筒内噴射ガソリンエンジン用バッテリ電圧駆動インジェクタの開発 : 第2報, 高圧燃料噴射制御のための磁気吸引力増加検討

概要

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The battery-voltage-driven fuel injector for Direct-Injection Gasoline Engines has an opening coil and a holding coil which enable the injector to operate at the battery voltage, thus eliminating the need for either voltage-step-up circuitry or current-control circuitry. The aim of current work was to increase the magnetic force so as to increase the pressure of fuel injection. It is known that a large magneto-motive force, that is, the product of coil current and coil turn numbers, gives a large magnetic force. However, increased coil current produces more heat as a result. To overcome this problem, we have developed a new dual-coil driving method called the "double-hold driving method". This method enables the current to be fed to the opening coil during the valve holding period. The current is limited to a predetermined value by using a holding coil, which is connected in series to the opening coil, as a current-limitation register. We also inserted a diode into the drive circuit in order to block the reverse current flow caused by the mutual magnetic induction force of the two coils. Adding this diode increased the valve-opening force. It is thus concluded that the "double-hold driving method with a diode for preventing reverse current-flow" enables the injector to inject more highly pressurized fuel without any loss of injection controllability.
社団法人日本機械学会の論文
2001-09-25