Modular HVAC System for Engine-On and Off Operation
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Solution Overview
Problem
Modern trucks require auxiliary HVAC systems that can operate both during engine-on and engine-off modes, but existing solutions often necessitate the disposal of the engine-on system, lacking a modular and efficient way to transition between these modes.
Innovation Solution
A modular HVAC system comprising an engine-on module for operation during engine-on mode and an engine-off module, which can be connected to the engine-on module, featuring separate evaporators and a compressor powered by an electric source for operation during engine-off mode, allowing for seamless transition and installation without replacing existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an auxiliary HVAC system is installed to operate during engine-off mode, then cooling capability during engine-off mode is improved, but the existing engine-on HVAC system must be disposed of
Solution Approach 1:
The patent combines the engine-on HVAC system and engine-off HVAC system into a single integrated modular unit. The engine-on module containing the evaporator and blower motor is merged with the engine-off module containing the compressor and condenser, allowing both systems to coexist and operate seamlessly in their respective modes without requiring disposal of either component.
Solution Approach 2:
The integrated modular HVAC system performs multiple functions: it provides cooling during engine-on mode using the engine-on module, and provides cooling during engine-off mode using the engine-off module. The system universally handles both operational states of the vehicle engine, eliminating the need for separate systems or disposal of existing equipment.
2Adaptability or versatility
If a separate engine-off HVAC system is installed, then cooling during engine-off mode is achieved, but installation complexity increases
Solution Approach 1:
By merging both HVAC systems into a single integrated modular unit with shared housing and connected refrigerant lines, the patent reduces installation complexity compared to installing separate systems. The pre-assembled modular design allows for simplified installation while maintaining dual-mode operation capability.
3Volume of moving object
If the engine-off module is integrated with the engine-on module, then space utilization is improved, but the structure becomes more complex
Solution Approach 1:
The patent implements a nested structure where the engine-on module and engine-off module are housed within a shared outer housing. The evaporator from the engine-on module is positioned within the housing, and the engine-off module components (compressor, condenser) are arranged in the same housing space, creating a compact nested arrangement that optimizes space utilization while managing structural complexity through modular organization.
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
Enables efficient and flexible HVAC operation in both engine-on and engine-off modes without the need for system disposal, providing continuous cabin conditioning with reduced installation complexity and increased customer flexibility.
Implementation Method 1
an evaporator fluidly downstream of the fan assembly and configured to operate during engine-off mode
Implementation Method 2
the engine-on evaporator and the engine-off evaporator are disposed within an evaporator housing
Implementation Method 3
the engine-off module includes an engine-off outer housing, a condenser, and a compressor to be powered by an electric power source during engine-off mode
Implementation Method 4
the engine-off module includes an engine-off outer housing, a condenser, and a compressor
Implementation Method 5
a condenser and a compressor configured to be powered by an electric power source during engine-off mode
Data Source
AI summary
An auxiliary HVAC system includes an engine-on module configured to provide cooling or heating during an engine-on mode and an engine-off module connected to the engine-on module and configured to provide cooling or heating during an engine-off mode.