System Description: Description
The exhaust treatment function reduces the following exhaust emissions included in exhaust gas.
- Nitrogen oxide (NOx)
- Carbon hydrate
- Carbon monoxide
To reduce exhaust emissions, it is necessary to quickly raise catalyst temperature to the operating temperature especially when performing cold start.
NOTE:
ECM controls the solenoid actuators of intake camshaft and exhaust camshaft and determines valve overlap. Exhaust gas recirculation rate is controlled by interior EGR.
The exhaust treatment function has a control item and functions as follows.
- Three way catalyst function
- Shift performance curve control
- Catalyst efficiency monitor function