Fuel-injection system for engines

Details Fuel-injection system for engines Fuel-injection system for engines

1999-03-24

2000-04-25

Miller, Carl S.

Internal-combustion engines

Charge forming device

With fuel pump

123458, 123300, F02M 3704

Patent

active

060531509

ABSTRACT:
A fuel-injection system for an engine is disclosed for accomplishing a minute fuel injection by learning the minimum conductive duration to electronic devices for the beginning of the minute fuel injection. A controller unit may output at a time Tp a command pulse of an actuating current that is applied to solenoid-operated valves to make injectors to carry out the fuel injection. After a definite length of time T.sub.0 has elapsed, a common rail pressure begins decreasing from a mean value P.sub.0, which is kept until then. The controller unit changes incrementally the conductive duration Pwp of the command pulse for a pilot injection from the minimal conductive duration, and identifies the timing of the beginning of the fuel injection with the timing when an area Ar of pressure reduction is over a preselected value. In case the desired amount of fuel to be injected is too minute, the controller unit may calculate the conductive duration dependently on the minimum command pulse width.

REFERENCES:
patent: 4788960 (1988-12-01), Oshizawa
patent: 5462032 (1995-10-01), Nakamura
patent: 5485820 (1996-01-01), Iwaszkiewicz
patent: 5678521 (1997-10-01), Thompson
patent: 5778852 (1998-07-01), Penteker
patent: 5848581 (1998-12-01), Hirose
patent: 5954030 (1999-09-01), Sturman
patent: 5957111 (1999-09-01), Rodier
patent: 5988143 (1999-11-01), Dietz

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