Fuel injecting systems for internal combustion engines

Claim 2

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers each of them having a saturable magnetic core of a rectangular hysteresis loop, an input-winding; a bias-winding; a speed-winding; and an output-winding; switching elements connected so as to be turned on by the output of said pulse tranformers, the number of said switching elements being equal to that of the engine-cylinders; an inductor; a negative pressure-resistor adapted to have a resistance variable in accordance with the negative pressure in the intake pipe; a successively operating switching having pairs of electrodes of a number equal to that of the engine-cylinders and adapted to close or open according to the rotation of the engine, said inductor, said negative pressure-resistor and said successively operating switch all being connected in series to said input-winding; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a D.C. voltage variable with the r.p.m. of the engine; a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine, said speed-winding being connected to said d.c. source through said throttle-resistor; and fuel injection valves or nozzles of a number equal to that of the engine-cylinder, the energizing circuit for the injection valves being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching elements and the circuit including said switching elements being opened as the result of the deenergization of said fuel injection valves.

Claim 3

A fuel injecting System for an internal combustion engine as claimed in claim 1 in which said switching elements include an SCR.

Claim 4

A fuel injecting system as claimed in claim 1 which includes a first group of relays of a number equal to that of the engine-cylinders and second group of relays of the same number and a second successively operating switch having pairs of electrodes of a number equal to that of the engine-cylinders and adapted to close or break according to the rotation of the engine, the energizing circuit of said fuel injection valves including a corresponding pair of electrodes for said second successively operating switch; the class-B contact (closed when deenergized) corresponding to one of the first group of relays and the coil corresponding to one of the second group of the relays, and the circuit of said switching elements including a coil corresponding to one of said first group of relays; and the class-A contact (closed when energized) corresponding to one of said second group of relays.

Claim 5

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers, each having a saturable magnetic core of a rectangular hysteresis loop; an input-winding; a bias-winding; a speed-winding; and an output-winding, the number of said pulse transformers being equal to that of the engine-cylinders; a switching element connected so as to be turned-on by the output across the series connection of said output-windings; an inductor; a negative pressure-resistor adapted to have a resistance variable in accordance with the negative pressure in the intake pipe of the engine; a successively operating switch having pairs of electrodes of a number equal to that of the engine-cyinders and adapted to close or open according to the rotation of the engine, said inductor, said negative pressure-resistor and successively operating switch all being connected in series to said input-winding; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine; a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine, said speed-winding being connected to said d.c. source through said throttle-resistor; and fuel injection valves or nozzles of a number equal to that of the engine-cylinders, the energizing circuit for the injection valves being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching element, and the circuits including said switching elements being opened as the result of the deenergization of said fuel injection valves.

Claim 6

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers, each having a saturable magnetic core of a rectangular hysteresis loop; an input-winding; a bias-winding; a speed-winding; and an output-winding, the number of said pulse transformers being equal to that of the engine-cylinders; a switching element connected so as to be turned-on by the output across the series connection of said output-windings; an inductor; a negative pressure-resistor adapted to have a resistance variable in accordance with the negative pressure in the intake pipe of the engine; a successively operating switch having pairs of electrodes of a number equal to that of the engine-cyinders and adapted to close or open according to the rotation of the engine, said inductor, said negative pressure-resistor and successively operating switch all being connected in series to said input-winding; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine; a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine, said speed-winding being connected to said d.c. source through said throttle-resistor; and fuel injection valves or nozzles of a number equal to that of the engine-cylinders, the energizing circuit for the injection valves being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching element, and the circuits including said switching elements being opened as the result of the deenergization of said fuel injection valves.

Claim 7

A fuel injecting system as claims in claim 4 which includes a first common relay, a second common relay, a second successively operating switch having pairs of electrodes of a number equal to that of the engine-cylinders and adapted to close or break according to the rotation of the engine, the energizing circuit of said fuel injection valve including the class-B contact (closed when deenergized) of said first common relay and the coil of said second common relay; and the circuit of said switching element including the coil of said first common relay and the class-A contact (closed when energized) of said second relay.

