US 4,305,365 AGranted

Electronic controlled fuel injection system

AssigneeNissan Motor Co., Ltd.

InventorsHaruhiko Iizuka, Fukashi Sugasawa, Junichiro Matsumoto

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Abstract

An electronic controlled fuel injection system is disclosed for use in an internal combustion engine including a plurality of cylinders each fitted with a fuel injection valve. The system comprises a fuel injection control circuit timed to engine rotation for providing a drive pulse signal to the fuel injection valves. A deceleration detecting circuit detects deceleration of the engine in accordance with the positions of the associated throttle valve and foot brake. A coupling circuit is responsive to engine rotational speed for allowing or impeding the passage of the drive pulse signal to the fuel injection valves during deceleration.

Claims28

Dependent claims

An electronic controlled fuel injection system for use in automotive vehicle including a transmission, a foot brake, an internal combustion engine having a throttle valve, a plurality of fuel injection valves, said system comprising, in combination:

(a) a fuel injection control circuit timed to rotation of said engine for providing a drive pulse signal having a frequency corresponding the speed of rotation of said engine to said fuel injection valves so as to provide a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a fuel-cut signal generator responsive to the control signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined value and for terminating said fuel-cut signal when the engine speed is below a second predetermined valve lower than said first predetermined valve and comprising a frequency-to-voltage converter, first normally open switch means responsive to the signal from said deceleration signal generator for connecting the output of said fuel injection control circuit to the input of said frequency-to-voltage converter, a first signal generator generating on its output a signal indicative of a first reference engine rotational speed level, a second signal generator generating on its output a signal indicative of a second reference engine rotational speed level lower than said first reference level, a first comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said first signal generator for providing a high output when the former is higher than the latter, a second comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said second signal generator for providing a high output when the former is higher than the latter, a first inverter having its input connected to the output of said second comparator, a flip-flop having a set input connected to the output of said first comparator, a reset input connected to the output of said inverter, and an output, a second inverter having its input connected to said output of said flip-flop;
and
(f) a fuel-cut switch means responsive to said fuel-cut signal for disconnecting said fuel injection control circuit from said fuel injection valves and including a second normally open switch means having its one terminal connected to said fuel injection control circuit and the other terminal connected to the fuel injection valves, and said second switch means responsive to a high input from said inverter for allowing the passage of the drive pulse signal to said fuel injection valves.

4 more elements

An electronic controlled fuel injection system for use in an automotive vehicle including a transmission, a foot brake, an internal combustion engine having a throttle valve, a plurality of fuel injection valves, said system comprising, in combination:

(a) a fuel injection control circuit timed to the rotation of said engine for providing a drive pulse signal having a frequency corresponding to the speed of rotation of said engine to said fuel injection valves for providing a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a fuel-cut signal generator responsive to the signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined value but above a third predetermined value lower than said first predetermined engine speed value during the application of braking and for terminating said fuel-cut signal when the engine speed is below a second predetermined value lower than said third predetermined engine speed value;
and comprising a frequency-to-voltage converter, first normally open switch means responsive to the signal from said deceleration signal generator for connecting the output of said fuel injection control circuit to the input of said frequency-to-voltage converter, a first signal generator generating on its output a signal indicative of a first reference rotational speed level, a second signal generator generating on its output a signal indicative of a second reference engine rotational speed level lower than said first reference level, a third signal generator generating on its output a signal indicative of a third reference engine rotational speed level lower than said first reference level but higher than said second reference level, a first comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said first signal generator for providing a high output when the former is higher than the latter, a second comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said second signal generator for providing a high output when the former is higher than the latter, a third comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said third signal generator for providing a high output when the former is higher than the latter, a first AND gate having its one input connected to the output of said third comparator and the other input connected to said second sensor for passing the output of said third comparator when said foot brake is depressed, a second AND gate having its one input connected to the output of said first comparator and the other input connected to the output of a first inverter having its input connected to the output of said second sensor for passing the output of said first comparator when said foot brake is not depressed, and OR gate having inputs from the first and second AND gates, a second inverter having its input connected to the output of said second comparator, a flip-flop having a set input connected to the output of said OR gate, a reset input connected to the output of said second inverter, and an output, a third inverter having its input connected to said output of said flip-flop;
and a fuel-cut switch means responsive to said fuel-cut signal for disconnecting said fuel injection control circuit from said fuel injection valves and including a second normally open switch means having its one terminal connected to said fuel injection control circuit and the other terminal connected to the fuel injection valves, and said second switch means responsive to a high input from said inverter for allowing the passage of the drive pulse signal to said fuel injection valves.

4 more elements

An electronic controlled fuel injection system for use in an automotive vehicle including a transmission, a foot brake, an internal combustion engine having a throttle valve, and a plurality of fuel injection valves, said system comprising, in combination:

(a) a fuel injection control circuit timed to rotation of said engine for providing a drive pulse signal having a frequency corresponding to the speed of rotation of said engine to said fuel injection valves so as to provide a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a fuel-cut signal generator responsive to the deceleration signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined value and for terminating said fuel-cut signal when the engine speed is below a second predetermined value lower than said first predetermined value;
and
(f) switch means responsive to said fuel-cut signal for controlling application of said drive pulse signal of said fuel injection control circuit to said fuel injection valves.

4 more elements

(a) a fuel injection control circuit timed to rotation of said engine for providing a drive pulse signal having a frequency corresponding to the speed of rotation of said engine to said fuel injection valves so as to provide a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a fuel-cut signal generator responsive to the control signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined value as well as when the engine speed is above a third predetermined value lower than said first predetermined engine speed value during the application of braking and for terminating said fuel-cut signal when the engine speed is below a second predetermined value lower than said third predetermined engine speed value;
and
(f) switch means responsive to said fuel-cut signal for disconnecting said fuel injection control circuit from said fuel injection valves.

