Container Refrigeration Engine Speed Control for Variable Load
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Solution Overview
Problem
Container refrigeration systems are inefficient due to the continuous high-speed operation of diesel generators, even when the refrigeration load is low, leading to excessive energy consumption.
Innovation Solution
Implementing an engine controller that adjusts the speed of the generator engine based on real-time refrigeration load information, using a power converter and inverter to optimize power generation and consumption, thereby preventing unnecessary fuel waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the generator engine operates at high speed continuously, then power supply reliability is improved, but energy consumption increases
Solution Approach 1:
The generator engine speed is made dynamically adjustable based on refrigeration load conditions. The engine controller varies the rotation speed according to actual power demand, transitioning from fixed high-speed operation to adaptive speed control, thereby reducing energy consumption while maintaining sufficient power supply reliability.
Solution Approach 2:
The rotation speed parameter of the generator engine is changed according to refrigeration load conditions. By adjusting the engine speed parameter to match the actual power demand, the system achieves optimal balance between power supply reliability and energy efficiency.
2Loss of energy
If the generator engine speed is reduced to save energy, then fuel consumption decreases, but power generation capacity is insufficient
Solution Approach 1:
The engine controller receives feedback signals from the refrigeration apparatus controller regarding the actual refrigeration load. Based on this feedback, the controller adjusts the generator engine speed to match the required power demand, ensuring sufficient power generation capacity while minimizing fuel consumption.
Solution Approach 2:
The system dynamically adjusts engine speed in response to changing refrigeration loads. When load increases, engine speed increases to provide more power; when load decreases, engine speed reduces to save fuel, maintaining the optimal balance between power capacity and energy loss.
3Use of energy by moving object
If the engine controller adjusts engine speed based on load information, then energy efficiency is improved, but system complexity increases
Solution Approach 1:
The engine controller is designed to perform multiple functions: it not only controls engine speed but also receives and processes load information from the refrigeration apparatus controller. This multi-functional design improves energy efficiency while minimizing the increase in system complexity by consolidating control functions.
Solution Approach 2:
The engine controller acts as an intermediary between the refrigeration apparatus controller and the generator engine. It receives load information signals from the refrigeration controller and translates them into appropriate engine speed commands, simplifying the overall control architecture while achieving improved energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances energy efficiency by matching power generation with the refrigeration load, reducing fuel consumption and improving the overall energy efficiency of the refrigeration system.
Implementation Method 1
a power generator (22) driven by the generator engine (21) to generate power
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A refrigeration apparatus controller (31) calculates a refrigeration load of a refrigeration apparatus (11), and a load signal (S) containing load information indicating a magnitude of the refrigeration load is output from a communication device (32) to an engine controller (25). The engine controller (25) controls a speed of rotation of a generator engine (21) based on the load signal (S).