Cooling Fan Reversal Control Based on Dust Barrier Clogging
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Solution Overview
Problem
Existing fan control systems for work machines inefficiently manage the rotation direction of cooling fans, leading to unnecessary energy waste and reduced durability due to frequent and uncontrolled reversals.
Innovation Solution
A fan control system that includes a clogging degree calculator to assess the dust barrier's clogging level based on fan drive behavior and temperature parameters, and a reverse rotation instructor to only reverse the fan's rotation when the clogging degree is high, thereby optimizing fan operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan rotation direction is reversed at predetermined intervals regardless of dust barrier clogging status, then cooling air can be recovered by removing dust from the dust barrier, but energy is wasted in unnecessary rotation direction switching and the mechanism durability decreases
Solution Approach 1:
The system monitors changes in fan rotation speed as an indicator of dust barrier clogging degree. When the rotation speed deviates from the command value by more than a threshold, it indicates the dust barrier is clogged and reverse rotation is needed. This parameter-based monitoring ensures reverse rotation only occurs when actually necessary, avoiding unnecessary energy consumption while maintaining cooling efficiency.
2Productivity
If the fan rotation direction is reversed at predetermined intervals regardless of dust barrier clogging status, then cooling air can be recovered by removing dust from the dust barrier, but the mechanism durability decreases due to frequent switching
Solution Approach 1:
The system uses rotation speed deviation as a trigger condition for reverse rotation. By monitoring whether the actual rotation speed differs from the commanded speed by more than a predetermined threshold, the system intelligently determines when dust barrier cleaning is necessary. This prevents unnecessary reverse rotation operations, thereby extending the durability of the rotation direction switching mechanism while maintaining effective dust removal when needed.
Solution Approach 2:
The control device continuously monitors the fan's rotation speed and compares it with the command value to determine the dust barrier clogging status. This feedback mechanism enables the system to make informed decisions about when to initiate reverse rotation, avoiding unnecessary operations that would reduce mechanism durability while ensuring cooling air recovery when the dust barrier is actually clogged.
3Productivity
If the fan rotation direction is reversed frequently, then dust can be blown off the dust barrier for removal, but the cooling fan does not drive efficiently due to unnecessary reversals
Solution Approach 1:
The system monitors rotation speed changes of the cooling fan to detect dust barrier clogging. When the rotation speed deviation exceeds a threshold, it triggers reverse rotation to remove dust. This ensures the fan operates efficiently by maintaining normal rotation direction during unclogged periods, only reversing when actually necessary to restore cooling efficiency.
Solution Approach 2:
The control device uses feedback from rotation speed monitoring to determine when dust barrier cleaning is needed. By continuously comparing actual rotation speed with command speed, the system only initiates reverse rotation when the dust barrier is sufficiently clogged to affect performance, thereby maintaining fan driving efficiency while achieving effective dust removal when necessary.
Data Source
AI summary
A fan control system includes a fan, a dust barrier near the fan, a fan actuator to rotate the fan in a normal direction and a reverse direction, a fan controller configured or programmed to control a manner in which the fan actuator is driven, a clogging degree calculator configured or programmed to calculate a clogging degree of the dust barrier based on drive behavior of the fan, and a reverse rotation instructor configured or programmed to instruct the fan controller based on the clogging degree to rotate the fan in the reverse direction.