×

Fuel octane responsive internal combustion engine ignition system

  • US 4,630,584 A
  • Filed: 03/28/1985
  • Issued: 12/23/1986
  • Est. Priority Date: 04/05/1984
  • Status: Expired due to Term
First Claim
Patent Images

1. In an internal combustion engine having a combustion chambera first sensor for sensing a parameter which varies with the presence of knocking phenomena in the combustion chamber of said engine;

  • a second sensor for sensing the load on said engine;

    a third sensor responsive to the rotational speed of said engine;

    a spark generating arrangement for producing a spark in said combustion chamber; and

    a control circuit responsive to the outputs of said first, second and third sensors for controlling the timing at which said spark is generated, said control circuit including control means for;

    (a) causing said spark to be initially generated according to a first schedule suitable for fuel having a first octane value,(b) sensing said engine entering a predetermined mode of operation;

    (c) advancing the ignition timing until said first sensor detects said knocking phenomena;

    (d) comparing the conditions under which said knocking occurs with pre-recorded data,(e) determining the octane value of the fuel being combusted in said combustion chamber, and(f) causing said spark to be generated according to a second schedule suitable for fuel having a second octane value higher than said first octane value in the event that the octane value of the fuel being combusted in said combustion chamber is determined to be higher than that for which said first schedule is suited.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×