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US 4,036,186 AGranted
Air-fuel mixture ratio correcting system for carburetor
AssigneeNippon Soken, Inc.
InventorsTadashi Hattori, Shigetaka Takada, Kenji Hayashi, Toshiharu Iwata
Life of this patent
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Abstract
There is provided an air-fuel mixture ratio correcting system for a carburetor in which the air-fuel ratio of a mixture fed to an engine is detected whereby to control the amount of auxiliary fuel and/or the amount of auxiliary air to always control the air-fuel ratio of the mixtures at the correct value.
Claims14
An air-to-fuel ratio controlling system for an internal combustion engine comprising:
- a carburetor connected to an intake manifold of an internal combustion engine and including a main passage and a bypass passage for supplying an air-fuel mixture to said engine;
- a main valve positioned in said main passage for controlling the amount of the air-fuel mixture, a bypass valve positioned in said bypass passage for compensating the air-to-fuel ratio of said air-fuel mixture by controlling the amount of air flow therethrough;
- a pulse motor coupled to said bypass valve for driving said valve in order to control the degree of opening of said bypass valve;
- a pulse generator for generating a train of pulses having a frequency which varies in proportion to the rotational speed of said engine;
- a frequency divider connected to said pulse generator for converting the train of pulses from said pulse generator into plural trains of pulses having different and lower frequencies;
- detecting means coupled to an intake manifold of said internal combustion engine for detecting a rapid change of the operational speed of said internal combustion engine;
- selecting means connected to said detecting means for selecting one of said plural trains of pulses from said frequency divider in accordance with the detected operational speed of said engine;
- air-to-fuel ratio sensing means disposed in an exhaust manifold of said internal combustion engine for detecting the air-to-fuel ratio of the air-fuel mixture supplied to said engine;
- and
- a control circuit connected to said selecting means, said air-to-fuel ratio sensing means and said pulse motor for driving said pulse motor at a speed determined by the selected train of pulses from said selecting means, the rotational direction of said pulse motor depending on the output from said air-to-fuel ratio sensing means.
7 more elements
An air-to-fuel ratio controlling system for an internal combustion engine comprising:
- a carburetor connected to an intake manifold of an internal combustion engine and including a main passage and a bypass passage for supplying an air-fuel mixture to said engine, a main valve positioned in said main passage for controlling the amount of the air-fuel mixture, a bypass means in said bypass passage for compensating the air-to-fuel ratio of said air-fuel mixture by controlling the amount of air flow therethrough;
- a pulse motor coupled to said bypass means for driving said bypass means in order to control the degree of opening of said bypass means;
- a pulse generator for generating a train of pulses having a frequency which varies in response to at least one operational condition of said engine;
- air-to-fuel ratio sensing means disposed in an exhaust manifold of said internal combustion engine for detecting the air-to-fuel ratio of the air-fuel mixture supplied to said engine;
- and
- a control circuit connected to said pulse generator, said air-to-fuel ratio sensing means and said pulse motor for driving said pulse motor at a speed determined by the frequency of the train of pulses from said pulse generator, the rotational direction of said pulse motor depending on the output from said air-to-fuel ratio sensing means, the amount of the air-flow flowing through said bypass passage being decreased when the air-to-fuel ratio of the air-fuel mixture detected by said air-to-fuel ratio sensing means is higher than a predetermined value, and being increased when the air-to-fuel ratio is lower than said predetermined value to thereby compensate the air-to-fuel ratio of the air-fuel mixture supplied to said engine, wherein the compensation is rapidly carried out.
3 more elements
An air-to-fuel ratio controlling system for an internal combustion engine comprising:
- a carburetor connected to an intake manifold of an internal combustion engine and including a main passage for supplying an air-fuel mixture to said engine and a main valve in said main passage for controlling the amount of the air-fuel mixture;
- a bypass passage connected to said intake manifold and including a bypass control means for compensating the air-to-fuel ratio of said air-fuel mixture;
- a pulse motor coupled to said bypass control means for driving said bypass control means in order to control the opening degree of said bypass control means;
- air-to-fuel ratio sensing means disposed in an exhaust manifold of said internal combustion engine for detecting the air-to-fuel ratio of the air-fuel mixture supplied to said engine;
- a pulse generator for generating a train of pulses having a frequency responsive to at least one operation condition of said engine;
- and
- a control circuit connected to said pulse generator, said air-to-fuel ratio sensing means and said pulse motor for driving said pulse motor at a speed determined by the frequency of the train of pulses from said pulse generator, the rotational direction of said pulse motor depending on the output from said air-to-fuel ratio sensing means, whereby the amount of the air-flow through said bypass passage is decreased when the air-to-fuel ratio of the air-fuel mixture detected by said air-to-fuel sensing means is higher than a predetermined value, and being increased when the air-to-fuel ratio is lower than said predetermined value to thereby compensate the air-to-fuel ratio of the air-fuel mixture to be supplied to said engine wherein the compensation is rapidly carried out.
4 more elements
An air-fuel ratio controlling system for an internal combustion engine comprising:
- a carburetor connected to an intake manifold of an internal combustion engine and including a main passage for supplying an air-fuel mixture to said engine and a main valve in said main passage for controlling the amount of the air-fuel mixture;
- a bypass passage connected to said intake manifold and including a bypass control means for compensating the air-fuel ratio of said air-fuel mixture;
- driving means coupled to said bypass control means for driving said bypass control means in order to control the opening degree of said bypass control means;
- air-fuel ratio sensing means disposed in an exhaust manifold of said engine for detecting the air-fuel ratio of the air-fuel mixture supplied to said engine;
- a pulse generator for generating a train of pulses having a frequency responsive to at least one operation condition of said engine;
- and
- a control circuit connected to said pulse generator, said air-fuel ratio sensing means and said driving means for driving said driving means at a speed determined by the frequency of the train of pulses from said pulse generator, the rotational direction of said driving means depending on the output from said air-fuel ratio sensing means, whereby the amount of the air-flow through said bypass passage is decreased when the air-fuel ratio of the air-fuel mixture detected by said air-fuel ratio sensing means is higher than a predetermined value, and being increased when the air-fuel ratio is lower than said predetermined value to thereby compensate the air-fuel ratio of the air-fuel mixture to be supplied to said engine wherein the compensation is rapidly carried out.
4 more elements
Dependencies are inferred from the claim text.