US PATENT SUBCLASS 701 / 107
.~.~.~.~.~ Fail-safe system

Current as of: June, 1999
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701 /   HD   DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION

1  DF  VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19}
99  DF  .~ With indicator or control of power plant (e.g., performance) {2}
101  DF  .~.~ Internal-combustion engine {1}
102  DF  .~.~.~ Digital or programmed data processor {7}
103  DF  .~.~.~.~ Control of air/fuel ratio or fuel injection {6}
107.~.~.~.~.~ Fail-safe system

DEFINITION

Classification: 701/107

Fail-safe system:

(under subclass 103) Control system wherein the digital or programmed data processing system 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.

SEE OR SEARCH CLASS

123, Internal-Combustion Engines,

395+, for an engine speed regulator responsive to (a) an engine parameter or (b) an environmental condition to alter the present engine speed without regard to the resulting engine speed, subclasses 406.13+ for a spark ignition timing regulator which includes upon detecting failure in a circuit or circuit 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 circuit or circuit element outside of accepted parameters, subclass 479

for a fail safe fuel injector system, and subclass 690 for a charge forming device with fail-safe, backup, or malfunction means including an exhaust gas condition responsive means.

708, Electrical Computers: Arithmetic Processing and Calculating,

530+, for an electric digital calculating computer having a specialized function of error detection or correction.