US3867913A — Fuel feed devices for internal combustion engines

Claim 1

Independent Claim 277 words

A fuel feed device for internal combustion engines comprising, in an intake pipe of the engine, a main throttle member actuated by the driver, a source of fuel under pressure, a delivery circuit in fluid communication with said fuel source and which opens into the portion of the intake pipe situated downstream of the main throttle member, at least one valve positioned to control said delivery circuit, an electromagnet in operative relationship for actuating said valve, and a metering system which comprises a rotary member rotated continuously and independently from any necessary synchronization with said engine and an auxiliary throttle member and arranged to be opened or closed automatically and progressively to a degree which is a function of the flow rate of air in said pipe as it increases or decreases respectively, said metering system being adapted to send into the electromagnet at least one energizing signal during a fraction of each turn of the rotary member, said fraction varying in proportion only as the degree of opening of auxiliary throttle member, which is governed by said flow rate of air, the metering system comprising means operatively associated with said rotary member for generating a first electrical signal on each turn of the rotary member, means sensitive to the degree of opening of the auxiliary throttle member for generating a second electrical signal representative of the degree of opening of said auxiliary throttle member, and signal forming means receiving said second signal and responsive to each said first signal for generating one of said energizing signals during a fraction of the corresponding turn of the rotary member which is a function of said second signal only.

Claim 2

Dependent Claim 277 words

A fuel feed device for internal combustion engines comprising, in an intake pipe of the engine, a main throttle member actuated by the driver, a source of fuel under pressure, a delivery circuit in fluid communication with said fuel source and which opens into the portion of the intake pipe situated downstream of the main throttle member, at least one valve positioned to control said delivery circuit, an electromagnet in operative relationship for actuating said valve, and a metering system which comprises a rotary member rotated continuously and independently from any necessary synchronization with said engine and an auxiliary throttle member and arranged to be opened or closed automatically and progressively to a degree which is a function of the flow rate of air in said pipe as it increases or decreases respectively, said metering system being adapted to send into the electromagnet at least one energizing signal during a fraction of each turn of the rotary member, said fraction varying in proportion only as the degree of opening of auxiliary throttle member, which is governed by said flow rate of air, the metering system comprising means operatively associated with said rotary member for generating a first electrical signal on each turn of the rotary member, means sensitive to the degree of opening of the auxiliary throttle member for generating a second electrical signal representative of the degree of opening of said auxiliary throttle member, and signal forming means receiving said second signal and responsive to each said first signal for generating one of said energizing signals during a fraction of the corresponding turn of the rotary member which is a function of said second signal only.

Claim 3

Dependent Claim 102 words

Device according to claim 1, wherein the generator of electrical signals comprises a capacitor, a variable resistance sensitive to the position of the said auxiliary throttle member and switch means adapted to control successively, and at each turn of the rotary member, the charge of said capacitor during rotation of a predetermined angle (a) of this rotary member and the discharge of said capacitor into the circuit constituted by the variable resistance and by a threshold device connected in series, the threshold device sending into the electromagnet an energising signal as long as the discharge current is higher than a given threshold.

Claim 4

Dependent Claim 118 words

Device according to claim 2, wherein the switch means have two stable states, a first state corresponding to the charging of the capacitor and a second state corresponding to the discharging of the capacitor, said means being controlled by a signal furnished by a field sensor in the neighbourhood of which is rotated a magnetic mass rigidly fixed to said rotary member, a rotation of a predetermined angle (a) of the magnetic mass generating in the sensor, on each turn of said rotary member, a release signal of which the start actuates the placing in the first state of said switch means and of which the end actuates the placing in the second state of said switch means.

Claim 5

Dependent Claim 54 words

Device according to claim 2, wherein the variable resistance is constituted by a rheostat provided with a movable slider whose displacements are actuated by the movements of a cam which is rigidly fixed to the auxiliary throttle member and which comprises an active surface bearing on a mechanical connecting member movable with said slider.

