Work Vehicle Fan Control via Variable Speed Maps
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Solution Overview
Problem
Existing work vehicle systems fail to efficiently adjust the number of rotations of the fan to cool the condenser in an air conditioner, which is crucial for maintaining a comfortable operating environment and optimizing fuel efficiency.
Innovation Solution
A work vehicle equipped with a condenser, fan, variable mechanism, fan control unit, and outside air temperature sensor, utilizing control maps to adjust the fan's rotations based on the air conditioner's operating state and outside air temperature, with additional consideration for engine coolant and hydraulic oil temperatures, to optimize cooling efficiency and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotates at high speed to cool the condenser efficiently, then the cooling performance of the air conditioner is improved, but the fuel consumption of the engine increases
Solution Approach 1:
The fan clutch is designed as a variable mechanism that can dynamically adjust the fan's rotation speed based on operating conditions. The control system varies the fan speed continuously rather than maintaining a fixed high speed, optimizing the balance between cooling efficiency and fuel consumption across different operating scenarios.
Solution Approach 2:
The system changes the operational parameters of the fan by adjusting its rotation speed according to multiple inputs including air conditioner operating state, outside air temperature, engine coolant temperature, and hydraulic oil temperature. This parameter adjustment allows the system to achieve efficient condenser cooling only when necessary, reducing overall fuel consumption.
2Reliability
If the fan rotation speed is increased to cool the condenser, then the air conditioner cooling performance is improved, but the engine load increases
Solution Approach 1:
The fan clutch provides dynamic speed adjustment capability, allowing the system to increase fan speed only when cooling demand requires it. The control system monitors air conditioner operating state and adjusts fan speed accordingly, maintaining reliable cooling performance while minimizing unnecessary engine load during periods when full cooling capacity is not needed.
Solution Approach 2:
The control system automatically manages fan speed based on real-time monitoring of system conditions including air conditioner state, temperatures, and environmental factors. This self-regulating approach ensures cooling performance is maintained when needed while automatically reducing fan speed and engine load when cooling demands are lower.
3Productivity
If multiple control parameters are monitored and multiple control maps are used to adjust fan speed, then the cooling efficiency is optimized, but the control system complexity increases
Solution Approach 1:
The control strategy is segmented into multiple control maps, each optimized for specific operating conditions. The control system divides the overall control task into discrete mapping relationships between input parameters and fan speed settings, making the complex control logic more manageable and implementable through structured data tables rather than complex algorithms.
Solution Approach 2:
The control system integrates multiple monitoring functions and control decisions into a single unified fan control mechanism. The same control unit processes multiple input parameters (air conditioner state, outside temperature, coolant temperature, hydraulic oil temperature) and uses them collectively to determine fan speed, creating a multi-functional control system that manages various thermal conditions through a single coordinated approach.
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
The system efficiently controls the fan's rotations to match the air conditioner's operating state, enhancing cooling performance and improving fuel efficiency by adjusting fan speed according to different temperature maps and operational conditions.
Implementation Method 1
The fan cools the condenser
Data Source
AI summary
A work vehicle includes a condenser, a fan, a variable mechanism, a fan control unit, an outside air temperature sensor, and a storage unit. The condenser cools a cooling medium used in an air conditioner. The fan cools the condenser. The variable mechanism can change a number of rotations of the fan. The fan control unit controls the variable mechanism. The storage unit stores a plurality of control maps for setting the number of rotations of the fan to respective different numbers of rotations of the fan in accordance with the outside air temperature detected by the outside air temperature sensor. The fan control unit controls the variable mechanism in accordance with one control map selected from the plurality of control maps stored in the storage unit based on an operating state of the air conditioner, to control the number of rotations of the fan.