Division 3.10
United Kingdom
Towed vehicle simulator: The device simulating the towed vehicle braking system shall include a hydraulic circuit provided with one female coupler as per ISO 5676-1983 and two identical hydraulic energy storage devices, fitted with spring elements and fulfilling the requirements reported in Figure 2. The simulator shall be manufactured according to the provisions of Figure 3.
Figure 1
Relationship between braking rate TM/FM and coupling head pressure pm
stabilised hydraulic pressure at the coupling head (kPa).
sum of braking forces at the periphery of all wheels of tractors
total normal static reaction of road surface on wheels of tractors
Figure 2
Characteristic of the towed vehicle simulator, depending on its maximum permissible mass
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diagram A B C for maximum permissible mass up to 14 tons.
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diagram A D E for maximum permissible mass higher than 14 tons
Figure 3
Towed vehicle simulator layout
hose of 2 000 mm length with one female coupler as per ISO 5676-1983;
tube of internal diameter 8 mm and length of 4 000 mm;
tube of internal diameter 8 mm and length of 1 000 mm;
tube of internal diameter 8 mm and length of 1 000 mm;
piston brake simulating elements;
spring adjusted elements acting on the total stroke of the piston;
spring adjusted elements acting only at the end of the pistons stroke.