Module 5:Emission Control for SI Engines
  Lecture 25:Thermal Catalytic Deactivation, Summary of SI Emission Control
 


Summary of SI Engine Emission Control

The emission control technologies  adopted since the emission standards were implemented  for the first time in the USA are summarized in Table 5.4.

                                                                    Table 5.4

 Summary of Developments in Emission Control Technology for Gasoline Passenger Cars

          Model Year                     Technology
              1963 Positive crankcase ventilation (PCV) system
              1968 Evaporative emission control
              1973 EGR, Secondary air injection, Thermal reactor, Spark advance ontrol
              1975 Oxidation catalytic converter for CO and HC, Lead-free gasoline
              1977 4-Valve combustion chambers

              1981

 3-Way catalysts for control of CO, HC and NOx, λ-sensor, and electronic control
              1988 Variable valve timing and lift, VVT, Honda VTEC
              1990

Port fuel injection (PFI) universally adopted, death of carburetor
              1994 Onboard Diagnostics (OBD) systems
              1996 First  DISC  engines by Mitsubishi and Toyota, de-NOx catalysts
              1999

Phasing in of LEV standards, closed-coupled catalysts
              2004 HC- adsorber/traps catalysts, thin wall substrates