Sensor subset selection for reduced bandwidth and computation requirements

• US 8,032,334 B2
• Filed: 12/22/2008
• Issued: 10/04/2011
• Est. Priority Date: 05/29/2007
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Geissler, Andrew J., McCreary, Hye-Young, Floyd, Michael S., Ghiasi, Soraya, Ware, Malcolm S., Silva, Guillermo J., Bieswanger, Andreas
• Primary Examiner(s): TEIXEIRA MOFFAT, JONATHAN CHARLES
• Application Number:
  US12/342,054
• Publication Number:
  US 20090099817A1
• Time in Patent Office: 1,016 Days
• Field of Search: 702/188
• US Class Current: 702/188
• CPC Class Codes: G06F 11/30 Monitoring

Abstract

A system for identifying a subset of sensors to sample to reduce the frequency of sensor access. The system determines rise times and records values for the sensors in the system. A time criticality of the sensors is determined based on the rise times. The system processes the sensors by first creating sensor subsets based on one or more constraints on the sensors. The system monitors the values of the sensors in a sensor subset and flags a sensor when it makes a determination that, prior to a next scheduled sampling of the sensor subset, the value of a sensor in the monitored sensor subset will exceed a threshold constraint. The system moves those flagged sensors to a second sensor subset which complies with the sensor'"'"'s constraints.

Claims

1. A data processing system for dynamically selecting sensor subsets for sampling based on time criticality, the data processing system comprising:

determining means for determining a rise time function of a time required for a sensor to go from a first predetermined value to a second predetermined value that define a range of interest for each of a plurality of sensors in a system;

recording means for recording values of the plurality of sensors;

determining means for determining a time criticality for each sensor in the plurality of sensors based on the determined rise time function of each sensor;

processing means for processing the plurality of sensors in the system, wherein the processing of the plurality of sensors further comprises;

creating means for creating sensor subsets within the plurality of sensors in the system based on one or more constraints of the plurality of sensors;

monitoring means for monitoring the values of sensors in a first sensor subset;

determining means, responsive to reading the values of the sensors in the first sensor subset, for determining whether a value of a sensor in the first sensor subset plus the determined rise time function of the sensor will exceed a threshold constraint prior to a next scheduled read of the first sensor subset;

flagging means, responsive to a determination that the value of the sensor in the first sensor subset plus the determined rise time function of the sensor will exceed the threshold constraint prior to the next scheduled read of the first sensor subset, for flagging the sensor; and

moving means for moving the flagged sensor to a second sensor subset which complies with the constraints on the flagged sensor.

2. A computer program product stored in a non-transitory computer readable storage medium encoded with computer instructions that are executable by a computer to perform a method for dynamically selecting sensor subsets for sampling based on time criticality, the method comprising:

determining a rise time function of a time required for a sensor to go from a first predetermined value to a second predetermined value that define a range of interest for each of a plurality of sensors in a system;

recording values of the plurality of sensors;

determining a time criticality for each sensor in the plurality of sensors based on the determined rise time function of each sensor;

processing the plurality of sensors in the system, wherein the processing of the plurality of sensors further comprises;

creating sensor subsets within the plurality of sensors in the system based on one or more constraints of the plurality of sensors;

monitoring the values of sensors in a first sensor subset;

responsive to reading the values of the sensors in the first sensor subset, determining whether a value of a sensor in the first sensor subset plus the determined rise time function of the sensor will exceed a threshold constraint prior to a next scheduled read of the first sensor subset;

responsive to a determination that the value of the sensor in the first sensor subset plus the determined rise time function of the sensor will exceed the threshold constraint prior to the next scheduled read of the first sensor subset, flagging the sensor; and

moving the flagged sensor to a second sensor subset which complies with the constraints on the flagged sensor.

3. The computer program product of claim 2, further comprising:

repeating processing of remaining sensors in the first sensor subset in response to a determination that the value of the sensor in the first sensor subset plus the determined rise time function of the sensor will not exceed the threshold constraint prior to the next scheduled read of the first sensor subset.

4. The computer program product of claim 2, wherein moving the flagged sensor to the second sensor subset further comprises:

changing a next scheduled read of the flagged sensor.

5. The computer program product of claim 2, wherein the determined rise time function provides an indication of how often to sample the sensor to ensure threshold constraints will not be exceeded.

6. The computer program product of claim 2, wherein monitoring the values of the sensors in the first sensor subset includes determining when to read the sensors to reduce frequency of sensor access.

7. The computer program product of claim 2, wherein the one or more constraints of the plurality of sensors include at least one of a location of the plurality of sensors on a bus, a bus speed, or if a sensor is part of a hard-wired sensor group which must be read simultaneously as a group.

8. The computer program product of claim 2, wherein the plurality of sensors in the system comprise a combination of different sensor types.

9. The computer program product of claim 2, wherein the time criticality is the determined rise time function.

10. The computer program product of claim 2, wherein sensors in the plurality of sensors in the system are sorted into different sensor subsets based on the determined rise time function of the time required for each of the plurality of sensors to go from the first predetermined value to the second predetermined value that define the range of interest for each of the plurality of sensors in the system.

11. The computer program product of claim 10, wherein the determined rise time function of each sensor in the plurality of sensors is used to determine a read ratio between reads of the different sensor subsets.

12. The computer program product of claim 11, wherein the different sensor subsets are scheduled to be read based on a multiple of a base read ratio.