| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device capable of acquiring rotation speed of rotary shaft of a turbocharger without providing a rotation speed sensor on the turbocharger in an internal combustion engine provided with the turbocharger supercharging suction air. SOLUTION: A throttle valve 13 is provided in a suction pipe 11 in the engine 10 and a suction pressure sensor 14 detecting suction pressure is provided in a downstream thereof. A atmospheric pressure sensor 16 is provided on the most upstream part of the suction pipe 11, and the turbocharger 20 is provided in a downstream thereof. In this structure, an engine ECU 30 calculates rotation speed of the rotary shaft of the turbocharger 20 based on inlet pressure and outlet pressure of the turbocharger 20. Atmospheric pressure detected by the atmospheric pressure sensor 16 is defined as inlet pressure here. Also, pressure change in the suction pipe 11 in a downstream of the turbocharger 20 is modeled and outlet pressure is calculated from suction pressure detected by the suction pressure sensor 14 by using reverse model thereof. COPYRIGHT: (C)2008,JPO&INPIT
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