Patent ID: 9212971
Filing Date: 2015-12-15
Classification: F01N,F02D,G01M

Abstract:
1. A method of heating an oxygen sensor, the method comprising: (a) determining, by a controller, a predetermined temperature for heating the oxygen sensor to; (b) determining, by the controller, a predetermined internal resistance value of an electro-chemical measurement cell of the oxygen sensor associated with the predetermined temperature; (c) applying, by the controller, a pulse-width-modulated signal to a heater included in the oxygen sensor; and (d) monitoring, by the controller, an internal resistance of the measurement cell while applying the pulse-width-modulated signal to the heater to determine when the internal resistance of the measurement cell reaches the predetermined internal resistance; and repeating steps (a) through (d) in each of a plurality of stages of a regeneration process for the oxygen sensor.