Safe control unit for trailer couplings according to ISO 26262 up to ASIL-B
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Problem definition
- Traditional towbars are rigid or manually detachable.
- Electrically extendable towbars offer a high level of convenience.
- Activation of an electromechanical system for a trailer coupling is safety-relevant.
- Control unit developed in accordance with ISO 26262.
Solution approach
- Safety requirements of the control unit in accordance with ISO 26262 up to ASIL-B.
- 1oo2D ReSCUV1 safety processor.
- ReSCUV1 evaluation board as ECU platform.
- FreeRTOS as real-time operating system.
- Mechanical model for testing all functions.
- Sensors and actuators of the mechanical setup:
- DC motor to move the clutch.
- Lifting magnet for mechanical locking.
- Limit switches for detecting the position of the mechanics.
- Rotary encoder for detecting the position of the mechanism.
- Diverse detection system with limit switch and rotary encoder.
- Hall sensor for detecting the position of the solenoid.
- Redundant reading of signals from all sensors in the ReSCUV1.
- Software comparator implementation on FreeRTOS compares the safety-relevant parameters of the system as well as sensor and actuator data in real time.