Methods and systems for air compressor and engine driven control

Patent metadata

Field	Value
Publication number	US-10900485-B2
Application number	US-201715810824-A
Country	US
Kind code	B2
Filing date	Nov 13, 2017
Priority date	Nov 13, 2017
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

Power systems and methods of controlling an engine driven air compressor include an air compressor driven by an engine via a clutch. A first pressure sensor configured to sense a pressure level at an outlet of the air compressor. An inlet valve configured to close in response to the first pressure sensor sensing a pressure level above a first pressure level. In addition, a second pressure sensor to sense a pressure level below a second pressure level at a housing of the air compressor, wherein the clutch is configured to disengage in response to the second pressure level, wherein the first pressure level is higher than the second pressure level.

First claim

What is claimed is:

1. A method of controlling an engine driven air compressor, comprising:
measuring, at a first pressure sensor, a first pressure level that exceeds a threshold pressure level at an outlet of the air compressor;
adjusting an inlet valve of the air compressor in response to the first pressure level in order to limit an amount of air from being introduced into the air compressor;
activating a timer in response to the first pressure level exceeding the threshold pressure level;
controlling, via a controller, a clutch to disengage in response to expiration of the timer, the clutch configured to transfer power from the engine to the air compressor;
measuring a duration of time during which the clutch of the air compressor is disengaged;
determining, at the controller, that the duration exceeds a threshold time; and
controlling, via the controller, the engine to idle in response to the determination.

2. The method as defined in claim 1 , further comprising activating a bleed down valve in response to the first pressure level, which in turn controls the inlet valve to adjust.

3. The method as defined in claim 1 , further comprising controlling, by the controller, the engine to idle at a constant speed in response to the determination.

4. The method as defined in claim 2 , further comprising, in response to the first pressure sensor measuring a pressure level below the threshold pressure level:
controlling, via the controller, the inlet valve to open; and
controlling, via the controller, the clutch to engage.

5. The method as defined in claim 4 , further comprising deactivating the bleed down valve in response to measuring the pressure level below the threshold pressure level, which in turn controls the inlet valve to open.

6. The method as defined in claim 1 , further comprising adjusting, via a user interface, the threshold pressure level.

7. The method as defined in claim 1 , wherein the first pressure sensor is one of a pressure transducer or a pressure switch configured to generate a signal in response to the first pressure level, the controller further configured to:
receiving, at the controller, the signal; and
controlling, via the controller, the inlet valve in response to the signal.

8. A power system comprising:
an air compressor driven by an engine via a clutch;
a first pressure sensor configured to sense a pressure level at an outlet of the air compressor;
an inlet valve configured to close in response to the first pressure sensor sensing a pressure level above a first pressure level; and
a controller configured to:
measure a duration of time during which the clutch of the air compressor is disengaged;
determine whether the duration exceeds a threshold time duration; and
control the engine to idle in response to a determination that the time duration exceeds the threshold time duration.

9. The power system as defined in claim 8 , further comprising a bleed down valve configured to reduce a pressure within the air compressor in response to the first pressure level, which reduces a differential pressure and reduces a power needed to drive the air compressor.

10. The power system as defined in claim 8 , further comprising an electric generator driven by the engine via a generator clutch, the generator clutch to drive the electric generator independently of the air compressor.

11. The power system as defined in claim 10 , the controller further configured to:
determine whether the engine is driving an electric generator; and
control the engine to idle in response to determinations that the time duration exceeds the threshold time duration and the engine is not driving the electric generator.

12. The power system as defined in claim 11 , wherein the threshold time duration is between 30 seconds and 2 minutes.

13. A welding-type power system to control an engine driven air compressor, comprising:
a pressure sensor configured to measure a pressure level that exceeds a first pressure level at an outlet of the air compressor;
an inlet valve of the air compressor configured to close in response to the pressure level in order to stop air from being introduced into the air compressor; and
a controller configured to:
activate a timer; and
disengage a clutch in response to expiration of the timer, the clutch configured to transfer power from the engine to the air compressor; and

a bleed down valve configured to activate in response to the first pressure level, which in turn controls the inlet valve to close, wherein the bleed down valve lowers a pressure level in the air compressor from the first pressure level to a second pressure level.

14. The welding-type power system as defined in claim 13 , wherein, in response to the pressure sensor sensing a pressure level below the first pressure level, the bleed down valve is further configured to close, the inlet valve is configured to open, and the clutch is configured to engage to transfer power from the engine to the air compressor.

15. The welding-type power system as defined in claim 13 , wherein the pressure sensor is a transducer having an adjustable pressure range.

16. The welding-type power system as defined in claim 15 , the controller further configured to:
receive signals from the transducer corresponding to the first pressure level; and
control one or more of the bleed down valve, the inlet valve, a clutch, or the engine in response to the signals.

17. The welding-type power system as defined in claim 13 , wherein the time to expiration is between 30 seconds and 2 minutes.

Assignees

• Illinois Tool Works

Inventors

• Jochman Nathan Joe

Classifications

• F04C2210/1005

  Air · CPC title

• F04B35/002

  driven by internal combustion engines · CPC title

• F04C29/005

  Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions · CPC title

• F02D29/06

  peculiar to engines driving electric generators · CPC title

• B23K9/32

  Accessories · CPC title