F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
F02M 63/00 (2006.01) F02D 41/38 (2006.01)
Patent
CA 2412758
When a redundant mechanism having two pressure regulating ,valves for covering one of the pressure regulating valves when the other one is in the defective conditions is provided, to enable quick recognition of the defective side when one of them are in the defective operating conditions. A first and second pressure regulating valves 20, 21 are provided as pressure regulating means 4 of the fuel injection circuit and connected to the reflux passage 3 and the by-pass passage 29 that communicates with the fuel injection passage 2 via the first and the second orifices 22, 27 respectively; and a first and second sensors 24, 28 for detecting the fuel pressure applied on the respective pressure regulating valves separately are provided. A controller 31 of failure diagnostic means 30 compares the fuel pressures P1, P2 detected by the first and second sensors 24, 28 and the predetermined fuel pressure P in the fuel injection passage 2, and if P1=P2, both of the first and the second pressure regulating valves 20, 21 are determined to be normal. When the defective operating condition ; occurs in one of the pressure regulating valves, P1 and P2 vary. Therefore, it is determined to be abnormal based on the differential pressure, and the occurrence of an abnormal condition and the place where the abnormal conditions occurred are notified through a display 33.
Niimi Atsushi
Uruno Hiroshi
Dennison Associates
Honda Giken Kogyo Kabushiki Kaisha .)
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