Injection Valve Flow Force Reduction for Exhaust Regeneration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional injection valves used for regenerating particulate filters in internal combustion engines often clog due to soot residues, leading to decreased metering efficiency and potential failure in maintaining sufficient regeneration, and exhibit chattering operations due to pressure fluctuations.
Innovation Solution
The design includes an injection valve with a larger outer head diameter than the outer seat diameter, a straight valve seat cut edge, and a flattened ball-shaped external curvature, which reduces flow force over the stroke and extends the pressure range for robust chattering behavior, along with a safety valve for emergency fuel shut-off and a metering valve for controlled fuel injection, ensuring reliable operation and reduced coking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional injection valves are used to meter fuel into the exhaust, then fuel injection for regeneration is achieved, but the ports become clogged with soot residues causing metering quantity to decrease
Solution Approach 1:
The invention extracts the problematic function of metering fuel directly at the injection valve by introducing a separate metering valve upstream. This separates the metering function from the injection function, allowing the injection valve to operate in a simple on/off manner without the complexity of precise metering, thereby reducing soot accumulation and coking in the injection valve ports.
Solution Approach 2:
A metering valve is introduced as an intermediary component between the fuel supply and the injection valve. This metering valve handles the precise fuel quantity control, while the injection valve simply delivers the metered fuel to the exhaust. The intermediary metering valve protects the injection valve from coking by preventing fuel starvation conditions that cause incomplete combustion and soot formation.
2Productivity
If injection valve opens and closes rhythmically to inject fuel, then fuel metering is achieved, but chattering operation occurs due to pressure fluctuations
Solution Approach 1:
The invention segments the fuel delivery system into two distinct functional stages: a metering stage handled by the metering valve that controls fuel quantity, and an injection stage handled by the injection valve that delivers fuel to the exhaust. This segmentation allows each component to optimize its operation - the metering valve manages pressure fluctuations smoothly, while the injection valve performs rapid on/off injection without chattering.
Solution Approach 2:
The system dynamically coordinates the operation of the metering valve and injection valve. The metering valve adjusts fuel flow dynamically to maintain stable pressure conditions, while the injection valve operates dynamically with precise on/off timing. This dynamic coordination eliminates chattering by ensuring the injection valve receives stable pressure conditions from the metering valve.
3Adaptability or versatility
If fuel pressure is not constant with pressure fluctuations and peaks, then fuel supply variability occurs, but chattering operation stops
Solution Approach 1:
The metering valve performs preliminary action by regulating fuel pressure and flow before the fuel reaches the injection valve. This preliminary pressure stabilization ensures that regardless of upstream pressure fluctuations or peaks, the injection valve receives consistently conditioned fuel, maintaining reliable chattering operation across a wide pressure range.
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 configuration enhances fuel spray preparation, extends the pressure range for stable operation, and prevents excessive coking, ensuring reliable regeneration and thermal management of exhaust system components, including particulate filters and NOx reservoirs.
Implementation Method 1
an injection valve (10), which injects fuel (4) into an exhaust line (3) of the exhaust system as a function of the pressure of the supplied fuel
Implementation Method 2
The injected fuel travels to an oxidizing converter that is situated upstream of the particulate filter. The fuel traveling into the oxidizing converter is oxidized and burned. thus increasing the exhaust temperature
Implementation Method 3
The regeneration is produced by increasing the temperature, for example to approximately 600° Celsius, which triggers combustion of the particulate matter, especially soot particles
Data Source
AI summary
The invention relates to a device for the regeneration, temperature loading and/or thermal management of a component, assigned to an exhaust system, of an internal combustion engine. The device includes at least one injection valve which injects a fluid, in particular fuel, into the exhaust system, preferably in chatter mode, for example as a function of the pressure of the supplied fluid. The injection valve has a valve head and a valve seat which have geometries designed in such a way that a fluidic force of the supplied fluid acting on the injection valve drops continuously over a stroke of the valve head. The invention also relates to an injection valve having such valve-head and valve-seat geometries and to a corresponding method for the regeneration, temperature loading and/or thermal management of a component, assigned to an exhaust system, of an internal combustion engine.