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    • 11. 发明申请
    • METHOD AND DEVICE FOR DETECTING PWM WAVE
    • 用于检测PWM波的方法和装置
    • WO2011076103A1
    • 2011-06-30
    • PCT/CN2010/080050
    • 2010-12-21
    • BYD COMPANY LIMITEDLIU, YuSHEN, XiaofengZHANG, Jianhua
    • LIU, YuSHEN, XiaofengZHANG, Jianhua
    • G01R29/02
    • G01R29/0273G01R29/02
    • A method for detecting PWM wave comprises: starting counting when a PWM wave is detected; interrupting the counting when a value of the counting reaches a predetermined value; determining whether electric level of the PWM wave during the interruption is high electric level or low electric level; clearing the value of the counting, starting a next counting and interrupting the next counting when a value of the next counting reaches the predetermined value; determining whether the electric level of the PWM wave during the interruption of the next counting is high electric level or low electric level; clearing the value of the counting and repeating the counting and the determining until one period of the PWM wave; and calculating a duty ratio of the PWM wave based on a number of high electric level and a number of low electric level determined within one period of the PWM wave.
    • 一种用于检测PWM波的方法包括:当检测到PWM波时开始计数; 当计数值达到预定值时中断计数; 确定中断期间PWM波的电平是高电平还是低电平; 清除计数值,开始下一个计数,并且当下次计数的值达到预定值时中断下一个计数; 确定下次计数中断期间的PWM波的电平是高电平还是低电平; 清除计数值,重复计数和确定直到PWM波的一个周期; 以及基于在PWM波的一个周期内确定的高电平和低电平的数量来计算PWM波的占空比。
    • 16. 发明申请
    • SYNCHRONIZING COMMON RAIL PUMPING EVENTS WITH ENGINE OPERATION
    • 与发动机运行同步通用铁路泵送事件
    • WO2009073131A2
    • 2009-06-11
    • PCT/US2008013140
    • 2008-11-25
    • CATERPILLAR INCSHAFER SCOTTZHANG JIANHUAIBRAHIM DANIEL
    • SHAFER SCOTTZHANG JIANHUAIBRAHIM DANIEL
    • F02M37/04
    • F02M63/0225F02M39/00
    • Noise and vibrations associated with a common rail fuel system (12) drive linkage (31) are reduced by synchronizing a high pressure common rail (24) supply pump with engine operation. This may be accomplished by selecting a linkage (31) associated with a desired ratio of engine speed to pump speed along with selecting a number of pump plungers and cam lobes (35) that results in synchronizing action of the pump with engine combustion events. In particular, a pattern of pumping events (80) per engine cycle repeats during each engine cycle. In a more sophisticated version, the pattern of pumping events (80) per engine cycle includes a sub-pattern of pumping events (80) that repeats an integer number of times each engine cycle, where the integer number equals the number of engine cylinders (15).
    • 通过使高压共轨(24)供应泵与发动机操作同步,减少与共轨燃料系统(12)驱动联动装置(31)相关联的噪声和振动。 这可以通过选择与期望的发动机转速与泵速的比率相关联的联动装置(31)以及选择一些泵柱塞和凸轮凸角(35)来实现,这导致泵与发动机燃烧事件的同步动作。 特别地,每个发动机循环的泵送事件(80)的模式在每个发动机循环期间重复。 在更复杂的版本中,每个发动机循环的泵送事件(80)的模式包括泵送事件的子模式(80),其重复每个发动机循环的整数次,其中整数等于发动机气缸的数量 15)。