Fuel injection system for internal combustion engine

Claim 2

A fuel injection system for an internal combustion engine, comprising a single fuel injecting means for supplying the fuel to a plurality of cylinders of said engine, and control means for controlling said single fuel injection means in such a manner that the fuel injected from said single fuel injecting means is injected by responding to every two suction strokes of said plurality of cylinders, said control means including means for defining the timing of commencement of the injection of fuel in such a manner so as to establish a uniform distribution of fuel supplied to the cylinders among the respective cylinders.

Claim 3

A fuel injection system for an internal combustion engine according to claim 1, further including means for detecting operating conditions of said plurality of cylinders, wherein said fuel injecting means is adapted to initiate the fuel injection in response to a signal which is produced by said control means in response to the signal output from said detecting means and represents a determined fuel injection initiating timing.

Claim 4

A fuel injection system for an internal combustion engine according to claim 2, wherein said fuel injecting means is adapted to inject fuel in response to a signal which is produced from said control means in response to the signal output from said detecting means and represents a determined fuel injecting time duration.

Claim 5

A fuel injection system for an internal combustion engine according to claim 3, wherein said control means includes an injecting time setting circuit for setting previously the fuel injecting time duration of said fuel injecting means, a second signal output circuit for producing a signal in response to the signal output from said detecting means, and a second comparator circuit for comparing the set value preset in said injecting timing setting means with the signal value output from said second signal output means, the signal commanding said fuel injecting time duration being produced as an output signal from said second comparator circuit.

Claim 6

A fuel injection system for an internal combustion engine according to claim 2, wherein said detecting means includes suction air flow metering means for metering a quantity of air supplied to said plural cylinders and position detecting means for detecting positions of the pistons within said cylinders at the respective suction strokes, said control means being adapted to produce a signal representative of a preset fuel injecting initiating timing to said fuel injecting means in response to the signals output from said suction air flow metering means and said position detecting means.

Claim 7

A fuel injection system for an internal combustion engine according to claim 5, wherein said suction air flow metering means in disposed at one side of a suction air flow metering cylinder which is communicated to said plural cylinders at the other side thereof, and said fuel injecting means is singularly disposed at said other side of said suction air flow metering cylinder.

Claim 8

A fuel injection system for an internal combustion engine according to claim 5 or 6, wherein said suction air flow metering means is located in a bypass passage formed at an upstream portion of said suction air flow cylinder communicated to said plural cylinders through an intake conduit, said fuel injecting means in disposed singularly at a downstream portion of said suction air flow metering cylinder so that fuel is injected into said plural cylinders through said intake conduit.

Claim 9

A fuel injection system for an internal combustion engine according to claim 7, wherein said suction air flow metering means includes a hot-wire sensor, while said fuel injecting means includes a single fuel injector.

Claim 10

A fuel injection system for an internal combustion engine according to claim 7, wherein said control means includes an injecting time setting circuit for setting previously the fuel injecting time duration of said fuel injecting means, a second signal output circuit for producing a signal in response to the signal output from said detecting means, and a second comparator circuit for comparing the set value preset in said injecting timing setting means with the signal value output from said second signal output means, the signal commanding said fuel injecting time duration being produced as an output signal from said second comparator circuit.

Claim 11

A fuel injection system for an internal combustion engine according to claim 5, wherein said position detecting means includes crank angle detecting means for detecting angular position of the engine crank at the suction strokes of said plural cylinders.

Claim 12

A fuel injection system for an internal combustion engine according to claim 2, wherein said control means comprises operational processing means for producing the preset fuel injection initiating timing signal in response to the signal output from said detecting means, and signal input/output means for transferring the signal output from said detecting means to said operational processing means and transferring the signal output from said operational processing means to said fuel injecting means.

Claim 13

A fuel injection system for an internal combustion engine according to claim 2, wherein said control means comprises an injection initiating timing setting circuit for setting previously the fuel injection initiating timing of said fuel injection means, a first signal output circuit for producing a signal in response to the signal output from said detecting means, and a first comparator circuit for comparing the preset value set in said injecting timing setting means with the signal value output from said first signal output means, said signal commanding said fuel injection initiating timing being produced as an output signal from said first comparator circuit.

Claim 14

A fuel injection system for an internal combustion engine according to claim 1, wherein said fuel injecting means is singularly disposed with interposition of an intake conduit at one side of an array of said plurality of cylinders arrayed in a row in a predetermined order, said control means being adapted to regulate the fuel injection initiating timing in dependence on distance between said fuel injecting means and the cylinder into which the fuel is to be injected.

Claim 15

A fuel injection system for an internal combustion engine according to claim 1, wherein said fuel injecting means is singularly disposed with interposition of an intake conduit at one side of an array of said plurality of cylinders arrayed in a row in a predetermined order, said control means being adapted to regulate fuel supply time duration in dependence on distance between said fuel injecting means and the cylinder into which the fuel is to be injected.

Claim 16

A fuel injection system for an internal combustion engine according to claim 1, wherein said detecting means includes temperature detecting means for detecting temperature of a coolant for cooling said plural cylinders, said control means being adapted to respond to the signal output from said temperature detecting means thereby to regulate said fuel injecting time duration.

Claim 17

A fuel injection system for an internal combustion engine according to claim 2, wherein said control means is adapted to respond to the signal output from said detecting means thereby to control said fuel injecting means so that the cylinders to which fuel is to be injected can be changed over to one another.

