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    • 17. 发明授权
    • Method for changing the operating mode of a direct-injection otto cycle internal-combustion engine
    • 改变直喷循环内燃机运行模式的方法
    • US06196183B1
    • 2001-03-06
    • US09325653
    • 1999-06-04
    • Bernd BauerAndreas HertzbergCharles Robert KochAndreas Biemelt
    • Bernd BauerAndreas HertzbergCharles Robert KochAndreas Biemelt
    • F02B1700
    • F02D41/401B01D53/9495F01N3/0814F01N3/0842F02B1/04F02B17/005F02B23/101F02B2075/125F02D13/0226F02D41/0275F02D41/1463F02D41/187F02D41/3029F02D41/307F02D2041/001F02D2041/2024F02D2041/389F02P5/045F02P5/145Y02T10/123Y02T10/128Y02T10/44Y02T10/46
    • A direct-injection Otto cycle internal-combustion engines can be operated in the stratified charge mode with a later fuel injection during the compression cycle and a lean mixture formation and, with an operating mode with a homogeneous mixture formation, by fuel injection during the intake cycle which is provided for higher load ranges of the internal-combustion engine. The exhaust gases of the internal-combustion engine are decontaminated by an NOx storage catalyst which must be periodically regenerated during a homogeneous mixture formation and at rich fuel/air ratios (&lgr;). To permit a fast change of the operating mode and particularly the regeneration of the storage catalyst without changing the running performance of the internal-combustion engine, the fuel quantity to be injected per power cycle, is apportioned during a homogeneous operating phase during the change of operating modes, corresponding to the actual intake air flow rate by adjusting the respective injection time. Isochronously and proportionally to the change of the injection time, the ignition point in time is adjusted in the direction of a late ignition. The homogeneous operating phase is limited by a change-over point in time at which the injection end of the fuel injection is shifted into the power cycle provided for the demanded operating mode.
    • 直喷奥托循环内燃机可以在分层充气模式下运行,在压缩循环期间随后进行燃料喷射,并且在进气期间通过燃料喷射形成贫混合物,并具有均匀混合物形成的操作模式 循环,其被提供用于内燃机的较高负载范围。 内燃机的废气由NOx储存催化剂净化,NOx储存催化剂必须在均匀混合物形成期间和富燃料/空气比(lambd)下周期性地再生。 为了允许快速改变操作模式,特别是储存催化剂的再生而不改变内燃机的运行性能,每个功率循环中要喷射的燃料量在均匀运行阶段期间分配,在改变期间 操作模式,通过调节相应的喷射时间对应于实际进气流量。 与注射时间的变化同步且成比例地,点火时间点的调整点在点火方向上。 均匀的运行阶段受到燃料喷射的喷射端被转移到为所需操作模式提供的动力循环中的转换时间点的限制。