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    • 1. 发明公开
    • Fuel injector and internal combustion engine
    • Kraftstoffeinspritzventil和Brennkraftmaschine
    • EP1072779A2
    • 2001-01-31
    • EP00115078.8
    • 2000-07-27
    • Hitachi, Ltd.Hitachi Car Engineering Co., Ltd.
    • Yamakado, MakotoTanabe, YoshiyukiTakahata, ToshioKubo, HiromasaHamada, YasunagaOkamoto, YoshioKadomukai, Yuzo
    • F02D41/20
    • F02D41/20F02D2041/2058F02D2200/503
    • The target peak current value where current value is reduced in conformity to the drop of voltage of battery (18) is stored in target peak current storage unit (68). ON-signals are sent from current control circuit (56) to power transistor (50) in response to the injection command pulse coming from engine controller (58) so that current is applied to coil (20). Then the current flowing to coil (20) is detected by the current detecting resistor (52). Comparator (62) compares this detected current and the target peak current value read from the target peak current storage unit (68) conforming to the voltage of battery (18). If agreement is found between these two values, OFF-signals are sent to power transistor (50) from current control circuit (56) in response to the switching command coming from comparator (62). Then the On/Off signals to send holding current to coil (20) are sent from current control circuit (56) to power transistor (50). The linearity of the injection volume despite changes in battery voltage can be maintained.
    • 目标峰值电流值存储在目标峰值电流存储单元(68)中,其中电流值与电池(18)的电压下降一致而减小。 响应于来自发动机控制器(58)的喷射命令脉冲,ON信号从电流控制电路(56)发送到功率晶体管(50),使得电流施加到线圈(20)。 然后,流过线圈(20)的电流由电流检测电阻(52)检测。 比较器(62)将检测到的电流与从电池(18)的电压对应的目标峰值电流存储单元(68)读取的目标峰值电流值进行比较。 如果在这两个值之间达成一致,响应于来自比较器(62)的切换命令,OFF信号从电流控制电路(56)发送到功率晶体管(50)。 然后,将来自线圈(20)的保持电流的开/关信号从电流控制电路(56)发送到功率晶体管(50)。 可以保持尽管电池电压的变化的注入体积的线性度。