Fuel management system for variable ethanol octane enhancement of gasoline engines

  • US 9,810,166 B2
  • Filed: 03/20/2017
  • Issued: 11/07/2017
  • Est. Priority Date: 11/18/2004
  • Status: Active Grant
First Claim
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1. A fuel management system for a spark ignition engine which utilizes port fuel injection and also utilizes direct fuel injection;

  • and where there is a first torque range where direct injection and port injection are both used at the same value of torque throughout the first torque rangeand where in at least part of the first torque range as torque is increased the amount of fuel that is directly injected is changed so as to obtain knock-free operation and the amount of directly injected fuel used to provide knock-free operation is minimized.

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