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Electronic fuel injection control system

  • US 4,100,891 A
  • Filed: 08/07/1974
  • Issued: 07/18/1978
  • Est. Priority Date: 08/07/1974
  • Status: Expired due to Term
First Claim
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1. An electronic system for controlling fuel injection into the cylinders of an internal combustion engine comprising:

  • timing signal generator means for generating a series of pulses in sequence, the leading edge of each of said pulses corresponding to the opening of the intake valve of one of the engine cylinders respectively,means for generating a digital pulse count signal which varies with preselected engine parameters comprising means for generating a voltage having a magnitude inversely proportional to intake manifold vacuum, means for generating a voltage having a magnitude inversely proportional to engine temperature means for summing said voltages to provide a single analog signal, analog/digital converter means for converting said analog signal to a digital signal, and storage means for storing said digital signal, said analog/digital converter means including means for periodically generating an updated digital signal in accordance with a more current value of the analog signal and providing said updated signal to said storage means, andcontrol signal generator means responsive to the outputs of said timing signal generator means and said storage means for generating a pulse signal for controlling the fuel injection for each of the cylinders, each of said pulse signals having a leading edge which corresponds to the leading edge of a respective one of the pulse outputs of the timing signal generator means and a duration in accordance with said digital signal pulse count.

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