US PATENT SUBCLASS 123 / 406.3
.~.~.~.~.~ Fuel quality or composition signal responsive

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.12  DF  .~ Electronic control {10}
406.19  DF  .~.~ Closed loop feedback control of spark timing {5}
406.26  DF  .~.~.~ Combustion condition responsive {4}
406.29  DF  .~.~.~.~ Engine knock responsive {4}
406.3.~.~.~.~.~ Fuel quality or composition signal responsive {2}
406.31  DF  .~.~.~.~.~.~> Alcohol concentration responsive
406.32  DF  .~.~.~.~.~.~> Having a plurality of speed/load maps related to fuel quality or composition

DEFINITION

Classification: 123/406.3

Fuel quality or composition signal responsive:

(under subclass 406.29) Subject matter wherein the regulating means to vary spark ignition timing is additionally responsive to a signal indicative of either (a) how well the combustible material burns (e.g., octane rating, grade) or (b) the relative proportion of constituent chemicals in the combustible material.

SEE OR SEARCH CLASS

73, Measuring and Testing, appropriate subclasses, especially

53.01+, for a fuel quality or composition sensing, per se.

701, Data Processing: Vehicles, Navigation, and Relative Location,

103, for digital or programmed data processing system associated with an internal combustion engine, designed to control the air/fuel ratio or the injection of fuel based on engine operating conditions or environmental conditions, where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed.