Compressor control apparatus

• US 7,556,478 B2
• Filed: 06/30/2004
• Issued: 07/07/2009
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: MAT Industries, LLC (MAT Holdings, Inc.)
• Original Assignee: Campbell Hausfeld/Scott Fetzer Company (Berkshire Hathaway Incorporated)
• Inventors: Humpert, Brian T., Klein, Christopher D.
• Primary Examiner(s): Freay; Charles G
• Assistant Examiner(s): Hamo; Patrick
• Application Number:
  US10/880,673
• Publication Number:
  US 20060002800A1
• Time in Patent Office: 1,833 Days
• Field of Search: 417/44.2, 417/44.1
• US Class Current: 417/44.2
• CPC Class Codes: F04B 2205/05 Pressure after the pump outlet
• CPC Class Codes: F04B 35/04 the means being electric
• CPC Class Codes: F04B 49/022 by means of pressure
• CPC Class Codes: Y10T 137/2607 With pressure reducing inlet valve

Abstract

A control device is provided for use with a pneumatic pump for generating output pressure, a pressure sensor for indicating the level of the output pressure, and an input device for receiving a target pressure level input by a user. The control device is configured to monitor the sensed output pressure during a pressurizing condition in which the pump provides increasing output pressure. The control device is further configured to maintain the pressurizing condition while the level of the sensed output pressure increases past the target pressure level, and to terminate the pressurizing condition in response to the sensed output pressure increasing to a level that exceeds the target pressure level by a predetermined differential value.

Claims

1. An apparatus for use with a pneumatic pump for generating output pressure, a conduit for transmitting the output pressure to a pneumatic reservoir, a pressure sensor for indicating the level of the output pressure, and an input device for receiving a target pressure level input by a user, the apparatus comprising:

a control device that is configured to;

(a) monitor the sensed output pressure during a pressurizing condition in which the pump provides increasing output pressure;

(b) maintain the pressurizing condition while the level of the sensed output pressure increases past the target pressure level; and

(c) terminate the pressurizing condition in response to the sensed output pressure increasing to a level that exceeds the target pressure level by a predetermined differential value that corresponds to a predetermined dynamic pressure drop in the conduit.

2. An apparatus as defined in claim 1 wherein the predetermined differential value is equal or approximately equal to the predetermined dynamic pressure drop.

3. An apparatus as defined in claim 1 wherein the conduit comprises a hose.

4. An apparatus as defined in claim 1 wherein the control device is configured to terminate the pressurizing condition by turning off the pump.

5. An apparatus as defined in claim 1 further comprising a pressure display device that is operative in response to the sensed output pressure, and wherein the control device is configured for the pressure display device to display a pressure level that is less than the level of the sensed output pressure in the amount of the differential value.

6. An apparatus as defined in claim 5 wherein the control device is further configured for the pressure display device to display the actual level of a static pressure sensed by the pressure sensor when the pressurizing condition has been terminated by the control device.

7. An apparatus as defined in claim 1 wherein the control device is operatively interconnected with the pump, the conduit, the pressure sensor and the input device.

8. A portable air compressor including the apparatus of claim 7.

16. A portable air compressor including the apparatus of claim 1.

9. An apparatus for use with a pneumatic pump for generating output pressure, a conduit for transmitting the output pressure to a pneumatic reservoir, a pressure sensor for indicating the level of the output pressure, and an input device for receiving a target pressure level input by a user, the apparatus comprising:

a control device that is configured to;

(a) determine an elevated pressure level by adding a predetermined differential value to the target pressure level, wherein the predetermined differential value corresponds to a predetermined dynamic pressure drop in the conduit;

(b) monitor the sensed output pressure during a pressurizing condition in which the pump provides increasing output pressure;

(c) maintain the pressurizing condition while the level of the sensed output pressure increases past the target pressure level; and

(d) terminate the pressurizing condition in response to the sensed output pressure increasing to the elevated pressure level.

