Hybrid Vehicle Battery Cooling Control via Charging Request
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Solution Overview
Problem
In hybrid vehicles, the battery temperature increases during high-output operations, particularly when only the rotary electric machine is used, leading to potential overheating and reduced performance.
Innovation Solution
A control system that adjusts the operation of a cooling fan based on charged-discharged electric power, user requests, and predicted vehicle usage, ensuring the battery is cooled more during conditions that may lead to high-output operations, such as charging requests or anticipated EV mode travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery is charged to increase power storage amount, then the power storage amount is improved, but the battery temperature increases
Solution Approach 1:
The cooling fan is operated in advance during battery charging to cool the battery before high-output operations occur. This preliminary cooling action prevents temperature increase during subsequent EV mode travel, resolving the contradiction between charging the battery and preventing overheating.
Solution Approach 2:
The cooling fan operation is dynamically adjusted based on the charging state and predicted travel mode. The controller increases cooling fan operation when charging is detected and EV mode is predicted, optimizing cooling capacity to match the thermal load conditions.
2Temperature
If the cooling fan is operated to cool the battery, then the battery temperature is reduced, but energy consumption increases
Solution Approach 1:
The cooling fan is operated selectively in advance during charging periods when thermal load is expected to occur later. This timing strategy provides necessary cooling only when high-output operations are predicted, avoiding continuous operation and reducing overall energy consumption.
Solution Approach 2:
The cooling fan operation is dynamically controlled based on real-time conditions including charging state, battery temperature, and predicted travel mode. The controller adjusts cooling fan speed and operation timing to provide optimal cooling with minimal energy consumption.
3Power
If high output operation of rotary electric machine is performed, then driving performance is improved, but battery temperature increases
Solution Approach 1:
The system detects charging requests and predicts EV mode travel in advance, then operates the cooling fan during these periods to cool the battery before high-output operations. This preliminary cooling ensures the battery can handle subsequent high-power demands without excessive temperature increase.
Solution Approach 2:
The controller continuously monitors battery temperature, charging state, and travel mode predictions to adjust cooling fan operation. This feedback mechanism ensures cooling is provided precisely when needed to maintain battery temperature within safe limits during high-output operations.
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
Effectively suppresses battery temperature increases, preventing overheating and maintaining performance by enhancing cooling capacity and preparing for high-output operations.
Implementation Method 1
a cooling fan for cooling the battery
Data Source
AI summary
A control system for a hybrid vehicle includes an internal combustion engine, a rotary electric machine, a battery, a cooling fan configured to cool the battery, and a controller. The controller is configured to determine an operation of the cooling fan based on charged-discharged electric power of the battery and presence or absence of a charging request that is based on an intention of a user. The controller is configured to control the operation of the cooling fan such that the battery is cooled more in a case where the charging request is present than in a case where the charging request is absent with the same charged-discharged electric power.