Fast Catalyst Light-off with Dynamic Skip Fire 2020-01-0313
Catalytic aftertreatment is commonly used to reduce toxic gas emission from internal combustion (IC). Fast catalyst light-off time is always been a challenge for automobile IC engine application. This paper experimentally studied the thermal management and toxic gas emission from spark ignition (SI) engine cold start period with dynamic skip fire (DSF).
The study has found that DSF can improve up to 100 °C exhaust gas temperature at catalyst inlet, and the exhaust enthalpy increased up to 20% for catalyst heating. 10% ~20% cold start CO and HC reduction can be achieved because of increasing exhaust gas temperature and enthalpy. Dynamic air pumping can further increase 30 °C exhaust gas temperature on top of DSF benefit, and nearly doubled catalyst heating power which reduced more than 50% cold start HC emission.
Xi Luo, Sam Hashemi, Ram Subramanian, Anastasios Arvanitis, Matthew Younkins