Vehicle Heat Pump Control for Battery and Cabin Heating
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Solution Overview
Problem
Current vehicle heat management systems face challenges in meeting the heat requirements of both the passenger compartment and the battery, with inadequate heat distribution and low heating efficiency, particularly when the heat pump system operates under low temperature or insufficient air return pressure conditions.
Innovation Solution
An integrated heat management system that includes a heat pump subsystem, a high-pressure cooling subsystem, a battery self-heating subsystem, an air heating subsystem, and a control subsystem, which implements air supplement and enthalpy increase on the compressor to enhance the heating capacity and energy utilization efficiency by controlling the flow rate of refrigerant and distributing heat properly between the passenger compartment and the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the heat pump system operates under low temperature or insufficient air return pressure conditions, then the heating capacity is reduced, but the energy utilization efficiency greatly decreases
Solution Approach 1:
The system performs air supplement and enthalpy increase on the compressor before the refrigerant enters, pre-conditioning the refrigerant to ensure adequate flow rate and pressure. This preliminary action prevents the compressor from operating under insufficient conditions, thereby maintaining both heating capacity and energy utilization efficiency
Solution Approach 2:
The system changes the parameters of the refrigerant by performing enthalpy increase through the control valve connected between the exhaust port and air return port. This parameter change ensures the refrigerant has sufficient enthalpy and flow rate to maintain efficient compressor operation and heating capacity under low temperature conditions
2Power
If the flow rate of refrigerant flowing into the compressor is insufficient, then the suction pressure is low and the compressor does less work, but the heating capacity of the heat pump system is reduced
Solution Approach 1:
The control valve acts as an intermediary component between the exhaust port and the air return port of the compressor. It mediates the refrigerant flow by performing air supplement and enthalpy increase, ensuring the refrigerant reaches the compressor with adequate flow rate and pressure, thereby maintaining both compressor work output and heating capacity
3Power
If heat distribution between the passenger compartment and the battery is not proper, then the heat requirements cannot be met, but the heating efficiency remains low
Solution Approach 1:
The system segments the heat distribution function by providing separate heating paths for the passenger compartment and the battery through different subsystems (heat pump subsystem and battery self-heating subsystem). This segmentation allows independent control and optimization of heat distribution to each component, ensuring heat requirements are met while maintaining high heating efficiency
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 system effectively meets the heat requirements of both the passenger compartment and the battery, improving heating capacity and energy utilization efficiency by ensuring proper heat distribution and increasing the flow rate of refrigerant through air supplement and enthalpy increase, thus overcoming the limitations of existing systems.
Implementation Method 1
a heat pump subsystem, configured to heat or cool a passenger compartment of a vehicle, and configured to exchange heat with a battery of the vehicle
Implementation Method 2
the control subsystem controls the control valve to be in communication with the exhaust port of the compressor and the air return port of the compressor, to implement air supplement and enthalpy increase
Implementation Method 3
a high-pressure cooling subsystem, configured to exchange heat with a high-pressure system of the vehicle and the heat pump subsystem
Implementation Method 4
a battery self-heating subsystem, configured to heat the battery through charging and discharging of the battery
Data Source
AI summary
An integrated heat management system includes: a heat pump subsystem, configured to exchange heat with a passenger compartment and a battery of a vehicle; a high-pressure cooling subsystem, configured to exchange heat with a high-pressure system of the vehicle and the heat pump subsystem; a battery self-heating subsystem, configured to heat the battery through charging and discharging; an air heating subsystem, configured to exchange heat with the passenger compartment; the heat pump subsystem including a compressor and a control valve, one end of the control valve being in communication with an exhaust port of the compressor, and an other end of the control valve being in communication with an air return port of the compressor directly or through a gas-liquid separator; and a control subsystem, configured to control the control valve to be in communication with the exhaust port and the air return port of the compressor.