Granted Patent B2

US 10,532,632 · App. 15/635,779 · Granted Jan 14, 2020

Abstract

Claims (28)

1. A refrigeration system, comprising:

a startup mode control module that

receives (i) an off time of a compressor of the refrigeration system and (ii) an indication of an ambient temperature during the off time,

determines whether the off time of the compressor and the indication of the ambient temperature indicate that the compressor is in a high ambient temperature startup condition based on an amount of time that the ambient temperature is greater than a temperature threshold within the off time, and

selects, based on the determination, between a normal startup mode and a high ambient temperature startup mode; and

a compressor control module that

operates the compressor in the normal startup mode in response to the startup mode control module selecting the normal startup mode,

operates the compressor in the high ambient temperature startup mode in response to the startup mode control module selecting the high ambient temperature startup mode, and

transitions from the high ambient temperature startup mode to the normal startup mode after a predetermined period associated with operating in the high ambient temperature startup mode.

2. The refrigeration system of claim 1 , wherein the compressor control module operates the compressor at a first speed in the normal startup mode and operates the compressor at a second speed less than the first speed in the high ambient temperature startup mode.

3. The refrigeration system of claim 2 ,

wherein the compressor control module determines a temperature of an electronic drive of the compressor and, in the high ambient temperature startup mode, varies the second speed according to the temperature of the electronic drive of the compressor.

4. The refrigeration system of claim 1 , wherein the startup mode control module selects the high ambient temperature startup mode when the off time is greater than an off time threshold and the ambient temperature is greater than the temperature threshold for at least a predetermined period within the off time.

5. The refrigeration system of claim 1 , wherein the startup mode control module selects the high ambient temperature startup mode further based on a comparison between the compressor off time and an off time threshold, and wherein at least one of the temperature threshold and the off time threshold is variable.

6. A vehicle comprising the refrigeration system of claim 1 .

7. A method of operating a refrigeration system, the method comprising:

using a startup mode control module,

receiving (i) an off time of a compressor of the refrigeration system and (ii) an indication of an ambient temperature during the off time,

determining whether the off time of the compressor and the indication of the ambient temperature indicate that the compressor is in a high ambient temperature startup condition based on an amount of time that the ambient temperature is greater than a temperature threshold within the off time, and

selecting, based on the determination, between a normal startup mode and a high ambient temperature startup mode; and

using a compressor control module,

operating the compressor in the normal startup mode in response to selecting the normal startup mode,

operating the compressor in the high ambient temperature startup mode in response to selecting the high ambient temperature startup mode, and

transitioning from the high ambient temperature startup mode to the normal startup mode after a predetermined period associated with operating in the high ambient temperature startup mode.

8. The method of claim 7 , further comprising operating the compressor at a first speed in the normal startup mode and operating the compressor at a second speed less than the first speed in the high ambient temperature startup mode.

9. The method of claim 8 , further comprising controlling the second speed according to a temperature associated with a drive of the compressor.

10. The method of claim 7 , further comprising selecting the high ambient temperature startup mode when the off time is greater than an off time threshold and the ambient temperature is greater than the temperature threshold for at least a predetermined period within the off time.

11. The method of claim 7 , further comprising selecting the high ambient temperature startup mode further based on a comparison between the compressor off time and an off time threshold, and wherein at least one of the temperature threshold and the off time threshold is variable.

Assignments (6)