Patent ID: 11953867
Assignee: GRUNDFOS HOLDING A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G  H | IPC G  H

Claim 2:
3. A multi-pump control system according to claim 1, wherein the approximated pump characteristics Pn and Δ{tilde over (p)}n are defined by the formulas, P
      n
    
    =
    
      
        
          n
          ⁡
          
            (
            
              
                
                  θ
                  1
                
                ⁢
                
                  ω
                  n
                  3
                
              
              +
              
                
                  Q
                  ~
                
                ⁢
                
                  
                
                ⁢
                
                  ω
                  n
                  2
                
                ⁢
                
                  1
                  n
                
              
              +
              
                
                  θ
                  2
                
                ⁢
                
                  
                    Q
                    ~
                  
                  2
                
                ⁢
                
                  ω
                  n
                
                ⁢
                
                  1
                  
                    𝔫
                    2
                  
                
              
            
            )
          
        
        ⁢
        
          
        
        ⁢
        and
        ⁢
        
          
        
        ⁢
        Δ
        ⁢
        
          
        
        ⁢
        
          
            p
            ~
          
          n
        
      
      =
      
        
          
            θ
            3
          
          ⁢
          
            ω
            n
            2
          
        
        +
        
          
            θ
            4
          
          ⁢
          
            Q
            ~
          
          ⁢
          
            
          
          ⁢
          
            ω
            n
          
          ⁢
          
            1
            n
          
        
        +
        
          
            
              Q
              ~
            
            2
          
          ⁢
          
            1
            
              n
              2
            
          
        
      
    
  
  ,

wherein {tilde over (Q)}=bPQ denotes a scaled approximated flow with
bP being a scaling factor, wherein θ1, θ2 denote a first pair of the parameters and θ3, θ4 denote a second pair of the parameters, wherein n denotes the number of pumps, ω denotes a speed of the at least one of the n running pumps, and Q denotes the flow.