Vehicle Burner Fuel Pressure Control for Combustion Efficiency
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Solution Overview
Problem
Existing vehicle burners face inefficiencies in fuel conversion, particularly at lower loads, leading to fuel accumulation on combustion chamber walls and reduced pollutant emission effectiveness.
Innovation Solution
Adapting fuel pressure in response to heating output by determining optimal fuel quantity, air quantity, and air-fuel ratio, and adjusting injection parameters such as droplet size and speed to enhance fuel-air mixing and vaporization, with the controller using characteristic diagrams to set simultaneous operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fuel pressure is kept constant for all load conditions, then the fuel system is simple to operate, but fuel conversion efficiency deteriorates at lower loads causing fuel accumulation on chamber walls
Solution Approach 1:
The fuel pressure is made dynamic and adaptable to different load conditions. The controller adjusts the fuel pressure based on the heating output requirement, transitioning from a static constant pressure system to a dynamic pressure control system that optimizes fuel injection for each operating condition.
Solution Approach 2:
The fuel pressure parameter is changed according to the load condition. The controller determines appropriate fuel pressure values based on the heating output, air quantity, and fuel quantity, adjusting this critical parameter to optimize fuel conversion efficiency at different operating points.
2Productivity
If high fuel pressure is used for high load conditions, then fuel injection performance is improved, but fuel accumulation and coking occur at lower loads with small air quantities
Solution Approach 1:
The fuel pressure parameter is dynamically adjusted to match the operating conditions. At high loads, higher pressure ensures good fuel injection performance, while at lower loads with small air quantities, the pressure is reduced to prevent fuel accumulation and coking on chamber walls.
Solution Approach 2:
The controller uses feedback from sensors monitoring air quantity, fuel quantity, and heating output to determine the optimal fuel pressure. This closed-loop control ensures that fuel pressure is always appropriate for the current operating conditions, preventing both poor injection performance and fuel accumulation.
3Power
If fuel quantity is increased to meet heating demand, then heating output is improved, but air-fuel mixing quality deteriorates due to reduced air velocity
Solution Approach 1:
The fuel pressure parameter is adjusted to compensate for changes in air quantity and mixing conditions. By optimizing fuel pressure based on the current air quantity and heating demand, the system maintains good air-fuel mixing quality across different load conditions while meeting the required heating output.
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 improves fuel conversion efficiency, reduces fuel accumulation on chamber walls, and enhances pollutant emission reduction by optimizing fuel injection for varying load conditions.
Implementation Method 1
a fuel pump (10) for delivering fuel to an actuatable injection nozzle (11)... the fuel pump (10) to set the determined fuel pressure
Implementation Method 2
Fuel can be injected into a combustion chamber with the aid of the operable injection nozzle (11), the so-called injector... the injection nozzle (11) to set the determined fuel quantity
Implementation Method 3
an air conveying and/or air control device (16)... the air delivery and/or air control device (16) to supply an associated amount of air
Implementation Method 4
mixing of fuel and air, vaporization of injected droplets, and interaction between injected droplets and air in general
Implementation Method 5
vaporization of injected droplets
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a vehicle burner (6) for heating a gas flow (14) in a motor vehicle, comprising a fuel pump (10) for supplying fuel to an actuable injection nozzle (11) for injecting the fuel into a combustion chamber (7), an air supply device (16) for supplying air to the combustion chamber (7), and a control unit (17) for operating the vehicle burner (6), which is coupled to the fuel pump (10), to the air supply and/or air control device (16) and to the injection nozzle (11), wherein burner exhaust gas, which is produced during the operation of the vehicle burner (6) by the reaction of fuel with air in the combustion chamber (7), is used to heat the gas flow (14).To increase efficiency, the control unit (17) determines a fuel quantity, an air quantity and a fuel pressure depending on a predetermined heating output, wherein the control unit (17) actuates the air supply and/or air control device (16) to adjust the determined air quantity, the fuel pump (10) to adjust the determined fuel pressure and the injection nozzle (11) to adjust the determined fuel quantity.