Position sensor for fuel injection apparatus
First Claim
1. A sensor assembly for detecting the position of a fuel injection device in a fuel injection apparatus of an internal combustion engine, said sensor comprising:
- an integrated circuit sensing element;
a lead frame assembly having a plurality of leads of a predetermined length;
electrically conductive means attaching contact pads on said integrated circuit sensing element to corresponding ones of said leads;
first encapsulating means about said sensing element and a portion of said leads, said first encapsulating means forming projections above a surface of said sensing element;
a multi-lead wire having a plurality of lead wires, each of said lead wires having an end attached to a corresponding one of said leads of said lead frame assembly; and
second encapsulation means about said sensing element, said lead frame assembly and said end of said multi-lead wire forming said sensor assembly, a face of said sensor assembly being coterminous with peaks of said projections.
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Accused Products
Abstract
A sensor assembly for detecting the position of a fuel injection element such as a needle injector, poppet valve or the like in fuel injection apparatus of an internal combustion engine includes a lead frame assembly having a plurality of leads of a predetermined length and a Hall-effect sensing device mechanically and electrically connected to contact surfaces associated with the leads. A first encapsulation layer is formed about the contact surfaces and Hall-effect device utilizing a mold process which results in the formation of projections above the surface of the Hall-effect device in the area adjacent the electrical contacts. The leads of the lead frame assembly are bent perpendicularly to the plane of the Hall-effect device and attached to a multi-lead wire. The assembly is encapsulated in a second mold using the projections as positive stops to position the assembly in the mold. An end of the multi-lead wire, the leads and the Hall-effect device are all thereby encapsulated and dimensioned for insertion into and out of a passageway and fuel injection apparatus.
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Citations
20 Claims
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1. A sensor assembly for detecting the position of a fuel injection device in a fuel injection apparatus of an internal combustion engine, said sensor comprising:
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an integrated circuit sensing element; a lead frame assembly having a plurality of leads of a predetermined length; electrically conductive means attaching contact pads on said integrated circuit sensing element to corresponding ones of said leads; first encapsulating means about said sensing element and a portion of said leads, said first encapsulating means forming projections above a surface of said sensing element; a multi-lead wire having a plurality of lead wires, each of said lead wires having an end attached to a corresponding one of said leads of said lead frame assembly; and second encapsulation means about said sensing element, said lead frame assembly and said end of said multi-lead wire forming said sensor assembly, a face of said sensor assembly being coterminous with peaks of said projections. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A sensor assembly for detecting the position of valve means in fluid control apparatus, of a fuel injection apparatus, said sensor assembly comprising:
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an integrated circuit sensing element; a lead frame assembly having a plurality of leads; electrically conductive means attaching contact pads on said integrated circuit sensing element to corresponding ones of said leads; and encapsulation means formed about said sensing element and a portion of said leads, said encapsulation means forming projections above a surface of said sensing element, peaks of said projections defining a plane for positioning said sensing element a predetermined distance from an end surface of said sensor. - View Dependent Claims (17, 18, 19, 20)
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Specification