| 摘要 |
PURPOSE:To increase the number of revolution in prerevolution by retarding the ignition timing immediately before the prerevolution of a high load supercharger, in the constitution in which a low load supercharger and the high load supercharger are installed and the high load supercharger is put into prerevolution before drive. CONSTITUTION:During the engine operation, an ECU 46 judges if the engine operation state at present is in a region (P+S region) for driving both of a primary turbosupercharger 4 and a secondary turbosupercharger 6. If the judgement is 'YES', it is judged if the engine operation state is in both the supercharger driving state or not, and if the judgement is 'NO', a prerevolution time setting timer and a retard control setting timer for ignition timing are started. Then it is judged if the prerevolution time setting timer counts up or not, and if the judgement is 'NO', the ignition timing in an ignition timing retard control time is retarded, and the temperature of the exhaust gas is raised. Accordingly, the number of revolution in prerevolution of the secondary turbosupercharger 6 is increased speedily. |
