Electronic lean burn design for fuel efficiency

The chrysler electronic lean burn system was designed to meet the conflicting requirements of exhaust emissions, fuel economy and driveability. Conventional exhaust emission control systems use exhaust gas recirculation or spark retard to achieve control of oxides of nitrogen at the expense of fuel economy. The electronic lean burn system uses lean air/ fuel mixtures to reduce oxides of nitrogen and improve fuel economy. This also enables the use of more spark advance to further improve fuel economy and driveability. The electronic lean burn spark control computer monitors many more engine variables than conventional systems. It can, in fact, respond to various traffic conditions and adjusts spark advance accordingly for optimum fuel economy and control of exhaust emissions (a).