Redundant Wheel Control Safety Net for Heavy-Duty Motion Management
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Solution Overview
Problem
The complexity of advanced wheel speed- or wheel slip-based motion management functions in heavy-duty vehicles poses a challenge in verifying overall system function against legacy safety standards, particularly in preventing wheel locking and undesired yaw motion.
Innovation Solution
A motion support device (MSD) control unit is configured to monitor wheel behavior and detect deviations from a defined capability range, triggering a control intervention function to maintain safe vehicle handling, thereby ensuring compliance with legacy safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If advanced wheel speed- or wheel slip-based motion management functions are implemented, then vehicle motion control capability is improved, but verification against legacy safety standards becomes more difficult
Solution Approach 1:
The control system is segmented into two independent parts: the advanced VMM function and the legacy safety function. The VMM can operate freely within defined capability ranges while the legacy safety function independently monitors wheel behavior and triggers intervention when limits are exceeded. This segmentation allows both advanced functionality and safety verification to coexist without requiring full system re-verification.
Solution Approach 2:
Capability ranges act as an intermediary layer between the VMM and legacy safety systems. The VMM sends wheel speed requests within these ranges, and the legacy safety system monitors actual wheel behavior against these same ranges. This intermediary structure enables integration of advanced control while maintaining compatibility with legacy safety standards.
2Productivity
If wheel speed requests are transmitted from VMM to MSD control units, then motion management efficiency is improved, but risk of wheel locking and undesired yaw motion increases
Solution Approach 1:
Capability ranges are defined in advance before VMM operation begins. These pre-established ranges incorporate safety margins that prevent wheel locking and undesired yaw motion. The VMM operates within these predetermined safe boundaries, eliminating the need for real-time safety calculations while maintaining high efficiency.
Solution Approach 2:
The legacy safety function continuously monitors actual wheel behavior (wheel speed and wheel slip) and compares it against the capability ranges. When wheel behavior approaches unsafe limits, the system provides feedback by triggering control intervention functions that override VMM commands, preventing wheel locking and yaw motion.
3Reliability
If legacy safety mechanisms are maintained intact, then safety standards compliance is ensured, but advanced functionality integration becomes more difficult
Solution Approach 1:
The system dynamically adapts by allowing the VMM to operate freely within capability ranges while the legacy safety function remains active as a supervisory layer. The interaction between these two functions is dynamic: VMM sends commands, legacy safety monitors execution, and intervention occurs only when necessary. This dynamic architecture enables advanced functionality integration without compromising safety compliance.
Data Source
AI summary
A motion support device, MSD, control unit for a heavy duty vehicle, configured to control one or more MSDs associated with a wheel on the vehicle, wherein the MSD control unit is configured to be communicatively coupled to a vehicle motion management, VMM, unit for receiving control commands from the VMM unit comprising wheel speed and/or wheel slip requests to control vehicle motion by the one or more MSDs. The MSD control unit is configured to obtain a capability range indicating a range of wheel behaviors of the wheel for which the VMM unit is allowed to influence the behavior of the wheel by the control commands, monitor wheel behavior and to detect if wheel behavior is outside of the capability range, and trigger a control intervention function in case the monitored wheel behavior is outside of the capability range.