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    • 9. 发明申请
    • HIGH COMPRESSION RATIO, HYDROGEN ENHANCED GASOLINE ENGINE SYSTEM
    • 高压缩比,加氢汽油发动机系统
    • WO2003042521A2
    • 2003-05-22
    • PCT/US2002/035623
    • 2002-11-06
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGYCOHN, Daniel, R.BROMBERG, LeslieRABINOVICH, AlexanderHEYWOOD, John, B.
    • COHN, Daniel, R.BROMBERG, LeslieRABINOVICH, AlexanderHEYWOOD, John, B.
    • F02D
    • F02D41/005F02B1/12F02B43/10F02B47/04F02B51/00F02D19/0644F02D19/0671F02D19/081F02D35/027F02D41/0025F02D41/0027F02D41/3023F02D2250/36F02M25/10F02M26/13Y02T10/32Y02T10/36Y02T10/47Y10S123/12
    • A hydrogen enhanced gasoline engine system using high compression ratio is optimized to minimize NOx emissions, exhaust aftertreatment catalyst requirements, hydrogen requirements, engine efficiency and cost. In one mode of operation the engine is operated very lean (equivalence ratio O = 0.4 to 0.7) at lower levels of power. Very lean operation reduces NOx to very low levels. A control system is used to increase equivalence ratio at increased torque or power requirements while avoiding the knock that would be produced by high compression ratio operation. The increased equivalence ratio reduces the amount of hydrogen required to extend the lean limit in order to avoid misfire and increases torque and power. Reduced hydrogen requirements at high power can significantly reduce the cost and size of onboard hydrogen generator technology. Increased in-cylinder turbulence and stratified hydrogen injection can be used to minimize hydrogen requirements for operation at a given equivalence ratio value. In another embodiment, vehicle NOx emissions can be suppressed to low levels and knock can be prevented by use of hydrogen enhanced exhaust gas recirculation (EGR) at all power levels with stoichiometric operation and a 3-way exhaust aftertreatment catalyst. Alternatively, EGR can be used with lean operation to keep NOx at low levels while the equivalence ratio is increased to provide higher torque and power capability. The effect of reduced peak power due to charge dilution to avoid knock can be minimized by boosting, using turbocharging or supercharging.
    • 优化了使用高压缩比的氢气增强型汽油机系统,以最大限度地减少NOx排放,废气后处理催化剂要求,氢气需求,发动机效率和成本。 在一种操作模式中,发动机在较低功率水平下运行非常稀薄(当量比O = 0.4至0.7)。 非常精益操作将NOx降低到非常低的水平。 控制系统用于在增加转矩或功率要求的同时提高当量比,同时避免由高压缩比操作产生的爆震。 增加的当量比减少了扩大稀薄极限所需的氢气量,以避免失火并增加扭矩和功率。 在大功率下降低氢气需求可显着降低机载氢发生器技术的成本和尺寸。 可以使用增加的缸内湍流和分层氢气喷射来最小化在给定的当量比值下操作的氢气需求。 在另一个实施方案中,车辆NOx排放可以被抑制到低水平,并且可以通过使用具有化学计量操作的所有功率水平的氢增强废气再循环(EGR)和三向排气后处理催化剂来防止爆震。 或者,EGR可以用于稀薄运行,以将NOx保持在低水平,同时增加当量比以提供更高的扭矩和功率能力。 通过使用涡轮增压或增压来升压,可以将由于充电稀释而引起的峰值功率降低以避免爆震的效果最小化。