ELECTRONIC FUEL CONTROL SYSTEM INCLUDING MEANS FOR PROVIDING A CONTINUOUS VARIABLE CORRECTION FACTOR

摘要

Refinements in fuel control systems for internal combustion engines of the type having sensing organs responsive to engine conditions to produce signals indicative of respective functional parameters, including means for generating signals of firing actions indicative of the occurrence of actions periodic recurring mechanics, a computing organ responsive to signals from the sensing organs to produce a fuel feed command signal indicative of the engine's need for fuel, and fuel delivery means responsive to the fuel command signal fuel to supply fuel to the engine in relation to said command signal, said computing member comprising: at least two operating current sources to generate first and second electric currents of a predetermined magnitude; an accumulator circuit having at least one accumulator element for receiving said accumulation currents and electrical signals in response thereto; a current switching network for consecutively applying said currents to said at least one accumulator element in response to trip action signals, said first current being applied to said at least one accumulator element for a period of time immediately following the mechanical action signal indicative of a first trip action and said second current being applied to said at least one accumulator element in response to a selected successive trip action signal; and a threshold circuit coupled to said at least one accumulator element responding to the accumulated electrical signal therein to generate an output signal for the period of time following the selected successive trip action signal, than the accumulated electrical signal maintains a selected ratio at a predetermined threshold value; characterized in that a control circuit coupled to said electrical accumulator circuit is provided and operative to establish limit values for the electrical signal accumulated by said at least one accumulator element in response to said first current, said control circuit comprising; a plurality of reference level setting bodies responsive to at least two externally produced signals, each of which occurs at different predetermined time periods following said first trigger signal, and operative to produce respective output signals, each of which defines a specific limit value for the electrical signal accumulated by said at least one accumulator element discharge elements of electrical signals responsive to said respective output signals to discharge said at least one accumulator element to the limit values defined by said respective output signals ; and a regulating member responsive to the electrical signal accumulated by at least one accumulating element when it successively reaches said limit and operating values to interrupt the operation of said electrical signal discharge members. (Machine-translation by Google Translate, not legally binding)