The normal service brake model describes the ”guidance curve”.
The data that is necessary for the calculation of the ”guidance curve” is entered in the normal service brake model panel, see figure 10.
All properties of the normal service brake model are stored in the normal service brake model file (extension .nsbm). A normal service brake model that has not been saved after the latest modification is marked with an asterisk ’*’ in its title in the tab pane.
The upper speed limits of up to five speed sections in km∕h and the related deceleration values in m∕s2 (positive values). The last speed section has no upper speed limit. If you need less than five sections, type ’i’ into the speed limit text field(s) that you want to set to ”infinity” (see figure 10).
The values a_01 and a_12 in combination with the service brake deceleration used for the calculation of SBI_1 will determine which of the three sets of A_normal_service data will be used, see [Subset 026-3].
Typically you won’t use the actual service brake performance in the normal service brake model, but only some part of it, let’s say 50%. Thus in case of slopes, the resulting ”normal service brake model” will not reflect real operation anymore, because in real operation, the driver will apply more than 50% of the service brake effort when running downhill and less than 50% if running uphill. This can be adjusted by setting Kn+ and Kn- to values greater than 0m∕s2. In particular, setting Kn+ to 9.81m∕s2 will result in no effect of uphill gradients, setting Kn- to 9.81m∕s2 will result in no effect of downhill gradients.