Cooling blower control device and method for high-voltage battery
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Solution Overview
Problem
Conventional high-voltage battery cooling blower control methods in hybrid vehicles are inefficient due to inaccurate temperature sensing, leading to ineffective operation of the cooling blower, as they rely solely on temperature measurements and fail to dynamically handle heat emission from battery cells.
Innovation Solution
A cooling blower control device and method utilizing fuzzy control, which incorporates temperature and current sensors to determine a duty ratio for the cooling blower, enabling more dynamic and effective control through a fuzzy reasoning process and PWM control, rather than relying solely on temperature values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PWM control based solely on temperature sensing is used, then the control structure is simple, but the cooling effectiveness is insufficient due to inaccurate temperature measurement and inability to dynamically handle heat emission
Solution Approach 1:
The patent combines temperature sensing and current sensing into a unified control system that processes both signals through fuzzy logic. The temperature sensor detects BPA temperature while the current sensor detects output current, and both inputs are merged in the fuzzy controller to determine the cooling blower's duty ratio, creating a comprehensive cooling control strategy that addresses both thermal state and heat generation rate
Solution Approach 2:
The patent changes the control parameters from purely temperature-based to a dual-parameter system incorporating both temperature and current. The fuzzy controller uses temperature (T) and current (I) as inputs and generates duty ratio as output, transforming the control approach from simple threshold-based PWM to adaptive fuzzy logic control that dynamically adjusts cooling based on multiple parameters
2Measurement precision
If only temperature sensors are used for control, then the device complexity is low, but the measurement precision of heat emission is insufficient
Solution Approach 1:
The patent introduces current sensing as an intermediary measurement that indirectly reflects heat emission from battery cells. Since direct heat emission measurement is difficult, the current sensor serves as a mediator to detect the rate of heat generation based on output current, which correlates with thermal production in high-rate discharging conditions
Solution Approach 2:
The control system achieves multi-functionality by using the same fuzzy controller and PWM output structure to process both temperature and current inputs. The existing temperature control framework is extended to handle current-based heat emission detection, making the system versatile without requiring completely new control architecture
3Adaptability or versatility
If the cooling blower operates based on fixed temperature thresholds, then the control logic is simple, but the adaptability to dynamic heat emission conditions is poor
Solution Approach 1:
The patent transforms the static, threshold-based control logic into a dynamic system using fuzzy logic control. Instead of fixed temperature thresholds that trigger on/off decisions, the fuzzy controller continuously processes varying temperature and current inputs to generate adaptive duty ratio outputs, enabling the cooling blower to respond dynamically to changing thermal conditions and heat emission rates
Solution Approach 2:
The system implements feedback control by continuously monitoring both temperature and current, processing these inputs through the fuzzy controller, and adjusting the cooling blower's duty ratio accordingly. The PWM controller delivers feedback-based pulsed signals to the cooling blower, creating a closed-loop system that adapts to real-time thermal conditions
Data Source
AI summary
Disclosed is a cooling blower control device and method for a high-voltage battery, by which a cooling blower used in a high-voltage battery is efficiently controlled using fuzzy control. To this end, the cooling blower control device includes a temperature (or first) sensor configured to sense an internal temperature of a battery pack assembly, and a current sensor configured to sense an output current of the battery pack assembly. A fuzzy controller performs fuzzy control by using outputs of the temperature sensor and the current sensor as inputs to output a cooling blower's duty ratio, and a pulse-width modulation (PWM) controller performs PWM control by using an output of the fuzzy controller as an input to output a control signal for driving the cooling blower.