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公开(公告)号：US10323586B1
公开(公告)日：2019-06-18
申请号：US15848204
申请日：2017-12-20
Applicant: Caterpillar Inc.
Inventor： Nathan Atterberry , Matthew Jordan Engfehr , Hua Xu
CPC classification number: F02D41/0027 , F02D35/023 , F02D41/222 , F02D41/26 , F02D2041/224
Abstract: A dual fuel engine control system includes a pressure sensor, and an electronic control unit coupled with the pressure sensor and structured to receive cylinder pressure data indicative of cylinder over-pressurization, and to switch the system to a limited gas-to-liquid substitution mode based on the cylinder pressure data indicative of cylinder over-pressurization. The electronic control unit is further structured to return the system to a normal gas-to-liquid substitution mode, receive cylinder pressure data indicative of cylinder over-pressurization after returning the system to the normal gas-to-liquid substitution mode, and responsively output a gas substitution fault signal.
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公开(公告)号：US20250083565A1
公开(公告)日：2025-03-13
申请号：US18244464
申请日：2023-09-11
Applicant: Caterpillar Inc.
Inventor： Srikar Thaduvayi , Hua Xu , Justin Dale Middleton
Abstract: Various techniques to maintain the same state of charge levels between multiple battery strings, manage battery string usage during machine idle/low power conditions, and manage the usage of battery strings with insufficient state of charge level.
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公开(公告)号：US20190242307A1
公开(公告)日：2019-08-08
申请号：US15888126
申请日：2018-02-05
Applicant: Caterpillar Inc.
Inventor： Matthew J. Engfehr , Nathan P. Atterberry , Hua Xu
CPC classification number: F02D19/0623 , F02D19/0605 , F02D19/0615 , F02D19/0628 , F02D19/0642 , F02D19/0665 , F02D19/0681 , F02M35/1038
Abstract: A method for determining failure of an electromechanically actuated gas shut off valve includes sensing and recording a gas fuel rail pressure and a boost pressure from an air intake manifold at a first time after the dual fuel engine has been started. The method includes opening the gas shut off valve at a second time, holding the gas shut off valve in its open state, and then closing the gas shut off valve after a predetermined interval at a third time. The method includes comparing an actual gas rail pressure decay rate to a threshold gas rail pressure decay rate for the predetermined interval, and determining failure of the gas shut off valve when the actual gas rail pressure decay rate is less than the threshold gas rail pressure decay rate. Upon determining failure of the gas shut off valve, the method also includes initiating a mitigating action.
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公开(公告)号：US20190040804A1
公开(公告)日：2019-02-07
申请号：US15665842
申请日：2017-08-01
Applicant: Caterpillar Inc.
Inventor： Nathan Atterberry , Matthew Engfehr , Hua Xu
Abstract: A dual fuel engine system, such as for diesel and natural gas operation, includes a control system having an electronic control unit structured to vary a stored control valve for a fuel delivery parameter, responsive to engine power output. The engine power output can be determined by in-cylinder pressure monitoring during a liquid fuel mode. The stored control value can be a dynamically updated value in an engine fueling map.
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公开(公告)号：US20180223745A1
公开(公告)日：2018-08-09
申请号：US15423905
申请日：2017-02-03
Applicant: Caterpillar Inc.
Inventor： Nathan Atterberry , Matthew Jordan Engfehr , Hua Xu
CPC classification number: F02D19/081 , F02D19/0647 , F02D41/0025 , F02D41/0027 , F02D41/0082 , F02D41/0087 , F02D2250/21 , Y02T10/36
Abstract: An engine control system includes a dual fuel internal combustion engine, a fuel system including a liquid fuel source and a gaseous fuel source, and a controller. The engine control system further includes a liquid fuel control module and at least one gaseous fuel control module associated with a first and second subset of cylinders, each communicatively connected over a network. The controller has an operating mode and a cylinder deactivation mode. The controller in the operating mode is configured to instruct the liquid fuel control module and the at least one gaseous fuel control module to operate the plurality of cylinders in a dual fuel mode. The controller in the cylinder deactivation mode transitions the plurality of cylinders to a liquid-fuel only mode over a phase out period, deactivates the first subset of cylinders, and then transitions to the dual fuel mode in the second subset of cylinders.
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Patent Agency Ranking
公开(公告)号：US20190186391A1
公开(公告)日：2019-06-20
申请号：US15848204
申请日：2017-12-20
Applicant: Caterpillar Inc.
Inventor： Nathan Atterberry , Matthew Jordan Engfehr , Hua Xu
CPC classification number: F02D41/0027 , F02D35/023 , F02D41/222 , F02D41/26 , F02D2041/224
Abstract: A dual fuel engine control system includes a pressure sensor, and an electronic control unit coupled with the pressure sensor and structured to receive cylinder pressure data indicative of cylinder over-pressurization, and to switch the system to a limited gas-to-liquid substitution mode based on the cylinder pressure data indicative of cylinder over-pressurization. The electronic control unit is further structured to return the system to a normal gas-to-liquid substitution mode, receive cylinder pressure data indicative of cylinder over-pressurization after returning the system to the normal gas-to-liquid substitution mode, and responsively output a gas substitution fault signal.