Claim 6

Dependent Claim 244 words

A fuel feed device for an internal combustion engine having an intake pipe and a driver actuated main throttle member in said pipe, said device including: at least one valve for delivering fuel under pressure to a portion of the intake pipe of the engine downstream of said main throttle member, said valve being of a type substantially insentitive to the pressure prevailing in said intake pipe, electro-magnetic means for opening said valve upon energization thereof, an auxiliary throttle member located in said intake pipe upstream of the main throttle member and arranged to be opened automatically and progressively in proportion with increase of the flow rate of air in said intake pipe, fuel pressure regulator means responsive to the pressure in said intake pipe for delivering fuel to said valve under a pressure which is substantially proportional to the air pressure in said intake pipe between said auxiliary throttle member and main throttle member, and a fuel metering system for delivering to said electromagnetic means electrical actuating pulses for opening said valve, said metering system comprising means for generating a sequence of first electrical signals independently from any necessary synchronization with said engine and electrical circuit means controlled by said auxiliary throttle member for generating, responsive to each said first electrical signal, an energizing signal during a time which is a fraction of the time period between two successive said first signals which depends on the position of said auxiliary throttle member only.

Claim 7

Dependent Claim 244 words

A fuel feed device for an internal combustion engine having an intake pipe and a driver actuated main throttle member in said pipe, said device including: at least one valve for delivering fuel under pressure to a portion of the intake pipe of the engine downstream of said main throttle member, said valve being of a type substantially insentitive to the pressure prevailing in said intake pipe, electro-magnetic means for opening said valve upon energization thereof, an auxiliary throttle member located in said intake pipe upstream of the main throttle member and arranged to be opened automatically and progressively in proportion with increase of the flow rate of air in said intake pipe, fuel pressure regulator means responsive to the pressure in said intake pipe for delivering fuel to said valve under a pressure which is substantially proportional to the air pressure in said intake pipe between said auxiliary throttle member and main throttle member, and a fuel metering system for delivering to said electromagnetic means electrical actuating pulses for opening said valve, said metering system comprising means for generating a sequence of first electrical signals independently from any necessary synchronization with said engine and electrical circuit means controlled by said auxiliary throttle member for generating, responsive to each said first electrical signal, an energizing signal during a time which is a fraction of the time period between two successive said first signals which depends on the position of said auxiliary throttle member only.

Claim 8

Dependent Claim 49 words

A fuel feed device according to claim 5, wherein said means for generating a first electrical signal comprises a rotary member rotated continuously and independently from any necessary synchronization with said engine, and means for generating one of said first electrical signals on each turn of the rotary member.

Claim 9

Dependent Claim 98 words

A fuel feed device according to claim 6, wherein said electrical circuit means comprises signal forming means connected to receive said first signal and including an electrical component whose value is controlled by said auxiliary throttle member, whereby an energizing signal is delivered responsive to each said first electrical signal and during a time which is a fraction of the duration of the corresponding turn of the rotary member which is a function of said degree of opening only, and said fraction remains constant so long as the flow rate of air in the intake pipe remains constant.

Claim 10

Dependent Claim 67 words

Device according to claim 5, wherein said signal forming means comprises a computing device adapted to provide said energizing signal from said first signal which begins when said member is in a predetermined angular position and ends when said rotary member has effected a rotation of a predetermined angle and a second signal which represents the measurement of the degree of opening of the auxiliary throttle member.

Claim 11

Dependent Claim 209 words

Feed device according to claim 8, wherein said first signal is constituted, on each turn of the rotary member, by a release pulse of which the beginning is concomitant with the passage of said rotary member through a fixed and predetermined angular position and said second signal is constituted by a continuous voltage whose value depends on the degree of opening of the auxiliary throttle member, and wherein said computing device comprises a modulation member adapted to furnish, when it is placed in action by the beginning of a release pulse, an output voltage for a time comprising a constant period and a period proportional to the value of an input voltage furnished to said modulation member, the output of said modulation member being connected to its input through a loop in which are arranged successively, in series, an integrator adapted to integrate the output voltage during an interval of time comprised between the commencements of two successive release pulses, a comparator adapted to effect the difference between the output signal of the integrator and said seconD signal and a high gain amplifier adapted to transmit said difference amplified to the input of the modulating member, the energising signal being constituted by the output voltage of said modulating member.

