System and method for providing automatic power control and torque boost
View Patent ↗Certain exemplary embodiments can provide for automatic power control and/or torque boost for retarding a machine. The automatic power control and/or torque boost can provide a control margin under retard. Certain exemplary embodiments comprise a method comprising: for a machine comprising a wheel drive system comprising a braking system, comparing an acceleration to a predetermined acceleration threshold; determining a dynamic maximum retard torque associated with the braking system based on said comparing activity; controlling a retard torque to no greater than the dynamic maximum retard torque; and affecting a retard power.
1. A system comprising:
for a machine comprising a wheel drive comprising an electric motor and an electric motor braking system, a determinator adapted to determine a dynamic maximum retard torque based on a comparison of an acceleration of the electric motor to a predetermined threshold; and a controller adapted to control a retard torque of the electric motor to no greater than the dynamic maximum retard torque.
2. A method comprising a plurality of activities, comprising:
for a machine comprising a wheel drive system comprising an electric motor and an electric motor braking system, comparing an acceleration of the electric motor to a predetermined acceleration threshold;
determining a dynamic maximum retard torque associated with the electric motor braking system based on said comparing activity; and responsive to a feedback metric, controlling a retard torque of the electric motor to no greater than the dynamic maximum retard torque; and
affecting a retard power of the electric motor.
3. The method of claim 2 , further comprising:
receiving the retard torque of the electric motor.
4. The method of claim 2 , further comprising:
measuring the retard torque of the electric motor.
5. The method of claim 2 , wherein the dynamic maximum retard torque is also based on a received retard setpoint for the machine.
6. The method of claim 2 , wherein the dynamic maximum retard torque is also based on a predetermined retard power limit.
7. The method of claim 2 , further comprising:
increasing the dynamic maximum retard torque temporarily to a predetermined level associated with a boost power that is above the predetermined retard power limit.
8. The method of claim 2 , further comprising:
contingent on a retard torque setpoint exceeding a predetermined threshold for a predetermined period of time, increasing the dynamic maximum retard torque temporarily to a predetermined level associated with a boost power that is above a predetermined retard power limit.
9. The method of claim 2 , wherein the dynamic maximum retard torque is associated with a power level less than a predetermined retard power limit.
10. The method of claim 2 , wherein the dynamic maximum retard torque is associated with a power level approximately equal to a predetermined retard power limit.
11. The method of claim 2 , wherein the dynamic maximum retard torque is associated with a power level above a predetermined retard power limit.
12. The method of claim 2 , wherein the dynamic maximum retard torque is related to a maximum retard power rating of at least one component of the electric motor braking system.
13. The method of claim 2 , further comprising:
receiving a speed of the electric motor.
14. The method of claim 2 , further comprising:
measuring a speed of the electric motor.
15. The method of claim 2 , further comprising:
determining the feedback metric.
16. The method of claim 2 , further comprising:
determining the feedback metric responsive to a speed of the electric motor and the retard torque.
17. The method of claim 2 , further comprising:
determining the feedback metric responsive to a retard power of the electric motor.
18. The method of claim 2 , further comprising:
determining a retard power of the electric motor.
19. The method of claim 2 , further comprising:
receiving a retard power of the electric motor.
20. The method of claim 2 , further comprising:
determining a predetermined retard power limit of the electric motor braking system.
21. The method of claim 2 , further comprising:
receiving a predetermined retard power limit of the electric motor braking system.
22. The method of claim 2 , further comprising:
determining the feedback metric responsive to a predetermined retard power limit of the electric motor braking system.
23. The method of claim 2 , wherein the machine is a truck.
24. The method of claim 2 , wherein the machine is a mine haul truck.
25. A machine-readable medium comprising stored instructions for
for a machine comprising a wheel drive system comprising an electric motor and an electric motor braking system, comparing an acceleration of the electric motor to a predetermined acceleration threshold;
determining a dynamic maximum retard torque of the electric motor based on said comparing activity; and
responsive to a feedback metric, controlling a retard torque of the electric motor to no greater than the dynamic maximum retard torque associated with the wheel drive system.