Patent ID: 11885277
Assignee: NIKKI CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. A method for controlling fuel injection to an engine, the method comprising:
calculating an amount of air passing through a throttle, which is actually controlled, from a calculated amount of air in an intake manifold, which is calculated from a pressure value detected by a pressure sensor installed in the intake manifold connecting the throttle and a cylinder to each other, and a calculated pressure change in the intake manifold;
predicting an actual amount of air to be sucked into the cylinder when mixed with fuel from the calculated amount of air in the intake manifold and the calculated amount of air passing through the throttle; and
injecting an amount of fuel according to the predicted actual amount of air to be sucked into the cylinder;
wherein the amount of air passing through the throttle, which is actually controlled, is calculated from the calculated amount of air in the intake manifold and the calculated pressure change in the intake manifold using the formula:, Q
    t
   
   =
   
    
     (
     
      1
      +
      
       
        
         
          V
          m
         
         
          V
          c
         
        
        ·
        
         π
         
          K
          c
         
        
        ·
        
         1
         ω
        
        ·
        
         1
         
          P
          m
         
        
        ·
        
         d
         
          d
          t
         
        
       
       ⁢
       
        P
        m
       
      
     
     )
    
    ·
    
     Q
     a
    
   
  
  
   ;
   _, and
wherein Qt is the amount of air passing through the throttle, Vm is a volume in the intake manifold, Vc is a volume in the cylinder, Kc is a filling efficiency correction coefficient, ω is a revolutions per minute (rpm) of the engine, Pm is a pressure in the intake manifold, and Qa is the calculated amount of air in the intake manifold.