| 摘要 |
PURPOSE:To enable to omit a pressure sensor to be provided at an upstream side of compressor, by obtaining a concentration suction air from a pressure difference of an air cleaner between its upstream and downstream as preset, its pressure difference and a resultant function relative to an internal pressure of suction air tube, in a fuel injection quantity control device of internal combustion engine using a turbocharger. CONSTITUTION:A pressure sensor 7 detects a pressure PB of a downstream side of a throttle valve TL adapted to throttle a suction air tube of an engine, whereas a pressure sensor 10 detects an internal pressure P2 of a suction air tube at an intermediate position between a compressor outlet and the throttle valve TL. Obtained therein are a pressure difference P1' of an air cleaner between its upstream and a downstream sides as preset and its pressure difference P1 relative to an atmospheric pressure Po'. A suction air density correcting factor is obtained as a function of these pressure differences P1 and P2 and suction air temperature T1. In this manner, it si made possible to omit a pressure sensor which would be otherwise required to be provided at an upstream side of the compressor. |
