Arrangement for controlling an air-fuel ratio of an air-fuel mixture of an internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorTakatoshi Masui
Life of this patent
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Abstract
An arrangement for controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine is disclosed. In the arrangement a fluidic element or fluidic elements, performing high frequency on-off control action, are arranged in feedback control circuits for regulating the amount of flow of air or fuel to be supplied into an engine carburetor, thereby adjusting the air-fuel ratio to the level of the stoichiometric air-fuel ratio.
Claims6
An arrangement for controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine from a carburetor via an intake manifold, comprising:
- a first means for producing a signal indicative of a change in the air-fuel ratio of the air-fuel mixture;
- a second means for producing an on-off control signal of high frequency from the signal from the first means;
- and
- two fluidic elements performing regulation of the amount of flow of one of an air bleed and fuel, which are supplied to the carburetor of the engine, at a high frequency corresponding to the frequency of the on-off control signal of said second means, thereby adjusting the air-fuel ratio of the air-fuel mixture to the stoichiometric air-fuel ratio, one of said fluidic elements being arranged in a main fuel supply system of the engine and the other of said fluidic elements being arranged in a low-speed fuel supply system of the engine.
An arrangement for controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine from a carburetor via an intake manifold, comprising:
- a lambda sensor arranged in an exhaust pipe of the engine for producing an electric signal indicative of the actual air-fuel ratio of the air-fuel mixture to be supplied to the engine;
- a computer unit for producing an electric on-off control signal of high frequency from the electric signal of the lambda sensor, the electric on-off control signal being indicative of a deviation of the actual air-fuel ratio from the stoichiometric air fuel ratio;
- an electro-magnetic flapper device electrically connected to said computer unit, said device having a flapper which is electro-magnetically operated in response to the electric on-off control signal from said computer unit, and a control port connected to an air pump by means of an air pipe, the flapper operating to open and close the control port;
- and,
- first and second fluidic elements for regulating the amount of air bleed supplied to a main fuel supply system and a low-speed fuel supply system of the engine, respectively, each of said fluidic elements having an air inlet port connected to the air pump, a control-air input port connected to the air pump via an orifice, and first and second air output ports connected to the fuel passage respectively, the first air outlet port of each of said first and second fluidic elements having an orifice therein.
An arrangement for controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine from a carburetor via an intake manifold, comprising:
- a lambda sensor arranged in an exhaust pipe of the engine for producing an electric signal indicative of the actual air-fuel ratio of the air-fuel mixture to be supplied to the engine;
- a computer unit for producing an electric on-off control signal of high frequency from the electric signal of the lambda sensor, the electric on-off control signal being indicative of a deviation of the actual air-fuel ratio from the stoichiometric air-fuel ratio;
- first and second fluidic elements for regulating the amount of fuel to be additionally supplied into a main fuel supply system and low-speed fuel supply system of the engine, respectively, each of said fluidic elements having a fuel inlet port fluidly connected to a fuel float chamber of the engine, a first fuel outlet port for passing the fuel from the fuel inlet port to the related fuel supply system, and a second fuel outlet port for passing the fuel from the fuel inlet port to said fuel float chamber via a fuel return pipe;
- and,
- means for electro-magnetically actuating said regulation of said first and second fluidic elements upon receipt of said electric on-off control signal of high frequency.
Dependencies are inferred from the claim text.