Battery Cooling Fan Motor Controller Backup Logic
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Solution Overview
Problem
The existing battery cooling control systems in environment-friendly vehicles face issues with controlling the cooling fan motor when CAN communication is abnormal, leading to overheating and increased manufacturing costs due to the need for separate components like relay controllers and expensive PCB-type rotation speed detection sensors.
Innovation Solution
The system integrates a backup controller within the cooling fan motor controller, using CAN communication to transmit control conditions from the BMS and providing backup power to ensure continuous operation of the cooling fan motor, eliminating the need for relays and rotation speed detection sensors, and includes an alarm for abnormality notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate relay controllers and PCB-type rotation speed detection sensors are used for cooling fan control, then the cooling control reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the relay controller, rotation speed detection sensor, and cooling fan motor controller into a single integrated control unit. This consolidation maintains cooling control reliability by preserving all necessary functions while reducing device complexity and eliminating multiple separate components and their interconnections.
Solution Approach 2:
The integrated control unit performs multiple functions simultaneously: it controls the cooling fan motor, detects rotation speed, and manages relay operations. This multi-functionality eliminates the need for separate specialized components while maintaining the reliability of each individual function.
2Manufacturing precision
If multiple separate control components are used, then the control precision is improved, but the manufacturing cost increases
Solution Approach 1:
By combining multiple control functions into a single integrated unit, the patent reduces the total number of components that need to be manufactured and assembled. This integration maintains control precision through dedicated control circuits while significantly reducing manufacturing costs by eliminating redundant components and assembly steps.
3Device complexity
If CAN communication is used for control, then the device complexity is reduced, but the reliability deteriorates when communication is abnormal
Solution Approach 1:
The integrated control unit incorporates backup control logic that activates when CAN communication fails. This beforehand cushioning ensures continuous cooling operation by switching to alternative control methods, maintaining reliability despite communication abnormalities while keeping the overall device complexity low through integration.
Solution Approach 2:
The control unit performs self-diagnosis and automatically switches between CAN communication mode and backup control mode without external intervention. This self-service capability maintains operational reliability during communication failures while keeping the system simple and integrated.
Data Source
AI summary
An apparatus and a method for controlling cooling of a battery of an environment-friendly vehicle which transmits only a control condition from a BMS to a motor controller for cooling is provided. In particular, a cooling fan motor controller and the battery management system (BMS) are connected through a controller area network (CAN) communication, and a backup controller to which a backup power is supplied operates the cooling fan motor controller, when CAN communication is abnormal, to instruct a control condition for a cooling fan motor controller. As such, a stable control for a cooling fan motor for cooling the battery is provided.