EB+ System Description

The EB+ Gen3 system provides electro-pneumatic control of the trailer brakes for full, semi and centre-axle trailers with built in electronic load sensing and anti-lock functions. It provides the necessary components to enable compatibility with either an electronically and pneumatically signalled or a pneumatically only signalled towing vehicle.

In addition to normal service brake control, EB+ Gen3 also contains a roll stability system. This uses a lateral accelerometer, in addition to the existing sensed variables, to determine if the vehicle is close to its roll threshold. Low-level brake test pulses are also used as part of the detection process and automatically commanded braking is used to slow the vehicle below the roll threshold. The accelerometer may be external or internal to the ECU.

As well as providing the means for brake control the controller also contains auxiliary channels capable of providing ancillary functions, such as reset-to-ride height and a power / diagnostic link for use by other systems.

The main system package consists of an electronic control unit (ECU) / modulator assembly, containing a brake apply solenoid, twin solenoid operated relay valve(s) and pressure sensors for monitoring the pneumatic control line, brake delivery, reservoir and air suspension pressure.

Externally the system comprises two or four wheel speed sensors and optionally a pressure sensor sensing the pneumatic control transmission. When used the pressure sensor should be situated before an emergency valve (REV or EV) if fitted.

Trailers fitted with the system may only be towed behind vehicles fitted with an ISO 7638 connector (either 7 or 5-pin). When connected with a 7-pin connector the system receives brake demand data via the CAN data line in accordance with ISO 11992. When connected with a 5-pin connector the system determines brake demand by sensing the pneumatic control transmission.

Optionally an ISO 1185 (24N) or ISO 12098 (15 pole) stop light power back-up connection can be fitted. This provides anti-lock braking control and optionally dynamic load sensing in situations where the ISO 7638 connection is not functioning and is not intended as a normal operating mode.

The apportionment of braking under varying vehicle load conditions is implemented in software. The load sensing parameters, from the brake calculation, are programmed into the ECU using the system diagnostic link.