| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine control device capable of precisely calculating an air-fuel ratio or/and an EGR rate using measurement data by a cylinder internal pressure sensor. <P>SOLUTION: An arithmetic processing device 20 calculates at least two types of combustion state quantities with different sensitivities about the air-fuel ratio or the EGR rate from among listed combustion state quantities on the basis of an output of a cylinder internal pressure sensor 5. The relationship between the at least two types of combustion state quantities as calculation objects and the air-fuel ratio and EGR rate is specified by performing experiments or the like, and stored in a memory of the arithmetic processing device 20 so that the relationship may be referred to. The arithmetic processing device 20 then calculates the air-fuel ratio or/and the EGR rate in a cylinder to which the cylinder internal pressure sensor 5 is attached, from the values of the calculated combustion state quantities on the basis of the relationship between the combustion state quantities and the air-fuel ratio and EGR rate stored in advance. <P>COPYRIGHT: (C)2012,JPO&INPIT |
