Patent ID: 11926376
Assignee: THYSSENKRUPP PRESTA AG
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for determining a risk of instability of a calculation of an angle ϕ of a steering shaft of a motor vehicle, wherein a first gear wheel is fixed to the steering shaft and cooperates with at least a second gear wheel and a third gear wheel, wherein the second and third gear wheels are smaller than the first gear wheel, wherein a number of teeth of the first gear wheel is n, a number of teeth of the second gear wheel is m, and a number of teeth of the third gear wheel is m+1, the method comprising:
determining angles θ and ψ of the second and third gear wheels and the angle ϕ of the steering shaft according to an equation, ϕ
    =
    
      
        
          m
          *
          ψ
        
        +
        
          
            (
            
              m
              +
              1
            
            )
          
          *
          θ
        
        -
        
          
            (
            
              
                2
                ⁢
                m
              
              +
              1
            
            )
          
          *
          k
          *
          Ω
        
      
      
        2
        ⁢
        n
      
    
  
  ,, with Ω being an angle of a sensor range and with a whole number k given by, k
    =
    
      round
      ⁡
      
        (
        
          
            
              
                (
                
                  m
                  +
                  1
                
                )
              
              *
              θ
            
            -
            
              m
              *
              ψ
            
          
          Ω
        
        )
      
    
  
  ;, and
determining the risk of instability by calculating a stability margin t according to, t
    =
    
      k
      -
      
        (
        
          
            
              
                (
                
                  m
                  +
                  1
                
                )
              
              *
              θ
            
            -
            
              m
              *
              ψ
            
          
          Ω
        
        )
      
    
  
  ., and performing a self-calibration in the calculation of the angle ϕ of the steering shaft based on the stability margin t.