Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-03-29
2005-03-29
Mohanty, Bibhu (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S445000, C123S446000
Reexamination Certificate
active
06871633
ABSTRACT:
Apparatus for diagnosing high pressure fuel system of a cylinder injection type engine includes fuel pump (18), spill valve (33), fuel injectors (15), fuel pressure sensor (19) and fuel pressure control means (30). A control period for the pump (18) covers an intake period and a discharge period. The discharge period covers spill valve closing period and spill valve opening period. Fuel pressure control means (30) includes spill valve control period setting means for adjusting spill valve closing/opening periods, abnormality decision period detecting means for detecting as abnormality decision period the spill valve opening period during the discharge period in the engine operation, pressure change arithmetic means for determining change of the fuel pressure (PF) on the basis of the abnormality decision period, and diagnosing means for deciding as to abnormality of the spill valve (33), based on the change of the fuel pressure (PF).
REFERENCES:
patent: 3817231 (1974-06-01), O'Neill
patent: 6394072 (2002-05-01), Yoshida et al.
patent: 04-109052 (1992-10-01), None
patent: 06-213051 (1994-02-01), None
patent: 10-9028 (1998-01-01), None
patent: 11-82134 (1999-03-01), None
Date Toshiaki
Oono Takahiko
Mitsubishi Denki & Kabushiki Kaisha
Mohanty Bibhu
Sughrue & Mion, PLLC
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