A method and apparatus determine exhaust gas temperature and control the heater of a heated exhaust gas oxygen sensor. Heater failures are diagnosed based on the level of current flowing through the heater. Exhaust gas temperature is determined by using a Kalman filter. The exhaust gas temperature sensor is eliminated while maintaining a high degree of accuracy. Current flowing through the heater is used to calculate the temperature of the heater. The temperature of the heater is compared to a desired temperature range and the current to the heater is adjusted to maintain the desired temperature range.

Un método y un aparato determinan temperatura del gas de escape y controlan el calentador de un sensor calentado del oxígeno del gas de escape. Se diagnostican las faltas del calentador basaron en el nivel de la corriente que atraviesa el calentador. La temperatura del gas de escape es determinada usando un filtro de Kalman. Se elimina el sensor de temperatura del gas de escape mientras que mantiene un alto grado de exactitud. La corriente que atraviesa el calentador se utiliza para calcular la temperatura del calentador. La temperatura del calentador se compara a una gama de temperaturas deseada y la corriente al calentador se ajusta para mantener la gama de temperaturas deseada.

 
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