Using resistance equivalent to estimate heater temperature of an exhaust gas after-treatment component

摘要

A temperature of a heated component is determined for control and monitoring. The heater driver, upon receipt of a turn-on signal, generates a current within a component of an electronic catalyst or exhaust after-treatment component, wherein the current through the component generates an appropriate loss to generate heat for facilitation of an exhaust after-treatment process. The heater driver regulates the energy to the heated component based on the electrical resistance of that component as a function of temperature and a predetermined reference value for that temperature.

主权项

1. A method comprising:
differentially measuring a voltage drop across an electronic-catalyst heater of an exhaust gas after-treatment component; measuring an amount of electrical current passing through the electronic-catalyst heater; generating a voltage equivalent heater resistance signal, by determining a division equivalent of dividing the differentially measured voltage drop across the electronic-catalyst heater by the measured amount of electrical current passing through the electronic-catalyst heater; comparing the voltage equivalent heater resistance signal to a resistance reference value signal to generate an equivalent temperature rise signal; integrating the equivalent temperature rise signal over time; comparing the equivalent temperature rise signal integrated over time to a temperature reference value to generate a temperature control signal, which is configured to turn off the electronic-catalyst heater when the comparison of the equivalent temperature rise signal integrated over time to the temperature reference value indicates that the electronic-catalyst heater is hotter than a threshold temperature.