US PATENT SUBCLASS 123 / 406.11
SPARK IGNITION TIMING CONTROL

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

406.11SPARK IGNITION TIMING CONTROL {5}
406.12  DF  .~> Electronic control {10}
406.67  DF  .~> Vacuum timing control {5}
406.74  DF  .~> Mechanical or hydraulic link to throttle valve or accelerator
406.75  DF  .~> Centrifugal timing mechanism
406.76  DF  .~> Spark delay actuated or deactuated by starting device

DEFINITION

Classification: 123/406.11

SPARK IGNITION TIMING CONTROL:

(under the class definition) Subject matter wherein (a) a short pulse or flow of electric current which arcs across a pair of electrodes in the combustion chamber is used to cause a mixture of combustible material and oxidant in the combustion chamber to burn (i.e., spark ignition), (b) the engine has a point of piston travel or crankshaft rotation during each combustion cycle at which the spark ignition occurs (i.e., spark ignition timing), and (c) the engine has a regulator means (i.e., control) to vary spark ignition timing in response to a change in either (1) an engine operating condition (e.g., temperature, load, etc.), (2) an ambient operating condition (e.g., ambient temperature, barometric pressure, etc.) or (3) the position of a manually operated control device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

146.5, for a mechanical ignition distributor in combination with an internal combustion engine.

179.5, for control of spark ignition during starting which do not include timing control.

329, for an engine speed regulator control responsive to a deceleration mode including means to retard spark ignition timing.

339.11, for idle speed control of an internal combustion engine by regulating spark ignition timing.

594+, for spark ignition systems which do not include timing control.

SEE OR SEARCH CLASS 200, Electricity: Circuit Makers and Breakers,

19.01+, for a periodic circuit maker and breaker and subclasses 80+ for a centrifugal circuit maker and breaker

(e.g., an ignition distributor, rotor or breaker points).

324, Electricity: Measuring and Testing,

378+, for means for testing electrical ignition systems for internal combustion engines

464, Rotary Shafts, Gudgeons, Housing, and Flexible Couplings For Rotary Shafts,

1+, for a particular relationship between a rotary shaft of a component such as an ignition distributor and ignition points.