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    Fuel control compensation for secondary air system flow variation
    23.
    发明授权
    Fuel control compensation for secondary air system flow variation 有权

    公开(公告)号：US07111454B2

    公开(公告)日：2006-09-26

    申请号：US10918581

    申请日：2004-08-13

    Applicant: Stephen K. Fulcher ,  Richard B. Jess ,  Patrick L. Risse ,  Stuart R. Smith ,  James A. Eng

    Inventor： Stephen K. Fulcher ,  Richard B. Jess ,  Patrick L. Risse ,  Stuart R. Smith ,  James A. Eng

    IPC: F01N3/00

    CPC classification number: F02D21/10

    Abstract: An engine control system and method maintains an optimum exhaust fuel to air ratio in an internal combustion engine. A secondary air injection (SAI) pressure is measured in an SAI system. The SAI pressure measurement is converted into an SAI flow value. A fuel compensation value is obtained based on the SAI flow value. Fuel delivery is compensated to the engine based on the fuel compensation value. In a second embodiment, the fuel compensation value is obtained based on the SAI pressure measurement. Fuel delivery is compensated to the engine based on the fuel compensation value. In a third embodiment, a primary flow value is calculated at an air intake of the engine. A fuel compensation value is calculated based on the SAI flow and primary flow values. Fuel delivery to the engine is compensated based on the fuel compensation value.

    Valve and fueling strategy for operating a controlled auto-ignition four-stroke internal combustion engine
    24.
    发明授权
    Valve and fueling strategy for operating a controlled auto-ignition four-stroke internal combustion engine 有权
    用于操作受控自动点火四冲程内燃机的阀和加油策略

    公开(公告)号：US07021277B2

    公开(公告)日：2006-04-04

    申请号：US10899456

    申请日：2004-07-26

    Applicant: Tang-Wei Kuo ,  Barry L. Brown ,  Paul M. Najt ,  James A. Eng

    Inventor： Tang-Wei Kuo ,  Barry L. Brown ,  Paul M. Najt ,  James A. Eng

    IPC: F02B3/04 ,  F02M25/07

    CPC classification number: F02D13/0215 ,  F02B1/12 ,  F02B2075/027 ,  F02B2075/125 ,  F02D13/0219 ,  F02D13/0265 ,  F02D13/0273 ,  F02D41/3041 ,  F02D41/402 ,  F02M26/01 ,  Y02T10/123 ,  Y02T10/18 ,  Y02T10/44

    Abstract: Part load operating point for a controlled auto-ignition four-stroke internal combustion engine is reduced without compromising combustion stability through load dependent valve controls and fueling strategies. Optimal fuel economy is achieved by employing negative valve overlap to trap and re-compress combusted gases below a predetermined engine load and employing exhaust gas re-breathing above the predetermined engine load. Split-injection fuel controls are implemented during low and intermediate part load operation whereas a single-injection fuel control is implemented during high part load operation. Split-injections are characterized by lean fuel/air ratios and single-injections are characterized by either lean or stoichiometric fuel/air ratios. Controlled autoignition is thereby enabled through an extended range of engine loads while maintaining acceptable combustion stability and emissions at optimal fuel economy.

    Abstract translation: 受控自动点火四冲程内燃机的零件负载工作点在不影响通过负载相关阀控制和加油策略的燃烧稳定性的同时减少。 通过使用负阀重叠来捕获并重新压缩低于预定发动机负荷的燃烧气体并且使用在预定发动机负载上方重新呼吸的排气来实现最佳燃料经济性。 在低和中间部分负载操作期间实施分体喷射燃料控制，而在高部分负载操作期间实施单次喷射燃料控制。 分离注射的特征在于贫燃料/空气比，单次注射的特征在于稀燃或化学计量的燃料/空气比。 因此，通过扩展的发动机负载范围可实现受控自燃，同时在最佳燃油经济性的同时保持可接受的燃烧稳定性和排放。

    Method to improve combustion stability in a controlled auto-ignition combustion engine
    25.
    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

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

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

    IPC: F02B51/02

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

    Abstract: 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.

    Abstract translation: 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
    26.
    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

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

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

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

    CPC classification number: 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

    Abstract: 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.

    Abstract translation: 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 operate a homogeneous charge compression-ignition engine
    29.
    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

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

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

    IPC: F02B9/04

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

    Abstract: 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.

    Abstract translation: 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。

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