Claims
- 1. 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 an intake passage, a fuel supply means for supplying fuel through a fuel passage into said intake passage to form, in said intake passage, an air-fuel mixture to be supplied to said engine, and a main valve positioned in said intake passage for controlling the amount of the air-fuel mixture;
- means connected with said fuel supply means for controlling the amount of the fuel to be supplied into said intake passage to compensate the air-to-fuel ratio of said air-fuel mixture;
- a pulse motor coupled to said fuel control means for driving the same in order to control the degree of the fuel supply;
- 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 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 change in the 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.
- 2. A system according to claim 1, wherein said fuel control means includes:
- an air bleed means opened to said fuel passage; and
- a control valve means coupled to said air bleed means and said pulse motor for controlling the amount of air to be supplied into said fuel passage, to thereby vary the amount of the fuel to be supplied into said fuel passage in accordance with the movement of said pulse motor.
- 3. A system according to claim 2, wherein said control valve means includes:
- a needle valve disposed in said air bleed means;
- an eccentric member coupled to said pulse motor; and
- a linkage member between said needle valve and said eccentric member.
- 4. A system according to claim 2, wherein said control valve means includes:
- a needle valve disposed in said air bleed means; and
- a cam means coupled to said pulse motor for depressing said needle valve.
- 5. A system according to claim 2, wherein said control valve means includes:
- a needle valve having a rack means; and
- a pinion means coupled to said pulse motor and engaged with said rack means.
- 6. A system according to claim 2, wherein said control valve means includes:
- a needle valve having a threaded portion; and
- a rod member coupled to said pulse motor and having a threaded portion to be engaged with that of said needle valve.
- 7. The system according to claim 1 wherein:
- said detecting means includes a drawn air quantity sensor for detecting the amount of the air drawn into said engine, and said control circuit being adapted to receive the output signal of said detecting means for operating said pulse motor at a speed corresponding to said detected change in said engine operating speed.
- 8. A system according to claim 7 wherein said control circuit includes a pulse oscillator for generating an output pulse frequency variable in accordance with the output signal of said drawn air quantity sensor, whereby said pulse motor is operated at a speed corresponding to the output pulse frequency of said pulse oscillator.
- 9. The air-to-fuel ratio controlling system according to claim 1 wherein said fuel passage includes:
- a main fuel passage communicating with a fuel nozzle in said fuel supply means, and wherein said fuel control means includes,
- an auxiliary fuel passage also communicating with said fuel nozzle, and
- a control valve coupled to said pulse motor and said auxiliary fuel passage in order to control the opening degree of said auxiliary fuel passage.
Priority Claims (5)
Number |
Date |
Country |
Kind |
48-63243 |
Jun 1973 |
JPX |
|
48-63244 |
Jun 1973 |
JPX |
|
48-63245 |
Jun 1973 |
JPX |
|
48-84346 |
Jul 1973 |
JPX |
|
48-109060 |
Sep 1973 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 475,917, U.S. Pat. No. 4,036,186, filed June 3, 1974.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
475917 |
Jun 1974 |
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