Startup control systems and methods for high ambient conditions
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Solution Overview
Problem
Refrigeration systems in vehicles face challenges when starting up after exposure to high ambient temperatures, as this can lead to increased demand for maximum capacity and potential damage to electronics due to elevated temperatures, causing operational impediments and fault conditions.
Innovation Solution
Implementing high ambient temperature startup logic that determines if the system has been exposed to hot soak conditions, adjusting compressor operation by selecting between normal and high ambient temperature startup modes, and operating the compressor at reduced speed for a predetermined period to reduce load until sufficient cooling is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates at maximum capacity upon startup after high ambient temperature exposure, then the refrigeration demand is met, but the risk of electronic damage and operational failure increases
Solution Approach 1:
The system performs preliminary cooling action before full capacity operation by activating the compressor at reduced speed for a predetermined period after detecting high ambient temperature conditions. This preliminary action reduces the temperature of electronic components and refrigerant before the system transitions to maximum capacity operation, thereby preventing electronic damage while still meeting refrigeration demands.
2Reliability
If the compressor operates at reduced speed during high ambient temperature startup, then the load on the compressor and drive is reduced, but the refrigeration capacity is decreased
Solution Approach 1:
The system implements periodic operation by running the compressor at reduced speed for a predetermined time period after startup, then transitioning to normal full-capacity operation. This periodic approach allows the system to balance reliability concerns during the initial period with productivity requirements during the subsequent normal operation period.
3Productivity
If the system immediately transitions to normal startup mode after high ambient temperature startup, then the refrigeration demand is met quickly, but the electronic components may be damaged due to elevated temperatures
Solution Approach 1:
The control module performs preliminary cooling action by maintaining reduced compressor speed for a predetermined period before allowing transition to normal startup mode. This preliminary action ensures that electronic components have sufficient time to cool down from elevated temperatures, preventing damage while still enabling relatively quick response to refrigeration demands.
Data Source
AI summary
A refrigeration system includes a startup mode control module that receives at least one parameter associated with operation of a compressor of the refrigeration system, determines whether the at least one parameter indicates that the compressor is in a high ambient temperature startup condition, and selects, based on the determination, between a normal startup mode and a high ambient temperature startup mode. A compressor control module 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.