| 摘要 |
Within a predetermined time immediately after start up, ignition timing is retarded within a range wherein the output fluctuations do not exceed a predetermined permissible limit. Subsequently under conditions after elapse of the predetermined time but when warm up has not yet been completed, air-fuel ratio is weakened within a range wherein the output fluctuations do not exceed a predetermined permissible limit. Then after warm up an exhaust gas recirculation amount is increased within a range wherein the output fluctuations do not exceed a predetermined permissible limit.
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