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Embodiments of the present invention provide a system and method of valve control that eliminates, or at least substantially reduces, the shortcomings of prior art valve control systems and methods. More particularly, embodiments of the present invention provide systems and methods for multi-channe

Embodiments of the present invention provide a system and method of valve control that eliminates, or at least substantially reduces, the shortcomings of prior art valve control systems and methods. More particularly, embodiments of the present invention provide systems and methods for multi-channel valve control. One embodiment of the present invention includes a system of valve control that comprises a processor, a computer readable medium accessible by the processor and a set of computer instructions that are executable by the processor to output a first signal on a first channel indicating an initial force to be applied to a valve by an actuator and output a second signal on a second channel indicating a control force to be applied to the valve.

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What is claimed is: 1. A system of valve control comprising: a processor; a computer readable medium accessible by the processor; a set of computer instructions stored on the computer readable medium, wherein the set of computer instructions comprise instructions executable to: output a first sign

What is claimed is: 1. A system of valve control comprising: a processor; a computer readable medium accessible by the processor; a set of computer instructions stored on the computer readable medium, wherein the set of computer instructions comprise instructions executable to: output a first signal on a first channel indicating an initial force to be applied to a valve; and output a second signal on a second channel indicating a control force to be applied to the valve; wherein the initial force is substantially equal to a valve threshold. 2. The system of claim 1, wherein the control force is at least a portion of a remainder force. 3. The system of claim 2, wherein the remainder force is equal to a total force minus the initial force. 4. The system of claim 1, wherein the first signal is a first pulse width modulated signal having a pulse width proportional to the initial force and wherein the second signal is a second pulse width modulated signal having a pulse width proportional to the control force. 5. The system of claim 4, further comprising: a reference voltage source that produces a reference voltage; a first open drain buffer connected to the reference voltage source and the processor, wherein the first open drain buffer receives the first signal and outputs a third signal having a first voltage proportional to the initial force; and a second open drain buffer connected to the processor, wherein the second open drain buffer receives the second signal and outputs a fourth signal having a second voltage proportional to the control force. 6. The system of claim 5, further comprising a first summer, wherein the first summer subtracts the first voltage from the reference voltage to generate a fifth signal having a remainder voltage. 7. The system of claim 6, wherein the second open drain buffer is connected to a second summer and wherein the second open drain buffer generates the fourth signal based on the remainder voltage and the second signal. 8. The system of claim 6, further comprising: a first low pass filter that filters the third signal; and a second low pass filter that filters the fourth signal. 9. The system of claim 6, further comprising a second summer that adds the third signal and the fourth signal to generate a valve control signal. 10. The system of claim 9, further comprising an actuator control module connected to the second summer that translates the valve control signal into a valve force to be applied to the valve. 11. The system of claim 1, further comprising: a first digital to analog converter connected to the processor that converts the first signal into a third signal having a first voltage proportional to the initial force; and a second digital to analog converter connected to the processor that converts the second signal into a fourth signal that has a second voltage proportional to the control force. 12. The system of claim 11, further comprising a summer connected to the first digital to analog converter and the second digital to analog converter that adds the third signal and the forth signal to generate a valve control signal. 13. The system of claim 1, wherein the control force is indicated proportional to a remaining force. 14. The system of claim 1, wherein the computer instructions further comprise instructions executable to: receive a set point signal; output the first signal in response to the set point signal. 15. The system of claim 1, wherein the computer instructions further comprise instructions executable to: receive a set point signal; and generate the second signal based on the set point signal. 16. The system of claim 1, wherein the computer instructions further comprise instructions executable to change the first signal to indicate a new initial force. 17. The system of claim 16, wherein the system is a fluid control system further comprising a pressure sensor to measure pressure experienced by the fluid control system, wherein the processor monitors the pressure sensor, and wherein the computer instructions further comprise instructions executable to change the first signal in response to a change in pressure measured by the pressure sensor. 