US PATENT SUBCLASS 123 / 406.24
.~.~.~ Including means responsive to the instantaneous change in engine speed (e.g., roughness, unstable combustion, etc.)


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}
406.24.~.~.~ Including means responsive to the instantaneous change in engine speed (e.g., roughness, unstable combustion, etc.) {1}
406.25  DF  .~.~.~.~> Acceleration or deceleration responsive


DEFINITION

Classification: 123/406.24

Including means responsive to the instantaneous change in engine speed (e.g., roughness, unstable combustion, etc.):

Subject matter under subclass 406.19 wherein the regulating means is responsive to sudden variations in the rate of rotation of an engine output shaft.

(1) Note. The patents placed in this and the indented subclass must at least sense and respond to instantaneous changes in engine speed. Those patents which sense and respond to changes in the combustion chamber without sensing instantaneous changes in engine speed are classified in the subclasses below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

406.2+, for an engine spark ignition timing control having a closed loop feedback control with separate control for each cylinder.

406.26+, for an engine spark timing control responsive to sensed changes within the combustion chamber.

436, for a charge forming device including means responsive to instantaneous change in engine speed.

SEE OR SEARCH CLASS

701, Data Processing: Vehicles, Navigation, and Relative Location, 111, for a digital or programmed data processing system associated with an internal combustion engine, designed to control or sense vibration, roughness, or knocking condition of the engine where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed.