| 摘要 |
A fuel injection nozzle for internal combustion engines having an inwardly opening valve needle (I nozzle) is proposed, in which an induction coil is disposed in the closing spring chamber, the induction coil together with an armature influenced by the valve needle forming a signal transducer for a measuring appliance for detecting the onset of injection and further data, as needed, of the injection process. The air gap of the magnetic circuit of the induction coil is formed between the armature and a coil, toward which the armature moves during the opening stroke of the valve needle. As a result, it is possible to attain a small initial air gap and a large change, in terms of percentage, in the air gap. The apparatus according to the invention is particularly suitable for measuring circuits in which a direct voltage is applied to the induction coil and the voltages induced as a result of the air gap changes in the induction coil are superimposed on the applied direct voltage.
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