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US 12,661,954 B2Granted
Method and system for low charge detection
AssigneeFord Global Technologies, LLC
InventorsRohan Shrivastava, James Rollinson, Jordan Mazaira, Shahid Bashir
Life of this patent
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Abstract
Methods and systems for assessing operation of a cooling system of an electric vehicle are described. In one example, a super heating temperature at an inlet of a compressor may be generated solely via a temperature sensor and a pressure sensor. The super heating temperature may be compared against a threshold super heating temperature to judge whether or not an amount of refrigerant in the cooling system is as expected.
Claims14
A method for operating a cooling system of a vehicle, comprising:
- reducing a speed of a compressor to operate the compressor at below a threshold speed;
- while operating the compressor below the threshold speed, generating an estimate of a super heating temperature of a refrigerant according to a pressure at an inlet side of the compressor and a temperature at the inlet side of the compressor;
- and
- deactivating the compressor in response to the estimate of the super heating temperature of the refrigerant exceeding a super heating threshold temperature while operating the compressor below the threshold speed.
1 more element
A method for operating a cooling system of a vehicle, comprising:
- adjusting a speed of a compressor to operate the compressor at a reduced speed in response to a user requested temperature, where the reduced speed is less than a threshold speed;
- while operating the compressor at the reduced speed, generating an estimate of a super heating temperature of a refrigerant according to a pressure at an inlet side of the compressor and a temperature at the inlet side of the compressor;
- holding the speed of the compressor at the reduced speed in response to the super heating temperature of the refrigerant being greater than a super heating threshold temperature;
- and then
- deactivating the compressor in response to the compressor being at the reduced speed and the estimate of the super heating temperature of the refrigerant exceeding the super heating threshold temperature for greater than a predetermined period of time.
2 more elements
Dependencies are inferred from the claim text.