Patent ID: 8869605
Filing Date: 2014-10-28
Classification: F01N,F02D,F02M,Y02T

Abstract:
1. A deposit amount estimation device of an internal combustion engine comprising: a fuel injector having a first wall face defining a fuel injection hole of said fuel injector, a second wall face of said fuel injector adjacent to an inlet of said fuel injection hole other than said first wall face and a third wall face of said fuel injector adjacent to an outlet of said fuel injection hole other than said first wall face; a first injection performing part for performing a first injection for injecting a fuel from said injector, a required fuel injection amount of said first injection being larger than or equal to a predetermined amount; and a second injection performing part for performing a second injection for injecting the fuel from said injector, a required fuel injection amount of said second injection being smaller than said predetermined amount, wherein the device comprises: an estimation part for estimating a deposit amount which is an amount of a deposit on at least one of said first to third wall faces on the basis of an injection amount difference which is a difference between an actual fuel injection amount of said second injection and said required fuel injection amount of said second injection when said actual fuel injection amount of said second injection is larger than said required fuel injection amount of said second injection.