Seat heater, and temperature control method and temperature control program for seat heater
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Solution Overview
Problem
In seat heaters, a deviation occurs between the actual temperature of the seat trim cover and the temperature detected by the temperature detector, leading to inaccurate temperature control due to ambient temperature variations, which cannot be effectively eliminated by existing methods.
Innovation Solution
A seat heater system with a temperature detection unit and a control unit that calculates an estimated environmental temperature based on the rate of temperature increase after a predetermined heating period, correcting the target temperature to account for environmental temperature variations, thereby improving temperature control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature control is performed based on detected temperature, then temperature control function is provided, but temperature deviation between actual and detected temperature occurs due to ambient temperature variations
Solution Approach 1:
The system continuously monitors the temperature increase rate and uses this feedback to calculate environmental temperature and correct the target temperature dynamically, creating a closed-loop control system that compensates for ambient temperature variations
Solution Approach 2:
The temperature increase rate serves as an intermediary parameter that indirectly reflects environmental temperature conditions, allowing the system to infer and compensate for ambient temperature effects without directly measuring environmental temperature
2Ease of operation
If target temperature is fixed, then control simplicity is maintained, but temperature control accuracy decreases due to environmental temperature changes
Solution Approach 1:
The target temperature transitions from a fixed value to a dynamic value that automatically adjusts based on real-time temperature increase rate measurements, enabling the system to adapt to changing environmental conditions without complex manual intervention
Solution Approach 2:
The system changes the target temperature parameter dynamically by calculating corrections based on the temperature increase rate, allowing precise temperature control across different environmental conditions while maintaining automated operation
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 achieves high accuracy in controlling the seat trim cover temperature by adjusting the target temperature based on estimated environmental conditions, reducing temperature deviations and enhancing overall control precision.
Implementation Method 1
a heater that is provided between a seat cushioning material and a seat trim cover and includes a heating wire laid on a base material
Data Source
AI summary
A seat heater according to the present invention includes: a heater that is provided between a seat cushioning material and a seat trim cover and includes a heating wire laid on a base material; a temperature detection unit provided in the vicinity of the heating wire of the heater; and a temperature control unit configured to control a temperature of the heater so that it approaches a target temperature, in which the temperature control unit calculates an estimated environment temperature, which is an estimated value of a temperature around the temperature detection unit, based on a rate of increase of a temperature indicating an amount of change of the temperature detected by the temperature detection unit in a period after an elapse of a predetermined time from a start of heating the heater, and corrects the target temperature so that it becomes lower as the estimated environmental temperature becomes lower.