Claim 8

A fuel injecting system as claimed in claim 1 which includes: a temperature-resistor adapted to have a resistance variable in accordance with the acceleration of the engine; and an atmospheric pressure-resistor adapted to have a resistance variable in accordance with the atmospheric pressure, said temperature-resistor, said acceleration-resistor and said atmospheric pressure-resistor being connected to the circuit of said input-winding.

Claim 9

A fuel injecting sysTem as claimed in claim 1 in which said resistor has a constant resistance and said inductor is adapted to have a value variable in accordance with the negative pressure in the intake pipe, the temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure.

Claim 10

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers, each having a saturable magnetic core of a rectangular hysteresis loop, an input-winding, a bias-winding, a speed-winding and an output-winding; switching elements connected so as to be turned-on by the output of said output-winding, the number of said pulse transformers and switching elements being equal to the number of engine-cylinders; an a.c. generator having armature windings of a number equal to that of the engine-cyinders and adapted to generate output voltages with phase differences corresponding to the timing of the fuel injections, said a.c. generator being acttuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure, the temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; the armature windings of said a.c. generator being connected to the corresponding input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine, a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine; said speed-winding being connected to said d.c. source through said throttle-resistor; fuel injection valves or nozzles of a number equal to that of the engine-cylinders; the energizing circut for the injection valve being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching elements; and the circuits including said switching elements being opened as the result of the deenergization of said fuel injection valves.

Claim 11

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers, each having a saturable magnetic core of a rectangular hysteresis loop, an input-winding, a bias-winding, a speed-winding and an output-winding; switching elements connected so as to be turned-on by the output of said output-winding, the number of said pulse transformers and switching elements being equal to the number of engine-cylinders; an a.c. generator having armature windings of a number equal to that of the engine-cyinders and adapted to generate output voltages with phase differences corresponding to the timing of the fuel injections, said a.c. generator being acttuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure, the temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; the armature windings of said a.c. generator being connected to the corresponding input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine, a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine; said speed-winding being connected to said d.c. source through said throttle-resistor; fuel injection valves or nozzles of a number equal to that of the engine-cylinders; the energizing circut for the injection valve being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching elements; and the circuits including said switching elements being opened as the result of the deenergization of said fuel injection valves.

Claim 12

A fuel injecting system as claimed in claim 8 which includes a first group of relays of a number equal to that of the engine-cylinders, a second group of relays of the same number; a second successively operating switch having pairs of electrodes of a number equal to that of the engine-cylinders and adapted to close or break according to the rotation of the engine, the energizing circuit of said fuel injection valve including a corresponding electrode of said second switch, a class-B contact corresponding with the first group of relays and a coil corresponding to the second group of relays; and the circuit of said switching element including a coil corresponding to said first group of relays and a class-A contact (closed when energized) corresponding to said second group of relays.

Claim 13

A fuel injection system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers each having a saturable magnetic core of a rectangular hysteresis loop; an inputwinding; a bias-winding; a speed-winding; and an output-winding; the number of said pulse transformers being equal to that of the engine-cylinders; a switching element connected so as to be turned-on by the output of the series connection of said output-winding; an a.c. generator having armature windings of a number equal to that of the engine-cylinders and adapted to generate output voltage with phase differences corresponding to the differences among the timings of the fuel injections, said a.c. generator being actuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure, the temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; the armature winding of said a.c. generator being connected to the corresponding input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine; a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine, said speed-winding being connected to said d.c. source through said throttle-resistor; and fuel injection valves of nozzles of a number equal to that of the engine-cylinders, the energizing circuit for the injection valves being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching element; and the circuits including said switching element being opened as the result of the deenergization of said fuel injection valves.

