Vehicle motion management with a redundant wheel control safety net function
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.
1. A motion support device (MSD) control circuit for a heavy duty vehicle, configured to control one or more motion support devices (MSDs) associated with at least one wheel on the vehicle, the MSD control circuit is configured to be communicatively coupled to a vehicle motion management (VMM) circuit for receiving control commands from the VMM circuit comprising target wheel speed and/or target wheel slip requests to control vehicle motion by the one or more MSDs, wherein each target wheel speed or target wheel slip request corresponds to translation by the VMM of a desired target tire force to an equivalent target wheel slip and the target wheel slip is related to a difference between the target wheel speed and a vehicle speed, the MSD control circuit is configured to:
obtain a capability range indicating a range of wheel behaviors of the wheel for which the VMM circuit is allowed to influence the behavior of the wheel by the control commands,
monitor wheel behavior and detect if wheel behavior is outside of the capability range, and
trigger a control intervention function if the monitored wheel behavior is outside of the capability range.
2. The MSD control circuit of claim 1 , wherein the one or more MSDs comprise at least one service brake configured to generate negative torque by the wheel.
3. The MSD control circuit of claim 1 , wherein the one or more MSDs comprise at least one propulsion unit configured to generate a positive and/or a negative torque by the wheel.
4. The MSD control circuit of claim 1 , wherein the capability range comprises an upper limit on allowable positive and/or negative longitudinal wheel slip and/or wheel rotational speed.
5. The MSD control circuit of claim 1 , wherein the capability range comprises an upper limit on allowable positive and/or negative longitudinal wheel acceleration.
6. The MSD control circuit of claim 1 , wherein the capability range comprises an upper limit on allowable positive and/or negative vehicle yaw rate.
7. The MSD control circuit of claim 1 , wherein the capability range comprises a lower limit on allowable positive and/or negative longitudinal wheel slip and/or wheel rotational speed.
8. The MSD control circuit of claim 1 , wherein the capability range comprises a lower limit on allowable positive and/or negative longitudinal wheel acceleration.
9. The MSD control circuit of claim 1 , wherein the capability range comprises a lower limit on allowable positive and/or negative vehicle yaw rate.
10. The MSD control circuit of claim 1 , wherein the MSD control circuit is configured to receive wheel speed data associated with the wheel from a wheel speed sensor and to detect if wheel behavior is outside the capability range based on the wheel speed data.
11. The MSD control circuit of claim 1 , wherein the MSD control circuit is configured to obtain a fixed capability range as a parameter loaded from memory or received from an external configuration entity.
12. The MSD control circuit of claim 1 , wherein the MSD control circuit is configured to continuously obtain an updated capability range.
13. The MSD control circuit of claim 1 , wherein the control intervention function comprises executing an intervention function by one or more of the MSDs.
14. The MSD control circuit of claim 1 , wherein the control intervention function comprises triggering a request to an external arbitrator function for direct MSD control by the MSD control circuit.
15. The MSD control circuit of claim 1 , wherein the MSD control circuit is configured to monitor wheel behavior by filtering samples of wheel behavior over time and to detect if wheel behavior is outside of the capability range based on a result of the filtering.
16. A vehicle motion management (VMM) circuit configured to perform vehicle motion management for controlling motion of a heavy duty vehicle by one or more motion support devices (MSDs) associated with at least one wheel on the vehicle, the VMM circuit is configured to be communicatively coupled to an MSD control circuit for transmitting control commands comprising target wheel speed and/or target wheel slip requests to the MSD control circuit to control vehicle motion by the one or more MSDs, wherein each target wheel speed or target wheel slip request corresponds to translation by the VMM of a desired target tire force to an equivalent target wheel slip and the target wheel slip is related to a difference between the target wheel speed and a vehicle speed, the VMM circuit is configured to:
obtain a capability range indicating a range of wheel behaviors of the wheel for which the VMM circuit is allowed to influence the behavior of the wheel by the control commands, and
generate the control commands such that the wheel behavior is within the capability range.
17. The VMM circuit of claim 16 , comprising an arbitrator function configured to receive a request for direct MSD control by the MSD control circuit and to cede vehicle control to the MSD control circuit if wheel behavior is outside of a pre-determined wheel behavior safety range.
18. A method for controlling motion by a heavy duty vehicle, the method comprising:
configuring a motion support device (MSD) control circuit to control one or more motion support devices (MSDs) associated with at least one wheel on the vehicle,
configuring a vehicle motion management (VMM) circuit to perform vehicle motion management by the one or more MSDs via control commands transmitted to the MSD control circuit,
defining a capability range indicating a range of wheel behaviors of the wheel for which the VMM circuit is allowed to influence the behavior of the wheel by the control commands,
monitoring wheel behavior, and
triggering a control intervention function by the MSD control circuit responsive to the MSD control circuit detecting that the monitored wheel behavior is outside of the defined capability range;
wherein:
the control commands from the VMM circuit comprise target wheel speed and/or target wheel slip requests to control vehicle motion by the one or more MSDs; and
each target wheel speed or target wheel slip request corresponds to translation by the VMM of a desired target tire force to an equivalent target wheel slip and the target wheel slip is related to a difference between the target wheel speed and a vehicle speed.