Systems and methods for controlling fuel that is supplied to cylinders of an internal combustion engine are described. In one example, oxygen sensors are placed in an exhaust system of an engine such that each oxygen sensor may detect exhaust gas from a pa...

A gas concentration measuring apparatus comprising a gas concentration sensor equipped with a sensor element which is made of a solid electrolyte body and a pair of electrodes affixed to the solid electrolyte body, a sensor control circuit connected to the...

According to a first aspect of the present invention, there is provided an apparatus for detecting variation abnormality in an air-fuel ratio between cylinders comprising a wide-range air-fuel ratio sensor (42) and an Osensor (56) provided in an exhaust pa...

A gas concentration measuring apparatus for use in air-fuel ratio control of motor vehicle engines is provided which is designed to detect and identify a cause of failure in operation of an A/F sensor. The apparatus works to apply the voltage to a sensor e...

The invention relates to an engine controller (1), which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor (52), can detect a degree of the deterioration with high accuracy, and can optimize...

An oxygen concentration detection system (100) including an oxygen sensor (1) which outputs a plurality of types of measurement signals and anomaly detection means and modification means. The anomaly detection means detects a sensor anomaly by determining ...