| abstract |
(57) [Problem] To prevent a torque fluctuation from occurring in any of lean combustion and rich combustion. SOLUTION: An intake air amount adjusting means (21, 18) capable of adjusting an intake air amount, a fuel supply means (17) for supplying fuel to an engine, and a method for performing lean combustion and rich combustion or stoichiometric combustion depending on operating conditions. A combustion state setting means (31) for setting any one of them; the intake air amount adjusting means (21, 18) during lean combustion; and the fuel supply means (17). Using the air leading type control means (31) for performing air leading type control by using the above, the intake air amount adjusting means (21, 18) and the fuel supply means (17) at the time of rich combustion or stoichiometric combustion. Fuel-advanced control means (31) for performing fuel-advanced control. |