Cooling Fan Control Device for Altitude Adaptation
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Solution Overview
Problem
Existing cooling fan control systems are inadequate in environments with varying air densities, particularly at high altitudes, where the standard upper fan speed limit fails to provide sufficient cooling due to reduced air density, leading to insufficient cooling performance.
Innovation Solution
A cooling fan control device that dynamically adjusts the rotation speed of cooling fans based on detected air density, increasing the upper limit of target rotation speed when air density is low to maintain effective cooling without exceeding the power capacity of the alternator, and adjusting accordingly when air density is higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the upper fan speed limit is set according to standard specification, then the cooling fan can operate within the power capacity of the alternator, but the heat exchanger may not receive sufficient cooling capacity in environments with low air density such as high altitudes
Solution Approach 1:
The patent applies dynamics by making the upper fan speed limit variable rather than fixed. The control device dynamically adjusts the upper limit based on detected air density, allowing the fan speed to adapt to different environmental conditions. When air density is low (high altitude), the system increases the upper limit to maintain cooling performance, and when air density is high, it reduces the limit to match power availability.
Solution Approach 2:
The patent changes the parameter of fan speed limit based on air density detection. By detecting air density and adjusting the upper speed limit parameter accordingly, the system optimizes cooling performance for each environmental condition while ensuring the alternator's power capacity is not exceeded.
2Temperature
If the upper fan speed limit is increased to improve cooling at high altitudes, then cooling performance improves, but the power consumption may exceed the alternator's power capacity
Solution Approach 1:
The patent implements feedback by continuously detecting air density and using this information to adjust the upper fan speed limit. The control device receives feedback from the air density detection and responds by setting an appropriate speed limit that balances cooling performance with power consumption constraints.
Solution Approach 2:
The system changes the operational parameters (fan speed limit) based on environmental conditions. By adjusting the speed limit parameter according to air density, the system ensures optimal cooling while preventing power consumption from exceeding the alternator's capacity.
3Device complexity
If a fixed upper fan speed limit is used, then the control system is simple, but it cannot provide sufficient cooling in varying environmental conditions
Solution Approach 1:
The patent transitions from a static control system to a dynamic one by introducing air density detection and adaptive speed limit setting. This dynamic approach allows the system to respond to environmental changes while maintaining relatively simple implementation through predefined adjustment rules.
Solution Approach 2:
The control device serves multiple functions: it detects air density, determines appropriate speed limits based on detected conditions, and controls the cooling fan operation. This multi-functionality allows a single device to handle both standard and high-altitude environments effectively.
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
Ensures appropriate cooling of heat exchangers across different air density environments without the need for upsizing the alternator, maintaining effective cooling performance even at high altitudes by optimizing fan speed based on air density.
Implementation Method 1
the density detection means of the cooling fan control device is an air pressure sensor
Implementation Method 2
a cooling fan being driven by power supplied from a power supply source and cooling a heat exchanger
Data Source
AI summary
To provide such a cooling fan control device, a cooling device, and a cooling fan control method that can cool a heat exchanger appropriately according to an air density. A cooling fan control device controls a rotation speed of a cooling fan being driven by power supplied from an alternator and cooling the heat exchanger. The cooling fan control device comprises a density detection means detecting the air density. The cooling fan control device comprises a controller, where the smaller the air density detected by the density detection means is, the greater an upper limit of target rotation speed of the cooling fan is set, as long as power consumption of the cooling fan does not exceed a power capacity of a power supply source.