Power control system and method

• US 7,944,186 B2
• Filed: 11/20/2009
• Issued: 05/17/2011
• Est. Priority Date: 09/23/2005
• Status: Active Grant

• Current Assignee: C E Niehoff & Company
• Original Assignee: C E Niehoff & Company
• Inventors: Jabaji, Shadi, Jabaji, Issam
• Primary Examiner(s): Patel; Tulsidas C.
• Assistant Examiner(s): Cuevas; Pedro J
• Application Number:
  US12/592,247
• Publication Number:
  US 20100090478A1
• Time in Patent Office: 543 Days
• Field of Search: 290/40.B, 290/52, 322/45
• US Class Current: 322/45
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: H02P 2101/30 for aircraft
• CPC Class Codes: H02P 9/04 Control effected upon non-electric prime mover and dependent upon electric output value of the generator

Abstract

A power control system comprises a prime mover and a generator driven by the prime mover. A control device is coupled with the prime mover and the generator wherein the control device ascertains a power level of the generator and varies an output power of the prime mover according to the power level. The control device measures a duty cycle of a generator output power controller to ascertain the generator power level and generates a signal to a prime mover controller so that the generator duty cycle remains within a pre-determined range. The power control system may include a transmission wherein the control device operation maybe conditioned on a state of the transmission. The power control system may include a speed converter coupled with the prime mover wherein the control device converts a speed of the prime mover according to the generator power level. The control device may operate to control an output power of the generator concurrently with controlling the output power of the prime mover.

Claims

1. A method for controlling a generator comprising a generator output power indicator, said generator is driven by a prime mover, said prime mover coupled with a prime mover controller capable of manipulating an output of the prime mover, said method comprising:

(a) measuring a duty cycle of the generator output power indicator, via a first line; and

(b) varying the output power of the prime mover, via the prime mover controller, by generating a signal to the prime mover controller, via a second line, according to said duty cycle.

2. The method of claim 1, wherein the step of measuring the duty cycle of the generator output power comprises receiving the duty cycle from a terminal capable of providing a signal indicative of the generator output power.

3. The method of claim 1, wherein the step of varying the output power comprises varying the output power so that the duty cycle remains substantially within a pre-determined range.

4. The method of claim 3, wherein the pre-determined range is substantially between 40% and 100%.

5. The method of claim 1, further comprising measuring an output voltage of the generator, via a third line, and varying the output power substantially proportional to a difference between the output voltage and a pre-determined voltage.

6. The method of claim 1, further comprising measuring an output voltage of the generator, via a third line, and varying the duty cycle, via a fourth line coupled with an output power controller of the generator, so that the output voltage is substantially equal to a regulation voltage.

7. The method of claim 6, further comprising measuring a temperature of at least one of battery, ambient air, generator, conductor, coolant, and output terminal, via a fifth line, and varying the regulation voltage according to the temperature.

8. The method of claim 6, wherein said generator output power controller comprises at least one of a field coil, a silicon controlled rectifier, and a metal oxide semiconductor field effect transistor.

9. The method of claim 1, further comprising sensing a state of a transmission, via a third line, and engaging the prime mover when the state of the transmission is substantially equivalent to at least one of a neutral and parked condition.

10. The method of claim 9, further comprising generating a signal, via the second line, to disengage the prime mover controller when the duty cycle is substantially below a pre-determined value.

11. The method of claim 10, wherein the pre-determined value is substantially equal to 28%.

12. The method of claim 1, further comprising communicating system information.

13. The method of claim 1, wherein the step of varying the output power of the prime mover comprises varying a pressure of the prime mover.

14. The method of claim 13, wherein the step of varying the pressure comprises varying the pressure in proportion to said duty cycle.

15. The method of claim 1, wherein the step of varying the output power of the prime mover comprises varying a fuel volume of the prime mover.

16. The method of claim 15, wherein the step of varying the fuel volume comprises varying the fuel volume in proportion to said duty cycle.

17. The method of claim 1, wherein the step of varying the output power of the prime mover comprises varying a rotational speed of the prime mover.

18. The method of claim 17, wherein the step of varying the rotational speed comprises varying the rotational speed in proportion to said duty cycle.

19. A method for controlling a generator comprising a generator output power controller, said generator is driven by a prime mover via a speed converter coupled with the prime mover and capable of converting a speed of the prime mover, said method comprising:

(a) measuring a duty cycle of the generator output power controller, via a first line; and

(b) converting the speed of the prime mover, via the speed converter, by generating a signal to the speed converter, via a second line, according to said duty cycle.

20. The method of claim 19, wherein the step of converting the speed of the prime mover comprises engaging a gear of the speed converter.