Control of fuel injection type induction system
AssigneeYamaha Hatsukoki Kabushiki Kaisha
InventorsEtsuhiro Tezuka, Koichiro Kaji, Toru Ichinose
Life of this patent
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Abstract
Controls for induction systems of fuel injection supplied internal combustion engines in which the induction system flows from an air amount detection means to combustion cylinders, through a main or principal intake passage and a sub-intake or shunt passage. Fuel injection means discharges fuel into the main intake passage in amounts determined by the detection means. The sub-intake passage directs air in a jet stream into the combustion chamber to cause turbulence therein. The sub-intake passage discharges into the combustion cylinders at a substantially different angle from the main intake passage and intersects the discharge from the fuel injection means to improve the fuel air mixture entering the combustion cylinders.
Claims64
In combination with an internal combustion engine of the type which includes a chamber of variable volume in which combustion occurs and a main induction passage receiving air to form a charge for the chamber and to deliver said charge to said chamber through a main intake port, an air amount detection means to measure the air flow into said main induction passage, fuel supply means supplying fuel to said chamber in amounts determined by said air amount detection means, main throttle valve means for controlling the flow through at least a portion of said main induction passage, the improvement comprising an auxiliary induction passage extending from a point in said main induction passage between said air amount detection means and said main throttle valve means and discharging into said chamber through an auxiliary intake port communicating with said main induction passage contiguous to said main intake port for delivering a turbulent charge to said chamber, said auxiliary intake port being juxtaposed to said chamber for delivering the charge to the chamber at substantially undiminished velocity, said auxiliary induction passage being sized to provide substantially all of the air flow requirements of said chamber at least at the idle condition of the engine, the fuel supplied by said fuel supply means being proportional to the total air supplied regardless of the ratio of charge supplied to said chamber by said passages.
An internal combustion engine having a variable volume chamber in which combustion occurs and a main intake passage communicating with said chamber through a main intake port for delivering a charge thereto, the improvement comprising a sub-intake passage communicating with said chamber through a sub-intake port, said sub-intake port being in communication with said main intake passage contiguous to said main intake port for delivery of the charge to said chamber from said sub-intake port in substantially undiminished velocity and direction, said sub-intake passage having an effective cross-sectional area substantially less than the effective cross-sectional area of said main intake passage for causing a given mass flow of charge through said sub-intake port to enter the chamber at a substantially greater velocity, the direction of the charge entering said chamber from said main intake port differing substantially from the direction of the charge entering said chamber from said sub-intake port, throttle valve means comprising throttle valve means positioned in said sub-intake passage and throttle means in said main intake passage for controlling the ratio of communication of said ports with said chamber during a given cycle of operation of said engine and actuating means for opening said throttle valves, said actuating means being operative to effect initial opening of the throttle valve in said sub-intake passage prior to opening of the throttle valve in said main intake passage so that the flow pattern inducted by said sub-intake passage predominates the flow pattern in said chamber before the throttle valve in said main intake passage is opened.
In an internal combustion engine having a variable volume chamber in which combustion occurs and a main intake passage communicating with said chamber through a main intake port for delivering a charge thereto, the improvement comprising a sub-intake passage communicating with said chamber through a sub-intake port, said sub-intake port being in communication with said main intake passage contiguous with said main intake port for delivery of the charge to said chamber from said sub-intake port in substantially undiminished velocity and direction, said sub-intake passage having an effective cross-sectional area substantially less than the effective cross-sectional area of said main intake passage for causing a given mass flow of charge through said sub-intake port to enter the chamber at a substantially greater velocity, said sub-intake port being sufficiently large so as to provide sufficient flow to satisfy substantially all of the engine idle charge requirements, the direction of the charge entering said chamber from said main intake port differing substantially from the direction of the charge entering said chamber from said sub-intake port, and throttle valve means for controlling the ratio of communication of said ports with said chamber during a given cycle of operation of said engine and for directing substantially all of the idle charge requirements to said chamber through said sub-intake port and so that the flow pattern generated by said sub-intake port predominates the flow pattern in said chamber during idle operation.
In an internal combustion engine having a variable volume chamber in which combustion occurs, a main intake passage communicating through a main intake port with said chamber for delivering a charge to said chamber and a fuel injection nozzle discharging in to said main induction passage contiguous to said main intake port, the improvement comprising a sub-intake passage terminating at a sub-intake port communicating with said main intake passage contiguous to the path of fuel discharge from said fuel injection nozzle, and means for causing a high velocity of air flow from said sub-intake passage across the path of fuel discharge upon an induction cycle.
In an induction system for a multiple chamber engine having a plurality of substantially open variable volume chambers in which combustion occurs, a plurality of main induction passages, each communicating with a respective open variable volume chamber through a respective main intake port, and a plurality of auxiliary induction passages, each communicating with a respective of said variable volume chambers, through respective auxiliary intake ports, said auxiliary intake ports being in communication with said main induction passages contiguous to the respective main intake port for delivery of the charge therefrom to the respective chamber at substantially unrestricted velocity and unchanged direction, said auxiliary induction passages having a substantially lesser effective cross-sectional area than said main induction passages so that a given mass flow through said auxiliary induction passages enters the respective chambers at a substantially greater velocity than the same mass flow through said main induction passages, the improvement comprising means providing substantially unrestricted communication of said auxiliary induction passages with each other at least during the low speed running of the engine.
An internal combustion engine having a substantially open variable volume chamber in which combustion occurs, a main intake passage communicating with said chamber for delivering a charge thereto, an auxiliary intake passage communicating with said chamber, said auxiliary intake passage having an effective cross-sectional area substantially less than the effective cross-sectional area of said main intake passage for causing a given mass flow of charge through said auxiliary intake passage to enter the chamber at a substantially greater velocity, said auxiliary intake passage having an outlet disposed relative to said chamber so that the charge enters the open portion of said chamber from said auxiliary intake passage outlet at substantially undiminished velocity and in a substantially different direction than the flow from said main intake passage, said auxiliary intake passage having its inlet communicating directly with said main intake passage and its outlet communicating with said main intake passage contiguous to its point of discharge into said chamber, and throttle valve means for controlling the ratio of communication of said ports with said chamber during a given cycle of operation of said engine, said throttle valve means comprising a throttle valve in said main intake passage between said chamber and said auxiliary intake passage inlet.
In an induction system for a multiple cylinder engine having a plurality of variable volume chambers in which combustion occurs, a plurality of main induction passages, each communicating with a respective variable volume chamber, a plurality of auxiliary induction passages, each communicating with a respective of said variable volume chambers, said auxiliary induction passages having a substantially lesser effective cross-sectional area than the main induction passages so that a given mass flow through said auxiliary induction passages enters the respective chambers at a substantially greater velocity than the same mass flow through said main induction passages, said auxiliary induction passages each communicating respective of said main induction passage contiguous to a point of communication with the respective chamber for discharge of the charge therefrom into said chambers at substantially undiminished velocity, main throttle valve means for controlling the flow through said main induction passages to the respective chambers, and auxiliary throttle valve means controlling the flow through said auxiliary induction passages to the respective chambers, the improvement comprising said auxiliary induction passages each communicating with said primary induction passages downstream from said main throttle valve means and passage means providing substantially unrestricted communication of said auxiliary induction passages with each other for maintaining the pressure in said main induction passage downstream of said main throttle valve means at a pressure less than atmospheric.
Dependencies are inferred from the claim text.