Oxygen sensing method and apparatus

摘要

A method of determining an air:fuel ratio of a combustion process based on information from an oxygen sensor exposed to exhaust gases of the combustion process. A first value is determined indicative of the exhaust gas oxygen content, with the value being based on a resistance of an oxygen sensing portion of the oxygen sensor. A second value is determined indicative of a temperature of the oxygen sensor, which may be based on a resistance of a heater portion of the oxygen sensor. A third value is determined indicative of the air:fuel ratio as a function of the first and second values. Thus, the oxygen level data from the oxygen sensor may be temperature compensated so as to result in a more accurate estimate of the air:fuel ratio. The third value may then be used to control the combustion process, which may be associated with an internal combustion engine.

主权项

1. A method of determining an air:fuel ratio of a combustion process, based on information from an oxygen sensor exposed to exhaust gas from the combustion process, the method comprising:
determining a first value indicative of oxygen content of the exhaust gas based on information from an oxygen sensing portion of the oxygen sensor; determining a second value indicative of a temperature of the oxygen sensor corresponding in time to the first value; determining a third value indicative of the air:fuel ratio as a function of the first and second values, wherein the third value varies in dependence on both the first value and the second value.