Sensing system for detecting machine fluid degradation

Patent metadata

Field	Value
Publication number	US-10315137-B2
Application number	US-201615355576-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Nov 18, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

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.

First claim

What is claimed is:

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.

Assignees

• Caterpillar Inc

Inventors

• Spengler Philip C
• Ries Jeffrey R
• Abi-Akar Hind

Classifications

• B01D35/143 Primary

  Filter condition indicators · CPC title

• G01N17/00

  Investigating resistance of materials to the weather, to corrosion, or to light · CPC title

• B01D2201/56

  Wireless systems for monitoring the filter · CPC title

• F16N2200/08

  Acidity, pH-value · CPC title

• G01N33/2876

  Total acid number · CPC title