Method and device for regulation of a cooling fan drive on an internal combustion engine in a construction or working machine

Abstract

The invention relates to a method for regulation of a cooling fan drive on an internal combustion engine, in particular equipped with several independent cooling circuits, in a construction or working machine, whereby the power drain of the cooling fan drive is set to approximately zero during certain working stages of the construction and/or working and said power drain may be added to the capacity for the working stage.

1 . (Original) A method for regulating a fan drive ( 4 ) on an internal combustion engine ( 1 ), in particular provided with several independent cooling circuits ( 2 ,  3 ) and used in construction and/or working machines in that the power consumption of the fan drive ( 4 ) is set approximately to zero for predetermined operating sequences of the construction and/or working machine and that the fan power consumption is added to that of the operating sequence.  
     
     
         2 . (Original) The method according to  claim 1 , characterized in that at least two different set temperature values are adjusted for the cooling circuit ( 2 ,  3 ), wherein for predetermined operating sequences of the construction or working machine the one set temperature value is adjusted to a higher set temperature value with the aid of a switch ( 19 ) and a reversing switch ( 15 ) and that the operating capacity of the fan drive ( 4 ) is set to approximately zero.  
     
     
         3 . (Currently Amended) The method according to  claim 1  or  2 , characterized in that if several cooling circuits ( 2 ,  3 ) exist, at least two different set temperature values are adjusted for each cooling circuit ( 2 ,  3 ) via a joint control unit ( 10 ).  
     
     
         4 . (Currently Amended) The method according to one of the claims  claim 1  to  3 , characterized in that a set value/actual value temperature comparison is carried out with a μ controller-PI regulator ( 13 ,  14 ) for each cooling circuit ( 2 ,  3 ) and that the permissible adjustment value for each cooling circuit ( 2 ,  3 ) is determined.  
     
     
         5 . (Currently Amended) The method according to one of the claims  claim 1  to  4 , characterized in that a comparator ( 16 ) that operates jointly with the PI regulator(s) ( 13 ,  14 ) determines a maximum adjustment value from the individual adjustment value(s) and transmits this maximum adjustment value to a pulse width modulation stage ( 17 ) that is operatively connected to the control unit ( 10 ).  
     
     
         6 . (Currently Amended) The method according to one of the claims  claim 1  to  5 , characterized in that for a predetermined working movement of the construction and/or working machine, in particular for lifting the boom ( 6 ) of a hydraulic excavator, the set temperature values of all cooling circuits ( 2 ,  3 ) are raised essentially at the same time, thus causing the power consumption of the fan drive ( 4 ), particularly during the no-load operation of the fan wheel ( 5 ), to be set approximately to zero and the driving power of the fan drive ( 4 ) to be assigned to the movement sequence of the construction and/or working machine, in particular for increasing the lifting capacity of the boom ( 6 ).  
     
     
         7 . (Original) A device for regulating a fan drive ( 4 ) on an internal combustion engine ( 1 ), in particular provided with several independent cooling circuits ( 2 ,  3 ) and used in construction and/or working machines, said device comprising at least one reversing switch ( 15 ), at least one PI regulator ( 13 ,  14 ) for each cooling circuit ( 2 ,  3 ), at least one downstream-connected comparator ( 16 ), as well as at least one pulse width modulator ( 17 ) that is operatively connected to a control unit ( 10 ).  
     
     
         8 . (Original) The device according to  claim 7 , characterized in that the regulator ( 13 ,  14 ) is a μ controller-PI regulator.