METHOD OF MEASURING CETANE NUMBER OF FUEL FOR INTERNAL COMBUSTION ENGINE

• Main Authors: INAGAKI KAZUHISA, AOYAMA TARO
• Format: Patent
• Language: English
• Published: 15.12.2005
• Edition: 7
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a technique for highly accurately measuring a cetane number of fuel, while the fuel is used for operating an internal combustion engine. SOLUTION: Pressure P in a combustion chamber is detected by a pressure detecting means, and volume V of the combustion chamber is detected by a volume detecting means. When a value near a ratio of specific heat of air-fuel mixture is a constant κ, a product PVκis calculated as a heat generation parameter, by multiplying the pressure P by a value obtained by getting the volume V raised to the κth power. In a rated operational state of the internal combustion engine, the cetane number of the fuel is measured based on variation in the heat generation parameter PVκafter the fuel is injected into the combustion chamber. COPYRIGHT: (C)2006,JPO&NCIPI