Environmental condition monitoring of a container
First Claim
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1. A device comprising:
- a temperature sensor;
a light sensor;
a rewriteable memory that stores environmental condition data including temperature data from the temperature sensor and indications of a door status of a container based on a light intensity measured by the light sensor;
a wireless communication module that transmits the stored environmental condition data including temperature data and indications of the door status of the container; and
a control module, wherein the control module reads a current temperature from the temperature sensor and a current light condition from the light sensor at periodic intervals, and at those periodic intervals in which at least one of the current temperature and the current light condition changes since a most-recent previous reading, the control module data records the current temperature and the current light condition as the environmental condition data in the rewriteable memory,wherein the control module issues an alert when a temperature reading is outside acceptable limits and the door status is a closed-door status, and the control module does not issue the alert when the temperature reading is outside acceptable limits and the door status is an open-door status.
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Abstract
In an embodiment, the invention is directed to a device including an environmental condition sensor, a light sensor; and a control module. The control module associates a light intensity above a defined threshold with an open-door status of a container. In another embodiment, a device includes an environmental condition sensor, a rewriteable memory that stores environmental condition data from the environmental condition sensor, and a wireless communication module that transmits stored environmental condition data. Embodiments of the invention may be useful to provide techniques for monitoring environmental conditions within a container, such as a refrigerated trailer.
83 Citations
15 Claims
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1. A device comprising:
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a temperature sensor; a light sensor; a rewriteable memory that stores environmental condition data including temperature data from the temperature sensor and indications of a door status of a container based on a light intensity measured by the light sensor; a wireless communication module that transmits the stored environmental condition data including temperature data and indications of the door status of the container; and a control module, wherein the control module reads a current temperature from the temperature sensor and a current light condition from the light sensor at periodic intervals, and at those periodic intervals in which at least one of the current temperature and the current light condition changes since a most-recent previous reading, the control module data records the current temperature and the current light condition as the environmental condition data in the rewriteable memory, wherein the control module issues an alert when a temperature reading is outside acceptable limits and the door status is a closed-door status, and the control module does not issue the alert when the temperature reading is outside acceptable limits and the door status is an open-door status. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device comprising:
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an environmental condition sensor that outputs an environmental condition signal representing an environmental condition measured by the environmental condition sensor; a light sensor that outputs a light intensity signal representing a light intensity measured by the light sensor; and a control module that receives the environmental condition signal and the light intensity signal, wherein the control module associates a light intensity above a defined threshold with an open-door status of a container, wherein the control module maintains a historical record of the environmental conditions measured by the environmental condition sensor and a door status of the container, and wherein the door status of the container is based on an evaluation of the light intensity signal received from the light sensor, wherein the control module issues an alert when a temperature reading is outside acceptable limits and the door status is a closed-door status, and the control module does not issue the alert when the temperature reading is outside acceptable limits and the door status is an open-door status. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification