Air fuel injector and control
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTakeshi Ito, Yoshihiko Moriya
Life of this patent
Estimating the term…
Abstract
A fuel/air injector for a crankcase compression two-cycle internal combustion engine and control strategy therefore wherein under a first load range of the engine which is generally a low speed, low load range, fuel is supplied to the fuel/air injector at a time which does not precede the opening of the injector valve and then as the load and speed of the engine increase, the timing of opening of the injector valve is advanced until a certain condition is reached and thereafter the opening of the injector valve is held constant and the timing of fuel supply is advanced so that fuel supply precedes the opening of the injector valve.
Claims37
A fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions and control means for controlling fuel delivery by said fuel means to said chamber means and opening and closing of said injector valve in response to sensed engine conditions for varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
A method of operating a fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions, said method comprising the steps of varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
Dependencies are inferred from the claim text.