission Solutions Inc.Inventors: Balbahadur SINGH, Clyde W. XI, Mickey R. MCDANIEL, Baohua QI, Paul C. MCAVOY
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Patent number: 9839877Abstract: Systems and methods are disclosed for determining or diagnosing a reagent dosing system failure to provide sufficient reagent to an exhaust aftertreatment system that includes an SCR catalyst to satisfy a reagent dosing command.Type: GrantFiled: October 10, 2013Date of Patent: December 12, 2017Assignee: CUMMINS EMISSION SOLUTIONS INC.Inventors: Balbahadur Singh, Clyde W. Xi, Mickey R. McDaniel, Baohua Qi, Paul C. McAvoy
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Publication number: 20170219508Abstract: A system to detect the presence of a catalyst includes an exhaust gas tube, a first temperature sensing device, a second temperature sensing device, a flow rate measurement device, and a processing device. The first temperature sensing device measures a first temperature of exhaust gas upstream of the exhaust gas tube. The second temperature sensing device measures a second temperature of the exhaust gas downstream of the exhaust gas tube. The processing device estimates an expected time delay between the measured inlet and outlet exhaust gas temperatures corresponding to a system with a catalyst present. The processing device may also determine the presence of a catalyst by comparing the measured second temperature to the measured first temperature and comparing the measured second temperature to an estimated delayed first temperature associated with the expected time delay.Type: ApplicationFiled: April 17, 2017Publication date: August 3, 2017Applicant: Cummins Filtration IP, Inc.Inventors: Carlos Lana, Baohua Qi
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Patent number: 9689297Abstract: A Diesel Particulate Filter (DPF) system including a Venturi exhaust passage device, in which a temperature and a pressure in a high pressure passage are measured, together with a difference of pressures in the high pressure passage and a low pressure passage, while a pressure drop across a DPF is monitored. A PM amount and an exhaust flow rate, which are key parameters in DPF control, can be calculated with the measured values. With the Venturi exhaust passage device, a two-stage bootstrapping heating device with two DOCs and an electrical heater can be further used to heat exhaust gas at a temperature lower than a light-off temperature, while a flow-back passage fluidly connected to an outlet of the DPF can be used for increasing exhaust flow-rate and making PM distribution in the DPF more uniform.Type: GrantFiled: June 4, 2015Date of Patent: June 27, 2017Inventor: Baohua Qi
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Patent number: 9658177Abstract: A system to detect the presence of a catalyst includes an exhaust gas tube, a first temperature sensing device, a second temperature sensing device, a flow rate measurement device, and a processing device. The first temperature sensing device measures a first temperature of exhaust gas upstream of the exhaust gas tube. The second temperature sensing device measures a second temperature of the exhaust gas downstream of the exhaust gas tube. The processing device estimates an expected time delay between the measured inlet and outlet exhaust gas temperatures corresponding to a system with a catalyst present. The processing device may also determine the presence of a catalyst by comparing the measured second temperature to the measured first temperature and comparing the measured second temperature to an estimated delayed first temperature associated with the expected time delay.Type: GrantFiled: February 9, 2016Date of Patent: May 23, 2017Assignee: Cummins Filtration IP, Inc.Inventors: Carlos Lana, Baohua Qi
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Patent number: 9605578Abstract: A PM sensing device including a front sensing piece receiving an exhaust flow, a back sensing piece posited downstream from the front sensing piece, and a sensor controller electrically connected to the sensing pieces for measuring their impedances and calculate a PM sensing value accordingly. The PM sensing device has two operating modes: an impedance measurement mode, in which a PM sensing value is calculated, and a regeneration mode, in which accumulated PM is removed. Since PM is only deposited in the front sensing piece, by comparing impedances of the front and the back sensing pieces, PM sensing values can be obtained insensitive to particle size, exhaust gas temperature, and exhaust gas species. When the PM sensor is positioned in a DPF system, sensor regeneration times in a predetermined period of time after a DPF regeneration completes can be used for triggering a new DPF regeneration and detecting DPF failures.Type: GrantFiled: December 2, 2015Date of Patent: March 28, 2017Inventor: Baohua Qi
