Apparatus for electronically-controlled variable flow inlets and electronically-controlled pneumatic inlet modulation of compressor systems

1. A system for controlling flow of air into an air compressor of an air compressor system that is part of a mobile utility machine, the system comprising:

a proportional solenoid valve configured to control flow of air through a supply air inlet into the air compressor in proportional response to sensed air pressure generated by the air compressor system for improved efficiency in compressor system load requirement; and

a controller that generates an electronic control signal proportionally responsive to the sensed air pressure for controlling the proportional solenoid valve;

wherein the controller is configured to generate the electronic control signal to be proportional to a difference between a preselected target pressure set point and the sensed air pressure; and

wherein the controller has programmatically adjustable variable ramp up and ramp down logic functions that depend on the measured difference between the sensed air pressure measured by the pressure sensor and the preselected target pressure set point.

2. The system of claim 1 , wherein the control signal controls the proportional solenoid valve to an open position that is proportional to the sensed air pressure.

3. The system of claim 1 , wherein the proportional solenoid valve partially opens to any of a plurality of partially open positions between a fully open position and a fully closed position in response to the electronic control signal generated by the controller.

4. A controller that generates an electronic control signal proportionally responsive to a sensed air pressure, the controller being operable so that:

the electronic control signal controls a proportional solenoid valve to an open position that is proportional to the sensed air pressure;

the controller receives a pressure signal indicative of the magnitude of the sensed air pressure and generates the electronic control signal for controlling the proportional solenoid valve to open in proportional response to the sensed air pressure;

the controller generates the electronic control signal to be proportional to a difference between a preselected target pressure set point and the sensed air pressure based on programmatically adjustable variable ramp up and ramp down logic functions that depend on the difference between the sensed air pressure and the preselected target pressure set point; and

the controller generates the electronic control signal with a range having an upper and lower limit which can be logically manipulated to limit pressure building capacity.

5. The controller of claim 4 , wherein the controller receives the sensed air pressure from a pressure sensor.

6. The controller of claim 4 , wherein the sensed air pressure is a service air pressure for delivery to a use load.

7. The controller of claim 6 , wherein the controller controls flow of supply air into an air compressor of an air compressor system.

8. The controller of claim 7 , wherein the supply air is at atmospheric pressure.

9. The controller of claim 4 , wherein the proportional solenoid valve controls a supply of system pressure provided to a compressor inlet valve to control an amount of opening of the compressor inlet valve proportional to the sensed air pressure.

10. A method of controlling flow of supply air into an air compressor of an air compressor system that is part of a mobile utility machine, the method comprising:

sensing an air pressure generated by the air compressor system; and

controlling an amount of opening of a proportional solenoid valve configured to control flow of supply air into the air compressor in proportional response to the sensed air pressure based on programmatically adjustable variable ramp up and ramp down logic functions that depend on a difference between the sensed air pressure and a preselected target pressure set point.

11. A method of air arc gouging with an air compressor-welder system that is part of a mobile utility machine, the air compressor welder system including an air compressor, a welder, a logic controller, and a proportional solenoid valve configured to control flow of supply air into the air compressor, the method comprising:

using the logic controller to select an operating mode for the air compressor-welder system;

sensing an air pressure generated by the air compressor welding system; and

controlling an amount of opening of the proportional solenoid valve in proportional response to the sensed air pressure based on programmatically adjustable variable ramp up and ramp down logic functions that depend on a difference between the sensed air pressure and a preselected target pressure set point.

12. The method of claim 11 , wherein the step of selecting a mode is done manually.

13. The method of claim 11 , wherein the step of selecting a mode is done automatically.

14. The method of claim 11 , further comprising limiting the air arc gouging by selecting a welding maximum limit.

15. A method of reducing battery usage from a portable multifunction air compressor system that is part of a mobile utility machine, the method comprising:

using a logic controller to select an operating mode of the portable multifunction air compressor system;

sensing an air pressure generated by an air compressor of the portable multifunction air compressor system; and

controlling an amount of opening of a proportional solenoid valve configured to control flow of supply air into the air compressor in proportional response to the sensed air pressure based on programmatically adjustable variable ramp up and ramp down logic functions that depend on a difference between the sensed air pressure and a preselected target pressure set point.

16. The method of claim 15 , wherein the step of selecting a mode is done manually.

17. The method of claim 15 , wherein the step of selecting a mode is done automatically.