Tire Inner Liner Temperature Calculation via Vehicle Dynamics
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Solution Overview
Problem
Existing methods for determining the temperature of a tire's inner liner in motor vehicles are costly due to the use of expensive infrared sensors, making them impractical for series-manufactured vehicles.
Innovation Solution
A method that calculates the saturation temperature of the inner liner using ambient temperature, inflation air temperature, and vehicle movement dynamics variables, allowing for the determination of the inner liner temperature through integration, eliminating the need for expensive sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared sensors are used to determine the temperature of the inner liner, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces an intermediary calculation model that uses easily measurable parameters (inflation air temperature, ambient temperature, vehicle dynamics) to indirectly determine the inner liner temperature. Instead of directly measuring the difficult-to-access inner liner temperature with complex infrared sensors, the system uses a thermal model with transfer coefficients to calculate the temperature through intermediate steps, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent replaces the mechanical/optical measurement system (infrared sensors) with a computational/thermodynamic model. By substituting physical measurement hardware with mathematical calculations based on thermal physics principles, the system achieves accurate temperature determination without requiring complex sensing equipment
2Reliability
If infrared sensors are installed in each tire region, then temperature determination reliability is improved, but manufacturing cost increases
Solution Approach 1:
The system uses data that is already available from the vehicle's existing sensor network (inflation pressure sensors, ambient temperature sensors, vehicle dynamics sensors) to calculate tire temperature. By making the existing system serve the additional function of temperature measurement through computational processing, the patent achieves reliable temperature determination without adding expensive specialized sensors
Solution Approach 2:
The patent transforms the measurement approach from direct physical measurement to indirect parameter-based calculation. By changing from measuring temperature directly with infrared sensors to calculating temperature from other parameters (pressure, ambient temperature, vehicle dynamics), the system maintains reliability while dramatically reducing manufacturing cost
Data Source
AI summary
A method for determining a temperature of a tire of a motor vehicle, specifically a temperature of an inner liner of the respective tire, having at least the following steps: a saturation temperature is determined for the inner liner of the respective tire as a function of an ambient temperature, as a function of a temperature of the inflation air of the respective tire and as a function of vehicle movement dynamics variables; the temperature of the inner liner of the respective tire is determined by integration as a function of the determined saturation temperature of the inner liner of the respective tire.