Load-Responsive Generator Speed Control for Refrigeration Units
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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 under varying load demands and extreme ambient temperatures.
Innovation Solution
A multi-speed generator set with a sensor and controller system that adjusts the speed based on load demands, switching between two non-zero speeds to optimize power supply and reduce fuel consumption.
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 load demand, then the power supply reliability is improved, but the fuel consumption increases and the generator may experience out-of-fuel conditions during extended operation
Solution Approach 1:
The generator set transitions from static single-speed operation to dynamic multi-speed operation. The controller dynamically adjusts the prime mover speed between a first speed and a second speed based on real-time load sensor feedback, allowing the system to adapt its energy consumption to actual power demands while maintaining reliability.
Solution Approach 2:
The system changes the operational parameter of prime mover speed from a fixed constant to a variable parameter. By switching between at least two different speed values based on load conditions, the generator optimizes fuel consumption while ensuring adequate power supply during both high and low load periods.
2Device complexity
If the generator set operates at a single constant speed regardless of load variations, then the control system simplicity is maintained, but the operational efficiency decreases during extended periods without inspection
Solution Approach 1:
A load sensor provides continuous feedback about the generator's electrical load to the controller. This feedback mechanism enables the controller to automatically adjust the prime mover speed in response to changing load conditions, improving operational efficiency without requiring complex manual intervention or frequent inspections.
Solution Approach 2:
The generator set becomes self-regulating through the automatic control system. The sensor and controller work together to monitor load conditions and autonomously adjust operating parameters, allowing the system to optimize its own performance without external intervention during extended operation periods.
3Power
If the generator set operates at high speed to meet peak power demands, then the power output capability is improved, but the fuel wastage increases during low load periods
Solution Approach 1:
The prime mover speed is made dynamic rather than static. The system can operate at a higher first speed when peak power is needed and transition to a lower second speed during low load periods, matching power output capability to actual demand and reducing energy loss during extended operation.
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 system ensures consistent power delivery to the transport refrigeration unit, reducing fuel wastage and protecting perishable cargo by dynamically adjusting speed in response to load changes, thereby enhancing operational efficiency and cargo preservation.
Implementation Method 1
A sensor is in electrical communication with the generator to sense a load of the generator and to deliver a signal indicative of the generator load
Implementation Method 2
a prime mover disposed in the housing and coupled to the generator to selectively drive the generator in at least a first non-zero speed and a second non-zero speed
Implementation Method 3
The generator set provides electrical power to the transport refrigeration unit... a generator disposed within the housing
Data Source
AI summary
A generator set for a transport refrigeration unit that is operable at a first frequency and a second frequency. The generator set includes a generator and a prime mover coupled to the generator. The prime mover selectively drives the generator in least at a first non-zero speed and a second non-zero speed. A sensor 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 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.