Mobile refrigeration system and method of detecting sensor failures therein
First Claim
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1. A mobile refrigeration system comprising:
- an engine;
a compressor operable in response to the engine to produce a flow of refrigerant;
an evaporator receiving the flow of refrigerant;
a first temperature sensor positioned to measure a first temperature;
a second temperature sensor positioned to measure a second temperature; and
a controller operable to detect a failure of one of the first temperature sensor and the second temperature sensor by calculating a temperature difference between the measured first temperature and the measured second temperature and comparing the temperature difference to a predetermined value.
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Abstract
A mobile refrigeration system that includes an engine and a compressor that is operable in response to the engine to produce a flow of refrigerant. An evaporator receives the flow of refrigerant and a first temperature sensor is positioned to measure a first temperature. A second temperature sensor is positioned to measure a second temperature and a controller is operable to detect a failure of one of the first temperature sensor and the second temperature sensor by calculating a temperature difference between the measured first temperature and the measured second temperature and comparing the temperature difference to a predetermined value.
43 Citations
30 Claims
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1. A mobile refrigeration system comprising:
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an engine;
a compressor operable in response to the engine to produce a flow of refrigerant;
an evaporator receiving the flow of refrigerant;
a first temperature sensor positioned to measure a first temperature;
a second temperature sensor positioned to measure a second temperature; and
a controller operable to detect a failure of one of the first temperature sensor and the second temperature sensor by calculating a temperature difference between the measured first temperature and the measured second temperature and comparing the temperature difference to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile refrigeration system comprising:
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an engine;
a compressor operable in response to the engine to produce a flow of refrigerant;
an evaporator receiving the flow of refrigerant;
a first temperature sensor positioned to measure a first temperature;
a first jump counter associated with the first temperature sensor and operable to increment in response to the measured first temperature;
a second temperature sensor positioned to measure a second temperature;
a second jump counter associated with the second temperature sensor and operable to increment in response to the measured second temperature; and
a controller operable to detect a failure of one of the first temperature sensor and the second temperature sensor by comparing the difference between the measured first temperature and the measured second temperature and determining which of the first jump counter and the second jump counter has incremented. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of detecting a sensor failure comprising:
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positioning a first sensor to measure a first temperature;
positioning a second sensor to measure a second temperature;
associating a first jump counter with the first sensor;
associating a second jump counter with the second sensor;
calculating a temperature difference between the first measured temperature and the second measured temperature;
determining the value of the first jump counter;
determining the value of the second jump counter;
flagging the first sensor as failed in response to a temperature difference greater than a predetermined value and a first jump counter value greater than a first failure value; and
flagging the second sensor as failed in response to a temperature difference greater than a predetermined value and a second jump counter value greater than a second failure value. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification