| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately estimate a deposit peeling amount or a deposit deposition amount in the vicinity of a fuel injection hole. <P>SOLUTION: In an internal combustion engine provided with a fuel injection valve 22, a deposit peeling amount is estimated by calculating the deposit peeling amount using a plurality of parameters representing factors affecting deposit peeling force as force to peel, from an injection hole wall surface, at least a part of deposit deposited on the injection hole wall surface of a fuel injection hole 34. At least one parameter of the plurality of parameters is a parameter representing a factor for varying the deposit peeling force, and at least other one parameter of the plurality of parameters is a flow coefficient Cd related to fuel flowing in the fuel injection hole, or a parameter θs, Ls, dQ, or QR having correlation with the flow coefficient. <P>COPYRIGHT: (C)2013,JPO&INPIT |
