Work Machine Cooling Fan Speed Control via Engine Output
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Solution Overview
Problem
Existing hydraulically driven cooling fans for work machines adjust rotational speed based on engine temperature and rotational speed, but not in relation to engine output, leading to inefficient fuel consumption and noise levels.
Innovation Solution
A work machine with a thermostat, fan device, output changeover switch, and rotational speed setting units that adjust fan speed according to engine output mode, reducing fan speed when engine output is low and increasing it when engine output is high within specific temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotational speed is increased to improve cooling performance, then the cooling efficiency is improved, but the fuel consumption and noise increase
Solution Approach 1:
The fan rotational speed is made dynamically adjustable based on engine output mode. The control unit receives signals from the engine output mode detection unit and adjusts the fan speed accordingly - higher speed when engine output is high, lower speed when engine output is low. This dynamic adjustment optimizes the balance between cooling performance and fuel consumption.
Solution Approach 2:
The system changes the operational parameters of the fan based on detected conditions. Specifically, the rotational speed parameter is modified according to the engine output mode, allowing the fan to operate at optimal speeds for different loading conditions, thereby reducing unnecessary energy consumption while maintaining adequate cooling.
2Temperature
If the fan rotational speed is increased to improve cooling performance, then the cooling efficiency is improved, but the noise increases
Solution Approach 1:
The fan rotational speed is dynamically adjusted based on engine output mode detection. When the engine operates at low output, the fan speed is reduced accordingly, which significantly decreases noise generation. This dynamic control ensures that the fan only operates at high speeds when actually needed for cooling, thereby minimizing noise pollution.
Solution Approach 2:
The operational parameter of fan rotational speed is changed according to the engine output mode. By reducing the speed parameter during low-output operations, the system effectively lowers the noise level while still maintaining sufficient cooling capability when required.
3Device complexity
If the fan rotational speed is simply adjusted according to temperature and engine speed without considering engine output, then the control system is simple, but the cooling efficiency is suboptimal
Solution Approach 1:
The system implements feedback control by detecting the engine output mode and using this information to adjust the fan rotational speed. The engine output mode detection unit provides feedback signals to the control unit, which then adjusts the fan speed accordingly. This feedback mechanism ensures optimal cooling efficiency without excessive complexity.
Solution Approach 2:
The control system automatically adjusts the fan speed based on detected engine conditions without requiring manual intervention. The system serves itself by detecting its own operational state and making appropriate adjustments to maintain optimal cooling efficiency across different operating conditions.
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
This approach reduces fuel consumption and fan noise by optimizing fan speed based on engine output modes, enhancing heat dissipation performance while preventing overheating.
Implementation Method 1
a radiator for cooling a cooling water of the engine; a fan device that blows external air at the radiator
Implementation Method 2
a thermostat, provided upon a path that conducts the cooling water to the radiator, and that opens and closes the path between fully closed and fully open according to a temperature of the cooling water
Data Source
AI summary
A work machine includes a thermostat provided upon a path that conducts the cooling water to the radiator, and that opens and closes the path according to a temperature of the cooling water, a fan device that blows external air at the radiator, an output changeover switch that changes over output of the engine between high and low, a rotational speed setting unit that sets a rotational speed for the fan device according to the temperature of the cooling water, and a rotational speed adjustment unit that adjusts rotational speed of the fan device, wherein, within a temperature range for the cooling water in which the thermostat is fully opened from fully closed, the rotational speed of the fan device to be lower when the output changeover switch is changed over so as to limit the output of the engine.