| 摘要 |
PROBLEM TO BE SOLVED: To provide a common rail type fuel injection system that can precisely estimate an injector static leakage and a fuel leakage by precisely estimating a temperature of fuel passing around a coil of a solenoid valve 12 of an injector 5. SOLUTION: A solenoid coil temperature is estimated with the use of a characteristic map prepared from a relation predefined by an experiment or the like between a solenoid coil resistance value and a solenoid coil temperature about the solenoid coil 24 of the solenoid valve 12 of the injector 5. A temperature of fuel passing about the coil of the solenoid valve 12 of the injector 5 is estimated with the use of a characteristic map or operation expression prepared from a relation predefined by an experiment or the like between such an estimated solenoid coil temperature and a temperature of fuel passing about the coil of the solenoid valve 12 of the injector 5. The estimated fuel temperature is reflected in subsequent engine control, and the estimated fuel temperature is reflected in computations of an injector static leakage and computations of a fuel leakage. COPYRIGHT: (C)2004,JPO
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