Fuel injection device in diesel engine
AssigneesToyota Jidosha Kabushiki Kaisha, Nippondenso Co., Ltd.
InventorsFumiaki Kobayashi, Mamoru Kobashi, Mamoru Takata, Masahiko Miyaki, Takashi Hasegawa
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Abstract
In controlling a fuel injection quantity by spilling a part of fuel fed from a high pressure chamber of a fuel injection pump using a high pressure electromagnetic valve which is on-off controlled by a driving circuit in accordance with engine operating conditions, switch means is provided between the high pressure electromagnetic valve and a power source, an output signal from the driving circuit is monitored, and the switch means is opened when the output signal from the driving circuit continues more than a predetermined period.
Claims9
A fuel injection device in a diesel engine wherein a fuel injection quantity fed to the engine is controlled by spilling a part of fuel fed from a high pressure chamber of a fuel injection pump using a high pressure electromagnetic valve, said valve being on-off controlled in accordance with the engine operating conditions, comprising:
- fuel cut means for cutting said fuel injection quantity fed to the engine;
- switch means provided between said high pressure electromagnetic valve and power source:
- a driving circuit provided between said high pressure electromagnetic valve and ground, for on-off controlling said electromagnetic valve;
- and
- trouble detecting means for monitoring a signal for driving said electromagnetic valve, and opening said switch means to keep said electromagnetic valve in a constantly deenergized condition and drive said fuel cut means to cut the fuel injection quantity fed to the engine when said electromagnetic valve is placed in an enegizing condition by said signal for driving said electromagnetic valve for more than a predetermined period.
Dependencies are inferred from the claim text.