Fuel Injection Valve Compression Chamber Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel injection valves face challenges in enhancing the response of the valve element due to the large volume of the compression chamber, which hinders prompt pressurization of fuel and thus affects the control performance and fuel injection accuracy.
Innovation Solution
A fuel injection valve design that includes a compression unit for pressurizing fuel in the compression chamber, a valve element with a pressure-receiving portion, and a regulating unit within the compression chamber to control the movement of the valve element, utilizing a piezo actuator and pistons to reduce the compression chamber volume and enhance the valve element's response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the compression chamber volume is increased to accommodate components such as the spring, then the components can be properly housed, but the piston cannot promptly pressurize fuel in the compression chamber, resulting in slower valve element response
Solution Approach 1:
The compression chamber is divided into two separate chambers: a first compression chamber for accommodating the spring and a second compression chamber for fuel pressurization. This segmentation allows the spring to be housed without increasing the volume of the fuel pressurization chamber, enabling prompt fuel pressurization while maintaining adequate space for components.
Solution Approach 2:
A communication passage connects the first compression chamber (with spring) to the second compression chamber (for fuel pressurization). This intermediary passage allows the spring's biasing force to be transmitted to the piston, which then pressurizes the fuel in the second chamber, achieving both component accommodation and rapid fuel pressurization.
2Speed
If the compression chamber volume is reduced to enable prompt fuel pressurization, then the valve element response is enhanced, but there is insufficient space to accommodate components such as the spring
Solution Approach 1:
The compression chamber is divided into two separate chambers: a first compression chamber for accommodating the spring and a second compression chamber for fuel pressurization. This segmentation allows the spring to be housed without increasing the volume of the fuel pressurization chamber, enabling prompt fuel pressurization while maintaining adequate space for components.
Solution Approach 2:
The first compression chamber (containing the spring) and second compression chamber (for fuel) are nested within the overall compression chamber structure, with the communication passage allowing functional integration. This nesting arrangement accommodates multiple components within a compact overall volume while maintaining rapid fuel pressurization capability.
3Device complexity
If a large volume compression chamber is used to accommodate components, then all necessary components can be housed, but the control performance and fuel injection accuracy are reduced due to slower response
Solution Approach 1:
The compression chamber is divided into two separate chambers: a first compression chamber for accommodating the spring and a second compression chamber for fuel pressurization. This segmentation allows the spring to be housed without increasing the volume of the fuel pressurization chamber, enabling prompt fuel pressurization while maintaining adequate space for components.
Solution Approach 2:
A communication passage connects the first compression chamber (with spring) to the second compression chamber (for fuel pressurization). This intermediary passage allows the spring's biasing force to be transmitted to the piston, which then pressurizes the fuel in the second chamber, achieving both component accommodation and rapid fuel pressurization.
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
The design improves the response of the valve element, allowing for more precise and efficient fuel injection, reducing the volume of the compression chamber and stabilizing fuel injection, even in hydraulically driven systems, thereby enhancing the overall control performance.
Implementation Method 1
utilizing a piezo actuator and pistons to reduce the compression chamber volume and enhance the valve element's response
Implementation Method 2
a compression unit for pressurizing fuel in the compression chamber
Data Source
AI summary
A fuel injection valve includes a main body having a nozzle hole and a compression chamber. The main body accommodates a compression unit for pressurizing fuel accumulated in the compression chamber. The fuel injection valve further includes a valve element being axially movable in the main body. The valve element includes a valve portion and a pressure-receiving portion. The valve portion is movable in an opening direction to open the nozzle hole in response to pressure of fuel being pressurized by the compression unit and applied to the pressure-receiving portion. A regulating unit is provided in the compression chamber for regulating movement of the valve element with respect to the opening direction.