Claim 18

A fuel injection system for an internal combustion engine according to claim 2 or 16, wherein said detecting means includes exhaust gas detecting means for detecting exhaust gas discharged from said plural cylinders, said control means being adapted to respond to the signal output from said exhaust gas detecting means thereby to control said fuel injecting means so that the cylinders to which fuel is to be injected can be changed over to one another.

Claim 19

A fuel injection system for an internal combustion engine according to claim 16, wherein said exhaust gas detecting means includes an O 2 -sensor.

Claim 20

A fuel injection system for an internal combustion engine according to claim 1, wherein said control means is adapted to control said fuel injecting means so that fuel is injected from said fuel injecting means once for two suction strokes of said plural cylinders.

Claim 21

A fuel injection system for an internal combustion engine according to claim 1 or 19, wherein said plurality of cylinders comprises four cylinders in which the suction strokes are repeated in the order of a first, a third, a fourth and a second cylinder, said control means being adapted to control said fuel injecting means such that fuel injection to said first and fourth cylinders takes place when said first and fourth cylinders are at the suction stroke.

Claim 22

A fuel injection system for an internal combustion engine according to claim 20, wherein said control means being adapted to change said first and fourth cylinders to which fuel is to be injected over to said third and second cylinders in dependence on operating conditions of said engine.

Claim 25

A fuel injection system for an internal combustion engine, comprising a single fuel injecting means for supplying fuel to a plurality of cylinders, and control means adapted to control said single fuel injecting means so that fuel is injected from said single fuel injecting means individually to the said cylinders for every suction stroke of said plurality of cylinders and at the same time to regulate for every cylinder a fuel injecting time duration during which fuel is injected to said individual cylinder in dependence on operating conditions of said engine, said control means including cylinder discriminating means for identifying the cylinder whose fuel injecting time duration is to be regulated, and injection time ratio setting means for responding to a signal output from said cylinder discriminating means thereby to preset the ratio of fuel injecting time durations between the cylinders whose fuel injecting time duration is to be regulated and the other cylinders in dependence on operating conditions of the engine, and further comprising suction air quantity detecting means for detecting the quantity of air supplied to said plural cylinders, and crank angle detecting means for detecting the position of pistons within said cylinders at each of said suction strokes in terms of crank angle, wherein said cylinder discriminating means is adapted to respond to a single output from said crank angle detecting means, while said fuel injecting time ratio setting means is adapted to respond to a single output from said suction air quantity detecting means.

Claim 26

A fuel injection system for an internal combustion engine, comprising a single fuel injecting means for supplying fuel to a plurality of cylinders, and control means adapted to control said single fuel injecting means so that fuel is injected from said single fuel injecting means individually to the said cylinders for every suction stroke of said plurality of cylinders and at the same time to regulate for every cylinder a fuel injecting time duration during which fuel is injected to said individual cylinder in dependence on operating conditions of said engine, said control means including cylinder discriminating means for identifying the cylinder whose fuel injecting time duration is to be regulated, and injection time ratio setting means for responding to a signal output from said cylinder discriminating means thereby to preset the ratio of fuel injecting time durations between the cylinders whose fuel injecting time duration is to be regulated and the other cylinders in dependence on operating conditions of the engine, and further comprising suction air quantity detecting means for detecting the quantity of air supplied to said plural cylinders, and crank angle detecting means for detecting the position of pistons within said cylinders at each of said suction strokes in terms of crank angle, wherein said cylinder discriminating means is adapted to respond to a single output from said crank angle detecting means, while said fuel injecting time ratio setting means is adapted to respond to a single output from said suction air quantity detecting means.

Claim 27

A fuel injection systemn for an internal combustion engine according to clain 23, wherein said cylinder discriminating means is adapted to respond to a signal output fromm said crank angle detecting means thereby to prepare first and second output signal which are supplied to first and second control circuits, respectively, while said fuel injecting time ratio setting means is adapted to respond to a signal output from said suction air quantity detecting means thereby to prepare third and fourth output signals which are applied to said first and second control circuits, respectively, said first and second control circuits being adapted to respond to said first, second, third and fourth output signals thereby to prepare first and second fuel injecting time duration signals having the ratio preset in said injecting time ratio setting means.

Claim 28

A fuel injection systemn for an internal combustion engine according to clain 23, wherein said cylinder discriminating means is adapted to respond to a signal output fromm said crank angle detecting means thereby to prepare first and second output signal which are supplied to first and second control circuits, respectively, while said fuel injecting time ratio setting means is adapted to respond to a signal output from said suction air quantity detecting means thereby to prepare third and fourth output signals which are applied to said first and second control circuits, respectively, said first and second control circuits being adapted to respond to said first, second, third and fourth output signals thereby to prepare first and second fuel injecting time duration signals having the ratio preset in said injecting time ratio setting means.

Claim 29

A fuel injection system for an internal combustion engine according to claim 24, further comprising a flip-flop circuit for responding to the signal output from said crank angle detecting means thereby to producing first and second signals, first and second transistor circuits including first and second transistors having base electrodes supplied with said first and second signals output from said flip-flop circuit, respectively, a variable resistor for responding to the signal output from said suction air quantity detecting means thereby to divide said signal into the third and fourth signals at a predetermined ratio, and first and second gate circuit for controlling said first and second transistor circuits so that said third and fourth output signals are applied to the collector electrodes of said first and second transistors.