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Publication number: 20170022867Abstract: An injector for delivering a working fluid into a working environment is disclosed. According to one embodiment of the present invention, the injector includes a pre-metering chamber with a control valve controlling fluid delivery rate and a swirl chamber, in which a swirling flow is created and atomization is achieved at low injector pressure when it is released. In another embodiment, the injector includes a swirl chamber and an atomization element with a bore, through which a control valve is positioned. The control valve forces a working fluid flow through the atomization element when the injector is energized to create a metered swirling flow. To avoid issues with deteriorated working fluid, a purging apparatus is used for emptying working fluid residue in the injector, and a special control method is used when the injector works in a high-temperature working environment.Type: ApplicationFiled: October 7, 2016Publication date: January 26, 2017Inventor: Baohua Qi
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Patent number: 9546584Abstract: A multi-stage SCR system including a front reductant injecting device, a front mixer, a front SCR catalyst, a back reductant injecting device, a back mixer, a back SCR catalyst, and a DCU. The front and back reductant injecting devices receives reductant from an air-driven pump, which includes a liquid supply tank, a pressure tank, and solenoids control valves. Under pressure provided by a compress air source, reductant is pressed into the front and back reductant injecting devices from the air-driven pump. The front and back reductant devices also have flow-back paths fluidly connected to a reductant tank. And in purging or maintenance heating, the flow-back paths can be energized open. In the multi-stage SCR system, a DOC can be further positioned in between the two SCR devices for increasing the deNOx efficiency in the back SCR catalyst, so that the system is less sensitive to catalyst aging.Type: GrantFiled: August 19, 2014Date of Patent: January 17, 2017Inventor: Baohua Qi
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Patent number: 9488086Abstract: An injector for delivering a working fluid into a working environment is disclosed. According to one embodiment of the present invention, the injector includes a pre-metering chamber and a swirl chamber. A high velocity partially atomized flow is produced in the pre-metering chamber through a first exit nozzle after impinging on an atomization element, and then a swirling flow is created in the swirl chamber with the atomization element. When the swirling flow is released through a second exit nozzle, atomization can be achieved at low injector pressure with centrifugal force and shearing of the working fluid. In another embodiment, the injector includes a swirl chamber and an atomization element with a bore, through which a control valve is positioned. The control valve forces a working fluid flow through the atomization element when the injector is energized to create a swirling flow. No flow-back is required for the injectors.Type: GrantFiled: December 10, 2014Date of Patent: November 8, 2016Inventor: Baohua Qi
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Publication number: 20160281569Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.Type: ApplicationFiled: June 8, 2016Publication date: September 29, 2016Inventors: Xi Wei, David Samuel Everard, Baohua Qi, Mickey R. McDaniel, Edmund P. Hodzen, Guoquian Li
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Publication number: 20160236846Abstract: Devices for labeling and discharging a contaminated fluid, and discharging a contaminant to prevent a contaminated fluid from being used. In an embodiment, a discharging device includes a wax sealing an aperture at the bottom of a water bottle. The wax melts at a high temperature which may cause the water in the bottle contaminated, releasing the water from the water bottle. In another embodiment, a discharging device including an aperture in a DEF tank and a seal material sealing the aperture is used to discharge mistakenly filled contaminant, which dissolves the seal material. In another embodiment, a labeling device including an ink sealed in a wax wrapper is disclosed. The wax wrapper melts at high temperature, releasing the ink and labeling a fluid as problematic. By using a conductive ink with a non-conductive fluid, the labeling device can also be used for detecting and recording high temperature events.Type: ApplicationFiled: February 17, 2016Publication date: August 18, 2016Inventors: Baohua Qi, Jeffrey Yan Key
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Patent number: 9382828Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.Type: GrantFiled: October 7, 2013Date of Patent: July 5, 2016Assignee: Cummins Emission Solutions Inc.Inventors: Xi Wei, David Everard, Baohua Qi, Mickey R. McDaniel, Edmund P. Hodzen, Guoquiang Li