Method for the automatic control of the locking clutches of an all-wheel driven vehicle, and vehicle with articulated-vehicle steering and lockable differentials
First Claim
1. In an all-wheel driven vehicle having a plurality of respective differentials each having an input shaft, two output shafts, and a pulse transmitter associated with each output shaft for determining a measured slip signal for each respective differential which initiates the driving of a locking clutch of the respective differential when the measured slip signal exceeds a threshold value, a method for the automatic control of the locking clutch of each of the respective differentials comprising:
- (a) determining a first steering value;
(b) periodically measuring steering value over time so as to determine a change in steering value with respect to the first steering value;
(c) determining an apparent slip from the change in steering value where the apparent slip corresponds to a twisting between the output shafts of a respective differential;
(d) comparing the apparent slip with the threshold value to determine corrected threshold values from the threshold value and the apparent slip; and
(e) comparing the measured slip signal for a respective differential with the corrected threshold values wherein the driving of the locking clutch of the respective differential is initiated when the measured slip signal exceeds the corrected threshold values.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for the automatic locking of the differentials of an all-wheel driven vehicle, slip signals being formed which, as soon as they exceed a threshold value, initiate the driving of the respective differentials. In order to take into account the influence of the steering rolling radius, the change in the steering value is ascertained. From this, using a function determined by the geometry of the vehicle, an apparent slip is ascertained. From the respective apparent slip, corrected threshold values are determined and measured slip signals are compared with the corrected threshold values and, if necessary, the driving of the respective differential is initiated. The method can also be used on a vehicle having articulated-vehicle steering.
27 Citations
8 Claims
-
1. In an all-wheel driven vehicle having a plurality of respective differentials each having an input shaft, two output shafts, and a pulse transmitter associated with each output shaft for determining a measured slip signal for each respective differential which initiates the driving of a locking clutch of the respective differential when the measured slip signal exceeds a threshold value, a method for the automatic control of the locking clutch of each of the respective differentials comprising:
-
(a) determining a first steering value; (b) periodically measuring steering value over time so as to determine a change in steering value with respect to the first steering value; (c) determining an apparent slip from the change in steering value where the apparent slip corresponds to a twisting between the output shafts of a respective differential; (d) comparing the apparent slip with the threshold value to determine corrected threshold values from the threshold value and the apparent slip; and (e) comparing the measured slip signal for a respective differential with the corrected threshold values wherein the driving of the locking clutch of the respective differential is initiated when the measured slip signal exceeds the corrected threshold values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An all-wheel driven vehicle having articulated-vehicle steering and lockable differentials, which are locked if slip signals exceed specific threshold values, wherein the threshold values are corrected by an apparent slip corresponding to the change in the articulation angle.
Specification