10. An apparatus as defined in claim 9 wherein the predetermined differential value is equal or approximately equal to the predetermined dynamic pressure drop.

11. An apparatus as defined in claim 9 wherein the conduit comprises a hose.

12. An apparatus as defined in claim 9 wherein the control device is configured to terminate the pressurizing condition by turning off the pump.

13. An apparatus as defined in claim 9 further comprising a pressure display device that is operative in response to the sensed output pressure, and wherein the control device is configured for the pressure display device to display a pressure level that is less than the level of the sensed output pressure in the amount of the differential value.

14. An apparatus as defined in claim 13 wherein the control device is further configured for the pressure display device to display the actual value of a static pressure sensed by the pressure sensor when the pressurizing condition has been terminated by the control device.

15. An apparatus as defined in claim 9 wherein the control device is operatively interconnected with the pump, the conduit, the pressure sensor and the input device.

17. An apparatus for use with a pneumatic pump for generating output pressure, a conduit for transmitting the output pressure to a pneumatic reservoir, a pressure sensor for indicating the level of the output pressure, and an input device for receiving a target pressure level input by a user, the apparatus comprising:

a control device that is configured to;

(a) monitor the sensed output pressure during a pressurizing condition in which the pump provides increasing output pressure;

(b) determine and monitor a reduced pressure level by subtracting a predetermined differential value from the level of the sensed output pressure as the level of the sensed output pressure increases, wherein the predetermined differential value corresponds to a predetermined dynamic pressure drop in the conduit;

(c) maintain the pressurizing condition while the level of the sensed output pressure increases past the target pressure level; and

(d) terminate the pressurizing condition in response to the reduced pressure level increasing to the target pressure level.

18. An apparatus as defined in claim 17 wherein the predetermined differential value is equal or approximately equal to the predetermined dynamic pressure drop.

19. An apparatus as defined in claim 17 wherein the conduit comprises a hose.

20. An apparatus as defined in claim 17 wherein the control device is configured to terminate the pressurizing condition by turning off the pump.

21. An apparatus as defined in claim 17 further comprising a pressure display device that is operative in response to the output pressure, and wherein the control device is configured for the pressure display device to display the reduced pressure level.

22. An apparatus as defined in claim 21 wherein the control device is further configured for the pressure display device to display the actual value of a static pressure sensed by the pressure sensor when the pressurizing condition has been terminated by the control device.

23. An apparatus as defined in claim 17 wherein the control device is operatively interconnected with the pump, the conduit, the pressure sensor and the input device.

24. A portable air compressor including the apparatus of claim 17.

25. An apparatus for use with a pneumatic pump for generating output pressure, a conduit for transmitting the output pressure to a pneumatic reservoir, a pressure sensor for indicating the level of the output pressure, and an input device for receiving a target pressure level input by a user, the apparatus comprising:

means for;

(a) monitoring the sensed output pressure during a pressurizing condition in which the pump provides increasing output pressure;

(b) maintaining the pressurizing condition while the level of the sensed output pressure increases past the target pressure level; and

(c) terminating the pressurizing condition in response to the sensed output pressure increasing to a level that exceeds the target pressure level by a predetermined differential value that corresponds to a predetermined dynamic pressure drop in the conduit.

26. An apparatus as defined in claim 25 wherein the predetermined differential value is equal or approximately equal to the predetermined dynamic pressure drop.

27. An apparatus as defined in claim 25 wherein the conduit comprises a hose.

28. An apparatus as defined in claim 25 including means for terminating the pressurizing condition by turning off the pump.

29. An apparatus as defined in claim 25 further comprising means for displaying a pressure level that is less than the level of the sensed output pressure in the amount of the differential value.

30. An apparatus as defined in claim 29 including means for displaying the actual value of a static pressure sensed by the pressure sensor when the pressurizing condition has been terminated by the control device.

31. An apparatus as defined in claim 25 wherein the means for monitoring, maintaining and terminating is operatively interconnected with the pump, the conduit, the pressure sensor and the input device.

32. A portable air compressor including the means of claim 25.