Vehicle Air Conditioning Blower Control for Heating Efficiency
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Solution Overview
Problem
Conventional air-conditioning systems in vehicles inefficiently use heat sources for heating, leading to energy loss and reduced engine warming-up performance due to fixed operation of the air-conditioning blower at maximum voltage, without considering energy loss during heating.
Innovation Solution
A method for optimally controlling the air-conditioning blower by determining the heater heat quantity and lost heat quantity, calculating the effective heating energy, and adjusting the blower operation to maximize energy efficiency, involving a controller that uses vehicle state and air-conditioning information to calculate the optimum operation amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air-conditioning blower is operated at maximum voltage to supply maximum heat, then heating performance is improved, but energy loss increases and engine warming-up performance deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from fixed maximum voltage operation to variable voltage operation. The control unit dynamically adjusts the blower motor voltage based on real-time calculations of effective heating energy, which considers both heater heat quantity and lost heat quantity. This dynamic adjustment allows the system to optimize heating performance while minimizing energy loss and improving engine warming-up performance.
Solution Approach 2:
The patent changes the operating parameters of the blower motor from fixed maximum voltage to variable voltage levels. By calculating the effective heating energy based on heater heat quantity and lost heat quantity, the control unit determines the optimal voltage level that maximizes heating efficiency. This parameter change enables the system to operate at different voltage levels (e.g., 12V, 6V, 3V, 0V) depending on the thermal conditions and energy efficiency requirements.
2Productivity
If the air-conditioning blower is fixedly operated with maximum voltage, then maximum wind supply is achieved, but energy efficiency deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the thermal conditions and calculating the effective heating energy. The control unit uses detection signals from temperature sensors and other sensors to determine the heater heat quantity and lost heat quantity. Based on this feedback, the control unit adjusts the blower motor voltage to optimize energy efficiency while maintaining adequate wind supply for heating.
3Object-affected harmful factors
If ventilation mode is used to prevent window frost, then frost prevention is achieved, but interior air is discharged outside causing large energy loss
Solution Approach 1:
The patent changes the operational parameters of the air-conditioning system by adjusting blower voltage and operation duration based on the selected mode (defrost mode or heating mode). In defrost mode, the system provides maximum wind supply to prevent window frost. In heating mode, the system optimizes voltage to balance heating performance with energy efficiency, minimizing interior air discharge loss while maintaining adequate heating.
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 approach enhances heating performance and engine warming-up efficiency by minimizing heat energy loss and optimizing blower operation, thereby improving fuel efficiency and reducing energy consumption.
Implementation Method 1
determining a heater heat quantity after an engine of the vehicle is started under a maximum heating condition of the air-conditioning system and the air-conditioning system is turned on
Data Source
AI summary
An air-conditioning control method for calculating an optimum operation amount of an air-conditioning blower in an air-conditioning system of a vehicle includes: determining a heater heat quantity after an engine of the vehicle is started under a maximum heating condition of the air-conditioning system and the air-conditioning system is turned on according to current vehicle state information and air-conditioning information; determining a lost heat quantity discharged outside the vehicle during a current air-conditioning mode; determining an effective heating energy efficiency by calculating a difference between the heater heat quantity and the lost heat quantity; calculating the optimum operation amount of the air-conditioning blower where the effective heating energy is maximized; and controlling operation of the air-conditioning blower according to the determined optimum operation amount.