Apparatus for controlling the operating current of electromagnet

Details Apparatus for controlling the operating current of electromagnet Apparatus for controlling the operating current of electromagnet

1977-03-28

1979-12-25

Myhre, Charles J.

Internal-combustion engines

Noncompression

361154, F02M 5100, H01F 718

Patent

active

041800265

ABSTRACT:
Electronic control circuitry is provided for controlling the actuating current of electromagnetic devices and in particular of the electromagnetic fuel injection valves of an internal combustion engine. In order to program the magnitude of the actuating current from an initial high level to a lower maintenance level, there is provided a driver circuit which receives fuel injection control pulses from a fuel injection system, not itself part of the invention, and processes these control pulses into valve-actuating current pulses. The valve current is sensed by suitable transducer, for example a resistor, and the resulting signal is fed to a two-point controller which suitably alters the input to the driver circuit to thereby change the valve actuating current. The set-point value on which the two-point controller operates is itself subject to change by means of a suitable circuit. There is further provided a free-running circuit and a quenching circuit for reducing the voltage peaks resulting from the collapse of the magnetic fields stored in the valve actuating coils. Two embodiments are presented.

REFERENCES:
patent: 2934050 (1960-04-01), Pribble
patent: 3665901 (1972-05-01), Monpetit et al.
patent: 3682144 (1972-08-01), Suda
patent: 3768449 (1973-10-01), Lindberg
patent: 3786314 (1974-01-01), Misch
patent: 3786344 (1974-01-01), Davis et al.
patent: 3889162 (1975-06-01), Myers
patent: 3896346 (1975-07-01), Ule
patent: 4078528 (1978-03-01), Hoshi

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