Reefer Power Connection Lockout to Prevent Drive-Off Damage
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Solution Overview
Problem
Refrigerated transport units can be accidentally towed away while still connected to a utility power source, potentially causing damage to the unit or the power source, as existing systems lack effective prevention mechanisms.
Innovation Solution
A drive off protection system that includes a controller monitoring the electrical power system of the refrigerated transport unit, generating an instruction to prevent movement when connected to a utility power source, and communicating this instruction to the tow vehicle and any attached units to prevent movement, using physical or wireless connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refrigerated transport unit is connected to a utility power source, then the transport climate control system can operate without consuming onboard power, but the unit can be accidentally towed away causing damage
Solution Approach 1:
The system applies preliminary anti-action by detecting the connected state to the utility power source in advance and generating a drive-off prevention instruction before towing can occur. The controller monitors the connection status and proactively sends instructions to the tow vehicle to prevent movement, thereby counteracting the potential harmful action of accidental towing before it happens.
Solution Approach 2:
The system implements feedback by continuously monitoring the electrical power system's connection status to the utility power source and using this information to control the drive-off prevention function. The controller receives feedback about the connected state and adjusts the system's behavior accordingly, sending prevention instructions when connected and allowing normal operation when disconnected.
2Reliability
If a drive off protection system is implemented, then the risk of damage from accidental towing is reduced, but the system complexity increases
Solution Approach 1:
The system achieves multi-functionality by using the existing electrical power system, which is already present in the refrigerated transport unit for power management, to also perform the drive-off detection function. The controller that manages power distribution is repurposed to monitor connection status and generate prevention instructions, eliminating the need for separate dedicated detection hardware and reducing overall system complexity.
Solution Approach 2:
The electrical power system performs self-service by using its own monitoring capabilities to detect its connection status to the utility power source. The system serves its dual purpose of power management and safety monitoring through its existing sensors and controllers, without requiring external assistance or additional complex subsystems.
Data Source
AI summary
A method for preventing drive off of a refrigerated transport unit includes detecting whether an electrical power system of the refrigerated transport unit is electrically connected to a utility power source, and performing an action when the electrical power system is electrically connected to the utility power source includes. A drive off protection system includes a refrigerated transport unit including an electrical power system and a controller that monitors the electrical power system. The controller configured to perform an action when the electrical power system is electrically connected to the refrigerated transport unit.