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US 4,718,386 AGranted
Fuel injector
AssigneeVolvo Car Corporation
InventorWilhelmus T. M. Gieles
Life of this patent
Estimating the term…
Abstract
A fuel injector comprising an injector body having a cylindrical bore containing a plunger connected to a moving part of an electromagnetic drive system, and is provided with a detector for the plunger displacement the moving part of the drive system being formed by a cylindrical winding positioned in the annular air gap of the magnetic circuit of the drive system.
Claims4
A fuel injector comprising
- an injector body having a cylindrical bore therein, a fuel supply passage communicating with the bore;
- a plunger contained within and movable in the longitudinal direction through the bore;
- a cylindrical winding, the plunger being connected to the winding;
- a permanent magnet circuit, including an annular air gap and the winding being positioned in the air gap, a controlled power source for supplying a current with a pulse shaped wave form, the power source being connected with the winding for supplying current to the winding, the power source including a control circuit, the power source further comprising a plunger displacement connector comprised of a permanent magnet and a magneto-resistive sensor, one part of the combination being stationary and the other part of the combination being coupled to the plunger for being moved by movement of the plunger, the output signal of the sensor being supplied as a feedback signal to the power source control circuit for controlling the power source.
1 more element
Dependencies are inferred from the claim text.