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    • 4. 发明专利
    • JPS5759416B2
    • 1982-12-14
    • JP5868081
    • 1981-04-20
    • ANDEYUSUTORIERU DO BURUBE E DECHUUDO ESU I BE U SOC
    • FURANSOWA HOORU MANNUSON
    • F02D41/34F02D41/18
    • The device comprises, in its intake pipe, a principal throttle member actuated by the driver, a source of fuel under pressure of which the delivery pipe which opens into the portion of the intake pipe situated downstream of the principal throttle member is controlled by at least one injection valve actuated by an electromagnet and a metering system which, provided with a rotary member driven in continuous rotation, is adapted to send into this electromagnet at least one energizing signal during a fraction of each revolution of said rotary member, regulated by this system. Electronic means supply a signal representing the measurement of the degree of opening of an auxiliary throttle member as a function of the variation in the flow-rate of air and a trigger signal appearing at each revolution of the rotary member. The electronic means comprise means for emitting, on each revolution of the rotary member, a first and a second saw-tooth signal, the saw-tooth of the second signal, in the course of one revolution of the rotary member, being triggered by the trigger signal and appearing after the saw-tooth of the first signal, this saw-tooth of the second signal having in addition a steeper slope than the slope of said saw-tooth of the first signal, the period t of this saw-tooth of the first signal corresponding substantially to the duration of a revolution of the rotary member, one of these saw-tooth signals having a slope variable as a function of the signal representative of the degree of opening of the auxiliary throttle member and the other of these two saw-tooth signals having a generally constant slope. The electronic means includes a comparator to determine the fraction of each revolution of the rotary member which corresponds to the time that elapses between the beginning of the appearance of the saw-tooth of steepest slope and the moment when the amplitude of this saw-tooth reaches that of the saw-tooth of the other signal. The electronic means is arranged so that the duration t of this fraction of a revolution is the duration of the energizing signal to be supplied to the electromagnet of the injection valve for each revolution of the rotary member.