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6 条记录 (耗时 0.012 秒)

    Method and system for valve movement detection
    1.
    发明授权
    Method and system for valve movement detection 有权

    公开(公告)号：US11230990B2

    公开(公告)日：2022-01-25

    申请号：US16680247

    申请日：2019-11-11

    申请人： Caterpillar Inc.

    发明人： Daniel R. Puckett ,  Kranti K. Nellutla ,  Gregory L. Armstrong

    IPC分类号： F02D41/38 ,  F02D41/20 ,  F02D41/14 ,  F02M63/00 ,  F02M45/00

    摘要： A fuel injection method includes applying a first method current to close a spill valve according to a first method, applying a control valve current to open a control valve, and discontinuing the application of the control valve current to thereby cause the control valve to close. The method also includes applying a second method current to maintain the spill valve closed according to a second method and detecting a timing of a closing of the control valve while applying the second method current according to the second method, the second method being different than the first method.

    Method and system for monitoring injector valves
    4.
    发明授权
    Method and system for monitoring injector valves 有权

    公开(公告)号：US11313338B1

    公开(公告)日：2022-04-26

    申请号：US16953900

    申请日：2020-11-20

    申请人： Caterpillar Inc.

    发明人： Andrew O. Marrack ,  Daniel R. Puckett ,  Kranti K. Nellutla ,  Dustin K. Fee

    IPC分类号： F02M61/04 ,  F02M51/06 ,  F02D41/34 ,  F02D41/20

    摘要： A method for controlling a fuel injector includes applying a spill valve current, applying a control valve current, the control and spill valves including components in electrical communication with each other, and detecting a timing at which the spill valve returns to an open position based on induced spill valve current. The method includes detecting a timing at which the control valve returns to a resting position based on induced control valve current, the induced spill valve current and the induced control valve current being included in respective freewheeling currents that at least partially overlap each other, adjusting a spill valve current that is applied during an injection, based on the detected spill valve return timing, and adjusting a control valve current that is applied during the injection, based on the detected control valve return timing.

    Fuel apportionment strategy for in-cylinder dosing
    5.
    发明授权
    Fuel apportionment strategy for in-cylinder dosing 有权

    公开(公告)号：US10794251B2

    公开(公告)日：2020-10-06

    申请号：US15273264

    申请日：2016-09-22

    申请人： Caterpillar Inc.

    发明人： James S. Ulstad ,  Kranti K. Nellutla ,  Greg L. Armstrong ,  Steven Y. Tian ,  Brian P. Brennan ,  Sasidhar Rayasam ,  Anand KrishnamurthyGopalan

    IPC分类号： F01N3/20 ,  F02D41/40 ,  F01N3/023 ,  F01N9/00 ,  F02D41/02

    摘要： An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.