WABCO TAILGUARD, Руководство пользователя

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5.2.1 Separate valves for vehicles with an ABS braking system
When the driver actuates the braking valve (2) on a towing vehicle equipped with an ABS braking system, the braking
pressure for the rear axle reaches the control input of the LSV regulator (9), which then adapts the braking pressure
to the load status of the vehicle. Its output pressure reaches the Tristop cylinders at the rear axle via the two ABS
solenoid valves (10).
To additionally enable autonomous braking actions, the standard configuration of this part of the ABS braking system
is extended with TailGUARD™ as follows:
„
Supply pressure for the rear axle is passed on via a branch line to an appropriately set charging valve (3). The
effect of this is that autonomous braking is only possible at a sufficient supply pressure of at least 7.3 bar.
„
From here, the pressure reaches a pressure limiting valve (4). This makes it possible to set the maximum braking
pressure that can be generated for an autonomous braking action. In the case of refuse collection vehicles, a
maximum braking pressure of approx. 3.8 bar has frequently proved to be most effective.
„
The braking pressure then passes through two solenoid valves (5) and (6) that are connected in series. These are
controlled by the ECU (1), and enable modulation of a braking pressure that is adapted to the vehicle speed. The
series circuit ensures that the vehicle is only braked when both valves are actuated. This prevents an autonomous
braking action from being triggered due to an electrical fault.
„
The modulated braking pressure is fed into the control input of the LSV regulator (9) via a two-way valve (7). From
here, the output pressure reaches the Tristop cylinders of the rear axle in the usual manner. The braking pressure
is also measured by a pressure sensor (8) that is likewise connected to the ECU (1).
Required components: Overview