Parallel Heating Elements with PWM Control for Fluid Lines
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Solution Overview
Problem
Existing fluid line heating systems require specific design for each length, leading to high material and production costs due to the need for constant heating power per length unit, and inefficiencies in manufacturing and stocking different lengths.
Innovation Solution
Electric heating elements are operated in parallel, with separate control for each element to adjust heating power using PWM-controlled operating voltage, allowing for independent regulation of heating power based on temperature and length, reducing the need for uniform heating power per length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heating elements are connected in series with constant heating power per length unit, then uniform heating along the line is achieved, but material costs and manufacturing complexity increase due to requiring different heating power designs for different line lengths
Solution Approach 1:
The heating line is divided into multiple independently controllable heating elements (first heating element, second heating element, etc.) that can be separately controlled. Each heating element can be adjusted individually via PWM control to achieve the desired heating distribution without requiring different designs for different line lengths.
Solution Approach 2:
The heating power of each heating element is made dynamically adjustable through separate PWM control signals. This allows the heating system to adapt to different line lengths and thermal requirements in real-time, eliminating the need for fixed heating power designs for each application.
2Reliability
If heating elements are designed with specific heating power for each line length, then optimal heating performance is achieved, but production costs and stocking requirements increase
Solution Approach 1:
A single universal heating element design can serve multiple line lengths and applications through individual PWM control. The same heating element module can be used across different configurations, eliminating the need to manufacture and stock multiple specialized versions for different line lengths.
Solution Approach 2:
The heating power parameters of each heating element can be independently adjusted through PWM duty cycle control. This allows a single physical design to deliver different heating powers as needed, replacing the need for multiple fixed-power designs.
3Adaptability or versatility
If separate control for each heating element is implemented, then flexible heating power adjustment is achieved, but control system complexity increases
Solution Approach 1:
PWM (pulse-width modulation) control is used to regulate the power supplied to each heating element through periodic switching. This provides precise control over heating power while using simple, well-established control circuitry that is easy to implement and manage.
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 approach allows for flexible and cost-effective heating power adjustment regardless of line length, reducing material costs and manufacturing complexity while maintaining consistent heating performance.
Implementation Method 1
electric heating elements can be activated at low temperatures in order to prevent freezing, or to thaw an already frozen medium
Implementation Method 2
each heating element is supplied separately with its separate operating voltage, wherein each operating voltage is generated from a supply voltage (in particular DC voltage from a vehicle battery) by a PWM (pulse width modulated) control clock
Data Source
AI summary
A method for heating a fluid line system with at least two electric heating elements (R1, R2, R3), which are operated electrically in parallel and each heating element (R1/R2/R3) is separately supplied with a controlled operating current (I1/I2/I3) for adjusting its heating power. Furthermore, the invention relates to a heating system for such a fluid line system (1), in particular for the application of the method according to the present invention. The heating system has heating elements (R1-R3) which are electrically connected in parallel and are each connected to a separate control element (T1, T2, T3). Each heating element (R1/R2/R3) can be controlled via its associated control element (T1, T2, T3) for the individual adjustment of its heating power.