| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an abnormality diagnostic device of a pressure sensor and an accumulator fuel injection device, surely detecting abnormality of the pressure sensor equipped on a common rail without involving addition of parts even during operation of an internal combustion engine. <P>SOLUTION: The abnormality diagnostic device of the pressure sensor for diagnosing the existence and nonexistence of abnormality in the pressure sensor for detecting pressure in the common rail includes: a non-injection condition detecting means; an engine rotation speed detecting means; a pressure detecting means calculating detected pressure based on a sensor signal of the pressure sensor when in a non-injection condition; a minute injection performance control means calculating, based on the detected pressure, an injection time for obtaining minute injection of a predetermined quantity and performing the minute injection when in the non-injection condition; and an abnormality determination means determining the pressure sensor to have abnormality when a difference between a variation of engine rotation speed when performing the minute injection and a reference variation of the engine rotation speed caused by the minute injection stored beforehand is equal to or larger than a predetermined threshold value. <P>COPYRIGHT: (C)2011,JPO&INPIT |
