Air-fuel metering system for internal combustion engine and apparatus to control air fuel ratio of air-fuel being applied to engine

Claim 2

An air-fuel metering system for an internal combustion engine, comprising: an induction passage with a venturi section; a fuel reservoir; a pump providing a source of fuel flow and pressure; a fluidic element having a supply port in communication with the fuel from the pump, a vent port in communication with the fuel reservoir and an outlet port, the fluidic element further having a first control port exposed to the atmospheric pressure and a second control port; a vacuum conduit connecting the second control port with the venturi section of the induction passage, the vacuum conduit having a fixed flow restrictor therein; air-fuel mixture circuit means connecting the outlet port of the fluidic element with the induction passage; the fluidic element being so constructed and arranged as to increase fuel flow from the supply port to the outlet port in response to an increase in the vacuum applied to the second control port; a second conduit having one end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the second control port of the fluidic element and other end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the venturi section; means for generating an output signal indicative of the character of the exhaust gases; means for generating a feedback signal responsive to the output signal from the output signal generating means; and solenoid valve means for restricting fluid flow through the second conduit responsive to the feedback signal.

Claim 3

An air-fuel metering system for an internal combustion engine, comprising: an induction passage with a venturi section; a fuel reservoir; a pump providing a source of fuel flow and pressure; a fluidic element having a supply port in communication with the fuel from the pump, a vent port in communication with the fuel reservoir and an outlet port, the fluidic element further having a first control port exposed to the atmospheric pressure and a second control port; a vaccum conduit connecting the second control port with the venturi section of the induction passage, the vacuum conduit having a fixed flow restrictor therein; air-fuel mixture circuit means connecting the outlet port of the fluidic element with the induction passage; the fluidic element being so constructed and arranged as to increaseful flow from the supply port to the outlet port in response to an increase in the vacuum applied to the second control port; a second conduit having one end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the second control port of the fluidic element and other end opening to the ambient atmosphere; means for generating an output signal indicative of the character of the exhaust gases; means for generating a feedback signal responsive to the output signal from the output signal generating means; and solenoid valve means for restricting fluid flow through the second conduit responsive to the feedback signal.

Claim 4

An air-fuel metering system for an internal combustion engine, comprising: an induction passage with a venturi section; a fuel reservoir; a pump providing a source of fuel flow and pressure; a fluidic element having a supply port in communication with the fuel from the pump, a vent port in communication with the fuel reservoir and an outlet port, the fluidic element further having a first control port exposed to the atmospheric pressure and a second control port; a vaccum conduit connecting the second control port with the venturi section of the induction passage, the vacuum conduit having a fixed flow restrictor therein; air-fuel mixture circuit means connecting the outlet port of the fluidic element with the induction passage; the fluidic element being so constructed and arranged as to increaseful flow from the supply port to the outlet port in response to an increase in the vacuum applied to the second control port; a second conduit having one end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the second control port of the fluidic element and other end opening to the ambient atmosphere; means for generating an output signal indicative of the character of the exhaust gases; means for generating a feedback signal responsive to the output signal from the output signal generating means; and solenoid valve means for restricting fluid flow through the second conduit responsive to the feedback signal.

Claim 5

An air-fuel metering system for an internal combustion engine, comprising: an induction passage with a venturi section; a fuel reservoir; a pump providing a source of fuel flow and pressure; a fluidic element having a supply port in communication with the fuel from the pump, a vent port in communication with the fuel reservoir and an outlet port, the fluidic element further having a first control port exposed to the atmospheric pressure and a second control port; a vacuum conduit connecting the second control port with the venturi section of the induction passage, the vacuum conduit having a fixed flow restrictor therein; air-fuel mixture circuit means connecting the outlet port of the fluidic element with the induction passage; the fluidic element being so constructed and arranged as to increase fuel flow from the supply port to the outlet port in response to an increase in the vacuum applied to the second control port; a second conduit having one end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the second control port of the fluidic element and other and connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the venturi section; means for generating an output signal indicative of the character of the exhaust gases; means for generating a feedback signal responsive to the output signal from the output signal generating means, the feedback signal being in the form of a series of rectangular pulses; and solenoid valve means for restricting fluid flow through the second conduit responsive to the feedback signal.

Claim 6

An air-fuel metering system for an internal combustion engine, comprising: an induction passage with a venturi section; a fuel reservoir; a pump providing a source of fuel flow and pressure; a fluidic element having a supply port in communication with the fuel from the pump, a vent port in communication with the fuel reservoir and an outlet port, the fluidic element further having a first control port exposed to the atmospheric pressure and a second control port; a vacuum conduit connecting the second control port with the venturi section of the induction passage, the vacuum conduit having a fixed flow restrictor therein; air-fuel mixture circuit means connecting the outlet port of the fluidic element with the induction passage; the fluidic element being so constructed and arranged as to increase fuel flow from the supply port to the outlet port in response to an increase in the vacuum applied to the second control port; a second conduit having one end connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the second control port of the fluidic element and other and connected to the vacuum conduit at a location thereof intermediate the fixed flow restrictor and the venturi section; means for generating an output signal indicative of the character of the exhaust gases; means for generating a feedback signal responsive to the output signal from the output signal generating means, the feedback signal being in the form of a series of rectangular pulses; and solenoid valve means for restricting fluid flow through the second conduit responsive to the feedback signal.