Temperature Control of Electrically Heated Catalyst for Cold-start Emission Improvement

Electrically Heated Catalyst (EHC) is a promising technique to reduce the cold-start emission since it enables fast light off for the Three Way Catalytic converter (TWC). In this paper, a composite controller with a Bang-bang Controller and an Active Disturbance Rejection Controller (ADRC) is proposed for the EHC temperature control to reduce cold-start emission. The temperature control includes two different phases: preheating phase (before engine starts) and post-heating phase (after engine starts). The simulation results based on 500 seconds preheating phase and 200 seconds post-heating phase (FTP-75 first 200 seconds) show that the composite controller can have fast tracking performance and small steady-state error.