Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1983-03-22
1984-11-13
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123494, 123492, F02B 300
Patent
active
044819277
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an apparatus for supplying fuel into an internal combustion engine for an automobile. More particularly, it is concerned with an apparatus for supplying fuel into an internal combustion engine, which comprises a vortex flow meter for detecting the quantity of air drawn into the engine, a first electromagnetic valve adapted to be driven for a predetermined length of time synchronously with the frequency output of the vortex flow meter to inject fuel, and a second electromagnetic valve adapted to be driven responsive to the rotatory speed of the engine to inject fuel in a quantity corrected to suit the operating condition of the engine.
BACKGROUND ART
A vortex flow meter provides a frequency output corresponding to the vortical speed (number of vortexes formed) which is proportional to the quantity of air to be measured. A method for injecting a predetermined quantity of fuel into an engine synchronously with the frequency output which is proportional to the quantity of air drawn thereinto has been proposed in Unexamined Utility Model Publication No. 133919/ 1978 or Unexamined patent publication No. 5448/1980. This method has the disadvantage that a lower frequency of fuel injection is likely to bring about changes in rotation during the idling operation of the engine during which only a smaller quantity of air is drawn thereinto, particularly when the engine is of the multicylinder type. On the other hand, a prior method which injects fuel in accordance with the rotatory speed of the engine stabilizes the idling operation, since it enables the uniform supply of fuel to all the cylinders even during the idling operation during which only a smaller quantity of air is drawn into the engine. The method of injecting fuel in accordance with the frequency output proportional to the quantity of air drawn into the engine, however, improves the acceleration performance of the engine, since it enables the injection of fuel without any appreciable delay when the quantity of air has been changed. On the other hand, the method of injecting fuel in accordance with the rotatory speed of the engine lowers its acceleration performance, since an increase in its rotatory speed takes place with a certain amount of delay after the quantity of air drawn thereinto has been changed.
DISCLOSURE OF THE INVENTION
This invention provides an apparatus for supplying fuel into an internal combustion engine which includes a first electromagnetic valve for injecting fuel synchronously with the frequency output which is proportional to the quantity of air drawn into the engine, and a second electromagnetic valve for injecting fuel synchronously with the rotatory speed of the engine, and which eliminates the drawbacks of the known systems as hereinabove pointed out.
More specifically, this invention provides an apparatus which enables stabilization of the idling operation of a multicylinder engine and an improvement in its acceleration performance, since it comprises a vortex flow meter (4) generating a frequency output corresponding to a vortical speed proportional to the quantity of air drawn into the engine whereby the quantity of air drawn into the engine is detected, a first electromagnetic valve (5) driven for a predetermined length of time synchronously with the frequency output of the vortex flow meter (4) to inject fuel, an operating unit (8') for calculating the input corresponding to the frequency output of the vortex flow meter (4) and the temperature of the air drawn into the engine, and determining the quantity of fuel injection corresponding to the rotatory speed of the engine, and a second electromagnetic valve (6) for injecting synchronously with the rotatory speed of the engine the quantity of fuel determined by the operating unit (8'). If the second electromagnetic valve (6) is so designed as to supply a quantity of fuel corrected to suit the air temperature, engine temperature, atmospheric pressure, air-fuel ratio feedback control, etc., the time required for the calculation
REFERENCES:
patent: 4121549 (1978-10-01), Martin
patent: 4140088 (1979-02-01), Vulpillieres
patent: 4256075 (1981-03-01), Fukui
patent: 4269157 (1981-05-01), Fujishiro
patent: 4409929 (1983-10-01), Sasaki
patent: 4424785 (1984-01-01), Ishida
Asayama Yoshiaki
Miki Takao
Cox Ronald B.
Mitsubishi Denki & Kabushiki Kaisha
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