Temperature control of a catalytic converter

摘要

In an ic engine having a catalytic convertor, the catalyst heater 12 is controlled in dependance upon an estimate of the temperature of the catalyst so that there is no need for a sensor in the hostile environment of the exhaust. A valve indicative of the catalyst temperature is stored and modified in accordance with a model of the catalyst temperature. The model can be a mathematical mood carried out by a signal processor or an electrical model with the catalyst temperature being represented by the charge stored on a capacitor (Figure 2).