To provide a failure determination apparatus of a fuel supply system, the apparatus capable of precisely determining the presence of leakage failure based on the lowering of a fuel pressure.
An apparatus is applied to a fuel supply system having a common rail and fuel injection valves arranged in each of cylinders and respectively connected to the common rail and determines fuel leakage failures of the fuel supply system. The apparatus has pressure sensors arranged in each of the cylinders for detecting a fuel pressure PQ in a site between a site of a fuel injection valve side more than the common rail and injection hole of the fuel injection valves inside of the fuel supply system. This apparatus detects, during a detection period from an intermediate timing (time point t11) between respective compression top dead center timings of two of the cylinders that are successive to each other in ignition sequence to a timing (time point t12) immediately before the start of fuel injection into that one of those cylinders which is later in ignition sequence, a fuel pressure PQ by a pressure detection sensor that is provided in a manner corresponding to the cylinder that is later in ignition sequence, and determines, on the basis of a speed of decrease in the detected fuel pressure PQ, whether there has occurred an failure of fuel leakage.
ITO YOSHIYASU
SUZUKI AKIRA
KAWASAKI YUSUKE
IN CHUSEI
ARITA NAOKI
DENSO CORP
| JPH06213051A | 1994-08-02 | |||
| JP2000274297A | 2000-10-03 | |||
| JP2009085164A | 2009-04-23 | |||
| JP2010216279A | 2010-09-30 | |||
| JP2011127549A | 2011-06-30 | |||
| JP2011185158A | 2011-09-22 | |||
| JP2012002177A | 2012-01-05 |
| GB2311817A | 1997-10-08 | |||
| EP1039117A2 | 2000-09-27 |
Makoto Onda
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