METHOD (VERSIONS) AND SYSTEM FOR CALCULATING AIR-FUEL RATIO BY MEANS OF OXYGEN SENSOR OF ALTERNATING VOLTAGE Russian patent published in 2019 - IPC F01N13/00 F02D41/14 F02D41/28 G01M15/10 

FIELD: internal combustion engines.

SUBSTANCE: invention is related to methods and systems for control of AC gases exhaust gas sensor for internal combustion engine. Method comprises steps of providing operation of first outlet oxygen sensor in AC voltage mode, including variation of reference voltage of first outlet oxygen sensor, and as a response to a first condition comprising increasing the reference oxygen sensor first reference voltage with the voltage threshold exceeding, determining the output signal of the first outlet oxygen sensor, corresponding to the increase in the reference voltage, correcting output signal of first outlet oxygen sensor based on change of its output signal and controlling engine operation based on corrected output signal.

EFFECT: accuracy of calculation of air-fuel ratio based on output signal of the sensor of exhaust gases can be stored, and engine control mode for fuel with feedback can be maintained operating even in period, when outlet oxygen sensor operates in AC voltage mode, which allows to reduce emission of harmful substances from engine, increase fuel economy and improve road quality of vehicle.

20 cl, 5 dwg