The paper describes a high speed digital fuel injection and ignition system with a facility to obtain and read out instantaneous engine operating conditions. A brief history of events starting with the need to control air fuel ratio and ignition, and early work using analogue systems is given. The reasons for the abandonment of these analogue systems in favour of digital systems is explained. Based on the results obtained with analogue systems, a new more comprehensive operating strategy together with its algorithm is quoted. The significance of the various co-efficients and constants in the algorithm is explained. The realisation of the strategy by means of the digital system is discussed. The final system produced together with a brief exposition on the various possible operating modes, data input and so forth is shown, together with the development of unique sensors which enable the system to be applied to a standard engine. The system produces fuelling and ignition timing on a cylinder-by-cylinder, cycle-by-cycle strategy using up to seven 256 point memory maps.

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 47-68

Subject/Index Terms

Filing Info

  • Accession Number: 00393090
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: Proceeding, HS-037 234, HS-037 235
  • Files: HSL, USDOT
  • Created Date: Mar 29 1985 12:00AM