Method for controlling drive of injector for internal combustion

Details Method for controlling drive of injector for internal combustion Method for controlling drive of injector for internal combustion

1997-11-24

1999-08-24

Kwon, John

Internal-combustion engines

Charge forming device

Fuel injection system

361154, F02M 5100

Patent

active

059412160

ABSTRACT:
A method for controlling drive of an injector for an internal combustion engine which is capable of reducing a minimum injection quantity available for the control to increase a dynamic range of the injector is disclosed. A voltage across a solenoid coil is stepwise increased when a drive pulse is generated, so that a current fed to the solenoid coil is increased to a level higher than that of the drive current at the time when an injection valve starts port opening operation. Then, the drive current is gradually reduced toward a hold value required to hold the injection valve at a port opening position at a time-based variation ratio less than that of the drive current at the time when the voltage across the solenoid coil is stepwise decreased from a peak value, so that the voltage is stepwise reduced at the time when the drive pulse is extinguished, resulting in the drive current being extinguished.

REFERENCES:
patent: 5452700 (1995-09-01), Matsuura
patent: 5515830 (1996-05-01), Arakowa
patent: 5558065 (1996-09-01), Arakawa

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