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    Induction diagnostics for skip fire engines
    35.
    发明授权
    Induction diagnostics for skip fire engines 有权

    公开(公告)号：US09891137B2

    公开(公告)日：2018-02-13

    申请号：US15641097

    申请日：2017-07-03

    Applicant: Tula Technology, Inc.

    Inventor： Shikui Kevin Chen ,  Allan J. Kotwicki ,  Joel D. Van Ess ,  Robert S. Bailey ,  Mohammad R. Pirjaberi

    IPC: G01M15/05 ,  F02M35/10 ,  G01M15/09

    CPC classification number: G01M15/05 ,  F02M35/1038 ,  G01M15/09

    Abstract: A variety of methods and arrangements for detecting failure of the commanded air induction in an internal combustion engine are described. In some embodiments, the intake manifold pressure is monitored. An air induction event generates a fluctuation in the intake manifold pressure, which is recorded. The signal is processed through a diagnostic filter to help determine whether the actual induction matched the commanded induction. In other embodiments, measured crankshaft acceleration is compared with estimated crankshaft acceleration. If the two quantities differ by a threshold amount an induction fault is detected. The two detection methods may also be combined. The describe approaches are particularly well suited for use in engines operating in a skip fire mode with cylinder deactivation and/or a dynamic firing level modulation mode.

    Engine braking controller
    39.
    发明授权
    Engine braking controller 有权
    发动机制动控制器

    公开(公告)号：US09328672B2

    公开(公告)日：2016-05-03

    申请号：US13953615

    申请日：2013-07-29

    Applicant: Tula Technology, Inc.

    Inventor： Louis J. Serrano ,  Steven E. Carlson ,  Joshua P. Switkes ,  Ronald D. Yuille

    IPC: F02D13/04 ,  F02D41/00 ,  F02D17/02 ,  F02D41/12 ,  F02D13/02

    CPC classification number: F02D17/02 ,  F02D13/0203 ,  F02D13/04 ,  F02D41/0005 ,  F02D41/0087 ,  F02D41/123

    Abstract: In one aspect of the invention, an engine is operated in a skip cylinder engine braking mode. In the skip cylinder engine braking mode, selected working cycles of selected working chambers are deactivated. Other selected working cycles of the selected working chambers are operated in a braking mode. Accordingly, individual working chambers are sometimes deactivated and sometimes operated in the braking mode while the engine is operating in the skip cylinder engine braking mode. Various methods for cylinder control are described, which improve fuel economy, catalytic converter performance, and vehicle NVH characteristics.

    Abstract translation: 在本发明的一个方面，发动机以跳过气缸发动机制动模式操作。 在跳过气缸发动机制动模式下，所选择的工作室的选定工作循环被停用。 所选择的工作室的其他选定的工作循环在制动模式下操作。 因此，当发动机以跳过气缸发动机制动模式运行时，单个工作室有时被停用并且有时在制动模式下操作。 描述了用于气缸控制的各种方法，其提高燃料经济性，催化转化器性能和车辆NVH特性。

    Cam phaser control
    40.
    发明授权
    Cam phaser control 有权
    凸轮移相器控制

    公开(公告)号：US09291106B2

    公开(公告)日：2016-03-22

    申请号：US13842234

    申请日：2013-03-15

    Applicant: Tula Technology, Inc.

    Inventor： Joshua P. Switkes ,  Xin Yuan ,  Matthew A. Younkins

    IPC: F02D13/02 ,  F02D13/06 ,  F02D41/00 ,  F01L1/344 ,  F01L13/00

    CPC classification number: F02D13/0219 ,  F01L1/344 ,  F01L1/34409 ,  F01L2013/001 ,  F01L2800/00 ,  F01L2800/15 ,  F01L2820/01 ,  F02D13/06 ,  F02D41/0087 ,  F02D2041/001 ,  F02D2041/0012 ,  Y02T10/18

    Abstract: Arrangements for stabilizing valve timing adjustment mechanisms such as cam phasers during operation of an engine are described. The described approaches are particularly well suited for use during skip fire control, although they may be used advantageously in other applications as well. In general, the phase of an adjustable phase camshaft is controlled relative to a crankshaft of an engine. In one aspect, at least one of (i) firing events in a skip fire firing sequence, and (ii) dynamically determined valve actuation events are used in the control of the camshaft phase during operation of the engine. In some embodiments, hydraulic pressure within a cam phaser is varied in a manner that maintains the phase of the camshaft substantially more stable through transitory variations in torque applied to the camshaft by the actuation of the valves than would occur without the variations in hydraulic pressure.

    Abstract translation: 描述了在发动机运行期间稳定气门正时调节机构（例如凸轮相位器）的布置。 所描述的方法特别适用于跳过火控制期间的使用，尽管它们也可有利地用于其它应用中。 通常，相对于发动机的曲轴控制可调节相位凸轮轴的相位。 在一个方面中，在发动机运转期间，在（i）点火点火顺序中的点火事件和（ii）动态确定的气门致动事件中的至少一个被用于控制凸轮轴相位。 在一些实施例中，凸轮相位器内的液压变化的方式是通过阀的致动而不会在没有液压变化的情况下施加到凸轮轴上的扭矩的瞬时变化来保持凸轮轴的相位的稳定。

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