Air Management Valve Modulates Intake for TRU Engine
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Solution Overview
Problem
The engine compartment in transport refrigeration units (TRUs) becomes hot, causing intake air to warm and potentially reducing engine power and fuel economy due to the operational temperatures of the components.
Innovation Solution
An air management valve (AMV) is used to modulate air intake from a first duct within the engine compartment and a second duct receiving atmospheric air, adjusting based on temperature thresholds to ensure the air entering the engine remains below a certain temperature, thereby optimizing engine performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air intake is taken from within the engine compartment, then the air intake system is simple and compact, but the intake air temperature increases reducing engine power and fuel economy
Solution Approach 1:
The air intake system is segmented into multiple sources: a first air intake duct for atmospheric air and a second air intake duct for engine compartment air. The AMV divides the air intake flow between these two sources based on temperature conditions, allowing the system to select the cooler air source while maintaining a compact structure.
Solution Approach 2:
The air management valve (AMV) dynamically adjusts the air intake configuration based on real-time temperature monitoring. When the engine compartment air temperature exceeds a threshold, the AMV redirects air intake to the atmospheric air duct, and when temperature is acceptable, it switches back to the simpler engine compartment intake mode.
2Temperature
If air management valve dynamically switches between ducts, then intake air temperature is optimized, but device complexity increases
Solution Approach 1:
The system incorporates temperature sensors that continuously monitor the engine compartment air temperature and provide feedback to the control unit. The control unit processes this feedback and automatically actuates the AMV to switch between air intake ducts, creating a closed-loop control system that optimizes intake air temperature without requiring complex manual intervention.
Solution Approach 2:
The air management system is designed to autonomously regulate itself through the AMV and control unit, which automatically respond to temperature conditions without external intervention. The system self-adjusts the air intake configuration based on pre-programmed temperature thresholds, eliminating the need for complex external control mechanisms.
3Temperature
If AMV is fully closed during modulation, then precise temperature control is achieved, but air flow stability decreases
Solution Approach 1:
The AMV operates in a dynamic manner, transitioning between fully closed, partially closed, and fully open positions based on temperature conditions. During modulation, the valve adjusts its opening degree continuously rather than switching abruptly, which maintains air flow stability while achieving precise temperature control through gradual transitions.
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 effectively lowers the temperature of air entering the engine, enhancing engine power and fuel economy by utilizing a combination of compartment and atmospheric air, while also providing alerts and noise mitigation features to prevent overheating and maintain optimal performance.
Implementation Method 1
the AMV is configured to modulate air into the engine from the first duct and the second duct, when a temperature of air within the AMV is above the first threshold and the temperature of air within the second duct is below the first threshold, to lower the temperature of air entering the engine to below the first threshold
Data Source
AI summary
Disclosed is a transport refrigeration unit (TRU) having: an engine configured to power a refrigeration system of the TRU, the engine including an air intake, the engine within an engine compartment of the TRU; an air management valve (AMV) fluidly coupled to the air intake; a first duct fluidly coupled to the AMV and including a first inlet within the engine compartment; and a second duct fluidly coupled to the AMV and including a second inlet that is exterior to the engine compartment and is configured to receive atmospheric air; wherein: the AMV is configured to modulate air into the engine from the first duct and the second duct, when a temperature of air within the AMV is above the first threshold and the temperature of air within the second duct is below the first threshold, to lower the temperature of air entering the engine to below the first threshold.