Roof-Mounted Sensor Pod Thermal Management
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Solution Overview
Problem
Autonomous vehicle sensors, particularly those located in roof-mounted pods, face issues with excessive temperature and fogging or frosting due to environmental conditions, which can impair their functionality.
Innovation Solution
A roof-mounted sensor pod system incorporating a central opening for air exchange, fluid nozzles for cleaning, and pneumatic lines for air brush systems, connected to a vehicle's air duct, maintains sensor windows clear and within an acceptable temperature range by using a combination of fluid and air to prevent condensation and regulate temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are placed in a protective pod on the roof, then the sensors are protected from environmental damage, but the pod becomes very warm on sunny days and windows may become fogged or frosted
Solution Approach 1:
The pod structure is segmented into multiple functional zones: sensor mounting area, fluid nozzle array, air brush system components, and ventilation pathways. This segmentation allows different regions to serve specific thermal management functions while maintaining overall protection.
Solution Approach 2:
Fluid nozzles and air brush systems act as intermediary elements between the external environment and the sensors. These intermediaries deliver cooling fluids and compressed air to prevent fogging and regulate temperature without direct exposure of sensors to harsh conditions.
2Reliability
If sensors are placed in a protective pod on the roof, then the sensors are protected from environmental damage, but the windows in the pod may become fogged or frosted with high humidity and cold temperatures
Solution Approach 1:
The system applies preliminary anti-action by using fluid nozzles to pre-treat windows with hydrophobic coatings before condensation can form. Air brush systems are positioned to deliver compressed air that prevents moisture accumulation before fogging occurs.
Solution Approach 2:
The pod system incorporates self-service capabilities through integrated fluid nozzles and air brush systems that automatically activate based on environmental conditions. The system monitors humidity and temperature to trigger appropriate countermeasures without external intervention.
3Reliability
If the pod is sealed to protect sensors, then environmental protection is improved, but temperature regulation and condensation prevention become more difficult
Solution Approach 1:
The fluid nozzle system serves multiple functions: cooling the pod interior, preventing fogging on windows, and removing condensation. The air brush system similarly provides both cooling and drying functions, reducing the need for separate dedicated systems for each thermal management task.
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 maintains sensor windows clear and within an optimal temperature range, ensuring continuous situational awareness data collection from sensors like cameras and LIDAR, even in varying environmental conditions.
Implementation Method 1
A vented headliner is disposed between the passenger cabin and the cavity
Implementation Method 2
The pod may also include a plurality of fluid nozzles directed at the windows of the pod
Implementation Method 3
The pod may yet further include a plurality of air brush nozzles directed at the windows of the pod
Data Source
AI summary
A pod includes a base, a plurality of sensor attachment fixtures, and a shell. The base is complementary in shape to a vehicle roof and includes a central opening therethrough. The sensor attachment fixtures are fixed to the base adjacent to an outer periphery of the base. The shell is fixed to and covers the base. The shell defines a cavity enclosing the sensor attachment fixtures and has a plurality of windows aligned with the sensor attachment fixtures.