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FUEL INJECTION SYNCHRONIZING SYSTEM

  • US 3,612,009 A
  • Filed: 08/19/1969
  • Issued: 10/12/1971
  • Est. Priority Date: 08/28/1968
  • Status: Expired due to Term
First Claim
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1. A synchronized fuel injection system for producing and distributing fuel injection exciting pulses which are synchronous with the operation of the cylinders of an internal combustion engine and which have a time duration that is automatically varied by a DC parameter signal representing at least one engineoperating parameter, said system comprising:

  • first and second switching means, each such means corresponding to a particular cylinder of said engine, means for sequentially and repetitively operating said switching means in synchronism with the operation of said engine, an adding circuit means for providing a composite sum output of uniform pulses, each representing the actuation of either one of said switching means, sawtooth generator means electrically connected to said adding circuit means for producing a sawtooth shaped waveform synchronous with said composite sum output, comparing means electrically connected to said sawtooth generator means for comparing said sawtooth waveform with said DC parameter signal and for providing a timed output pulse in synchronism with said sawtooth waveform and having a time duration that is a predetermined function of said DC parameter signal, bistable distributor means for providing first and second outputs corresponding to the actuation of said first and second switching means respectively, first drive means electrically connected to said comparing means and to said distributor means for providing a first fuel injection valve exciting pulse when both said timed output pulse and said first output are present thereby providing a timed fuel injection signal for the cylinder corresponding to said first switching means, and second drive means electrically connected to said comparing means and to said distributor means for providing a second fuel injection valve exciting pulse when both said timed output pulse and said second output are present thereby providing a timed fuel injection signal for the cylinder corresponding to said second switching means.

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