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Title:
METHOD AND SYSTEM FOR CONTROLLING FUEL INJECTION PULSE WIDTH BASED ON FUEL TEMPERATURE
Document Type and Number:
Japanese Patent JPH10176580
Kind Code:
A
Abstract:

To improve injection performance by generating fuel feed control signals of fuel injectors as the function of the desired fuel mass to be injected, determining the temperatures of the fuel approaching the fuel injectors on a fuel rail, and adjusting the pulse widths of the fuel feed control signals for individual injectors.

Fuel is injected to an engine cylinder from fuel injectors 20-25 arranged along a fuel rail 28, and the excess fuel 29 not injected to the cylinder is return to a fuel tank 52 through a return pipe 64 via an outlet 60. The temperature of a fuel line 54 having the temperature T1 nearly equal to the temperature T2 at the inlet 56 of the fuel rail 28 is detected. The fuel temperatures T3-T8 near the fuel injectors 20-25 are estimated based on the prescribed engine structure and the fuel temperature T2 near the inlet 56 of the fuel rail 28, the pulse widths of the fuel feed control signals for the injectors 20-25 are adjusted in response to the estimated temperatures T3-T8, and the operating performance is improved.


Inventors:
Cleveland, Trent J.
Crowell, Thomas J.
Application Number:
JP1997000340987
Publication Date:
June 30, 1998
Filing Date:
December 11, 1997
Export Citation:
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Assignee:
CATERPILLAR INC
International Classes:
F02M51/00; F02D41/20; F02D41/30; F02D41/38; F02D41/40; F02D45/00; (IPC1-7): F02D41/20; F02D41/40; F02D45/00; F02M51/00
Attorney, Agent or Firm:
中村 稔 (外6名)