Fuel Heater Continuous Temperature Control via Air-Fuel Adjustment
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Solution Overview
Problem
Fuel-operated heaters, such as vehicle heaters, face challenges in achieving precise temperature control due to large jumps in heat output and control fluctuations when using two-point control methods, leading to noticeable changes in operating states and inefficient heat management.
Innovation Solution
A method that continuously adjusts the fuel and combustion air supply quantities based on the deviation between actual and target temperatures, allowing for continuous variation of heating output within a defined range, reducing jumps and fluctuations, and accounting for ambient temperature and altitude changes to maintain optimal combustion conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two-point control is used to set discrete heat output levels, then the heater can adapt to different heat requirements, but large jumps in heat output occur causing noticeable changes in operating states and control fluctuations
Solution Approach 1:
The patent applies parameter changes by continuously adjusting the heating output parameter based on the temperature deviation between actual and target temperatures. Instead of switching between discrete heat output levels, the system varies the heating power continuously according to the deviation magnitude, thereby eliminating large jumps in heat output and achieving stable temperature control without noticeable changes in operating states
2Device complexity
If discrete heating power levels are used, then the control system is simple, but the temperature regulation precision is insufficient due to large control fluctuations
Solution Approach 1:
The patent implements dynamics by transitioning from a static discrete control system to a dynamic continuous control system. The heating output is continuously adjusted based on real-time temperature deviation, allowing the system to adapt smoothly to changing conditions. This dynamic approach significantly improves temperature regulation precision while maintaining reasonable control system complexity through the use of a temperature sensor and control unit
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 enables precise and continuous temperature control, minimizing overshoots and noticeable changes in operating states, ensuring efficient heat management and adaptability to varying conditions, thus improving the adjustability and precision of temperature regulation in fuel-operated heaters.
Implementation Method 1
a burner area (12), a fuel supply arrangement (24) for supplying fuel (B) to the burner area (12) and a combustion air supply arrangement (18) for supplying combustion air (L) to the burner area (12)
Data Source
Figure 1
Figure 2~4
AI summary
The method involves determining an actual temperature (Tist) of a heated or to be heated medium, and comparing the actual temperature with a target temperature (Tsoll). A combustion air supply quantity and a fuel supply quantity are adjusted based on a difference of the actual temperature from the target temperature in such a manner that the actual temperature lies in or brought to a range of the target temperature. A continuous adjustment of the combustion air supply quantity and the fuel supply quantity are carried out based on a measure of the difference.