Vehicle Air-Intake Door Control for Mixed Recirculation Heating
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Solution Overview
Problem
Current vehicle air conditioning systems lack the ability to regulate the ratio of internal and external air intake, leading to issues such as fluctuating wind speeds, slow cabin temperature increase during heating, and increased power consumption in new-energy vehicles.
Innovation Solution
An air conditioning system with a stepping motor and operating dial that controls the rotation of internal and external ventilation doors to set specific air intake ratios, allowing for precise adjustment of internal and external air intake volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the external circulation is set to 100% fully opening state for rapid acceleration, then the air intake volume is maximized, but the wind speed at the air-outtake opening fluctuates and comfort deteriorates
Solution Approach 1:
The patent divides the single ventilation door into two independent ventilation doors (internal circulation door and external circulation door), each controlled separately. This allows the external circulation door to be partially opened rather than fully opened, stabilizing wind speed while still providing adequate air intake during rapid acceleration.
Solution Approach 2:
The patent implements dynamic control of the two ventilation doors through independent actuators, allowing the system to adjust the opening degree of each door based on real-time operating conditions. This dynamic adjustment enables optimization of both air intake volume and wind speed stability during rapid acceleration.
2Reliability
If the air intake system is set to external circulation for heating in winter, then fogging is prevented, but the cabin temperature increases slowly affecting comfort
Solution Approach 1:
The patent uses two separate ventilation doors to independently control internal and external circulation. During heating, the system can open the internal circulation door to allow warm air recirculation while keeping the external circulation door partially open for fresh air intake, achieving both fogging prevention and faster cabin heating.
Solution Approach 2:
The patent changes the air circulation parameters by allowing simultaneous operation of internal and external circulation modes through independent door control. This enables the system to mix warm recirculated air with cooler fresh air, increasing the overall heating efficiency and cabin temperature rise rate while maintaining fogging prevention.
3Speed
If the high-pressure air heater PTC runs at 100% full power for external circulation heating, then the temperature increases rapidly, but power consumption increases affecting endurance mileage
Solution Approach 1:
The patent segments the heating function into two pathways: internal circulation for rapid heating using recirculated air, and external circulation for fresh air intake. This allows the PTC heater to operate at lower power by heating recirculated air, while still achieving effective cabin heating and preventing fogging through controlled external air intake.
Solution Approach 2:
The patent changes the heating system operation mode by enabling mixed internal-external circulation. This allows the PTC heater to operate more efficiently by heating a smaller volume of recirculated air rather than large volumes of cold external air, reducing power consumption while maintaining effective heating performance.
4Device complexity
If the internal and external circulation ventilation doors use a simple switching structure, then the device complexity is low, but the ability to regulate air intake ratio is lost
Solution Approach 1:
The patent segments the ventilation control into two independent doors with separate actuators, each capable of independent opening degree adjustment. This segmented structure provides precise air intake ratio regulation while keeping each individual door structure relatively simple.
Solution Approach 2:
The patent makes the ventilation system multi-functional by enabling it to operate in multiple modes: pure internal circulation, pure external circulation, and various mixed circulation ratios. The two-door design with independent control achieves this versatility without requiring complex mechanical linkages, as each door can be controlled independently by its own actuator.
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 comfort and fuel efficiency by stabilizing wind speeds, reducing power consumption, and enhancing heating performance in various vehicle conditions.
Implementation Method 1
a stepping motor, an operating dial, an internal-circulation ventilation door and an external-circulation ventilation door, the stepping motor is fixedly connected to the operating dial
Data Source
AI summary
The present application discloses an air conditioning system for a vehicle and an operating method therefor. The system includes a motor, an operating dial and internal and external-circulation ventilation doors, and the motor drives the operating dial to drive the internal and external-circulation ventilation doors to rotate to achieve the purpose of different internal and external air-intake ratios. The operating method includes: receiving a pulse signal having a preset direction of rotation and a preset step count of rotation of the motor; and driving the motor to rotate in the preset direction by the preset step count, to drive the operating dial to rotate, to cause the internal-circulation ventilation door to rotate to a first preset angle, and cause the external-circulation ventilation door to rotate to a second preset angle.