18. A method for valve control comprising: outputting a first signal on a first control channel indicating an initial force to be applied to the valve; outputting a second signal on a second control channel indicating a control force to be applied to the valve; and generating a third signal from the first signal and the second signal, wherein the third signal indicates a valve force equal to a sum of the initial force and the control force; wherein the initial force is substantially a valve threshold force. 19. The method of claim 18, further comprising indicating the initial force with a first pulse width modulated signal and indicating the control force with a second pulse width modulated signal. 20. The method of claim 18, further comprising: indicating the initial force with a first voltage proportional to the initial force; and indicating the control force with a second voltage proportional to the control force with respect to a remainder force. 21. The method of claim 20, wherein the remainder force is a total force minus the initial force. 22. The method of claim 18, further comprising changing the first signal to indicate a new initial force. 23. A method of controlling a valve, comprising: generating a reference signal with a reference voltage proportional to a total force; generating a first signal having a first voltage based on the reference voltage, wherein the first voltage is proportional to an initial force; generating a second signal having a remainder voltage; generating a second voltage based on the remainder voltage that is proportional to a control force; and generating a valve control signal having a control voltage equal to a sum of the first voltage and the second voltage. 24. The method of claim 23, further comprising: converting the valve control voltage into an applied force. 25. The method of claim 23, further comprising changing the first voltage to indicate a new initial force. 26. A valve control system comprising: a processor further comprising: a threshold output; and a control output; a computer readable medium accessible by the processor; a set of computer instructions stored on the computer readable medium, wherein the set of computer instructions comprise instructions executable to: output a first pulse width modulated signal on the threshold output indicating an initial force to be applied to a valve by an actuator; and output a second pulse width modulated signal on the control output indicating a control force to be applied to the valve; a reference voltage source; a first open drain buffer further comprising: a reference voltage input connected to the reference voltage source; a threshold input connected to the threshold output; a first open drain buffer output; a first low pass filter connected to the first open drain buffer output; a first summer having first summer inputs connected to the first low pass filter and the reference voltage source; a second open drain buffer further comprising: a remainder voltage input connected to the first summer output; a control input connected to the control output; a second open drain buffer output; a second low pass filter connected to the second open drain buffer output, the second low pass filter having a second low pass filter output; and a second summer connected to the second low pass filter output. 27. The control system of claim 26, further comprising a proportional actuator control module connected to an output of the second summer. 28. A method for controlling a valve comprising: generating a first pulse width modulated signal, with a pulse width proportional to an initial force; generating a second pulse width modulated signal, with a pulse width proportional to a control force; converting the first pulse width modulated signal into a first direct current signal having a first voltage proportional to the initial force based on the first pulse width modulated signal and a reference voltage; generating a remainder voltage; converting the second pulse width modulated signal into a second direct current signal having a second voltage proportional to the control force based on the second pulse width modulated signal and the remainder voltage; and summing the first direct current signal and the second direct current signal to generate a valve control signal. 29. A valve control system comprising: a processor further comprising: a threshold output; and a control output; a computer readable medium accessible by the processor; a set of computer instructions stored on the computer readable medium, wherein the set of computer instructions comprise instructions executable to: output a first signal on the threshold output indicating an initial force to be applied to a valve by an actuator; and output a second signal on the control output indicating a control force to be applied to the valve; a reference voltage source; a first digital to analog converter connected to the threshold output and the reference voltage source; a first summer connected to an output of the first digital to analog converter and the reference voltage source, wherein the first summer generates a remainder voltage; a second digital to analog converter connected to the control output and the first summer and the threshold output; and a second summer connected to outputs of the first digital to analog converter and the second digital to analog converter. 30. A method for controlling a valve comprising: generating a digital signal indicating an initial force; generating a second digital signal indicating a control force; converting the first digital signal at first digital to analog converter into a first direct current signal having a first voltage proportional to the initial force based on the first digital signal and a reference voltage; generating a remainder voltage; converting the second digital signal at a second digital to analog converter into a second direct current signal having a second voltage proportional to the control force based on the second digital signal and the remainder voltage; and summing the first direct current signal and the second direct current signal.