| US 7,487,762 B2 | ||
| Fuel injection system for internal combustion engine | ||
| Takashi Kaneko, Sagamihara (Japan) | ||
| Assigned to Mitsubishi Heavy Industries, Ltd., Tokyo (Japan) | ||
| Filed on Mar. 31, 2005, as Appl. No. 11/94,082. | ||
| Claims priority of application No. 2004-108154 (JP), filed on Mar. 31, 2004. | ||
| Prior Publication US 2005/0217638 A1, Oct. 06, 2005 | ||
| Int. Cl. F02M 37/04 (2006.01); F02M 37/06 (2006.01) | ||
| U.S. Cl. 123—508 | 8 Claims |
| 1. A fuel injection system for an internal combustion engine comprising:
a fuel injection apparatus for pressurizing low-viscosity fuel by using a plunger of the fuel injection apparatus to feed
pressurized fuel to a fuel injection nozzle;
a lubricity improver tank for holding a lubricity improver;
a fuel tank for holding the low-viscosity fuel;
a fuel supply pump for supplying the low-viscosity fuel from said fuel tank to said fuel injection apparatus;
a lubricity improver supply means for supplying lubricity improver from said lubricity improver tank to the low-viscosity
fuel from said fuel tank upstream of said fuel injection apparatus; and
a controller for controlling said lubricity improver supply means so that (1) the amount of lubricity improver added to the
low-viscosity fuel increases as engine speed, engine load or injection pressure increases, and (2) the amount of the lubricity
improver that is added to the low-viscosity fuel is controlled in response to an increase in the amount of the lubricity improver
that is in said fuel tank due to partial return of the low-viscosity fuel containing the lubricity improver to said fuel tank
from said fuel injection apparatus.
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