Hybrid Control Device for Battery Cooling and Drive Power
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Solution Overview
Problem
Hybrid vehicles face limitations in achieving sufficient drive power performance during 'sporty' driving conditions due to cooling fan noise constraints, which restrict the charge/discharge of secondary batteries, leading to inadequate acceleration.
Innovation Solution
A hybrid control device that allows selection of a power mode for the cooling fan, increasing air volume flow and charge/discharge limiting values based on operator preference, enabling enhanced drive power performance without excessive noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling fan air volume flow is increased to cool the secondary battery effectively, then the battery temperature is reduced and charge/discharge performance is improved, but the vehicle interior noise level increases
Solution Approach 1:
The cooling fan operates in multiple modes (ordinary mode and power mode) that can be dynamically switched based on driving conditions and operator preferences. The system transitions from static cooling control to dynamic control that adapts to varying operational requirements, allowing optimal balance between cooling performance and noise levels at different times.
Solution Approach 2:
The system changes the operating parameters of the cooling fan by switching between different air volume flow characteristics. In power mode, the fan provides higher air volume flow for improved cooling, while in ordinary mode, it operates at lower air volume flow for reduced noise. This parameter switching allows the system to adapt to different operational priorities.
2Power
If the charge/discharge current of secondary battery is increased to improve vehicle propulsion power, then the drive power performance is improved, but the temperature of secondary battery rises excessively
Solution Approach 1:
The system performs preliminary cooling action by operating the cooling fan in power mode before high-power charge/discharge operations. This pre-cooling prepares the battery for high-current operations by reducing its temperature in advance, allowing the battery to withstand higher charge/discharge currents without excessive temperature rise during subsequent propulsion events.
3Object-affected harmful factors
If the cooling fan air volume flow is suppressed low to reduce vehicle interior noise, then the noise level is reduced, but the amount of charge/discharge of secondary battery is limited and acceleration performance is insufficient
Solution Approach 1:
The system dynamically switches between ordinary mode and power mode based on driving conditions and operator preferences. During normal driving, the fan operates in ordinary mode for low noise. When sporty driving or mountain road conditions are detected, or when the operator selects power mode, the system transitions to power mode with higher air volume flow to enable sufficient acceleration performance.
Solution Approach 2:
The system allows the operator to manually select power mode when sporty driving is desired, making the system responsive to user needs. The control device detects operator intent and automatically adjusts cooling fan operation accordingly, providing self-service adaptation to varying performance requirements without requiring manual intervention in cooling control.
4Power
If the limiting value of charge/discharge amount is increased to improve drive power performance, then the usable range of secondary battery is expanded, but the cooling requirement increases and noise level rises
Solution Approach 1:
The system changes the charge/discharge limiting values based on the operating mode. In power mode, higher limiting values are permitted to enable improved drive power performance. In ordinary mode, lower limiting values are applied to maintain reduced noise levels. This parameter adaptation allows the system to optimize the balance between performance and noise based on current operational context.
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 allows for increased drive power performance by varying the cooling fan's air volume flow and charge/discharge limits, ensuring sufficient acceleration without compromising noise levels.
Implementation Method 1
a cooling fan for cooling the secondary battery
Implementation Method 2
Since such a secondary battery has an internal resistance, charge/discharge involves heat generation
Data Source
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AI summary
In a hybrid control device performing cooling control of a secondary battery of a hybrid vehicle, the hybrid control device limiting the amount of charge/discharge of the secondary battery based on an air volume flow of a cooling fan cooling the secondary battery, an operation control mode of the secondary battery cooling fan is changed from an ordinary control mode to a power mode in which an air volume flow of the cooling fan is larger than in the ordinary control mode, whereby a limiting value of the amount of charge/discharge of the secondary battery is varied to expand the usable range of the secondary battery. Accordingly, when improvement of drive power performance is desired by an operator more than low noise within the vehicle, the amount of charge/discharge of the secondary battery is not limited by the cooling fan, and larger drive power performance is thus achieved.