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    • 4. 发明授权
    • Digital timing system for spark advance
    • 数字定时系统,用于火花提前
    • US4408296A
    • 1983-10-04
    • US181941
    • 1980-08-27
    • Anthony D. RobbiJoseph O. Sinniger
    • Anthony D. RobbiJoseph O. Sinniger
    • F02P5/15F02P5/14G06M3/02
    • F02P5/1514G06Q30/0283Y02T10/46
    • A means to set spark timing in accordance with engine speed includes a counter to count clock pulses between engine speed reference pulses. A read-only memory has successive memory locations storing an addend quantity and a repeats number. An adder unit, including an accumulator, operates to access the memory locations, and to add the addend quantities to the contents of the accumulator repeatedly a number of times equal to the respective repeats numbers. A comparator produces an ignition firing pulse when the contents of the accumulator corresponds with the reference period number provided by the counter. Improved memory addressing means facilitates altering the spark advance in accordance with a sensed condition such as manifold vacuum, and conserves memory space.
    • 根据发动机速度设置火花正时的方法包括计数发动机转速参考脉冲之间的计数时钟脉冲。 只读存储器具有存储加数和重复数的连续存储单元。 包括累加器的加法器单元操作以访问存储器位置,并且将加数量反复添加到累加器的内容中等于各个重复次数的次数。 当累加器的内容与计数器提供的参考周期数相对应时,比较器产生点火点火脉冲。 改进的存储器寻址装置有助于根据诸如歧管真空的感测条件来改变火花提前,并且节省存储空间。