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公开(公告)号：US11913401B1
公开(公告)日：2024-02-27
申请号：US18309984
申请日：2023-05-01
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Vijay A Ramappan , Rafat F Hattar , Jeffrey M Kaiser , Joseph Shelton
CPC classification number: F02D9/04 , F01N3/20 , F02D41/042 , F02D41/064 , F02D41/123 , F01N2430/10 , F02D2200/0802
Abstract: An engine consumes fuel and air to generate an exhaust gas stream. An exhaust system channels the exhaust gas stream from the engine to a tailpipe. An aftertreatment system is included in the exhaust system and includes a catalyst. An exhaust throttle valve is disposed in the exhaust system downstream from the aftertreatment system. An actuator controls an amount of air pumped through the engine. A controller operates the exhaust throttle valve and/or the actuator to control emissions from the exhaust system during a cold start and following a deceleration fuel cutoff event.
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公开(公告)号：US12247504B1
公开(公告)日：2025-03-11
申请号：US18470835
申请日：2023-09-20
Applicant: GM Global Technology Operations LLC
Inventor： Chengke Liu , Rafat F. Hattar , Janean Ellen Potter , Erika L Pruski
Abstract: An exhaust system comprises an engine, a three-way catalytic converter including a first catalyst and a second catalyst, a tailpipe adjacent to the three-way catalytic converter, a first oxygen sensor disposed between the engine and the catalytic converter, a nitrogen oxides (NOx) sensor disposed in the three-way catalytic converter, and an engine control module (ECM) configured to obtain first oxygen sensor data from the first oxygen sensor, second oxygen sensor data from the NOx sensor, and NOx sensor data from the NOx sensor, the ECM being configured to perform catalyst health diagnostic operations and adjust one or more characteristics of the exhaust system based on at least the first oxygen sensor data, the second oxygen sensor data, and the NOx sensor data.
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公开(公告)号：US20250137413A1
公开(公告)日：2025-05-01
申请号：US18500018
申请日：2023-11-01
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Rafat F. Hattar , John Michael Ellenberger , Vijay A. Ramappan , Andrew B. Gillett
IPC: F02D41/00
Abstract: Methods for operating internal combustion engines and methods for controlling intake air temperature in engines of vehicles are provided. An engine includes an intake system configured to deliver intake air to the internal combustion engine; an exhaust system configured to discharge exhaust gas from the internal combustion engine; and an exhaust gas recirculation (“EGR”) system configured to selectively deliver a portion of the exhaust gas to the intake system. The internal combustion engine is located in an underhood zone; the intake system includes a first intake pipe having an outlet in communication with the intake system and having an inlet located outside of the underhood zone to receive ambient air; and the intake system includes a second intake pipe having an outlet in communication with the intake system and having an inlet located within the underhood zone to receive air warmed by the internal combustion engine.
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Patent Agency Ranking
公开(公告)号：US11788455B1
公开(公告)日：2023-10-17
申请号：US18055437
申请日：2022-11-15
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Rafat F. Hattar
CPC classification number: F01N13/08 , B01D53/9495 , F01N9/00 , F01N2900/1404 , F01N2900/1602
Abstract: Methods and systems are provided for recirculation of an engine exhaust gas. The system includes an engine, an exhaust system configured to channel exhaust gas from the engine to an outlet, an aftertreatment device, an exhaust recirculation system configured to divert at least some of the exhaust gas as recirculated exhaust gas from a first position in the exhaust system downstream of the aftertreatment device, through a buffer tank, and to a second position in the exhaust system upstream of the aftertreatment device, wherein the recirculated exhaust gas is combined with the exhaust gas at the second position, a controller configured to, by a processor, selectively operate the exhaust recirculation system to control the exhaust recirculation system to divert the exhaust gas and thereby cause the recirculated exhaust gas to be treated with the aftertreatment device more than once with sequentially increased catalyst temperatures.
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公开(公告)号：US20250092814A1
公开(公告)日：2025-03-20
申请号：US18470835
申请日：2023-09-20
Applicant: GM Global Technology Operations LLC
Inventor： Chengke Liu , Rafat F. Hattar , Janean Ellen Potter , Erika L. Pruski
Abstract: An exhaust system comprises an engine, a three-way catalytic converter including a first catalyst and a second catalyst, a tailpipe adjacent to the three-way catalytic converter, a first oxygen sensor disposed between the engine and the catalytic converter, a nitrogen oxides (NOx) sensor disposed in the three-way catalytic converter, and an engine control module (ECM) configured to obtain first oxygen sensor data from the first oxygen sensor, second oxygen sensor data from the NOx sensor, and NOx sensor data from the NOx sensor, the ECM being configured to perform catalyst health diagnostic operations and adjust one or more characteristics of the exhaust system based on at least the first oxygen sensor data, the second oxygen sensor data, and the NOx sensor data.
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公开(公告)号：US11725601B1
公开(公告)日：2023-08-15
申请号：US17937799
申请日：2022-10-04
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Rafat F. Hattar
CPC classification number: F02D41/0072 , F01N3/2006 , F01N2260/08 , F02D2200/0802 , F02D2200/1002
Abstract: Methods and systems are provided for recirculation of an engine exhaust gas. The system includes an engine, an exhaust system configured to channel exhaust gas from the engine to an outlet, an aftertreatment device, an exhaust recirculation system configured to divert at least some of the exhaust gas as recirculated exhaust gas from a first position in the exhaust system downstream of the aftertreatment device, through a housing enclosing the aftertreatment device, and to a second position in the exhaust system upstream of the aftertreatment device, wherein the recirculated exhaust gas is combined with the exhaust gas at the second position, a controller configured to, by a processor, selectively operate the exhaust recirculation system to control the exhaust recirculation system to divert the exhaust gas and thereby cause the recirculated exhaust gas to be treated with the aftertreatment device more than once.
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7.发明授权公开(公告)号：US11629625B1
公开(公告)日：2023-04-18
申请号：US17810720
申请日：2022-07-05
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Rafat F Hattar , John Michael Ellenberger , Philipp A Seyfried
Abstract: Engine systems and methods use a dual air injection approach to control exhaust reactions and to maintain temperatures below a maximum limit of exhaust system components during engine enrichment operation conditions. Dual air injectors are disposed in the exhaust system with one upstream from, and another downstream from, the catalytic converter. Providing air injection before and/or after the converter helps convert all HC, CO, and PM emissions while keeping the catalyst temperature below the catalyst protection temperature limit. Air injection quantity may be controlled and diagnosed by monitoring the temperatures before and after the catalytic converter. The catalytic converter may be a three-way catalytic converter for lower cost or a downstream two-way catalytic converter may be added if further emission reduction is necessary.
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公开(公告)号：US11519317B1
公开(公告)日：2022-12-06
申请号：US17649840
申请日：2022-02-03
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Chengke Liu , Rafat F Hattar
Abstract: Engine systems use a three-way catalyst followed by air injection and mixing to convert all hydrocarbons and carbon monoxide under various load conditions when exhaust gas temperature is above 500 degrees Celsius. A three-way catalytic converter is disposed in the exhaust system. A nozzle is configured to inject air into the exhaust system downstream from the three-way catalytic converter. A mixing plate with or without catalyst coatings is disposed in the exhaust system downstream from the nozzle. The mixing plate is bow shaped with a concave shaped side facing the nozzle to enhance carbon monoxide conversion. Optional two way catalytic converters are added downstream from the mixing plate to further reduce tailpipe hydrocarbon and carbon monoxide emissions.
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