US PATENT SUBCLASS 123 / 568.16
.~.~ With electrical means for fail-safe, backup, or malfunction detecting of EGR system

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
568.11  DF  .~ Exhaust gas used with the combustible mixture (e.g., emission control Exhaust Gas Recirculation (EGR) valve) {10}
568.16.~.~ With electrical means for fail-safe, backup, or malfunction detecting of EGR system

DEFINITION

Classification: 123/568.16

With electrical means for fail-safe, backup, or malfunction detecting of EGR system:

Subject matter under subclass 568.11 wherein the means for forming a mixture of fuel and oxidant includes electrical means that upon detecting failure in an EGR system element (a) shifts operation (1) into a substitute circuit or (2) to a substitute mechanism to accomplish the same function, or (b) indicates functioning of the EGR system or EGR system element outside of acceptable parameters.

(1) Note. The EGR system itself need not be electrically operated, however, the mere inclusion of an electrical switch whose state (i.e., on or off) is changed in response to abnormal operation of the EGR system to turn on an indicating device is sufficient for placement in this subclass.

SEE OR SEARCH CLASS

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

101+, for a data processing system associated with an internal-combustion engine, where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed, especially subclasses 102+ for a data processing system associated with an internal-combustion engine having a digital or programmed data processor, where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed, subclass 107 for a digital or programmed data processing system associated with an internal-combustion engine is designed to detect an abnormality in operating conditions and carry out the appropriate sequence of instructions to stabilize the air/fuel ratio or fuel injection operation,

where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed, subclass 114 for digital or programmed data processing system associated with an internal-combustion engine includes specific structure to function as either a backup, interruption, reset, or test circuit, where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed.