Fuel Injection Pressure Control via Dynamic Valve Modulation
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Solution Overview
Problem
Existing fuel injection systems for reciprocating engines lack flexibility in controlling injection pressure, which affects fuel injection accuracy and emission levels, particularly across the entire engine operating range.
Innovation Solution
A fuel injection system with pressure control valves and a control unit that uses pulse width modulation to adjust fuel pressure dynamically, allowing for precise control of injection pressure through a network of fuel lines and pump elements, including a reciprocating plunger with helical control edges for adjustable injection timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fuel injection systems are used, then the system structure is simple, but the injection pressure control flexibility is insufficient
Solution Approach 1:
The patent introduces a pressure control valve that can dynamically adjust the injection pressure throughout the engine operating range, transforming the static pressure control system into a dynamic one. The control unit receives engine operating parameters and adjusts the pressure control valve accordingly, enabling flexible pressure control without requiring complete system redesign.
Solution Approach 2:
The patent changes the pressure parameter dynamically by controlling the pressure control valve opening degree based on engine operating conditions. This allows the injection pressure to be adjusted as a variable parameter rather than a fixed value, achieving adaptability across different engine loads and speeds while maintaining a relatively simple system structure.
2Manufacturing precision
If injection pressure control is improved, then fuel injection accuracy and emission levels improve, but system design complexity increases
Solution Approach 1:
The control unit receives feedback regarding engine operating parameters and the actual injection pressure, and adjusts the pressure control valve accordingly. This closed-loop feedback mechanism enables precise fuel injection accuracy and emission control while managing system complexity through intelligent control rather than mechanical complexity.
Solution Approach 2:
The patent replaces complex mechanical pressure control mechanisms with an electronically controlled pressure control valve and control unit. This substitution of mechanical systems with electronic control achieves precise injection pressure control and high fuel injection accuracy while keeping the overall system design relatively simple and cost-effective.
3Adaptability or versatility
If pressure control valve is added, then injection pressure control flexibility improves, but device complexity increases
Solution Approach 1:
The pressure control valve serves multiple functions: it controls injection pressure, adjusts fuel delivery timing, and adapts to different engine operating conditions. By making this single component multi-functional, the patent achieves high adaptability and versatile pressure control without proportionally increasing system complexity. The valve integrates pressure regulation, flow control, and timing adjustment in one device.
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 solution provides flexible and accurate fuel injection pressure control, reducing emissions and fuel consumption with minimal design and cost impact, applicable to both two and four-stroke diesel engines.
Implementation Method 1
The pump element (5) comprises a fuel chamber (6) in which a reciprocating plunger (7) is arranged. The reciprocation of the plunger (7) causes a pressurization of fuel in the fuel chamber (6).
Implementation Method 2
A return line (10) is connected to each fuel line (4) for discharging fuel from the fuel line (4). Each return line (10) is provided with a pressure control valve (12) for controlling fuel pressure in the fuel line (4).
Data Source
AI summary
A fuel injection system (1) for a reciprocating engine, comprising fuel injectors (2) for injecting fuel into engine cylinders, injection pumps (3) for feeding fuel to the injectors (2), each injection pump comprising at least one pump element (5) for pressurizing fuel to be injected. Each injector (2) is connected to a separate pump element (5) by means of a fuel line (4). A return line (10) is connected to the fuel line (4), which return line (10) is provided with a pressure control valve (12) for controlling fuel pressure in the fuel line (4). The fuel injection system (1) is provided with a control unit (29), which is configured to control the pressure control valve (12).