Common rail fuel injection device
AssigneeIsuzu Motors Limited
InventorKoichiro Yomogida
Life of this patent
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Abstract
This invention provides a common rail fuel injection device, which ensures the functions of pilot injection even at high fuel pressure in the common rails, by changing the injection end delay period of the pilot injection in accordance with the fuel pressure in the common rail. The period displacement ΔSOCp to be applied to the pulse start time of the pilot injection command pulse CPp, with respect to the top dead centre T7, is set to a timing that is advanced by the interval period Tint, pilot injection end delay period Tdpe and injection pulse width Pwp for pilot injection, with respect to the main injection start time T6.
Claims4
A common rail fuel injection device comprising:
- a common rail for accumulating pressurized fuel from a high-pressure fuel supply pump;
- a detecting means for detecting an operating state of an engine;
- and
- an injector for injecting fuel supplied from said common rail into a combustion chamber, said injector divides fuel injection into the main injection and the pilot injection with an interval period prior to said main injection, in accordance with an operating state of the engine detected by the detecting means;
- a controller for calculating command pulses and outputting drive signals corresponding to said command pulses to the injector,
- wherein said controller calculates the interval period prior to said main injection, a pilot injection end delay period from the pulse end of said pilot injection command pulse to the pilot injection end, and a period corresponding to pulse width of said pilot injection command pulse corresponding to said pilot injection quantity, in response to said operating state of the engine as detected by said detecting means,
- and said controller sets the pulse start time of said pilot injection command pulse by being advanced by said interval period, said pilot injection end delay period and said period corresponding to pulse width of said pilot injection command pulse from previously determined injection start time of said main injection.
Dependencies are inferred from the claim text.