| 摘要 |
<p>The invention provides a boost-pressure control apparatus, which includes a motor-assisted turbocharger (26), a variable nozzle mechanism (41) and a boost-pressure control means (28), that suppresses fluctuations in exhaust manifold pressure, and accurately controls boost pressure. In an engine equipped with the boost-pressure control apparatus according to the invention, the boost-pressure of the turbocharger may be controlled through boost-pressure control using a motor as well as a boost-pressure control using a variable nozzle mechanism. In correcting deviations of the actual boost pressure from the target boost pressure, when the deviation is great, the boost-pressure control means gives a higher priority to the boost-pressure control using the motor than to the boost-pressure control using the variable nozzle mechanism. Conversely, when the deviation is small, the boost-pressure control means gives a higher priority to the boost-pressure control using the variable nozzle mechanism than to the boost-pressure control usin the motor.</p> |
