Safe control unit for trailer couplings according to ISO 26262 up to ASIL-B
The content on this page was translated automatically.
Problem
- Traditional trailer hitches are rigid or manually removable.
- Electrically extendable trailer coupling offers high comfort.
- Control of an electromechanical system for a trailer coupling is relevant to safety.
- Control unit developed according to ISO 26262.
Solution approach
- Safety requirements of the control unit according to 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 for moving the clutch.
- Solenoid for mechanical locking.
- Limit switch for position detection of the mechanical system.
- Rotary encoder for position detection of the mechanics.
- Diversified detection system with limit switch and rotary encoder.
- Hall sensor for position detection of the solenoid.
- Redundant reading of signals from all sensors are used in the ReSCUV1.
- Software comparator implementation on FreeRTOS compares in real time the safety-relevant parameters of the system as well as sensor and actuator data.