| 摘要 |
A controller ( 70 ) controls the boost pressure of an internal combustion engine ( 60 ) comprising two intake/exhaust units, each intake/exhaust unit comprising a turbocharger ( 10 ) which supercharges intake air in an intake passage ( 20 ) using exhaust energy in an exhaust passage ( 30 ), and an exhaust gas recirculating device ( 40, 41 ) which recirculates a part of the exhaust gas in the exhaust passage to the intake passage. The controller ( 70 ) calculates an opening difference between valves in the two units (S 121 ), and controls a regulating device ( 13 ) in each of the two units on the basis of this opening difference (S 123 -S 125 ). As a result, the boost pressures of the turbochargers ( 10 ) match, and hence an equal amount of NOx can be discharged from each exhaust passage ( 30 ), and the NOx can be purified favorably by a catalyst.
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