4 more elements

An electronic controlled fuel injection system for use in an automotive vehicle including a transmission, a foot brake, an internal combustion engine having a throttle valve, and a plurality of fuel injection valves, said system comprising, in combination:

(a) a fuel injection control circuit timed to the rotation of said engine for providing a drive pulse signal having a frequency corresponding to the speed of rotation of said engine to said fuel injection valves for providing a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed;
(d) a third sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(e) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and third sensors;
(f) a fuel cut signal generator responsive to the deceleration signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined engine speed value as well as above a third predetermined engine speed value lower than said first predetermined engine speed value during the application of braking and for terminating said fuel-cut signal when the engine speed is below a second predetermined engine speed value lower than said third predetermined engine speed value;
and comprising:
(i) converter means responsive to said fuel injection control circuit for providing a signal indicative of the speed of said engine;
(ii) a first engine speed reference circuit operative to generate a first reference signal indicative of said first predetermined engine speed value;
(iii) a first comparator circuit responsive to said first reference signal and said signal indicative of engine speed from said converter means for providing a signal when the engine speed is higher than said first predetermined engine speed value established by said first engine speed reference circuit;
(iv) A third engine speed reference circuit operative to generate a third reference signal indicative of said third predetermined engine speed value;
(v) a third comparator circuit responsive to said third reference signal and said signal indicative of engine speed from said converter means for providing a signal when the engine speed is higher than said third predetermined value established by said third engine speed reference circuit;
(vi) a first AND logic circuit having inputs from said third comparator circuit and said second sensor;
(vii) a second AND logic circuit having an input from said first comparator circuit and an additional input from said second sensor through an inverter;
(viii) an OR logic circuit responsive to at least one of the signals from said first and second AND logic circuits for providing a first signal;
(ix) a second engine speed reference circuit operative to generate a second reference signal indicative of said second predetermined engine speed value;
(x) a second comparator circuit responsive to said second engine speed reference signal and said signal indicative of engine speed from said converter means for providing a second signal when the engine speed is lower than said second predetermined value established by the second engine speed reference circuit;
(xi) and control means responsive to said first signal from said OR logic circuit for generating said fuel-cut signal and further responsive to said second signal from said second comparator circuit for terminating the generation of said fuel-cut signal;
and
(g) switch means responsive to said fuel-cut signal for controlling application of said drive pulse signal of said fuel injection control circuit to said fuel injection valves.

17 more elements

An electronic controlled fuel injection system for use in an automotive vehicle including a transmission, a foot brake, an internal combustion engine having a throttle valve, and a plurality of fuel injection valves split into first and second groups, said system comprising, in combination:

(a) a fuel injection control circuit timed to the rotation of said engine for providing a drive pulse signal having a frequency corresponding to the speed of rotation of said engine to said fuel injection valves for providing a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a first fuel-cut signal generator responsive to the signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined engine speed value as well as above a third predetermined engine speed value lower than said first predetermined engine speed value during the application of braking and for terminating said fuel-cut signal when the engine speed is below a second predetermined engine speed value lower than said third predetermined engine speed value;
(f) first switch means responsive to said fuel-cut signal for controlling application of said drive pulse signal of said fuel injection control circuit to said fuel injection valves;
(g) a second fuel-cut signal generator responsive to the control signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a fourth predetermined engine speed value and for terminating said fuel-cut signal when the engine speed is below a fifth predetermined engine speed value lower than said fourth predetermined engine speed value;
and
(h) second switch means responsive to said fuel-cut signal from said second-fuel signal generator for controlling application of said drive pulse signal of said fuel injection control circuit from said first switch means to said first group of fuel injection valves.

6 more elements

Dependencies are inferred from the claim text.

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Abstract

(a) a fuel injection control circuit timed to rotation of said engine for providing a drive pulse signal having a frequency corresponding the speed of rotation of said engine to said fuel injection valves so as to provide a predetermined inlet air/fuel ratio;
(b) a first sensor for providing a signal when said throttle valve is in its closed position;
(c) a second sensor for providing a signal when said foot brake is depressed except when said transmission is in its neutral position;
(d) a deceleration signal generator for generating a deceleration signal when at least one of the signals occurs from said first and second sensors;
(e) a fuel-cut signal generator responsive to the control signal from said deceleration signal generator for providing a fuel-cut signal when the engine speed is above a first predetermined value and for terminating said fuel-cut signal when the engine speed is below a second predetermined valve lower than said first predetermined valve and comprising a frequency-to-voltage converter, first normally open switch means responsive to the signal from said deceleration signal generator for connecting the output of said fuel injection control circuit to the input of said frequency-to-voltage converter, a first signal generator generating on its output a signal indicative of a first reference engine rotational speed level, a second signal generator generating on its output a signal indicative of a second reference engine rotational speed level lower than said first reference level, a first comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said first signal generator for providing a high output when the former is higher than the latter, a second comparator having its one input connected to the output of said frequency-to-voltage converter and the other input connected to the output of said second signal generator for providing a high output when the former is higher than the latter, a first inverter having its input connected to the output of said second comparator, a flip-flop having a set input connected to the output of said first comparator, a reset input connected to the output of said inverter, and an output, a second inverter having its input connected to said output of said flip-flop;
and
(f) a fuel-cut switch means responsive to said fuel-cut signal for disconnecting said fuel injection control circuit from said fuel injection valves and including a second normally open switch means having its one terminal connected to said fuel injection control circuit and the other terminal connected to the fuel injection valves, and said second switch means responsive to a high input from said inverter for allowing the passage of the drive pulse signal to said fuel injection valves.

4 more elements