Method and apparatus for power management of asset tracking system
First Claim
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1. An apparatus for use in controlling the state of a power supply in a mobile asset comprising:
- a motion sensor for sensing vibration or motion, the motion sensor outputting one or more in-motion signals;
a memory for storing a last known stationary location of the asset;
a location device for identifying a current location of the asset; and
a power controller for;
determining whether said asset is in an In_Motion state based on said in-motion signals, causing said location device to identify a current location of the asset if it is determined that said asset is in an In_Motion state; and
determining, if it is determined that said asset is in an In_Motion state, whether the asset is in an In_Transit state by comparing the current location of the asset and the last known stationary location, and selecting a power consumption mode for the power supply based on the determination.
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Abstract
A technique for controlling the state of a power supply in a mobile asset such as a cargo trailer. The technique detects motion status such as may be provided by a vibration sensor. The motion status signal is filtered by other signals, such as with inputs from a global positioning system sensor, and is then further used to select a power consumption mode. The power consumption mode may be further controlled based on configuration information that may indicate that a vibration source such as a refrigeration unit is present on the trailer.
36 Citations
20 Claims
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1. An apparatus for use in controlling the state of a power supply in a mobile asset comprising:
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a motion sensor for sensing vibration or motion, the motion sensor outputting one or more in-motion signals; a memory for storing a last known stationary location of the asset; a location device for identifying a current location of the asset; and a power controller for; determining whether said asset is in an In_Motion state based on said in-motion signals, causing said location device to identify a current location of the asset if it is determined that said asset is in an In_Motion state; and determining, if it is determined that said asset is in an In_Motion state, whether the asset is in an In_Transit state by comparing the current location of the asset and the last known stationary location, and selecting a power consumption mode for the power supply based on the determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for use in controlling the state of a power supply in a mobile asset comprising:
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storing a last known stationary location of the asset; enabling a motion sensor on the asset; monitoring the motion sensor output; determining whether the asset is in an In_Motion state based on the motion sensor output; if it is determined that said asset is in an In_Motion state, identifying a current location of the asset using a location device, and determining whether the asset is in an In_Transit state by comparing the current location of the asset with the last known stationary location; and selecting a power consumption power consumption mode for the power supply based on the in-transit determination. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification