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    Method to improve combustion stability in a controlled auto-ignition combustion engine
    3.
    发明授权
    Method to improve combustion stability in a controlled auto-ignition combustion engine 有权
    改善受控自动点火内燃机燃烧稳定性的方法

    公开(公告)号：US07802553B2

    公开(公告)日：2010-09-28

    申请号：US11399640

    申请日：2006-04-06

    申请人： Paul M. Najt ,  Tang-Wei Kuo ,  James A. Eng ,  Rodney B. Rask

    发明人： Paul M. Najt ,  Tang-Wei Kuo ,  James A. Eng ,  Rodney B. Rask

    IPC分类号： F02B51/02

    CPC分类号： F02F3/14 ,  F01L3/04 ,  F01L2101/02 ,  F01L2103/00 ,  F02B1/12 ,  F02B77/02 ,  F05C2251/04 ,  F05C2251/048 ,  Y02T10/128

    摘要： A method to control combustion in an HCCI engine, to mitigate effects of combustion chamber deposits is detailed. The method comprises applying a specific surface coating to a combustion chamber surface. The surface coating has thermal properties substantially similar to the combustion chamber deposits. The thermal properties preferably include a) thermal conductivity, b) heat capacity, and c) thermal diffusivity. Applying a surface coating results in a reduction of combustion variability due to variation in combustion chamber deposits, and an improvement on combustion stability at low loads due to reduced heat loss. A preferred thermally insulating surface coating includes thermal parameters of a heat capacity in a range of 0.03×106 J/m3-K to 2.0×106 J/m3-K; a thermal conductivity in a range of 0.25 W/m-K to 2.5 W/m-K; and, a thermal diffusivity in a range of 1×10−7 m2/s to 8×10−6 m2/s.

    摘要翻译： 详细描述了一种控制HCCI发动机燃烧的方法，以减轻燃烧室沉积物的影响。 该方法包括将特定的表面涂层施加到燃烧室表面。 表面涂层具有与燃烧室沉积物基本相似的热性质。 热性质优选包括a）热导率，b）热容量，和c）热扩散率。 施加表面涂层导致由于燃烧室沉积物的变化而导致的燃烧变异性的降低，以及由于热损失减少而在低负载下的燃烧稳定性的改善。 优选的绝热表面涂层包括在0.03×10 6 J / m 3 -K至2.0×10 6 J / m 3 -K范围内的热容的热参数; 在0.25W / m-K至2.5W / m-K的范围内的热导率; 并且在1×10 -7 m 2 / s至8×10 -6 m 2 / s的范围内的热扩散率。

    Method for transition between controlled auto-ignition and spark ignition modes in direct fuel injection engines
    5.
    发明授权
    Method for transition between controlled auto-ignition and spark ignition modes in direct fuel injection engines 有权
    直喷式发动机控制自动点火和火花点火模式之间转换的方法

    公开(公告)号：US07370616B2

    公开(公告)日：2008-05-13

    申请号：US11367045

    申请日：2006-03-02

    申请人： Tang-Wei Kuo ,  Zongxuan Sun ,  Jun-Mo Kang ,  James A. Eng ,  Chen-Fang Chang ,  Barry L. Brown ,  Paul M. Najt ,  Man-Feng Chang

    发明人： Tang-Wei Kuo ,  Zongxuan Sun ,  Jun-Mo Kang ,  James A. Eng ,  Chen-Fang Chang ,  Barry L. Brown ,  Paul M. Najt ,  Man-Feng Chang

    IPC分类号： F02B17/00 ,  F02B5/00 ,  F02M25/07 ,  F01L1/34

    CPC分类号： F01L1/344 ,  F01L13/0015 ,  F02B1/12 ,  F02B17/005 ,  F02D11/10 ,  F02D13/0207 ,  F02D13/0219 ,  F02D13/0265 ,  F02D41/005 ,  F02D41/3035 ,  F02D41/3064 ,  F02D41/402 ,  F02D2041/001 ,  Y02T10/128 ,  Y02T10/18 ,  Y02T10/42

    摘要： A method is provided for control of transition between combustion modes of a direct-injection engine operable in a homogeneous charge compression ignition (HCCI) mode at lower loads and a spark ignition flame propagation (SI) mode at higher loads. The engine includes a variable valve actuation system including two-step high and low lift valve actuation and separate cam phasing for both intake and exhaust valves. The method includes operating the engine at steady state, with fuel-air-exhaust gas mixtures at predetermined conditions, for each speed and load, and controlling the engine during mode changes between the HCCI mode and the SI mode by switching the exhaust and intake valves between low lift for HCCI operation and high lift for SI operation. High load may be an SI throttled mode with an intermediate unthrottled mode (SI/NTLC} in which transition between HCCI and SI/NTLC modes requires switching only the exhaust valve lift and transition between SI/NTLC and SI throttled modes requires switching only the intake valve lift, with predetermined phase adjustments in the valve timing phasing.

    摘要翻译： 提供了一种用于控制在较低负载下以均质充气压缩点火（HCCI）模式操作的直喷式发动机的燃烧模式之间的过渡和在较高负载下的火花点火火焰传播（SI）模式下的过渡的方法。 发动机包括可变气门驱动系统，其包括两步高和低升程气门致动以及用于进气门和排气门的单独的凸轮定相。 该方法包括：对于每个速度和负载，在预定条件下以稳定状态操作发动机，并且在HCCI模式和SI模式之间的模式转换期间通过切换排气和进气门来控制发动机 在HCCI操作的低电梯和SI操作的高电梯之间。 高负载可能是具有中间非节流模式（SI / NTLC）的SI节流模式，其中HCCI和SI / NTLC模式之间的转换只需要切换排气门升程，SI / NTLC和SI节流模式之间的转换只需要切换进气 气门升程，在气门正时相定相调整。

    Method and apparatus to control operation of a homogeneous charge compression-ignition engine
    7.
    发明授权
    Method and apparatus to control operation of a homogeneous charge compression-ignition engine 有权
    控制均质充气压缩点火发动机运行的方法和装置

    公开(公告)号：US07360523B2

    公开(公告)日：2008-04-22

    申请号：US11749903

    申请日：2007-05-17

    申请人： Thompson M. Sloane ,  Tang-Wei Kuo ,  Jun-Mo Kang ,  Paul M. Najt

    发明人： Thompson M. Sloane ,  Tang-Wei Kuo ,  Jun-Mo Kang ,  Paul M. Najt

    IPC分类号： F02B1/10 ,  F02B1/14 ,  F02M25/07 ,  F01L1/34

    CPC分类号： F02B17/005 ,  F01L1/185 ,  F01L1/34 ,  F01L13/0015 ,  F01L2001/0537 ,  F01L2105/00 ,  F01L2820/01 ,  F02D13/0265 ,  F02D41/0052 ,  F02D41/006 ,  F02D41/3035 ,  F02D41/3064 ,  F02D41/402 ,  F02D2200/703 ,  Y02T10/128 ,  Y02T10/44

    摘要： The invention provides a method for operating a multi-cylinder, spark-ignition, direct-injection, four-stroke internal-combustion engine adapted to operate in a controlled auto-ignition mode selectively operative at stoichiometry and lean of stoichiometry. The method comprises adapting an engine valve actuation system to control engine valve opening and closing, and monitoring engine operating conditions and ambient barometric pressure. The engine is operated unthrottled and the engine valve actuation system is controlled to effect a negative valve overlap period when the engine operating conditions are within predetermined ranges. A mass of fuel is injected during the negative valve overlap period. The magnitude of the negative valve overlap period is decreased with decreasing ambient pressure and increased with increasing ambient pressure.

    摘要翻译： 本发明提供一种用于操作多气缸，火花点火，直接喷射四冲程内燃机的方法，其适于以控制的自动点火模式操作，其选择性地以化学计量学和化学计量学的方式操作。 该方法包括调整发动机气门致动系统以控制发动机气门的打开和关闭，以及监测发动机运行状况和环境气压。 发动机被无节流地操作，并且当发动机操作条件在预定范围内时，发动机气门致动系统被控制以实现负阀重叠时段。 在负阀重叠期间，燃料的质量被注入。 负气门重叠周期的大小随着环境压力的降低而降低，随环境压力的增加而增加。

    Method and apparatus to operate a homogeneous charge compression-ignition engine
    9.
    发明授权
    Method and apparatus to operate a homogeneous charge compression-ignition engine 有权
    操作均质充气压缩点火发动机的方法和装置

    公开(公告)号：US07246597B2

    公开(公告)日：2007-07-24

    申请号：US11398776

    申请日：2006-04-06

    申请人： Tang-Wei Kuo ,  Paul M. Najt ,  James A. Eng ,  Rodney B. Rask

    发明人： Tang-Wei Kuo ,  Paul M. Najt ,  James A. Eng ,  Rodney B. Rask

    IPC分类号： F02B9/04

    CPC分类号： F02D41/3035 ,  F02B1/12 ,  F02B23/0672 ,  F02D13/0234 ,  F02D35/02 ,  F02D35/028 ,  F02D41/005 ,  F02D41/1467 ,  F02D2041/001 ,  Y02T10/125 ,  Y02T10/128 ,  Y02T10/18

    摘要： A method and apparatus for controlling engine operation to compensate for effects of combustion chamber deposits (CCDs) on combustion in a controlled auto-ignition engine is presented. Control methodologies comprise operation of variable valve actuation, fuel injection, spark timing, and intake air and coolant temperature to dynamically compensate for the effect of CCDs. A sensitivity to core gas temperature and chamber wall thermal conditions is shown, which is correlatable to in-cylinder CCD formation. Intake charge or coolant temperature control can be used to compensate for CCD effects. An engine control scheme relies upon a parametric input that quantifies instantaneous CCD formation in the combustion chamber. The result is further applicable to control pre-ignition in a conventional spark-ignition engine.

    摘要翻译： 提出了一种用于控制发动机操作以补偿燃烧室沉积物（CCD）对受控自动点火发动机燃烧的影响的方法和装置。 控制方法包括可变阀致动，燃料喷射，火花正时以及进气和冷却剂温度的操作，以动态补偿CCD的影响。 显示了对核心气体温度和室壁热条件的敏感性，这与缸内CCD形成有关。 进气充液或冷却液温度控制可用于补偿CCD效应。 发动机控制方案依赖于量化燃烧室中瞬时CCD形成的参数输入。 结果进一步适用于在常规火花点火发动机中控制预点火。