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    • 2. 发明申请
    • Multi-stage compression ignition engine start
    • 多级压缩点火发动机起动
    • US20050252474A1
    • 2005-11-17
    • US10846013
    • 2004-05-14
    • Jy-Jen SahGregory HubbardWilliam CawthorneXuefeng TaoTodd Steinmetz
    • Jy-Jen SahGregory HubbardWilliam CawthorneXuefeng TaoTodd Steinmetz
    • F02D41/06F02N11/00F02N11/08F02N15/00F02N99/00F02N17/00
    • F02D41/064F02N11/08F02N2300/102
    • A powertrain includes a diesel compression engine and an electric machine operatively coupled thereto and effective to rotate the engine during engine cranking. Cold engine cranking is accomplished in a staged manner including a first stage wherein the engine is cranked to a first speed below the resonant speed of the coupled engine and electric machine combination for a first duration and thereafter cranked to a second speed above the resonant speed for a second duration. Transition out of cranking at the first and second speeds is accomplished when relative combustion stability is demonstrated. Cranking at the first or second speed is aborted when excessive crank times or if low battery voltages are observed. A third stage is included wherein the engine is cranked to a third speed below the engine idle speed. Transition out of cranking at the third speed is accomplished when relative combustion stability is demonstrated, whereafter normal engine control takes over.
    • 动力系包括柴油压缩发动机和可操作地联接到其上的电机,并且在发动机起动期间有效地使发动机旋转。 冷发动机起动以分阶段方式实现,包括第一阶段,其中发动机起动至低于联合发动机和电机组合的共振速度的第一速度,并且之后起动至高于谐振速度的第二速度 第二个持续时间。 当相对燃烧稳定性得到证实时,可以以第一和第二速度转换起动。 在超过曲柄时间或观察到电池电压不足时,以第一或第二速度起动。 包括第三级,其中发动机起动至低于发动机怠速转速的第三速度。 当相对燃烧稳定性得到证明时,在第三速度下转变为起动,此后正常的发动机控制接管。