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公开(公告)号：US20180073452A1
公开(公告)日：2018-03-15
申请号：US15263945
申请日：2016-09-13
Applicant: Caterpillar Inc.
Inventor： Michael D. Gough , Nathan Atterberry , Jeff Howard , Brian Bell , Hua Xu
CPC classification number: F02D41/0027 , F02B3/12 , F02B37/00 , F02B43/00 , F02B43/12 , F02B63/04 , F02D19/0647 , F02D35/023 , F02D41/0007 , F02D41/0025 , F02D41/1446 , F02D41/401 , F02D2041/389 , F02D2200/04 , F02D2200/0602
Abstract: A system and method for automatically calibrating an engine operating with a first fuel and a second fuel includes comparing each of a plurality of engine operating parameters with a corresponding limit, determining whether any of the plurality of engine operating parameters has exceeded its corresponding limit and, while none of the plurality of engine operating parameters has exceeded its corresponding limit, automatically and incrementally advance start of injection timing.
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公开(公告)号：US20160252036A1
公开(公告)日：2016-09-01
申请号：US15150751
申请日：2016-05-10
Applicant: Caterpillar Inc.
Inventor： Hua Xu , Arvind Sivasubramanian , Shaun D. Fogle , David J. Lin
CPC classification number: F02D41/1475 , F02D41/1463 , F02D2041/281 , F02D2041/286
Abstract: The disclosure provides a method to operate an engine system. The method begins by determination of a current NOx value. If the current NOx value is greater than a first predetermined NOx target, an air-fuel ratio (AFR) set-point is adjusted by a first predetermined value in towards a rich AFR. Upon detection of the current NOx value below the first predetermined NOx target, a first average of NOx values for a first predetermined time is determined. The AFR set-point is adjusted by a second predetermined value and a second average of NOx values for a second predetermined time is determined. A delta NOx value is determined as a difference between the first average and the second average and compared with a second predetermined NOx target. The AFR set-point is determined when the delta NOx value is below the second predetermined NOx target.
Abstract translation: 本公开提供了一种操作发动机系统的方法。 该方法通过确定当前的NOx值开始。 如果当前的NOx值大于第一规定的NOx目标，则将空燃比（AFR）设定点向着浓AFR调整第一预定值。 当检测到当前NOx值低于第一预定NOx目标值时，确定第一预定时间的NOx值的第一平均值。 AFR设定点被调整第二预定值，并确定第二预定时间的NOx值的第二平均值。 Δδ值被确定为第一平均值和第二平均值之差，并与第二预定NOx目标进行比较。 当ΔNOX值低于第二预定NOx靶时，确定AFR设定点。
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公开(公告)号：US11105278B2
公开(公告)日：2021-08-31
申请号：US15423905
申请日：2017-02-03
Applicant: Caterpillar Inc.
Inventor： Nathan Atterberry , Matthew Jordan Engfehr , Hua Xu
Abstract: An engine control system includes a dual fuel internal combustion engine, a fuel system including a liquid fuel source and a gaseous fuel source, and a controller. The engine control system further includes a liquid fuel control module and at least one gaseous fuel control module associated with a first and second subset of cylinders, each communicatively connected over a network. The controller has an operating mode and a cylinder deactivation mode. The controller in the operating mode is configured to instruct the liquid fuel control module and the at least one gaseous fuel control module to operate the plurality of cylinders in a dual fuel mode. The controller in the cylinder deactivation mode transitions the plurality of cylinders to a liquid-fuel only mode over a phase out period, deactivates the first subset of cylinders, and then transitions to the dual fuel mode in the second subset of cylinders.
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公开(公告)号：US10934948B2
公开(公告)日：2021-03-02
申请号：US15888126
申请日：2018-02-05
Applicant: Caterpillar Inc.
Inventor： Matthew J. Engfehr , Nathan P. Atterberry , Hua Xu
Abstract: A method for determining failure of an electromechanically actuated gas shut off valve includes sensing and recording a gas fuel rail pressure and a boost pressure from an air intake manifold at a first time after the dual fuel engine has been started. The method includes opening the gas shut off valve at a second time, holding the gas shut off valve in its open state, and then closing the gas shut off valve after a predetermined interval at a third time. The method includes comparing an actual gas rail pressure decay rate to a threshold gas rail pressure decay rate for the predetermined interval, and determining failure of the gas shut off valve when the actual gas rail pressure decay rate is less than the threshold gas rail pressure decay rate. Upon determining failure of the gas shut off valve, the method also includes initiating a mitigating action.
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