Electrical fuel injection control system for internal combustion engines

Claim 1

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, said detecting means including at least a sensor for detecting a negative pressure in the air intake manifold of the engine and producing an output voltage representation of said negative pressure, A pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the output voltages of said means in response to the application of these output voltages, and means for sequentially, distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising first means for producing a voltage delayed by a predetermined delay time from the output voltage of said negative pressure sensor, second means for producing an output voltage upon diffrentially comparing said output voltage of said negative pressure sensor with said delayed voltage, and third means for applying the output voltage of said second means as an additional input signal to said pulse modulator to further increase the pulse width signal from said modulator.

Claim 2

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, said detecting means including at least a sensor for detecting a negative pressure in the air intake manifold of the engine and producing an output voltage representation of said negative pressure, A pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the output voltages of said means in response to the application of these output voltages, and means for sequentially, distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising first means for producing a voltage delayed by a predetermined delay time from the output voltage of said negative pressure sensor, second means for producing an output voltage upon diffrentially comparing said output voltage of said negative pressure sensor with said delayed voltage, and third means for applying the output voltage of said second means as an additional input signal to said pulse modulator to further increase the pulse width signal from said modulator.

Claim 4

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially, distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an mount corresponding to the pulse width of said pulse signal; said system comprising first means for detecting a variation relative to time of the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time and producing a voltage signal representative of said rate of variation of the negative pressure, and third means for applying said voltage signal as an additional input to said pulse modulator, and in which said means for delivering the voltage representative of the variation relative to time of the negative pressure in the air intake manifold includes a differential amplifier which delivers a voltage representing the difference between a first voltage representative of the negative pressure in the air intake manifold and a second voltage delayed by a predetermined delay time from said first voltage.

Claim 5

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially, distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an mount corresponding to the pulse width of said pulse signal; said system comprising first means for detecting a variation relative to time of the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time and producing a voltage signal representative of said rate of variation of the negative pressure, and third means for applying said voltage signal as an additional input to said pulse modulator, and in which said means for delivering the voltage representative of the variation relative to time of the negative pressure in the air intake manifold includes a differential amplifier which delivers a voltage representing the difference between a first voltage representative of the negative pressure in the air intake manifold and a second voltage delayed by a predetermined delay time from said first voltage.

Claim 6

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, said detecting means including at least a sensor for detecting a negative pressure in the air intake manifold of the engine and producing an output voltage representative of said negative pressure, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the output voltages of said means in response to the application of these output voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresPonding to the pulse width of said pulse signal; said system comprising first means for producing a voltage delayed by a predetermined delay time from the output voltage of said negative pressure sensor, second means for producing an output voltage upon differentially comparing said output voltage of said negative pressure sensor with said delayed voltage, third means for comparing the output voltage of said second means with a predetermined reference voltage and producing a given voltage signal when said output voltage of said second means is higher than said reference voltage, fourth means for differentiating said given voltage signal of said third means to produce a pulse, and fifth means for producing a pulse signal having a predetermined duration of time responsive to said pulse produced by said fourth means upon differentiation of said given voltage signal, said pulse signal being applied to the solenoid operated fuel injection valves.

Claim 7

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, said detecting means including at least a sensor for detecting a negative pressure in the air intake manifold of the engine and producing an output voltage representative of said negative pressure, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the output voltages of said means in response to the application of these output voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresPonding to the pulse width of said pulse signal; said system comprising first means for producing a voltage delayed by a predetermined delay time from the output voltage of said negative pressure sensor, second means for producing an output voltage upon differentially comparing said output voltage of said negative pressure sensor with said delayed voltage, third means for comparing the output voltage of said second means with a predetermined reference voltage and producing a given voltage signal when said output voltage of said second means is higher than said reference voltage, fourth means for differentiating said given voltage signal of said third means to produce a pulse, and fifth means for producing a pulse signal having a predetermined duration of time responsive to said pulse produced by said fourth means upon differentiation of said given voltage signal, said pulse signal being applied to the solenoid operated fuel injection valves.

Claim 9

A system for electrically controlling fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising a first means for detecting the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time, thereby producing a signal representative of said rate of variation of the negative pressure, and third means including a pulse generator for generating a pulse signal of a predetermined duration when said signal delivered from said second means exceeds a predetermined value so as to apply said pulse signal to said solenoid operated fuel injection valves simultaneously, and fourth means in which said first means for delivering the voltage representative of the variation relative to time of the negative pressure in the air intake manifold includes a differential amplifier which delivers a voltage representing the difference between a first voltage representative of the negative pressure in the air intake manifold and a second voltage delayed by a predetermined delay time from said first voltage.

Claim 10

A system for electrically controlling fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel injection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising a first means for detecting the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time, thereby producing a signal representative of said rate of variation of the negative pressure, and third means including a pulse generator for generating a pulse signal of a predetermined duration when said signal delivered from said second means exceeds a predetermined value so as to apply said pulse signal to said solenoid operated fuel injection valves simultaneously, and fourth means in which said first means for delivering the voltage representative of the variation relative to time of the negative pressure in the air intake manifold includes a differential amplifier which delivers a voltage representing the difference between a first voltage representative of the negative pressure in the air intake manifold and a second voltage delayed by a predetermined delay time from said first voltage.

Claim 12

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel inJection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising a first means for detecting the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time, thereby producing a signal representative of said rate of variation of the negative pressure, and third means including a pulse generator for generating a pulse signal of a predetermined duration when said signal of a predetermined duration when said signal delivered from said second means exceeds a predetermined value so as to apply said pulse signal to said solenoid operated fuel injection valves simultaneously, and in which said second means includes means for generating a pulse when the variation relative to time of the negative pressure in the air intake manifold exceeds a predetermined value, means responsive to said pulse to provide a voltage which increases with a predetermined time constant, and means for comparing the value of this voltage with the peak value of the voltage applied from said first means thereby generating a pulse during a period of time in which the former voltage value is smaller than the latter voltage value.

Claim 13

A system for electrically controlling the fuel injection in an internal combustion engine having means for detecting a plurality of parameters indicative of the operating conditions of the engine and delivering output voltages representative of the parameters, a pulse modulator connected to said means for generating a pulse signal having a pulse width corresponding to the sum of the input voltages in response to the application of these input voltages, and means for sequentially distributing the pulse signal delivered from said pulse modulator to solenoid operated fuel injection valves associated with individual cylinders of the engine in a predetermined order for causing said solenoid operated fuel inJection valves to inject fuel in an amount corresponding to the pulse width of said pulse signal; said system comprising a first means for detecting the negative pressure in the air intake manifold during the acceleration of the engine, second means for detecting the rate of variation of the negative pressure detected by said first means with respect to time, thereby producing a signal representative of said rate of variation of the negative pressure, and third means including a pulse generator for generating a pulse signal of a predetermined duration when said signal of a predetermined duration when said signal delivered from said second means exceeds a predetermined value so as to apply said pulse signal to said solenoid operated fuel injection valves simultaneously, and in which said second means includes means for generating a pulse when the variation relative to time of the negative pressure in the air intake manifold exceeds a predetermined value, means responsive to said pulse to provide a voltage which increases with a predetermined time constant, and means for comparing the value of this voltage with the peak value of the voltage applied from said first means thereby generating a pulse during a period of time in which the former voltage value is smaller than the latter voltage value.