Oxygen sensor input circuit, has bias module connected with oxygen sensor, and switch module selectively connecting bias module with oxygen sensor based on predetermined period of time after starting engine

摘要

The circuit (200) has an oxygen sensor (206), and a bias module (204) connected with the oxygen sensor and producing a bias. A switch module (202) selectively connects the bias module with the oxygen sensor based on a predetermined period of time after starting an engine. A sensor monitoring module (210) includes a sensor that compares a parameter e.g. voltage, of the oxygen sensor with a predetermined oxygen sensor value. The connection of the bias module with the oxygen sensor is based on the comparison of the parameter.