E-CAT Control Function
The primary function of the E-CAT control module is to simultaneously control the heating of both E-CAT heating coils through high amperage (120A each) power output switches. ECM I signals the E-CAT module via the CAN bus requesting activation and deactivation of the heating coils. Heating time is for a maximum of 30 seconds but can be shorter in duration depending on monitored conditions.
When on, the metallic back-up converters which are located just behind the heating coils, heat up rapidly. As a result, catalytic converter light-off starts almost immediately reducing cold start emissions in the warm-up phase.
The E-CAT module receives two redundant starter battery temperature signals for monitoring the battery temperature.
The sensors are located in a sealed housing connected directly to the positive terminal of the battery.
If the starter battery temperature falls below 0°C, the E-CAT heating coils are not switched on.
Once the E-CATs are activated, the control module simultaneously provides the output control signal to the dual battery isolation switch (signal KATON) requesting the switch which opens the circuit between the starter battery and vehicle circuit battery. This ensures the E-Cat's operating power is supplied only from the starter battery (detailed description of two battery system further on).