Patent ID: 11867124
Assignee: IHI CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A fuel supply control device configured to generate an operation amount used for feedback-controlling rotation of a gear pump based on a deviation of a detected flow rate of a fuel with respect to a target flow rate,
wherein the fuel supply control device generates the operation amount such that a rotation speed of the gear pump is equal to or greater than a lower limit rotation speed Nmin so as to protect a bearing of the gear pump,
wherein the fuel supply control device comprises:
a lower limit value calculator configured to calculate the lower limit rotation speed Nmin using a viscosity coefficient of a lubricant of the bearing calculated based on a fuel temperature of the gear pump, a pressure-boosted amount of the gear pump, a shaft diameter and a minimum gap of the bearing, and a Sommerfeld number,
an operation amount calculator configured to calculate an operating rotation speed N based on the deviation; and
a comparator configured to output larger one of the lower limit rotation speed Nmin and the operating rotation speed N as the operation amount of an actual rotation speed, and
wherein the lower limit rotation speed Nmin is given by the following Equation (1) constituted by a viscosity coefficient μ of the lubricant of the bearing calculated based on the fuel temperature of the gear pump, the pressure-boosted amount P of the gear pump, a shaft diameter r, the minimum gap of the bearing cmin, and the Sommerfeld number S:, N
      ⁢
      min
     
     =
     
      
       P
       μ
      
      ⁢
      
       
        S
        [
        
         
          c
          ⁢
          min
         
         r
        
        ]
       
       2
      
     
    
   
   
    
     (
     1
     )