Compressed Air Systems for Commercial Vehicles: 1
Basically, commercial-vehicle compressed- air systems comprise the compressed-air brake system itself and, depending upon the vehicle concerned, an Antilock Braking System (ABS), and a traction control system (TCS). In addition, according to requirements, equipment can also include a pneumatic (or air) suspension (for which electronic control (ELF) has recently been introduced), and a door-control system. Among other things, it is the job of the compressed- air brake system to reduce the vehicle's speed or to keep it constant on a downhill gradient.
The brake system is also used to brake the vehicle to a standstill, and to keep it stationary when it is stopped and the driver is not present. This also applies on a slope. Since the vehicle wheels cannot lock-up in panic braking situations, and as a result the vehicle remains steerable and does not break-out in a curve, the ABS antilock braking system improves even further on the compressed-air brake system, making it even more effective and safer. The TCS traction control prevents the driven wheels spinning during drive-off. This means that even under difficult conditions, for instance on a slippery road surface or with different degrees of road-surface grip between the wheels on the right of the vehicle and those on the left, the vehicle can move off without difficulty, even on a hill.
This manual deals with commercialvehicle compressed-air brake systems ? together with all their extensions and add-on units. It also explains how the brake-system components function together in an installation, how they are tested, and what installation versions are liable to be encountered on the market.