Active Air Flap Control for Hybrid Vehicle Thermal Drag Balance
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Solution Overview
Problem
Existing hybrid vehicles face inefficiencies in fuel consumption due to insufficient management of internal heat loads, which affect aerodynamic performance and stability.
Innovation Solution
A hybrid vehicle equipped with multiple active air flaps controlled by a controller that adjusts their opening and closing based on various temperature and pressure parameters, including coolant, inverter, oil, and refrigerant conditions, to optimize airflow and reduce drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the active air flap is opened to cool heat exchangers in the engine compartment, then the temperature of heat-generating components is reduced, but air resistance increases and fuel efficiency deteriorates
Solution Approach 1:
The air flap system is divided into multiple independent flaps (first air flap and second air flap) that can be controlled separately. This segmentation allows selective opening of specific flaps based on which heat exchanger needs cooling, enabling precise thermal management while minimizing overall air resistance and improving fuel efficiency.
Solution Approach 2:
The air flaps are designed to be dynamically adjustable rather than fixed. The controller actively manages the opening and closing of each flap based on real-time temperature data from multiple heat-generating components, allowing the system to adapt to varying thermal conditions and optimize the balance between cooling performance and aerodynamic efficiency.
2Temperature
If multiple air flaps are opened to manage heat from multiple heat-generating components, then cooling performance is improved, but air resistance and energy consumption increase
Solution Approach 1:
Different air flaps are assigned to cool specific heat-generating components (engine, inverter, battery, etc.) based on their local thermal requirements. The controller opens only the specific flap corresponding to the component that requires cooling, rather than opening all flaps simultaneously. This localized approach ensures adequate cooling performance while minimizing the total area open to air flow, thereby reducing air resistance and energy loss.
Solution Approach 2:
The system incorporates temperature sensors for multiple heat-generating components that provide feedback to the controller. Based on this feedback, the controller intelligently determines which air flap(s) need to be opened and adjusts their positions accordingly. This closed-loop control ensures that flaps are opened only when and where needed, optimizing the balance between cooling performance and energy 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
Improves fuel efficiency and aerodynamic performance by dynamically managing airflow according to heat sources within the engine compartment, enhancing vehicle stability and reducing energy consumption.
Implementation Method 1
when a vehicle is running at a high speed, a large amount of ambient air is introduced, increasing air resistance
Implementation Method 2
various heat exchangers such as a radiator, an intercooler, an evaporator, and a condenser are provided as well as parts for driving a hybrid vehicle such as an engine
Implementation Method 3
a heat-exchanging medium such as a refrigerant flows in the components to be heat-exchanged with ambient air of the heat exchangers
Data Source
AI summary
A hybrid vehicle includes active air flaps provided on a front-end module and a controller that controls the active air flaps based on a coolant temperature according to an outdoor air temperature, an inverter temperature of a drive motor according to an outdoor air temperature, an inverter temperature of an starter-generator according to an outdoor air temperature, a temperature of a low DC converter according to an outdoor air temperature, a transmission oil temperature according to an outdoor air temperature, or an engine oil temperature according to an outdoor air temperature, controls the active air flaps based on a refrigerant pressure according to an outdoor air temperature, controls the active air flaps based on an operation mode of a cooling fan, or controls the active air flaps based on an intake temperature according to an outdoor air temperature for each of driving modes of the vehicle.