Nippondenso Co., Ltd.

Hitoshi Ichikawa

Kazushi Akutsu

Hiroyuki Fujii

Toshihiro Imai

A block of material used for making a movable core for a fuel injector is prepared from a bar or coil of material by clamp shearing using a working fluid containing an extreme-pressure additive (such as sulfur, chlorine or phosphorus). The additive reacts with the material to form a protective layer (of e.g. sulfide, chloride or phosphate) on the cut-off surface of the block. The block is cold forged so that its cut-off surface having the protective layer may form a wall defining a fuel passage. The layer prevents the material from being seized with any die or punch used for cold forging.

Method of manufacturing a fuel injector core

A correction apparatus for an azimuth calculation system which includes an azimuth sensor mounted on a moving body for producing two mutually perpendicular magnetic field components relative to the earth's magnetism acting thereon, and wherein the azimuth sensor is moved in a full circle so that an azimuth circle is formed by the two magnetic field components. The correction apparatus is arranged to store a plurality of interspaced X-axis lines in parallel with the abscissa of a right-angled coordinate and a plurality of interspaced Y-axis lines in parallel with the ordinate of the coordinate, to determine maximum and minimum values respectively defined by intersections of the azimuth circle with the X-axis lines and maximum and minimum values respectively defined by intersections of the azimuth circle with the Y-axis lines, to determine first and second center values of the azimuth circle based on each mean value of the first-named maximum and minimum values and the second-named maximum and minimum values, to correct the magnetic field components respectively in accordance with the first and second center values, and to calculate a direction of the moving body on a basis of the corrected magnetic field components.

Correction apparatus for an azimuth calculating system

An azimuth calculation apparatus includes an azimuth sensor mounted on a moving body for detecting a direction of the moving body, the azimuth sensor having an excitation winding wound on an annular magnetic core and a pair of output windings wound on the core perpendicularly relative to one another to produce first and second output signals therefrom in response to energization of the excitation winding. The calculation apparatus is arranged to detect a temperature of the azimuth sensor and to determine a pair of correction values based on the detected temperature of the azimuth sensor so as to correct each value of the first and second output signals from the output windings to an optimal value for calculating the direction of the moving body in dependence upon the corrected output signals from the output windings.

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Kariya, Japan

Hitoshi Ichikawa