Vehicle Battery Cooling Damper Control for Wind Roar Reduction
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Solution Overview
Problem
Existing motor vehicle cooling systems cause unusual noise, such as wind roar, during battery cooling operations, making passengers feel uncomfortable due to the lack of noise management.
Innovation Solution
A cooling system with multiple air blow modes and an air blow mode switchover module that restricts and releases air blow to the accumulator, controlled by a controller to minimize noise disruption, including a noise level detection module to adjust operations based on ambient noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air blow mode switchover module changes over the position of the damper to switch between air flow paths for cooling the accumulator, then the cooling system can effectively cool the accumulator, but unusual noise such as wind roar occurs during the switchover process
Solution Approach 1:
The controller restricts the air blow to the accumulator before the damper switchover occurs. By reducing the air flow rate in advance, the system prepares for the upcoming mode change in a way that minimizes noise generation during the transition, while still maintaining effective cooling after the switchover is complete.
Solution Approach 2:
The system implements periodic cycles of air blow restriction and release synchronized with the damper switchover operations. The controller alternates between restricting and releasing air blow in periodic phases, where restriction occurs before switchover and release occurs after switchover, creating a rhythmic control pattern that manages noise while maintaining cooling effectiveness.
2Productivity
If the blower fan operates at high speed to cool the accumulator quickly, then the cooling efficiency is improved, but the unusual noise becomes more prominent and causes passenger discomfort
Solution Approach 1:
The controller dynamically adjusts the air blow restriction level based on the real-time operational state of the blower fan and the phase of damper switchover. Rather than maintaining a fixed high or low air flow rate, the system continuously modulates the air blow characteristics to match the cooling demands while minimizing noise during critical switchover periods.
Solution Approach 2:
The system changes the air blow parameters (flow rate, pressure) in response to switchover demands. By adjusting these parameters dynamically - restricting air blow during switchover and releasing it afterward - the system maintains cooling productivity while controlling noise levels through parameter modulation rather than fixed operational settings.
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 effectively reduces unusual noise during air blow mode changes, enhancing passenger comfort by masking noise with ambient sounds and optimizing air flow to prevent discomfort.
Implementation Method 1
an air blower provided to have multiple air blow modes of taking in the air from different locations and blowing the intake air to the accumulator
Implementation Method 2
The air blow restriction changeover control sequentially controls the air blower to restrict the air blow to the accumulator, controls the air blow mode switchover module to switch over the active air blow mode after restriction of the air blow to the accumulator
Data Source
AI summary
The position of a damper is changed over to switch over the cooling mode between an inside air intake mode and an A/C intake mode. In the inside air intake mode, the air inside a passenger compartment of a motor vehicle is taken in and directly blown to a battery by the operation of a battery blower fan. In the A/C intake mode, the air cooled down by an air conditioner (evaporator) is taken in and blown to the battery by the operation of the battery blower fan. When the detected vehicle speed V is not lower than a preset reference speed Vref, the position of the damper is immediately changed over (steps S240 to S260). When the vehicle speed V is lower than the preset reference speed Vref, on the other hand, the operation amount of the battery blower fan is restricted to a preset limit level Qlim, prior to the changeover of the position of the damper (steps S220 to S260). Such control reduces the potential wind roar occurring in the course of the changeover of the position of the damper, thus effectively preventing the driver and the other passengers from feeling odd and uncomfortable.