Techniques to provide a low capacity notification for an energy store device

• US 9,851,410 B2
• Filed: 11/24/2014
• Issued: 12/26/2017
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Landis+Gyr Technology, Inc. (Landis+Gyr Group AG)
• Original Assignee: Landis+Gyr Innovations Incorporated (Landis+Gyr Group AG)
• Inventors: Lee, Tou, Goteti, Raghav
• Primary Examiner(s): Hollington, Jermele M
• Application Number:
  US14/551,433
• Publication Number:
  US 20160146892A1
• Time in Patent Office: 1,128 Days
• Field of Search: 324427
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3835 involving only voltage measurements

Abstract

Disclosed are various systems and methods related to forecasting a low capacity state in an energy storage device of a node. A voltage is measured for the energy storage device of the node based upon measurement criteria. A counter for the node is adjusted based on the measured voltage, where the counter represents a history of instances of previous measurements of the voltage with respect to a voltage limit. The counter is adjusted in one direction if the measured voltage is below the voltage limit, and the counter is adjusted in the opposite direction if the measured voltage meets the voltage limit. If the counter meets a low capacity threshold, a low capacity condition is activated for the node. If the counter fails to meet the low capacity threshold, the value of the counter is stored for subsequent use during the next evaluation of the energy storage device.

Claims

1. A method for determining a low capacity condition for an energy storage device of a node in a network, comprising:

determining whether to initiate a voltage measurement for the energy storage device based on measurement criteria that specifies a maximum number of voltage measurements within a time period; and

when a number of voltage measurements taken is within the maximum number of voltage measurements within the time period;

measuring a voltage for the energy storage device during transmission of data to the network;

after measuring the voltage for the energy storage device, adjusting a counter for the node based on the measured voltage, wherein (i) the counter is adjusted in one direction when the measured voltage is below a voltage limit, and (ii) the counter is adjusted in an opposite direction when the measured voltage meets the voltage limit;

comparing the counter to a low capacity threshold, wherein the low capacity threshold corresponds to a predetermined number of measurements below the voltage limit in excess of a number of measurements that meet the voltage limit;

when the counter meets the low capacity threshold;

determining that the low capacity condition for the energy storage device exists; and

transmitting, via the network, a notification for the low capacity condition of the node; and

when the counter is below the low capacity threshold, storing a value of the counter for use with a next voltage measurement.

2. The method of claim 1, wherein the measurement criteria further specifies that the voltage measurement is initiated during one or more activities of the node.

3. The method of claim 2, wherein the one or more activities includes transmission of preamble data via the network.

4. The method of claim 1, wherein the node is a utility meter deployed as part of an advanced metering infrastructure (AMI) system.

5. The method of claim 1, wherein at least one of (i) the low capacity threshold and (ii) the maximum number of voltage measurements within the time period are configurable.

6. The method of claim 1, wherein said measuring the voltage comprises taking a plurality of qualification measurements of the voltage of the energy storage device, wherein said adjusting the counter comprises (i) adjusting the counter once in the one direction when a threshold number of the qualification measurements are below the voltage limit, and (ii) adjusting the counter once in the opposite direction when the threshold number of the qualification measurements meets or exceeds the voltage limit.

7. The method of claim 1, wherein the counter includes a pass limit such that said adjusting the counter in the opposite direction occurs when (i) the measured voltage meets or exceeds the voltage limit, and (ii) the counter does not meet the pass limit.

8. The method of claim 1, further comprising activating or deactivating an indicator on the node in response to the low capacity condition of the node.

9. A non-transitory computer-readable medium embodying a program executable by a processor of a node in a network, comprising code for:

determining whether to initiate a voltage measurement for an energy storage device of the node based on measurement criteria that specifies a maximum number of voltage measurements within a time period; and

when a number of voltage measurements taken is within the maximum number of voltage measurements within the time period;

measuring a voltage for the energy storage device during transmission of data to the network;

after measuring the voltage for the energy storage device, adjusting a counter for the node based on the measured voltage, wherein (i) the counter is adjusted in one direction when the measured voltage is below a voltage limit, and (ii) the counter is adjusted in an opposite direction when the measured voltage meets the voltage limit; and

comparing the counter to a low capacity threshold, wherein the low capacity threshold corresponds to a predetermined number of measurements below the voltage limit in excess of a number of measurements that meet the voltage limit;

when the counter meets the low capacity threshold;

determining that a low capacity condition for the energy storage device exists; and

transmitting, via the network, a notification for the low capacity condition of the node; and

when the counter is below the low capacity threshold, storing a value of the counter for use with a next voltage measurement.

10. The non-transitory computer-readable medium of claim 9, wherein the counter includes a pass limit such that said adjusting the counter in the opposite direction occurs when (i) the measured voltage meets the voltage limit, and (ii) the counter does not meet the pass limit.

11. The non-transitory computer-readable medium of claim 9, wherein the measurement criteria further comprises at least one of:

a minimum amount of time since the previous measurement of the voltage, a minimum number of measurements within a time period, and one or more scheduled measurement intervals.

12. The non-transitory computer-readable medium of claim 9, wherein the node is a utility meter deployed as part of an advanced metering infrastructure (AMI) system.

13. The non-transitory computer-readable medium of claim 9, wherein said measuring the voltage comprises a plurality of qualification measurements of the voltage of the energy storage device within a time interval, said adjusting the counter comprises (i) adjusting the counter once in the one direction when a threshold number of the qualification measurements are below the voltage limit, and (ii) adjusting the counter once in the opposite direction when the threshold number of the qualification measurements meet the voltage limit.