US PATENT SUBCLASS 123 / 672
.~ Including exhaust gas condition responsive means

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
672.~ Including exhaust gas condition responsive means {11}
673  DF  .~.~> With sensor controlling each cylinder individually
674  DF  .~.~> With modifying or updating memory (i.e., learning) {1}
676  DF  .~.~> Exhaust gas temperature or pressure repsonsive
677  DF  .~.~> Combined with ambient condition responsive means (e.g., pressure) {1}
679  DF  .~.~> Combined with engine condition responsive means {6}
690  DF  .~.~> With fail-safe, backup, or malfunction means
691  DF  .~.~> Multiple sensors controlling group of cylinders {1}
693  DF  .~.~> With compensator for sensor output (e.g., current or voltage) {2}
698  DF  .~.~> With addition of secondary fluid (e.g., fuel or exhaust gas) {1}
701  DF  .~.~> With auxiliary control of carburetor {1}
703  DF  .~.~> Exhaust gas composition sensor

DEFINITION

Classification: 123/672

Including exhaust gas condition responsive means:

(under subclass 434) Subject matter wherein the means for forming the mixture of fuel and oxidant senses at least one characteristic or parameter of the products of combustion (e.g., composition, or temperature or pressure, etc.) and uses such information to modify the relative proportion or ratio of fuel and oxidant in the mixture supplied to the internal combustion engine.

(1) Note. A combination of an internal combustion engine with an exhaust treating or exhaust handling means in more than name only recited in the claims is classified in Class 60. An internal combustion engine with the exhaust handled or treated only as necessary to evacuate the combustion chamber or to modify operation of the engine recited in the claims is found in Class 123.

(2) Note. A computer or digital control system recited in the claims in combination with an internal combustion engine in more than name only or wherein the control system includes an algorithm peculiar to subject matter under the class definition by claim disclosure is classified in Class 123.

SEE OR SEARCH THIS CLASS, SUBCLASS:

205+, for rotary-type internal combustion engines with charge forming means.

SEE OR SEARCH CLASS

60, Power Plants,

272+, for an engine in which combusted gases are treated or handled after exhausting from the "working chamber". 73, Measuring and Testing,

23.31+, for analysis of combustion gases composition, per se.

204, Chemistry: Electrical and Wave Energy,

406+, for exhaust gas sensors, per se.

261, Gas and Liquid Contact Apparatus, appropriate subclasses for carburetors, per se.

701, Data Processing, Navigation, and Relative Location,

101+, for control means for internal-combustion engines including specific computer or data processing details.