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- an opportunity to increase its average safe travelling speed;
- an extended service life of the tires;
- improved dynamics of acceleration and movement on slippery sections of
roads.
The following components are additionally installed in the drive: brake
pneumohydraulic booster 5 (see Fig. 135) three solenoid adjusting valves 10
(modulators), four induction senders 6, electronic control unit 16, two pilot lamps 3
and 4, cable 18 from solenoid valve, sender cables 9 and 12.
Fig. 135. Circuit Diagram of 4S/3M Anti-Blocking System Components:
1 – wheel brake cylinder; 2 – auxiliary brake cylinder; 3, 4 – pilot lamps; 5 – brake
pneumohydraulic booster; 6 – senders; 7 – sender clamping bush; 8 – impulse ring; 9, 12
– sender cables; 10 – adjusting solenoid valve; 11 – brake valve; 13 – air bottle of rear
brake circuit; 14 – air bottle of front brake circuit; 15 – air bottle of trailer brake circuit;
16 – electronic control unit; 17 – relay; 18 – cable from solenoid valve; 19 – extension
cable; 20 – electropneumatic valve
The first main circuit comprises bottle 4 (see Fig. 136), upper section of brake
valve 33, modulator 30, air booster 28, front axle wheel cylinders 31.
The second circuit consists of bottles 32, lower section of brake valve 33,
braking forces regulator 26, modulators 25, air boosters 23 and 24, wheel cylinders
21 of the rear and intermediate axles.
Air boosters 23 and 28 are mounted on the chassis frame under the cab and air
booster 24 is on the fuel tank.
The modulators are fastened near the air boosters.
Adjusting solenoid valve (modulator).
The modulator provides quick increase,
reduction or maintaining the pressure in the air cylinders of the air booster in the
course of slowing down the truck, depending on the control signals of the electronic
unit, and via the hydraulic part of the drive it generates the corresponding pressure
in the hydraulic cylinders of the service brakes, which govern the required braking
torque on the wheel.
