Page 305 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey

Toyota Motor Co. Ltd. 287

heaters. When the engine starts, electric currents are fed to the heater-converters and the
temperatures of the heater-converters increase rapidly and reach the activating temperature
within a short time. Thus, the catalysts carried on the heater-converters are activated and start
to purify the exhaust gas of the engine as soon as the engine starts.

temp.

J
ICU
I

COOLANT TEMP.

Fig. 129 (from US5447696)