Vehicle Thermal Conditioning Bypass Control for Temperature Stability
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Solution Overview
Problem
Conventional thermal conditioning devices for motor vehicles experience cyclical temperature variations around the setpoint temperature, leading to reduced user comfort and increased energy consumption due to the cyclical operation of the compressor.
Innovation Solution
A method and device that control the position of a bypass means in a refrigerant circuit to adjust the air flow, allowing the compressor to operate in alternating states of high and low displacement, with the bypass position controlled based on the outlet temperature to maintain a consistent setpoint temperature, reducing energy consumption while minimizing temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compressor operates in a cyclical manner with high displacement to reduce energy consumption, then energy consumption is reduced, but temperature fluctuations around the setpoint increase
Solution Approach 1:
The bypass means is made dynamically controllable with multiple positions, allowing the system to adjust the bypass ratio in real-time according to the compressor's operational state. This dynamic adjustment enables the system to maintain stable temperature output even when the compressor operates cyclically at high displacement, resolving the contradiction between energy efficiency and temperature stability.
Solution Approach 2:
The system changes the operational parameters by controlling the bypass means to operate in a cyclical pattern that synchronizes with the compressor's cycles. By adjusting the bypass ratio parameter in coordination with compressor displacement changes, the system compensates for temperature variations and maintains setpoint temperature while achieving energy savings through high-displacement-only compressor operation.
2Power
If the compressor operates cyclically with high displacement only, then the compressor output is improved, but the temperature stability deteriorates
Solution Approach 1:
The bypass means acts as an intermediary element that mediates between the compressor's high-displacement cyclic operation and the requirement for stable temperature output. By introducing this intermediate control mechanism, the system can maintain improved compressor output while preventing temperature instability from affecting the final conditioned air delivery.
3Temperature
If the bypass means is controlled to maintain setpoint temperature, then temperature stability is improved, but the device complexity increases
Solution Approach 1:
The bypass means is designed with multi-functionality, serving both as a flow diversion mechanism and as a temperature control actuator. By integrating these functions into a single component with multiple positions, the system achieves improved temperature stability without proportionally increasing device complexity, as the same mechanical structure performs multiple control functions.
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 solution maintains thermal comfort for the user by reducing temperature variations to less than 1°C around the setpoint temperature while achieving energy savings of up to 20% by optimizing the compressor's cyclical operation.
Implementation Method 1
a heat exchanger (2) forming an evaporator, the heat exchanger having the ability to exchange heat with a flow of air intended to be discharged into the interior of the vehicle
Implementation Method 2
a refrigerant circuit comprising a compressor (C) and a heat exchanger (2) forming an evaporator
Implementation Method 3
at least one bypass means having the ability to divert from the heat exchanger at least part of said flow of air
Data Source
AI summary
A method for operating a device for the thermal conditioning of a motor vehicle interior, including: a refrigerant circuit including a compressor and a heat exchanger able to form an evaporator, the heat exchanger being able to exchange heat with a flow of air intended to be conditioned, a bypass means able to divert from the heat exchanger at least part of said air flow and which can be controlled in terms of position between the closed position in which no flow is diverted from the heat exchanger and a multitude of open positions in which part of the flow is diverted from the heat exchanger according to the position of opening, a mixing zone for mixing the flow that has passed through the evaporator and the flow of air diverted by the bypass means.