Patent ID: 7526975
Filing Date: 2009-05-05
Classification: F16H,Y10T

Abstract:
1. A method for reducing power assistance on a gearshifting unit during shifting of a vehicle transmission ( 6 ) comprising a main transmission part ( 10 ), which is manually shifted by a vehicle driver using a gearshift lever ( 16 ), a range change group transmission ( 14 ) which is shifted by valves ( 44 , 46 ) such that gearshifts of the range change group transmission ( 14 ) being manually preselectable by the vehicle driver via one or more switches ( 22 , 24 ) located on the gearshift lever ( 16 ), a power assistance device ( 74 ) for aiding in the shifting of gear steps in the main transmission part ( 10 ) and an electronic control device ( 20 ) which actuates the valves ( 44 , 46 ), the method comprising the steps of: initiating a shift of gear ratios in the range chance group transmission ( manually initiating a shift in the main transmission part ( detecting a neutral position of the manually shifted main transmission part ( only shifting the gear ratios in the range change group transmission ( engaging the power assistance after a delay of time from the detection of the neutral position of the manually shifted main transmission part (