Device for bringing up to speed a vehicle having an automatic transmission

Abstract

Device for starting up a vehicle equipped with an automatic transmission provided between a drive shaft ( 1 ) and a driven shaft ( 2 ) in a transmission housing ( 7 ) with a planetary gear ( 4 ) with a first gear ( 14 ) coupleable with the drive shaft ( 1 ), with a second gear ( 13, 15 ) coupleable with the driven shaft ( 2 ) and with the third gear ( 12 ), wherein the third gear ( 12 ) is connectable with the transmission housing ( 7 ) via a start-up brake (S), of which the brake force is controllable.

1 . Device for starting up a vehicle equipped with an automatic transmission provided between a drive shaft ( 1 ) and a driven shaft ( 2 ) in a transmission housing ( 7 ) 
 with a planetary gear ( 4 ) with a first gear ( 14 ) coupleable with the drive shaft ( 1 ), with a second gear ( 13 ,  15 ) coupleable with the driven shaft ( 2 ) and with a third gear ( 12 ),    thereby characterized, that the third gear ( 12 ) is coupleable with the transmission housing ( 7 ) via a start-up brake (S), of which the brake force is controllable.    
     
     
         2 . Device according to  claim 1 , thereby characterized, that the planetary gear is a simple planetary gear ( 4 ) with one sun gear ( 12 ) at least one planetary gear ( 13 ) and an internal gear ( 14 ), wherein the first gear is the internal gear ( 14 ), the second gear is the planetary gear ( 13 ) and the third gear is the sun gear ( 14 ).  
     
     
         3 . Device according to one of claims  1  or  2 , thereby characterized, that the planetary gear ( 4 ) is a component of the automatic transmission ( 26 ).  
     
     
         4 . Device according to  claim 3 , thereby characterized, that the planetary gear ( 4 ) is a previously in-place reduction gear stage ( 27 ) or a previously in-place step up stage of the automatic transmission ( 26 ).  
     
     
         5 . Device according to  claim 3  or  4 , thereby characterized, that the automatic transmission is a vehicle automatic transmission ( 26 ) according to Lepelletier.  
     
     
         6 . Device according to one of the preceding claims, thereby characterized, that the start-up brake is a friction brake (S), with controllable slip.  
     
     
         7 . Device according to one of the preceding claims, thereby characterized, that the brake force of the start-up brake (S) is controllable in such a manner, that the brake force at the beginning of the start-up process is smaller than at the end of the start-up process.  
     
     
         8 . Device according to  claim 7 , thereby characterized, that the brake force of the start-up brake (S) is controllable in such a manner, that the brake force at the beginning of the start-up process essentially disappears and that the start-up brake (S) at the end of the start-up process is arrested or is controlled for minimum slippage.  
     
     
         9 . Device according to one of claims  7  or  8 , thereby characterized, that the start-up element of the transmission is controllable by the brake force of the start-up brake (S) in such a manner, that the start-up acceleration from the beginning of the start-up process until the end of the start-up process is freely controllable by a regulator.  
     
     
         10 . Device according to one of claims  7 ,  8  or  9 , thereby characterized, that the brake force of the start-up brake (S) is controllable from outside the transmission.  
     
     
         11 . Automatic transmission ( 26 ), with a device ( 4 , S) according to one of the preceding claims.  
     
     
         12 . Process for operation of a device for starting up according to one of claims  1  through  6 , thereby characterized, that the driven rotation speed (N 19 , n F ) of the automatic transmission brake force of the start-up brake (S) is controlled in such a manner, that it is smaller at the beginning of the start-up process than at the end of the start-up process.  
     
     
         13 . Process according to  claim 12 , thereby characterized, that brake force of the start-up brake (S) is controllable in such a manner, that the brake force at the beginning of the start-up process essentially disappears and that the start-up brake at the end of the start-up process locks or is controlled for minimal slippage.  
     
     
         14 . Process according to  claim 12  or  13 , thereby characterized, that the start-up element of the transmission is controllable via the brake force of the start-up brake (S) in such a manner, that the start-up acceleration from the beginning of the start process to the end of the start-up process is freely selectable or controllable via a regulator.  
     
     
         15 . Process according to one of claims  12  through  14 , thereby characterized, that the brake force of the start-up brake (S) is controllable in such a manner, that the increase in the rotational speed n F  of the driven shaft ( 2 ) follows a pre-determined pattern.