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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNoriyuki Kurihara, Yoshikatsu Iida, Hiromatsu Matsumoto
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Several embodiments of engines and systems for fueling engines to reduce the emission of unwanted exhaust gas constituents and to improve the fuel economy of the engine. A catalytic converter is provided in the exhaust system and a gaseous fuel is used at least during starting so as to bring the catalytic converter up to its operating temperature rapidly without necessitating the provision of an enriched fuel/air mixture. An oxygen sensor is employed in the exhaust system and a feedback control system varies the fuel/air ratio of the engine during its running in response to the output of the oxygen sensor. In order to test that the oxygen sensor is at its operating condition before feedback control is initiated, a rich fuel mixture is supplied and this rich fuel mixture is discontinued immediately upon the receipt of a signal from the oxygen sensor indicating that a rich mixture exits. Applications of the principal to both air valve type of carburetors and conventional carburetors are disclosed.
A charge forming and induction system for an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, a throttle valve in said induction passage, means for automatically controlling the position of said throttle valve to maintain a substantially constant pressure in the induction passage in the area of the throttle valve during the running of said engine, a main fuel discharge circuit discharging into said induction passage contiguous to said throttle valve and including a fuel control valve for controlling the amount of fuel supplied from said main fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, an idle discharge circuit for supplying fuel to said engine downstream of said main fuel discharge circuit, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said fuel discharge circuits, and means for controlling the fuel/air mixture supplied to at least one of the fuel discharge circuits by selectively adding air to the fuel supplied thereto upstream of said fuel control valve.
A charge forming and induction system for an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, a throttle valve in said induction passage, means for automatically controlling the position of said throttle valve to maintain a substantially constant pressure in the induction passage in the area of the throttle valve during the running of said engine, a main fuel discharge circuit discharging into said induction passage contiguous to said throttle valve and including a fuel control valve for controlling the amount of fuel supplied from said main fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, an idle discharge circuit for supplying fuel to said engine downstream of said main fuel discharge circuit, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said fuel discharge circuits, and means for supplying fuel from said source to the engine independently of said charge forming device for enrichment purposes.
A charge forming and induction system for an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, an automatic throttle valve in said induction passage, means for automatically controlling the position of said automatic throttle valve to maintain a substantially constant pressure in the induction passage in the area of the automatic throttle valve during the running of said engine, a fuel discharge circuit discharging into said induction passage and including a fuel control valve for controlling the amount of fuel supplied from said fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, a manually operated throttle valve downstream of said fuel discharge circuit for controlling the speed of the engine, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said fuel discharge circuit and means for controlling the fuel/air mixture supplied to said fuel discharge circuit by adding air to the fuel supplied to said fuel discharge circuit.
A control system for an internal combustion engine for controlling the emission of undesirable exhaust gases, said engine having a combustion chamber and an induction system for drawing atmospheric air and delivering a charge to said combustion chamber, a charge former having a main fuel discharge circuit and another fuel discharge circuit for delivering fuel to said induction system, a fuel control valve for controlling the flow of fuel from said source through at least one of said circuits, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said charge former, means for selectively adding atmospheric air with the fuel supplied from said source to said charge former upstream of said fuel control valve for varying the air/fuel ratio discharged by said charge former, air/fuel ratio sensor means for sensing the air/fuel ratio of said engine, and means for adjusting the amount of atmospheric air added with the fuel supplied to maintain the desired fuel/air ratio during engine operation.
A control system for an internal combustion engine for controlling the emission of undesirable exhaust gases, said engine having a combustion chamber and an induction system for drawing atmospheric air and delivering a charge to said combustion chamber, a charge former for delivering fuel to said induction system, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said charge former including means for effecting vaporization of the fuel and regulation of the pressure of the fuel supplied to the fuel discharge circuit at a below atmospheric pressure, means for selectively adding atmospheric air with the fuel supplied from said source to said charge former for varying the air/fuel ratio discharged by said charge former, air/fuel ratio sensor means for sensing the air/fuel ratio of said engine, and means for adjusting the amount of atmospheric air added with the fuel supplied to maintain the desired fuel/air ratio during engine operation, the pressure of the fuel supplied for enrichment purposes being at a higher pressure than the fuel pressure supplied to the charge former.
