Masamitsu Nakano

Further exhaust emission control for two-stroke engines

Two-stroke engines are being utilized in large numbers as small utility, lawn and garden equipment engines. The following two subjects were examined with regards to exhaust emission control. The first subject was to compare the theoretical values of a combustion model simulation with the experimentally measured values of the base line emission of two-stroke volume. The second subject was to examine the emission conformability to the 1995 and 1999 California Air Resources Board (CARB) exhaust emission regulations California Regulations for 1995 and Later Utility and Lawn and Garden Equipment Engine, adopted at March 20, 1992, amended, at November 3, 1993. in two-stroke engines with various combinations between various fuels, fuel supply systems and scavenging systems. For this subject it was determine;that the emission control systems based on the lean combustion can be used to meet the 1995 CARB exhaust emission regulations. However, it was also concluded that to meet the 1999 CARB exhaust emission regulations, various emission control systems with various combinations regarding such parameters as fuels, scavenging systems and exhaust systems must be used. 27 refs., 20 figs., 4 tabs.