Claim 14

A fuel injection system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers each having a saturable magnetic core of a rectangular hysteresis loop; an inputwinding; a bias-winding; a speed-winding; and an output-winding; the number of said pulse transformers being equal to that of the engine-cylinders; a switching element connected so as to be turned-on by the output of the series connection of said output-winding; an a.c. generator having armature windings of a number equal to that of the engine-cylinders and adapted to generate output voltage with phase differences corresponding to the differences among the timings of the fuel injections, said a.c. generator being actuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure, the temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; the armature winding of said a.c. generator being connected to the corresponding input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine; a throttle-resistor adapted to have a resistance variable in accordance with the opening angle of the throttle valve of the engine, said speed-winding being connected to said d.c. source through said throttle-resistor; and fuel injection valves of nozzles of a number equal to that of the engine-cylinders, the energizing circuit for the injection valves being closed by said successively operating switch in accordance with the rotation of the engine and being opened by the current flowing in said switching element; and the circuits including said switching element being opened as the result of the deenergization of said fuel injection valves.

Claim 15

A fuel injecting system as claimed in claim 10, which includes a first common relay, a second common relay, a second successively operating switch having pairs of electrodes of a number equal to that of the engine-cylinders and adapted to close or break according to the rotation of the engine, the energizing circuit or said fuel injection valve including a corresponding electrode of said second successively operating switch, the energizing circuits of said fuel injection valves including the class-B (closed when deenergized) contact of said first common relay and the coil of said second common relay; and the circuit of said switching element including the coil of said first common relay and the class-A contact (closed when energized) of said second common relay.

Claim 16

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers each of them having a saturable magnetic core of a rectangular hysteresis loop; an input-winding; a bias-winding; and an output-winding; switching elements connected so as to be turned-on by the output of said output-winding, the numbers of said pulse transformers and said switching elements being equal to the number of the engine-cylinders, an a.c. generator having armature windings of a number equal to that of the engine-cylinders and adapted to generate output voltages with phase differences corresponding to the differences among the timings of the fuel injections; said a.c. generator being actuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure,t he temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; a throttle resistor adapted to provide a variable resistance in accordance with the opening angle of the throttle valve; the armature winding of said a.c. generator being connected to the corresponding one of said input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine, said throttle-resistor being connected to the regulating circuit of said d.c. source, the field winding of said a.c. generator being connected to said d.c. source; and fuel injection valves or nozzles of a number equal to that of the engine-cylinders, the energizing circuits of said fuel injection valves being closed as the result of the turn-on of said switching element and opened correspondingly.

Claim 17

A fuel injecting system for an internal combustion engine, a throttle-resistor adapted to have a variable resistance in accordance with the opening angle of a throttle valve; used together with an engine having cylinders, an intake pipe and a throttle valve, comprising: pulse transformers each of them having a saturable magnetic core of a rectangular hysteresis loop; an input-winding; a bias-winding; and an output-winding; switching elements connected so as to be turned-on by the output of said output-winding, the numbers of said pulse transformers and said switching elements being equal to the number of the engine-cylinders, an a.c. generator having armature windings of a number equal to that of the engine-cylinders and adapted to generate output voltages with phase differences corresponding to the differences among the timings of the fuel injections; said a.c. generator being actuated from the engine; a variable resistor adapted to have a resistance variable in accordance with at least one of: the negative pressure,t he temperature in the intake pipe, the acceleration of the engine and the atmospheric pressure; a throttle resistor adapted to provide a variable resistance in accordance with the opening angle of the throttle valve; the armature winding of said a.c. generator being connected to the corresponding one of said input-windings through said variable resistor; said bias winding being connected so as to be energized with direct current; a d.c. source adapted to generate a d.c. voltage variable with the r.p.m. of the engine, said throttle-resistor being connected to the regulating circuit of said d.c. source, the field winding of said a.c. generator being connected to said d.c. source; and fuel injection valves or nozzles of a number equal to that of the engine-cylinders, the energizing circuits of said fuel injection valves being closed as the result of the turn-on of said switching element and opened correspondingly.

Claim 18

A fuel injecting system as claimed in claim 12, which includes a successively operating switch having pairs of electrodes of A number equal to that of the engine-cylinders and adapted to close or break according to the rotation of the engine, the energizing circuit of said fuel injection valve including the corresponding electrode of said successively operating switch.

Claim 19

A fuel injecting system as described in claim 12 in which a single switching element is used commonly for all the engine-cylinders.