To provide an internal combustion engine control device detecting the content of alcohol in fuel without depending on an alcohol sensor and correcting an air-fuel ratio into a target value in accordance with the detected content of alcohol.
A vehicle control system 1 includes an alcohol content estimating means, an air-fuel ratio changing means, a revolution speed variation detecting means, an alcohol content calculating means, and an air-fuel ratio correcting means. It detects the content of alcohol in fuel from a revolution speed variation when controlling the air-fuel ratio of an internal combustion engine to a stoichiometric, rich or lean value in accordance with an estimated value for the content of alcohol in fuel, and executes control to correct the air-fuel ratio into the target value in accordance with the detected content of alcohol. Thus, it can correct the air-fuel ratio into the target value in accordance with the calculated content of alcohol, even in an operation region where it cannot execute the F/B control of the air-fuel ratio using an A/F sensor, when no alcohol sensor exists or a trouble occurs.
COPYRIGHT: (C)2010,JPO&INPIT
| JPH0560003A | 1993-03-09 | |||
| JP2009079558A | 2009-04-16 | |||
| JPH11247674A | 1999-09-14 | |||
| JP2009002314A | 2009-01-08 |
Toshiyuki Hatta
High Yoshitaka Hayashi
Next Patent: INTERNAL COMBUSTION ENGINE CONTROL DEVICE