An emission control system for an internal combustion engine having a combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the atmosphere, an oxygen sensor in said exhaust system for sensing a rich fuel/air condition in the exhaust gases of said engine, an induction system including charge forming means for supplying a fuel/air mixture into said combustion chamber for combustion therein, means for controlling said charge former from the signal of said oxygen sensor for maintaining a desired fuel/air ratio for exhaust emission control, means for providing a rich fuel/air mixture to said combustion chamber during initial engine operation for testing when said oxygen sensor is operative to supply a signal indicative of a rich fuel condition, and means for thereafter controlling the supply of fuel/air mixture by said oxygen sensor by selectively adding air with the fuel supplied upstream of the discharge point a fuel discharge circuit of said charge former means.
A method of operating an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, a throttle valve in said induction passage, means for automatically controlling the position of said throttle valve to maintain a substantially constant pressure in the induction passage in the area of the throttle valve during the running of said engine, a main fuel discharge circuit discharging into said induction passage and including a fuel control valve for controlling the amount of fuel supplied from said main fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, an idle discharge circuit for supplying fuel to the engine downstream of said main fuel discharge circuit and a source of gaseous fuel under pressure as a liquid, said method comprising the steps of supplying fuel from said source to said fuel discharge circuits and controlling the fuel/air mixture supplied to the fuel discharge circuit by selectively adding air with the fuel supplied thereto upstream of the fuel control valve.
A method of operating an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, a throttle valve in said induction passage, means for automatically controlling the position of said throttle valve to maintain a substantially constant pressure in the induction passage in the area of the throttle valve during the running of said engine, a main fuel discharge circuit discharging into said induction passage and including a fuel control valve for controlling the amount of fuel supplied from said main fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, an idle discharge circuit for supplying fuel to the engine downstream of said main fuel discharge circuit and a source of gaseous fuel under pressure as a liquid, said method comprising the steps of supplying fuel from said source to said fuel discharge circuits and supplying fuel from the source to the engine independently of the charge forming device for enrichment purposes.
A method of operating an internal combustion engine having a combustion chamber, an induction system for supplying a charge to said combustion chamber, said induction system comprising a charge forming device having an induction passage communicating at one end with atmospheric air and at another end with said combustion chamber, an automatic throttle valve in said induction passage, means for automatically controlling the position of said automatic throttle valve to maintain a substantially constant pressure in said induction passage at said automatic throttle valve during the running of said engine, a fuel discharge circuit discharging into said induction passage and including a fuel control valve for controlling the amount of fuel supplied from said fuel discharge circuit, means for controlling the condition of said fuel control valve in response to the position of said throttle valve, a source of gaseous fuel under pressure as a liquid, a manually operated throttle valve downstream of said fuel discharge circuit for controlling the speed of the engine, said method comprising the step of supplying fuel from said source to said fuel discharge circuit and controlling the air/fuel ratio by selectively adding air to the fuel supplied to said fuel discharge circuit.
A control system for an internal combustion engine for controlling the emission of undesirable exhaust gases, said engine having a combustion chamber and an induction system for drawing atmospheric air and delivering a charge to said combustion chamber, a charge former having a main fuel discharge circuit and another discharge circuit for delivering fuel to said induction system, a fuel control valve for controlling the flow of fuel from said fuel source through at least one of said circuits, a source of gaseous fuel under pressure as a liquid, means for supplying fuel from said source to said charge former, means for selectively adding atmospheric air with the fuel supplied from said source to said charge former upstream of said fuel control valve for varying the air/fuel ratio discharged by said charge former, said system comprising sensing the air/fuel ratio of said engine, and adjusting the amount of atmospheric air added with the fuel supply to provide the desired fuel/air ratio during engine operation.
An emission control system for an internal combustion engine having a combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the atmosphere, an oxygen sensor in said exhaust system for sensing a rich fuel condition in the exhaust gases of said engine, an induction system including charge forming means for supplying a fuel/air mixture into said combustion chamber for combustion therein, means for controlling said charge former from the signal of said oxygen sensor for maintaining a desired fuel/air ratio for exhaust emission control, said system comprising providing a rich fuel/air mixture to said combustion chamber during initial engine operation for testing when said oxygen sensor is operative to supply a signal indicative of a rich fuel condition, and thereafter controlling the supply of fuel/air mixture by said oxygen sensor by mixing air with the fuel supplied upstream of a fuel discharge circuit of the charge former means.
Dependencies are inferred from the claim text.