コモンレール用比例制御形電子燃料噴射弁の特性に関する研究 : 第2報, タンデム形超磁歪アクチュエータによる制御特性

概要

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A high-pressure common rail injection system with controllable injection rate has a high potential for reducing exhaust emissions. This system requires an injector which controls suitable injection rate for various engine load and speed. Conventional electric controllable injectors energized by on/off switching pilot valves, which are difficult to control the injection rate continuously. This paper has developed a new type electric controllable fuel injector to satisfy the requirement of such enhanced features. It consists of a main needle valve with a position feedback slot, and a 2-way pilot valve driven by a tandem-type giant-magnetostrictive linear actuator. In proportion to the pilot valve operation, this injector can control the transient characteristics of injection rate by the internal hydraulic position feedback mechanism insensitively to disturbances. In this paper, design strategies of the injector and giant-magnetostrictive actuator, and test results of variable injection rate control at the common rail pressure of 160 MPa are described.
一般社団法人日本機械学会の論文
2000-07-25