Claim 12

Dependent Claim 186 words

Feed device according to claim 8, in which said first signal is constituted, on each turn of said rotary member, by a release pulse whose duration is proportional to the duration during which said rotary member effects a rotation of a predetermined and constant angle and said second signal is constituted by a continuous voltage whose value depends on the degree of opening of the auxiliary throttling member, wherein the computing device comprises an oscillator adapted to deliver pulses with a frequency dependent on the value of said second signal and reading in and reading out means adapted, on each release pulse, on one hand, to count the number of pulses delivered by said oscillator during the duration of the release pulse and, on the other hand, to read out with a given and constant rythm the number of pulses delivered by said oscillator during the duration of the preceding release pulse, said reading in and reading out means providing, on each reading out a signal whose duration is proportional to the magnitude of the number of pulses read out and which constitutes the energising signal.

Claim 13

Dependent Claim 118 words

Feed device according to claim 9, wherein the signal forming means comprises a flip flop with two actuating inputs and two outputs, the first actuating input being fed by the first signal, the second actuating input being fed by the output voltage of the modulating member, the first output being connected to an input for bringing into action the modulating member and the second output being adapted to furnish the energising signal, said energising signal being present on the second output when the flip flop is placed in a state whose start is actuated by the beginning of the rlease pulse and whose end is actuated by the end of the output voltage furnished by the modulating member.

Claim 14

Dependent Claim 111 words

Feed device according to claim 10, wherein the reading in and reading out means comprise a summation means provided with a first memory adapted to read in the number of pulses delivered by the oscillator during the duration of a release pulse and a second memory adapted to record said number and to provide, under the action of a generator of fixed frequency read-out pulses, a signal constituted by a succession of said same number of read-out pulses, the succession of read-out pulses being applied to a decoding member adapted to supply an output voltage constituting the energising signal for a duration equal to that of said succession of read-out pulses.

Claim 15

Dependent Claim 213 words

Feed device according to claim 12, wherein the readin and read-out means comprise a first electronic switch which is interposed between the first memory and the oscillator and which is actuated by the first signal so that the pulses delivered by the oscillator are only transmitted to the first memory during the duration of the release pulse, a second electronic switch which is interposed between the read-out pulse generator and the second memory and which is actuated by the first signal so that the pulses delivered by the readout pulse generator are transmitted to the second memory from the beginning of the release pulse of the first signal and a flip flop with two actuating inputs and two outputs, the first actuating input being supplied by the first signal, the second actuating input being fed by the output voltage of the decoding member, the first output being connected to the actuating input of the second electronic switch and a second output being adapted to supply the energising signal, said energising signal being present on the second output when the flip flop is placed in a state whose beginning is actuated by the beginning of the release pulse and whose end is actuated by the end of the output voltage of the decoding member.

Claim 16

Dependent Claim 95 words

Feed device according to claim 8, wherein the energising signal is transmitted to the elecTromagnet through an electronic switch which is actuated by comparison means adapted to compare the duration of each energising signal to a corresponding fixed reference duration, so that said switch is closed and ensures the transmission of energising signals to the electromagnet when the duration of said energising signals is greater than said reference duration and said switch is open and does not transmit energising signals to the electromagnet when the duration of said signals is less than the reference duration.

Claim 17

Dependent Claim 28 words

Fuel feed device according to claim 14, wherein said fixed reference duration is the duration of the energising signal when the internal combustion engine operates at slow speed.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-02-24	1978-08-26	1979-02-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-02-24	1982-08-26	1983-02-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-02-24	1986-08-26	1987-02-25	$7700.00	Window Closed / Lapsed

Fuel feed devices for internal combustion engines

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