Rearward Fan Ventilation for Engine Room Cooling
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Solution Overview
Problem
Conventional vehicle designs where the engine is positioned behind the seats pose challenges in efficiently ventilating the engine room due to difficulties in directing air flow effectively, especially at high speeds where negative pressure outside the vehicle hampers air discharge.
Innovation Solution
A vehicle design featuring a rotating fan positioned rearward of the seats, an air-path portion on the side surface, and a pressure sensor to detect wind pressure, allowing the fan's direction to be controlled for efficient air introduction and discharge to the engine room, regardless of wind pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the engine is disposed behind the seats, then the vehicle layout flexibility is improved, but the air flow efficiency to the engine room deteriorates
Solution Approach 1:
The fan is designed to rotate in variable directions (forward and backward) based on vehicle operating conditions. The controller adjusts the fan's rotation direction according to vehicle speed and external pressure conditions, enabling dynamic adaptation to different airflow scenarios and maintaining effective engine room ventilation regardless of the rearward engine position.
2Speed
If the vehicle travels at high speed, then the vehicle performance is improved, but the air discharge efficiency from the engine room deteriorates due to negative pressure
Solution Approach 1:
The system incorporates pressure sensors that detect external pressure conditions and provide feedback to the controller. Based on this feedback, the controller adjusts the fan's operation mode (rotation direction and speed) to compensate for negative pressure effects during high-speed travel, ensuring continuous effective air discharge from the engine room.
Solution Approach 2:
The fan's rotation direction is dynamically changed based on vehicle speed and pressure conditions. At high speeds where negative pressure hinders air discharge, the fan rotates in reverse to actively push air out of the engine room, overcoming the adverse pressure gradient created by vehicle motion.
3Device complexity
If a fixed air-path portion is provided on the side, then the structural simplicity is improved, but the adaptability to varying wind pressure conditions deteriorates
Solution Approach 1:
While the air-path portion maintains a fixed simple structure, the system achieves adaptability through dynamic fan control. The fan's variable rotation direction compensates for the fixed air-path's inability to adapt, allowing the simple structural design to effectively handle varying wind pressure conditions through active flow management.
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 configuration ensures effective air flow to the engine room even when the engine is rearward of the seats, enhancing cooling and ventilation by adapting to varying wind pressures during travel and stopping conditions.
Implementation Method 1
a rotating fan located more rearward than the first seat and the second seat to introduce/discharge air through the air-path portion to/from a region where the engine is disposed
Implementation Method 2
the detector detects information correlated with a wind pressure near the air-path portion as the condition of the vehicle
Data Source
AI summary
A vehicle includes an air-path portion, an engine, and a rotating fan located more rearward than first and second seats. A wind pressure near the air-path portion located on a side surface of the vehicle is detected by a pressure sensor, and based on a detection result, an ECU controls a direction of rotation of the rotating fan. The rotating fan introduces/discharges air to/from an engine room via the air-path portion. If the pressure sensor detects a negative pressure, the rotating fan is controlled so as to discharge air from the engine room via the air-path portion. On the other hand, if the pressure sensor detects zero or a positive pressure, the rotating fan is controlled so as to introduce air to the engine room from the air-path portion.