| 摘要 |
The present invention provides a common rail fuel injection device, by means of which it is possible to discharge air, which is entrained with fuel in the fuel supply path, from injectors, whilst avoiding any effect on the combustion characteristic, by adopting an existing common rail fuel injection device to which no changes have been made. When common rail pressure Pr is predetermined pressure Prai, which is low such that it is lower than the pressure for the initiation of fuel injection by the injectors (step 1), air-extraction pulse width Pwai, which is elected in accordance with a fixed value or the engine rotation speed (step 6), is elected as the final pulse width Pwf (step 7). Also, since air that is entrained with fuel is discharged at low pressure, along with fuel, from the pressure control chamber of the injectors, via a open/close valve, which opens based on pulse width Pwai, and via a discharge path, it is possible to avoid the effect, on the combustion characteristic, that arises due to the injection of entrained air, along with fuel, from nozzle holes into the combustion chamber.
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