FUEL FEED DEVICES FOR INTERNAL COMBUSTION ENGINES

专利名称：FUEL FEED DEVICES FOR INTERNAL

COMBUSTION ENGINES

申请号：AU4456072申请日：19720714公开号：AU469602B2公开日：19760219

摘要：The device comprises, in its intake pipe, a principal throttle member actuated bythe driver, a source of fuel under pressure of which the delivery pipe which opens into theportion of the intake pipe situated downstream of the principal throttle member iscontrolled by at least one injection valve actuated by an electromagnet and a meteringsystem which, provided with a rotary member driven in continuous rotation, is adapted tosend into this electromagnet at least one energizing signal during a fraction of eachrevolution of said rotary member, regulated by this system. Electronic means supply asignal representing the measurement of the degree of opening of an auxiliary throttlemember as a function of the variation in the flow-rate of air and a trigger signal appearingat each revolution of the rotary member. The electronic means comprise means foremitting, 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 firstsignal, this saw-tooth of the second signal having in addition a steeper slope than theslope of said saw-tooth of the first signal, the period t of this saw-tooth of the first signalcorresponding substantially to the duration of a revolution of the rotary member, one ofthese 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 twosaw-tooth signals having a generally constant slope. The electronic means includes acomparator to determine the fraction of each revolution of the rotary member whichcorresponds to the time that elapses between the beginning of the appearance of thesaw-tooth of steepest slope and the moment when the amplitude of this saw-toothreaches that of the saw-tooth of the other signal. The electronic means is arranged sothat the duration t of this fraction of a revolution is the duration of the energizing signalto be supplied to the electromagnet of the injection valve for each revolution of therotary member.

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