Patent ID: 7556030
Filing Date: 2009-07-07
Classification: F02D,F02M,Y02T

Abstract:
1. A spark-ignition type internal combustion engine, comprising: a main tank for storing a to-be-determined fuel having an unknown self-ignition property; an auxiliary tank for accumulating a reference fuel having a known self-ignition property; and a controller programmed to: supply to a combustion chamber a blended fuel prepared by blending the to-be-determined fuel and the reference fuel at a predetermined ratio; measure a self-ignition property of the blended fuel; determine the unknown self-ignition property of the to-be-determined fuel based on the measured self-ignition property of the blended fuel, the known self-ignition property of the reference fuel and the ratio of the blended fuel; and introduce the to-be-determined fuel after the determination from the main tank to the auxiliary tank, and store the to-be-determined fuel in the auxiliary tank such that the to-be-determined fuel serves as a next reference fuel having a known self-ignition property.