Vehicle Fan Speed Control via Retarder Torque Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fan speed control methods in vehicle engine cooling circuits are inefficient, leading to excessive cooling, increased fuel consumption, and suboptimal power absorption due to discrete speed levels, which do not effectively manage temperature and energy usage.
Innovation Solution
A method for continuous control of fan rotation speed, decoupled from the drive shaft, using a combination of control strategies and pulse modulation to optimize fan speed based on real-time fuel consumption and thermal management, allowing for precise temperature control and reduced fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotates at maximum speed continuously, then the engine cooling performance is improved, but the fuel consumption increases and power is wasted
Solution Approach 1:
The patent applies dynamics by transitioning from static discrete speed levels to continuous dynamic speed control. The control unit continuously adjusts the fan rotation speed based on real-time temperature sensor feedback, allowing the fan to operate at any speed between minimum and maximum rather than being constrained to fixed discrete levels. This dynamic adjustment optimizes the balance between cooling performance and energy consumption.
Solution Approach 2:
The patent implements parameter changes by modifying the fan speed parameter continuously based on temperature conditions. Instead of using fixed discrete speed parameters, the system varies the rotation speed parameter dynamically according to the measured temperature, enabling precise control of cooling intensity to match actual thermal requirements and reduce unnecessary energy consumption.
2Device complexity
If discrete speed levels are used for fan control, then the device complexity is reduced, but the fuel consumption optimization is insufficient
Solution Approach 1:
The patent replaces mechanical discrete speed control mechanisms with an electronic control system. Instead of using mechanical devices with fixed gear ratios or discrete positions, the system uses an electronic control unit that receives temperature signals and generates continuous speed control signals, substituting mechanical complexity with electronic control precision.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the engine temperature through sensors and using this information to adjust the fan speed. The control unit receives temperature feedback, compares it with reference values, and dynamically adjusts the fan rotation speed accordingly, creating a closed-loop control system that optimizes fuel consumption while maintaining adequate cooling.
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 optimizes fuel consumption and maintains efficient engine cooling by enabling continuous fan speed adjustment, reducing energy waste and improving engine performance.
Implementation Method 1
the electromagnetic coupling, which generate a friction coupling between fan and engine
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Method for controlling the rotation speed of a fan of an engine cooling circuit in a vehicle, comprising the steps of: evaluating the contributions to the fan rotating speed deriving from the presence of the retarder and of the engine unit, according to the difference between a reference temperature value (2) of the fluid of the engine cooling system and a current measured temperature (3) of the fluid in the engine cooling system, and according to a percentage value (4) of the braking torque required by the retarder or according to a measured value (5) of current speed of the fan; obtainment of the fan rotation speed by adding up the contributions given by the retarder and the engine system.