Patent ID: 8285471
Filing Date: 2012-10-09
Classification: F02D,F02M,Y02T

Abstract:
1. A data storage device comprising: a calculating means for calculating a bulk modulus of fuel injected from a fuel injector of an internal combustion engine; a determining means for determining whether a change amount of the calculated bulk modulus per unit time increases and exceeds a predetermined amount; a learning means for learning a characteristic value, which indicates an injection characteristic of the fuel injector and which takes different values according to the bulk modulus of the actual fuel; and a storing means, wherein the determination result of the determining means or the value of the bulk modulus is stored in the storing means at the time when a change amount of the characteristic value per unit time learned by the learning means increases and exceeds a predetermined amount, and a change amount of the calculated bulk modulus per unit time increases and exceeds a predetermined amount.