Sensing system for detecting machine fluid degradation

• US 10,315,137 B2
• Filed: 11/18/2016
• Issued: 06/11/2019
• Est. Priority Date: 11/18/2016
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Spengler, Philip C., Ries, Jeffrey R., Abi-Akar, Hind
• Primary Examiner(s): Mui, Christine T
• Application Number:
  US15/355,576
• Publication Number:
  US 20180140978A1
• Time in Patent Office: 935 Days
• Field of Search: 422 50, 422 62, 422 681, 422 8201
• CPC Class Codes: B01D 2201/52 Filter identification means
• CPC Class Codes: B01D 2201/56 Wireless systems for monitoring the filter
• CPC Class Codes: B01D 35/143 Filter condition indicators
• CPC Class Codes: F01M 11/10 Indicating devices; Other safety devices
• CPC Class Codes: F01M 2011/1406 by considering acidity
• CPC Class Codes: F16N 2200/08 Acidity, pH-value
• CPC Class Codes: F16N 2260/18 necessity of changing oil
• CPC Class Codes: G01F 23/223 using a melting or dissolving material as a part of alarm-means
• CPC Class Codes: G01N 17/00 Investigating resistance of materials to the weather, to corrosion, or to light
• CPC Class Codes: G01N 33/2876 Total acid number

Abstract

A sensing system for detecting degradation of a machine fluid is disclosed. The sensing system may comprise a tag having electrical contacts. The tag may be configured to transmit a wireless signal when the electrical contacts are in electrical communication. The sensing system may further comprise a dissolvable element separating the electrical contacts and obstructing electrical communication between the electrical contacts. The dissolvable element may be configured to dissolve and allow electrical communication between the electrical contacts when an acid content of the machine fluid reaches a level indicative of the degradation of the machine fluid.

Claims

1. A sensing system for detecting degradation of a machine fluid, comprising:

a tag having electrical contacts, the tag being configured to transmit a wireless signal when the electrical contacts are in electrical communication; and

a dissolvable element between the electrical contacts and obstructing physical contact and the electrical communication between the electrical contacts, the dissolvable element being configured to at least partially dissolve when an acid content of the machine fluid reaches a level indicative of the degradation of the machine fluid, the dissolution of the dissolvable element initiating the electrical communication between the electrical contacts and the transmission of the wireless signal by allowing the electrical contacts to come into physical contact or by allowing the machine fluid to flow between the electrical contacts, the wireless signal transmitted by the tag indicating the degradation of the machine fluid.

2. The sensing system of claim 1, wherein the dissolvable element encapsulates the tag.

3. The sensing system of claim 1, wherein the dissolvable element is a disk-shaped structure positioned between the electrical contacts.

4. The sensing system of claim 1, wherein the dissolvable element is formed from a compound selected from the group consisting of magnesium oxide, zinc oxide, cadmium oxide, and combinations thereof.

5. The sensing system of claim 1, wherein the machine fluid is selected from engine oil, transmission fluid, hydraulic fluid, and coolant fluid.

6. The sensing system of claim 1, wherein the tag is a passive radio frequency identification (RFID) chip.

7. The sensing system of claim 1, wherein the signal is a radio-frequency signal having a frequency ranging between about 2.4 gigahertz to about 2.485 gigahertz.

8. The sensing system of claim 1, wherein the signal is a radio-frequency signal having a frequency of about 2.4 gigahertz, 3.6 gigahertz, 4.9 gigahertz, 5 GHz, or 5.9 gigahertz.

9. The sensing system of claim 1, further comprising a remote reader configured to receive the signal from the tag, receipt of the signal from the tag indicating the degradation of the machine fluid.