CVT Cooling Duct for Oxygen Sensor Temperature Control
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Solution Overview
Problem
Temperature-sensitive devices in vehicles, such as oxygen sensors, face operational reliability issues and shortened lifespans due to exposure to extreme temperatures from heat sources like engine exhaust systems, and may also be subjected to temperatures outside their specified range in varying climates.
Innovation Solution
A system utilizing a drivetrain duct to ventilate temperature-sensitive devices with drivetrain exhaust gas, which is cooler and at a lower pressure than the ambient air, to maintain the devices within a specified temperature range, thereby preventing overheating or underheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the oxygen sensor is mounted directly to the exhaust pipe to monitor oxygen content, then the sensor can effectively sample exhaust gas, but the sensor is exposed to temperatures exceeding its upper bound specification
Solution Approach 1:
The exhaust system is segmented into two functional zones: a hot zone for oxygen sampling and a cooler zone for sensor housing. The exhaust pipe is separated from the sensor mounting location, allowing the sensor to be positioned in a thermally favorable environment while maintaining exhaust gas access through ducting.
Solution Approach 2:
A cooling duct system acts as an intermediary between the hot exhaust gas and the temperature-sensitive oxygen sensor. This duct provides a thermal barrier while allowing the sensor to monitor exhaust composition without direct thermal contact.
2Reliability
If the sensor is positioned close to the heat source to function properly, then the sensor can monitor exhaust conditions, but the device lifespan is shortened due to excessive heat exposure
Solution Approach 1:
The system separates the sensing function from the thermal environment by dividing the exhaust monitoring system into a sampling interface (close to exhaust) and a sensor housing (in cooler environment), connected through thermal isolation barriers.
Solution Approach 2:
Thermal barriers and cooling ducts serve as intermediaries that protect the sensor from direct heat exposure while maintaining its ability to monitor exhaust gas composition, thereby extending operational lifespan.
3Adaptability or versatility
If the device is operated in cold climates, then the vehicle can function in various environments, but the device temperature falls below the lower bound of the temperature specification
Solution Approach 1:
The exhaust gas is utilized for dual purposes: oxygen sampling and thermal management. The same exhaust stream that contains the measurement target also serves as a heat source to warm the sensor in cold climates, making the system adaptable to both hot and cold environments.
Solution Approach 2:
The exhaust gas, which would otherwise be purely a thermal hazard to the sensor, is converted into a beneficial heating source during cold operation, maintaining sensor temperature within operational specifications across varying climate 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 regulates the temperature of devices like oxygen sensors, ensuring reliable operation and extended lifespan by utilizing the temperature differential between drivetrain exhaust and ambient air, while also addressing temperature extremes in different climates.
Implementation Method 1
A system utilizing a drivetrain duct to ventilate temperature-sensitive devices with drivetrain exhaust gas
Implementation Method 2
The system effectively regulates the temperature of devices like oxygen sensors, ensuring reliable operation and extended lifespan by utilizing the temperature differential between drivetrain exhaust and ambient air
Data Source
AI summary
Methods, systems, and vehicles that control the temperature of a device included in the vehicle are presented herein. The temperature of the device is controlled by ventilating the device with drivetrain air, such as transmission cooling air. In some embodiments, the device is at a greater temperature than the drivetrain air, which cools the device. In other embodiments, the device is at a lesser temperature than the drivetrain air, which heats the device. The drivetrain air is provided to the device through an exhaust duct coupled to the vehicle's transmission. The drivetrain exhaust air is preferably circulated by the transmission. The transmission may be a continuously variable transmission. The device may be an oxygen sensor that is coupled to an engine exhaust pipe. The oxygen sensor is thermally coupled to the engine exhaust and the engine exhaust pipe, which are at greater temperatures than the transmission exhaust air.