Patent ID: 11919263
Assignee: CONTINENTAL REIFEN DEUTSCHLAND GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F  G | IPC B  F  G

Claim 0:
1. A method for the weight-dependent control of the internal pressure of a supporting body loaded by a weight load or payload, wherein the internal pressure is produced by means of an electric-motor-driven compressor, characterized in that the weight load or payload which is present and which acts on a supporting body in the form of a mass mLoad under the effect of acceleration due to gravity g is determined in that a reduction and a subsequent increase in the internal pressure take place, wherein the increase in the internal pressure causes the position of an application point of the weight load or payload to change by a position difference ΔZ, wherein the following further method steps are carried out:
during the increasing of the internal pressure by means of the compressor, the motor current ILoad of the drive motor of the compressor is measured with a constant motor voltage U and integrated over the time of the increase in pressure, wherein the electrical work WLoad which is necessary for the change in position is determined as a product of the motor voltage and integrated motor current,
the electrical WLoad is compared with a characteristic value of the electrical work W0 from a characteristic diagram in which the values for the electrical work for achieving a normal position or standard position of the application point under normal load are stored in accordance with a normal load acting in the form of a normal mass m0 under the effect of acceleration due to gravity g, and further parameters of the supporting body,
the change in position ΔZ, the difference in mass Am and the difference in payload ΔFZ are determined from the difference AW between WLoad and W0 by means of the relationships

ΔW=ΔFZ·ΔZ, and

mLOAD−m0=Δm, and

ΔFZ=g·Δm, and in turn the weight load or payload which is present after the pressure increase is determined therefrom, from the mass, m
    LOAD
  
  =
  
    
      
        U
        
          
            g
            ·
            Δ
          
          ⁢
          
            
          
          ⁢
          Z
        
      
      ⁡
      
        [
        
          
            ∫
            
              
            
            ⁢
            
              
                
                  I
                  LOAD
                
                ⁡
                
                  (
                  t
                  )
                
              
              ⁢
              dt
            
          
          -
          
            W
            0
          
        
        ]
      
    
    +
    
      m
      0, taking into account the acceleration due to gravity g,
after which the compressor is switched off in accordance with the weight load or payload which is determined in this way, when an internal pressure which is predefined for the determined weight load or payload on the basis of the parameters of the supporting body is reached.