| 摘要 |
<P>PROBLEM TO BE SOLVED: To hold a catalyst device at a proper temperature state while restraining exhaust of NOx and smoke. Ž<P>SOLUTION: The exhaust emission control system is equipped with: a plurality of air intake superchargers which is arranged in series and includes a motor-driven supercharger (217) capable of supercharging intake air in a positively rotating state corresponding to one rotative direction of a motor (400); EGR passages (301, 302, 311, 312) capable of feeding an EGR gas to an air intake system; an EGR supercharger (307) which is arranged on the same shaft as the motor-driven supercharger and is capable of supercharging or exhausting the EGR gas depending on the positively rotating state or a negatively rotating state, respectively; a blocking means (403) capable of blocking the supply of driving force for accelerating the negative rotation of the motor-driven supercharger, a discriminating means (100) for discriminating whether the catalyst device (500) is in a prescribed OT state or not, and a control means (100) for controlling the motor so that the EGR supercharger becomes the negative rotating state when it has been discriminated that the catalyst device is in the OT state. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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