CVT Belt Temperature Sensing With Isolated Infrared Housing
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Solution Overview
Problem
Current CVT cooling systems fail to maintain safe temperatures under varying conditions, leading to potential component failure without adequate feedback for operators, and existing temperature monitoring methods are inadequate for preventing belt overheating and subsequent failure.
Innovation Solution
The implementation of thermally isolated infrared temperature sensors and resistance temperature detectors to monitor belt and air temperatures within the CVT system, providing real-time feedback to reduce load and prevent overheating, with the use of thermally insulating materials and configurations to ensure accurate readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air cooling is used to minimize heat buildup in CVT, then heat dissipation is improved, but the system requires sealed housing with gaskets to protect from contaminants, which complicates the design and may impede cooling efficiency
Solution Approach 1:
The patent implements temperature sensors (infrared and RTD) that continuously monitor CVT component temperatures and provide feedback to the control system. This enables real-time monitoring of heat buildup, allowing the system to detect temperature spikes and respond appropriately, resolving the contradiction by providing actionable temperature data while maintaining the sealed housing design.
Solution Approach 2:
The patent uses thermally isolated sensor housings as intermediaries that allow temperature measurement without direct thermal contact between the sensors and the CVT components. This intermediary approach enables accurate temperature monitoring while maintaining the sealed housing integrity and not interfering with the cooling airflow path.
2Reliability
If temperature monitoring is implemented to prevent overheating, then component reliability is improved, but the device complexity increases due to additional sensors and thermal isolation requirements
Solution Approach 1:
The patent employs thermally isolated sensor housings that act as intermediaries, allowing temperature sensors to measure CVT component temperatures without direct thermal contact. This approach enables reliable temperature monitoring while avoiding the complexity of integrating sensors directly into the thermal path or requiring extensive thermal management of the sensors themselves.
Solution Approach 2:
The patent replaces direct mechanical/thermal contact sensing with non-contact infrared temperature sensors and thermally isolated RTD sensors. This substitution eliminates the need for complex thermal coupling mechanisms or direct sensor integration into moving parts, reducing device complexity while maintaining reliable temperature monitoring capability.
3Loss of time
If infrared sensors are used for rapid temperature detection, then response time to temperature spikes is improved, but manufacturing precision requirements increase due to thermal isolation demands
Solution Approach 1:
The patent uses thermally isolated sensor housings as intermediaries that provide sufficient thermal blocking without requiring extremely tight manufacturing tolerances. The isolation housing design achieves effective thermal separation through its structure and material selection, allowing infrared sensors to detect temperature spikes rapidly while maintaining manufacturability with reasonable precision requirements.
Solution Approach 2:
The patent applies thermal isolation selectively at the sensor housing level rather than requiring system-wide thermal management precision. By concentrating the thermal isolation function in the local sensor housing structure, the system achieves rapid temperature detection capability without demanding high manufacturing precision across the entire CVT assembly.
4Measurement precision
If thermally isolated sensors are positioned close to belt for accurate readings, then measurement precision is improved, but the risk of sensor damage from debris and broken belts increases
Solution Approach 1:
The patent positions the temperature sensors within isolated sensor housings that serve as protective intermediaries between the sensors and the hazardous CVT environment. This intermediary housing structure allows the sensors to remain close enough to the belt for accurate temperature measurement while providing physical protection against debris and broken belts that could otherwise damage exposed sensors.
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 solution effectively prevents CVT component failures by providing timely temperature feedback, allowing for load reduction and cooling, thereby extending belt life and ensuring safe operating conditions, with the infrared sensors offering rapid response to temperature spikes and the RTD sensors providing reliable long-term monitoring.
Implementation Method 1
an infrared temperature sensor aimed at the belt of the CVT
Implementation Method 2
resistance temperature detectors to monitor belt and air temperatures
Implementation Method 3
use of thermally insulating materials and configurations to ensure accurate readings
Data Source
AI summary
A system and method are presented that measure the temperature of a component in a continuously variable transmission (CVT) system. An infrared temperature sensor is mounted in a thermally insulating sensor housing such that the sensor is located within the interior of a CVT housing and aimed at the component. The component can be a belt in the CVT system or a stationary sheave in one of the two clutches of the CVT system. The sensor housing can have a cup and a stem with the sensor being positioned within that portion of the sensor housing positioned within the interior of the CVT housing. When the stem is in the interior of the CVT housing, a nut can be used to secure the sensor housing to the CVT housing while protecting the infrared sensor from damage. An air temperature sensor in the exhaust port can provide supplemental temperature readings.