Electronic fuel injection apparatus for a fuel injection

Claim 2

An electronic control apparatus for a fuel injection system comprising: first means for generating a first signal representative of the flow of air supplied to an engine cylinder; second means for generating pulses in response to the engine rotation; third means for generating a second signal representative of the level of the quantity of oxygen in the engine exhaust gas; fourth means, responsive to said second signal, for generating a third signal representative of the integration of said second signal; fifth means, coupled to said first means and said fourth means, for generating a charging current in response to said first and third signals; sixth means, coupled to said second means and said fifth means, for discharging said charging current in response to said pulses generated by said second means; seventh means, coupled to said sixth means, for generating a fuel injection valve opening signal in accordance with the time requireD for said charging current to discharge by said sixth means; and eighth means, responsive to the pulses generated by said second means, for generating a pulse having a predetermined duration, for controlling the operation of said fourth means.

Claim 3

An electronic control apparatus according to claim 1, wherein said fourth means includes a comparing circuit which compares said second signal with a predetermined value and generates one of a positive and negative valued signal in dependence upon said second signal exceeding said predetermined value, and a charge-discharge circuit which integrates the output of said comparing circuit in response to said predetermined duration pulse generated by said eighth means.

Claim 4

An electronic control apparatus according to claim 2, wherein said eighth means comprises a monostable multivibrator.

Claim 5

An electronic control apparatus according to claim 2, wherein said fifth means includes a voltage divider network having at least two variable resistance means and an output terminal connected in series across a constant voltage source, the resistance value of one of said variable resistance means being varied in accordance with the voltage integrated by the charge-discharge circuit of said fourth means, and the resistance value of the other of said variable resistance means being varied in accordance with the value of said first signal representative of air flow, the charging current generated by said fifth means varying in response to the voltage at said output terminal.

Claim 6

An electronic control apparatus for a fuel injection system comprising: first means for generating a first signal representative of the flow of air supplied to an engine cylinder; second means for generating pulses in response to engine rotation; third means for generating a second signal representative of the quantity of oxygen in the engine enhaust gas; fourth means for storing or discharging a charge in response to the output of said third means; fifth means for storing a charge in response to the output of said first means; sixth means for discharging the charge stored by said fifth means through a resistance means, the value of which is dependent upon the output of said fourth means; seventh means for activating fuel injection valves in response to the output of said sixth means; and eighth means comprising a monostable multivibrator for operating said fourth means in response to the pulses generated by said second means.

Claim 7

An electronic control apparatus for a fuel injection system comprising: first means for generating a first signal representative of the flow of air supplied to an engine cylinder; second means for generating pulses in response to engine rotation; third means for generating a second signal representative of the quantity of oxygen in the engine enhaust gas; fourth means for storing or discharging a charge in response to the output of said third means; fifth means for storing a charge in response to the output of said first means; sixth means for discharging the charge stored by said fifth means through a resistance means, the value of which is dependent upon the output of said fourth means; seventh means for activating fuel injection valves in response to the output of said sixth means; and eighth means comprising a monostable multivibrator for operating said fourth means in response to the pulses generated by said second means.

Claim 8

An electronic control apparatus for a fuel injection system comprising: first means for generating a first signal representative of the flow of air supplied to an engine; second means for generating pulses in response to the engine rotation; third means for generating a second signal representative of the level of the quantity of oxygen in the engine exhaust gas; fourth means, responsive to said second signal, and coupled to said second means, for generating a third signal representative of the integration of said second signal; fifth means, coupled to said first means, said second means and said fourth means, for generating a fourth signal, a first component of which is representative of the storing of a charge over a first prescribed portion of said engine rotation, and a second component of which is representative of the discharging of said charge during a second prescribed portion of said engine rotation subsequent to said first prescribed portion, in response to said first and third signals; and sixth means, coupled to said fifth means and said second means, for generating a fuel injection valve opening signal in accordance with the duration of the second component of said fourth signal.

Claim 9

An electronic control apparatus for a fuel injection system comprising: first means for generating a first signal representative of the flow of air supplied to an engine; second means for generating pulses in response to the engine rotation; third means for generating a second signal representative of the level of the quantity of oxygen in the engine exhaust gas; fourth means, responsive to said second signal, and coupled to said second means, for generating a third signal representative of the integration of said second signal; fifth means, coupled to said first means, said second means and said fourth means, for generating a fourth signal, a first component of which is representative of the storing of a charge over a first prescribed portion of said engine rotation, and a second component of which is representative of the discharging of said charge during a second prescribed portion of said engine rotation subsequent to said first prescribed portion, in response to said first and third signals; and sixth means, coupled to said fifth means and said second means, for generating a fuel injection valve opening signal in accordance with the duration of the second component of said fourth signal.

Claim 10

An electronic control apparatus for a fuel injection system according to claim 6, wherein said second signal generated by said third means has a first component of a first polarity representative of the density of oxygen in said engine exhaust gas exceedIng a prescribed level, and a second component of a second polarity, opposite to said first polarity, representative of the density of oxygen in said engine exhaust gas failing to exceed said predetermined level.

Claim 11

An electronic control apparatus for a fuel injection system according to claim 6, wherein the amplitude of the first component of said fourth signal at the termination of said first prescribed portion of said engine rotation is representative of the level of the density of oxygen in said exhaust gas, while the duration of said second component of said fourth signal is representative of the length of time required for the value of charge corresponding to said amplitude to discharge during said second prescribed portion of said engine rotation at a predetermined rate of discharge.

Claim 12

An electronic control apparatus for a fuel injection system according to claim 7, wherein the amplitude of the first component of said fourth signal at the termination of said prescribed portion of said engine rotation is representative of the level of the density of oxygen in said exhaust gas, while the duration of said second component of said fourth signal is representative of the length of time required for the value of charge corresponding to said amplitude to discharge during said second prescribed portion of said engine rotation at a predetermined rate of discharge.

Claim 13

An electronic control apparatus for a fuel injection system according to claim 6, further including a monostable multivibrator, coupled to the output of said second means, for controlling the operation of said fourth means.