Method and apparatus for injecting fuel into a combustion chamber of an air compressing, spontaneous ignition, internal combustion engine

In a method of injecting fuel into a combustion chamber of an air compressing, spontaneous ignition, internal combustion engine, with an adjustment member of an injector being actuated electrically and being controlled via an electronic circuitry, with the fuel quantity being withdrawn from a pressure chamber, the improvement wherein:

• said adjustment member acts upon a release sectional area of a restrictor means;
• an adjustment member in the form of a magneto strictive rod is provided;
• said release sectional area is controlled by a control voltage, generated by said electronic circuitry, and can be chronologically modulated;
• and
• said chronologically modulation of the movement sequence of said adjustment member is effected in black-and-white cycles, whereby during such cycle an injected fuel quantity can be determined by varying the ratio of opening duration to pulse interval in such a way that the injection process, which is periodically modulated and is continual over the entire injection duration, has a chronological progress of said ratio of opening duration to pulse interval as defined by the linear equation U=U.sub.0 +m.multidot.t as the control voltage for movement sequence of said adjustment member, with U.sub.o being proportional to said ratio of opening duration to pulse interval, and m representing the slope of said control voltage line.