| 摘要 |
PURPOSE:To suppress surge by concentrating the air fuel ratio when the variation of revolution over a prescribed value is detected in the lean air fuel ratio operation. CONSTITUTION:In the ordinary operation state, the fundamental injection quantity signal supplied from a fundamental injection quantity setting means A is corrected through an air fuel ratio correcting means D by using the correction coefficient of a feed/forward correction coefficient setting means B so that a lean air fuel ratio is obtained. When the revolution variation quantity detected by a revolution variation detecting means C exceeds a prescribed value, the air fuel ratio is corrected by the air fuel ratio correcting means D so that the air fuel ratio becomes larger than an aimed lean air fuel ratio. Therefore, the surge in the lean air fuel ratio operation can be suppressed.
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