Vehicular heat pump cycle device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicular heat pump cycles face challenges in ensuring necessary heating capacity while suppressing compressor noise, particularly at low vehicle speeds or with low indoor blower air volume, where increasing compressor rotation speed is limited.
Innovation Solution
Incorporating a compressor, heating unit, decompression unit, and heat absorbing unit, with a decompression unit that increases heat absorption as allowable noise levels decrease, and an upper limit rotation speed determination unit to adjust compressor speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If compressor rotation speed is increased to ensure heating capacity, then heating capacity is improved, but compressor noise increases
Solution Approach 1:
The patent applies parameter changes by adjusting the compressor's rotation speed based on vehicle speed and noise constraints. At low vehicle speeds where noise is more noticeable, the compressor operates at lower rotation speeds to reduce noise, while at high vehicle speeds where noise is less noticeable, the compressor can operate at higher rotation speeds to provide sufficient heating capacity.
Solution Approach 2:
The patent implements dynamic operation by making the compressor's rotation speed variable rather than fixed. The rotation speed is dynamically adjusted based on real-time conditions including vehicle speed and heating requirements, allowing the system to optimize between noise reduction and heating capacity provision under different operating conditions.
2Object-generated harmful factors
If compressor rotation speed is decreased to reduce noise, then compressor noise is reduced, but heating capacity becomes insufficient
Solution Approach 1:
The patent compensates for reduced compressor heating capacity at low rotation speeds by utilizing waste heat from the exhaust gas. The exhaust heat exchanger transfers thermal energy from the exhaust gas to the intake air or cabin air, providing additional heating capacity that makes up for the reduced compressor contribution.
Solution Approach 2:
The patent converts the harmful exhaust gas, which would otherwise be wasted heat energy, into a useful heating source. The exhaust heat exchanger captures thermal energy from the exhaust gas and transfers it to the cabin air or intake air, transforming a potential environmental pollutant into a beneficial heating resource.
3Power
If waste heat recovery is increased to compensate for reduced compressor heating, then heating capacity is maintained, but system complexity increases
Solution Approach 1:
The exhaust heat exchanger serves multiple functions within the vehicle's thermal management system. It not only provides heating capacity compensation when the compressor operates at low speeds, but also preheats intake air for the engine, recovers waste heat for cabin heating, and can function as a thermal energy storage component. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The patent merges the waste heat recovery function with the existing exhaust system and heating system. Rather than adding a completely separate complex system, the exhaust heat exchanger is integrated into the existing thermal management architecture, combining multiple heating functions into a single coordinated system that shares common components and control mechanisms.
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 configuration allows for maintaining desired heating capacity while reducing compressor noise by increasing heat absorption in the heat absorbing unit, even when compressor rotation speed is decreased.
Implementation Method 1
a heating unit that heats an object to be heated using a refrigerant discharged from a compressor and heat generated by a heat generating unit as heat sources
Implementation Method 2
a heat absorbing unit that causes refrigerant, which has been decompressed by the decompression portion, to absorb heat generated by a heat generating unit
Implementation Method 3
a decompression unit that decompresses refrigerant flowing out of the heating unit
Data Source
AI summary
The configuration enables to suppress noise of a compressor while ensuring a necessary heating capacity. a compressor configured to draw, compress, and discharge refrigerant; a heating unit configured to heat an object to be heated using, as a heat source, refrigerant discharged from the compressor; a decompression unit configured to decompress refrigerant flowing out of the heating unit; and a heat absorbing unit configured to cause refrigerant, which is decompressed by the decompression unit, to absorb heat generated by a heat generating unit. The heat absorbing unit is configured to increase an amount of absorbed heat according to decrease in the allowable noise level of the compressor.