Engine Cooling Fan Speed Control Algorithm
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Solution Overview
Problem
Existing cooling systems for engines suffer from inefficiencies, high emissions, short life, and excessive noise due to disproportionate engine power usage and inadequate temperature control.
Innovation Solution
A control system utilizing an algorithm to manage fan speed in cooling systems, maintaining a cooling medium at a set temperature and building a cooling safety margin based on engine output torque, thereby optimizing energy usage and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fan speed is increased to improve cooling efficiency, then cooling performance is improved, but engine power loss increases and noise increases
Solution Approach 1:
The fan drive system transitions from a static fixed-speed design to a dynamic variable-speed system using a controller that adjusts fan speed based on real-time cooling demand signals from the engine control unit, optimizing the balance between cooling performance and power consumption
Solution Approach 2:
The system changes the operational parameter of fan speed dynamically by receiving cooling demand signals and adjusting the fan drive motor speed accordingly, allowing the fan to operate at optimal speeds rather than fixed high speeds, thereby reducing power loss while maintaining adequate cooling
2Temperature
If fan speed is increased to improve cooling efficiency, then cooling performance is improved, but emissions increase
Solution Approach 1:
By dynamically adjusting fan speed based on actual cooling demand rather than operating at constant high speed, the system reduces unnecessary energy consumption and corresponding emissions while maintaining adequate cooling performance when needed
3Temperature
If fan speed is increased to improve cooling efficiency, then cooling performance is improved, but noise increases
Solution Approach 1:
The system implements dynamic speed adjustment where the fan operates at variable speeds based on cooling demand, avoiding continuous high-speed operation that generates excessive noise, thereby reducing noise pollution while maintaining cooling effectiveness
4Productivity
If conventional cooling control is used, then system simplicity is maintained, but cooling efficiency is low and system life is short
Solution Approach 1:
The controller leverages the existing engine control unit's multi-functional capability to also handle fan speed control, integrating cooling management into the universal ECU rather than requiring a completely separate dedicated control system
Solution Approach 2:
The system implements feedback control where the ECU receives cooling demand signals from temperature sensors and other parameters, processes this information, and adjusts fan speed accordingly, creating a closed-loop control system that improves cooling efficiency through intelligent regulation
Data Source
AI summary
A control system that uses an algorithm to control the fan speed in a cooling system for an engine is disclosed. The algorithm is adapted to maintain a cooling medium at a set temperature instead of an operating temperature range of the cooling medium. The algorithm is also adapted to maintain a cooling medium at a set temperature and to build a cooling safety margin in response to an engine output torque percentage that is below an output torque percentage setpoint.