Transmission Cooling Fan Control to Avoid Vehicle Load Limiting
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Solution Overview
Problem
Existing vehicle cooling systems compromise vehicle performance by limiting load on the power transmission apparatus when temperature exceeds a threshold, leading to reduced fuel economy and drivability.
Innovation Solution
A cooling system with a temperature detection device and an electronic control apparatus that adjusts the rotational speed of a cooling fan based on temperature and vehicle speed to cool the power transmission apparatus before reaching the limit temperature, thereby preventing load limitation and maintaining original performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load is limited when temperature exceeds threshold, then power transmission apparatus is protected from overheating, but vehicle performance including fuel economy and drivability is compromised
Solution Approach 1:
The cooling fan is activated at a temperature threshold lower than the load limitation threshold, performing cooling action in advance before the power transmission apparatus reaches the critical temperature that would trigger load limitation. This preliminary cooling prevents the need for load reduction while maintaining apparatus protection.
2Temperature
If cooling fan rotational speed is increased to cool power transmission apparatus, then temperature is reduced effectively, but noise increases affecting ride comfort
Solution Approach 1:
The cooling fan rotational speed is dynamically adjusted based on the detected temperature of the power transmission apparatus. The fan-rotation control portion increases rotational speed when temperature is high and decreases it when temperature is low, optimizing cooling effectiveness while minimizing noise generation during normal operating conditions.
Solution Approach 2:
The system changes the operational parameter (rotational speed) of the cooling fan based on temperature conditions. By adjusting the fan speed parameter according to the detected temperature, the system achieves effective cooling when needed while reducing noise during milder temperature 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
The system effectively suppresses the transition to load limiting control, maintaining original vehicle performance by cooling the power transmission apparatus before reaching the limit temperature, while minimizing noise and ensuring ride comfort.
Implementation Method 1
a cooling fan configured to cool the power transmission apparatus
Data Source
AI summary
A cooling system for a vehicle that includes a temperature detection device for detecting a temperature related to a power transmission apparatus. The cooling system includes a cooling fan and an electronic control apparatus including a load limiting portion configured, when the detected exceeds a limit temperature value, to limit a load applied to the power transmission apparatus. The electronic control apparatus is configured to determine whether the detected temperature is equal to or higher than a fan-cooling temperature value that is lower than the limit temperature value, and to control rotation of the cooling fan, such that the cooling fan is rotated when the detected temperature is not lower than the fan-cooling temperature value, and such that a rotational speed of the cooling fan is higher when a temperature of the power transmission apparatus is high, than when the temperature of the power transmission apparatus is low.