Load-Adaptive Generator Control for Refrigeration Fuel Savings
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Solution Overview
Problem
Existing transport refrigeration generator sets operate at a single constant speed, leading to inefficient fuel consumption and potential loss of perishable cargo due to out-of-fuel conditions, especially in varying ambient temperatures, as they fail to adjust power output according to changing load demands.
Innovation Solution
A multi-speed generator set with a controller that adjusts the speed of the prime mover and generator based on sensed load, switching between two frequencies and output voltages to match the refrigeration unit's demand, thereby optimizing fuel usage and maintaining consistent power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the generator set operates at a single constant speed to provide adequate electrical power during high demand, then the power supply reliability is improved, but the fuel consumption efficiency deteriorates during extended operations with varying load demands
Solution Approach 1:
The generator set transitions from static single-speed operation to dynamic multi-speed operation. The controller automatically adjusts the prime mover speed between a first speed and a second speed based on real-time load sensor feedback, enabling the system to adapt its rotational speed to match varying electrical power demands while maintaining reliability
Solution Approach 2:
The system changes the operating parameters of the generator set by switching between different speed settings. The controller monitors load conditions and adjusts the prime mover speed parameter accordingly, operating at a first speed during high demand and a second speed during low demand to optimize fuel consumption while ensuring adequate power supply
2Device complexity
If the generator set operates at a single constant speed regardless of load conditions, then the system complexity is reduced, but the adaptability to varying load demands deteriorates
Solution Approach 1:
A load sensor is integrated into the system to continuously monitor the electrical power demand. The sensor provides feedback signals to the controller, which automatically adjusts the prime mover speed in response to changing load conditions, enabling the system to adapt to varying demands without requiring complex manual intervention
Solution Approach 2:
The generator set is designed with multi-functionality to handle diverse operating conditions. By incorporating multiple speed settings and automatic control capabilities, the single generator set can universally adapt to both high-demand and low-demand scenarios, replacing the need for multiple fixed-speed configurations
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
The solution ensures efficient power delivery to the transport refrigeration system by adjusting generator speed and output frequency in response to load changes, reducing fuel consumption and preventing cargo loss by maintaining power supply during extended operations.
Implementation Method 1
a generator disposed in the housing... coupled to the generator to selectively drive the generator
Data Source
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AI summary
A generator set (50,60) for a transport refrigeration unit that is operable at a first frequency and a second frequency. The generator set includes a generator (85) and a prime mover (75) coupled to the generator (85). The prime mover selectively drives the generator in least at a first non-zero speed and a second non-zero speed. A sensor (135) is in electrical communication with the generator to sense a load of the generator and to deliver a signal indicative of the generator load. A controller (90) is in electrical communication with the generator, the prime mover, and the sensor, and receives the signal indicative of the generator load. The controller selectively operates the generator at one of the first speed and the second speed in response to the signal indicative of the generator load.