摘要:
Means for cleaning exhaust gas in a reciprocating piston type automobile engine comprising fuel supply means for supplying a lean fuel-air mixture, means provided downstream of the fuel supply means for sufficiently atomizing the supplied fuel, primary and auxiliary ignition plugs provided in each engine combustion chamber, and means for determining the ignition timing of the auxiliary plug 0* to 25* different from that of the primary plug in accordance with the operating condition of engine.