Methods and systems for controlling a proportional integrator

1. A method for controlling a proportional integrator responsive to a command signal, comprising the steps of:

processing the command signal via a slew rate limiting circuit to determine whether to limit the command signal;

processing an output signal of the slew rate limiting circuit using one or more feedback parameters from the proportional integrator to provide a processed command signal;

processing the processed command signal and a controlled signal to provide an error signal; and

processing the error signal in the proportional integrator to provide a current command signal.

2. The method of claim 1 , wherein processing the command signal comprises processing the command signal in the slew rate limiting circuit have an upper limit value and a lower limit value.

3. The method of claim 2 , wherein the upper limit value and the lower limit value are computed using one or more feedback parameters from an error generating circuit.

4. The method of claim 3 , wherein the upper limit value and the lower limit value are computed using a previous sample of the processed command signal.

5. The method of claim 1 , further comprising processing the current command signal in a boost converter to provide the controlled voltage.

6. A method for controlling a proportional integrator to control an output voltage from a boost converter, the proportional integrator being responsive to a command signal, comprising the steps of:

processing the command signal via a slew rate limiting circuit to determine whether to limit the command signal;

processing an output signal of the slew rate limiting circuit using one or more feedback parameters from the proportional integrator to provide a processed command signal;

subtracting a signal to be controlled from the processed command signal to provide an error signal;

processing the error signal in the proportional integrator to provide a current command signal; and

processing the current command signal in the boost converter to provide the controlled signal.

7. The method of claim 1 , wherein processing the command signal comprises processing the command signal in the slew rate limiting circuit have an upper limit value and a lower limit value.

8. The method of claim 2 , wherein the upper limit value and the lower limit value are computed using are computed using a previous sample of the processed command signal.

9. A system, comprising:

a proportional integrator configured to process an error signal and provide a current command signal;

an error generating circuit configured to provide a processed command signal using one or more feedback parameters from the proportional integrator and to provide the error signal by subtracting a signal to be controlled from the processed command signal; and

a slew rate limiting circuit configured to receive a command signal and determine whether to limit the command signal prior to providing an output to the error generating circuit.

10. The system of claim 9 , wherein the slew rate limiting circuit limits the command signal between an upper limit and a lower limit.

11. The system of claim 10 , wherein the upper limit and the lower limit are computed using feedback parameters from the error generating circuit.

12. The system of claim 11 , where the upper limit and the lower limit are computed using a previous sample of the processed command signal.

13. The system of claim 9 , which includes a boost converter providing the signal to be controlled responsive current command signal.

14. The system of claim 13 , wherein the processed command signal is provided by a limiting circuit configured to determine whether to limit the output of the slew rate limiting circuit.

15. The system of claim 14 , wherein the limiting circuit has an upper limit and a lower limit.

16. The system of claim 15 , wherein the upper limit and the lower limit are computed using one or more feedback parameters from the proportional integrator.

17. A system, comprising:

an energy source;

a boost converter coupled to the energy source and providing an output voltage responsive to a current command signal;

an inverter coupled to the boost converter to process the output voltage and provide multiple phased currents to a multi-phase motor for a vehicle;

a controller coupled to the boost converter for providing the current command signal by processing a command signal in a current limit controller comprising:

a proportional integrator configured to process an error signal and provide a current command signal;

an error generating circuit configured to provide a processed command signal using one or more feedback parameters from the proportional integrator and to provide the error signal by subtracting a signal to be controlled from the processed command signal; and

a slew rate limiting circuit configured to receive a command signal and determine whether to limit the command signal prior to providing an output to the error generating circuit.

18. The system of claim 17 , wherein the slew rate limiting circuit limits the command signal between an upper limit and a lower limit.

19. The system of claim 18 , where the upper limit and the lower limit are computed using a previous sample of the processed command signal.

20. The system of claim 17 , wherein the energy source comprises a fuel cell.