Safety interface for Mercedes E-MAS system

This component is a module that works in concert with the control unit E-MAS (Electronically Controlled Multi Axle Steering) on Mercedes commercial vehicles equipped with a steerable third axle. It operates within a (Closed-Loop Safety System) and serves as a protection interface for the safe management of the auxiliary steering.

Technical specifications

• Supply voltage: 24 V.
• Interfaces: sensor inputs (actuator angle/position, speed, status)
• Communications: direct connection to the E-MAS
• Functions: electrical, logical and functional protection

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Functions

• The E-MAS control unit generates the steering control logic and the protection interface checks the safety conditions
• If everything is OK, the interface enables permission to the electrohydraulic pump and sends a return feedback to the E-MAS

Model applications

• Mercedes-Benz Actros/Atego/Axor/Econic (if equipped with a steerable rear axle).

Common faults

• No communication with the E-MAS control unit.
• The axle does not steer or remains locked at center, possibly with an auxiliary steering fault message on the instrument panel.
• Plausibility alarms between steering wheel command and axle position feedback.
• Power supply failures.

Final conclusions

The protection interface is a key module of the E-MAS system for the management of the control unit itself and the third axle.

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