| 摘要 |
The period of opening of a solenoid-operated fuel injector is stabilized against variation of vehicle battery voltage by computing the period of injector opening from the instant of a discontinuity present in each rise of the solenoid energizing current. The discontinuity is detected and differentiated to form one input to a comparator, the other input of which is supplemented from the vehicle battery through a Zener diode so that the comparison threshold of the comparator increases as the battery voltage increases. The comparator is automatically switched off in the absence of a solenoid energizing current.
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