Adjustment of compressor operating limits
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Solution Overview
Problem
Refrigerant systems often shut down when operating near or above safe limits, leading to inefficiencies and potential damage, especially during rapid cooldown or high ambient temperature conditions, resulting in issues like food spoilage or discomfort in conditioned spaces.
Innovation Solution
A control system that allows temporary alteration or elimination of safe operating limits for the compressor, enabling operation beyond predefined limits for short periods by sensing and adjusting parameters such as temperature and pressure, with optional automatic adjustments based on ambient conditions or system malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates above safe discharge temperature or pressure limits, then rapid cooldown and high-load operation can be achieved, but system component damage may occur
Solution Approach 1:
The patent implements dynamic adjustment of safe operating limits based on real-time system conditions. The control system temporarily modifies discharge temperature and pressure limits during rapid cooldown operations, allowing the compressor to operate above standard safe limits when necessary, while automatically restoring normal limits when conditions return to normal. This dynamic approach resolves the contradiction by enabling high productivity during critical periods without permanently compromising system reliability.
Solution Approach 2:
The invention changes the operating parameters (discharge temperature and pressure limits) based on system state. During rapid cooldown, the control system raises the allowable discharge temperature and pressure thresholds, permitting the compressor to operate in a previously restricted high-stress regime. This parameter modification enables the system to achieve rapid cooldown while managing the risks through controlled parameter adjustments rather than rigid limit enforcement.
2Reliability
If the refrigerant system shuts down when safe limits are exceeded, then compressor damage is prevented, but food spoilage and cargo loss occur
Solution Approach 1:
Rather than implementing a static shutdown threshold, the system dynamically adjusts the safe operating limits based on operational context. During rapid cooldown operations, the control system temporarily raises the discharge temperature and pressure thresholds, allowing the compressor to continue operating above standard safe limits without triggering a shutdown. This prevents interruptions that would lead to food spoilage and cargo loss, while still protecting the compressor through monitored temporary operation above limits.
Solution Approach 2:
The control system continuously monitors system conditions and automatically adjusts operating limits without requiring external intervention or manual override. When rapid cooldown conditions are detected, the system self-adjusts by raising safe operating thresholds and allowing continued compressor operation. This automated self-service approach maintains cooling continuity and prevents cargo loss while inherently protecting the compressor through intelligent limit management.
3Reliability
If strict safe operating limits are enforced, then system reliability is maintained, but operational flexibility and adaptability are reduced
Solution Approach 1:
The patent transforms rigid static safety limits into dynamic adaptive thresholds that respond to real-time system conditions. The control system adjusts discharge temperature and pressure limits based on operational mode, ambient temperature, and system state. This enables the system to adapt to varying conditions such as rapid cooldown requirements or high ambient temperature operations while maintaining reliability through context-aware limit enforcement rather than blanket restrictions.
Solution Approach 2:
The invention modifies safe operating parameters (temperature and pressure limits) based on system needs and environmental conditions. During normal operation, strict limits are enforced for safety. During rapid cooldown or high-ambient-temperature conditions, the system raises these parameters to allow flexible operation. This parameter adaptability resolves the contradiction by maintaining safety through intelligent parameter adjustment rather than fixed restrictive limits.
Data Source
Figure 1~2
AI summary
A refrigerant system includes a compressor that has safe operating limits that are also built into a refrigerant system control to protect the compressor. Under certain conditions, these safe operational limits may be changed to allow the compressor to operate beyond the safety limits at least for a period of time.