Offset Piston Injector for Flexible High-Pressure Fluid Control
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Solution Overview
Problem
Existing fuel injector systems for internal combustion engines require external pumping and control systems, which necessitate servicing and lack flexibility in injection timing and pressure, limiting their efficiency and reliability.
Innovation Solution
An injector apparatus with a first piston and high pressure pistons, where the high pressure pistons are offset and configurable to vary the ratio of working areas, allowing for high-pressure fluid compression and injection, even when combustion chamber pressure is higher, using a return spring for flexibility in fluid flow and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external pumping and control systems are used, then injection pressure and timing can be controlled, but the system complexity and servicing requirements increase
Solution Approach 1:
The patent merges the pump function and injection control function into a single integrated injector apparatus. The first piston acts as both a pump element (compressing fluid in the high pressure chamber) and a control element (timing injection via the injector valve), eliminating the need for separate external pumping and control systems while maintaining reliable injection pressure and timing control
Solution Approach 2:
The first piston performs multiple functions simultaneously: it compresses fluid to generate high pressure, controls the timing of injection through its connection to the injector valve, and regulates the amount of fluid injected. This multi-functionality reduces system complexity while maintaining reliable injection control
2Stress or pressure
If the first working area is greater than the high pressure working area, then high pressure compression is achieved, but the device complexity increases with multiple pistons and chambers
Solution Approach 1:
The patent uses hydraulic principles to achieve high pressure compression. The first piston compresses fluid in the high pressure chamber, and the pressure is transmitted through the fluid to the high pressure piston, which then acts on the injector valve. This hydraulic transmission allows high pressure generation with a simpler mechanical structure compared to direct mechanical linkage
Solution Approach 2:
The fluid in the high pressure chamber acts as an intermediary between the first piston and the high pressure piston. The first piston compresses the fluid, and the compressed fluid transmits the force to the high pressure piston, which then controls the injector valve. This intermediary fluid transmission simplifies the mechanical structure while maintaining high pressure capability
3Adaptability or versatility
If multiple high pressure pistons are used, then multi-strike injection capability is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the high pressure generation function into multiple independent high pressure pistons (first, second, and further high pressure pistons), each with its own high pressure chamber. This segmentation allows independent control of each piston to achieve multi-strike injection capability while maintaining modular manufacturing simplicity
Solution Approach 2:
The patent implements dynamic control of multiple high pressure pistons where each piston can be independently actuated at different times during the engine cycle. This dynamic operation enables flexible multi-strike injection patterns (single strike, double strike, or more) while using standardized piston designs that simplify manufacturing
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
Enables efficient and flexible high-pressure fluid injection with reduced need for external servicing, allowing for precise control over injection timing and pressure, including 'double strike' and multi-strike injection capabilities.
Implementation Method 1
the first piston being operable to compress fluid in the high pressure chamber using the high pressure piston
Implementation Method 2
using a return spring for flexibility in fluid flow and timing
Data Source
AI summary
An injector apparatus for injecting fluid under pressure into an associated chamber, the apparatus including a body, a first piston moveable in the body, the first piston defining a first working area facing an associated chamber, a high pressure piston defining a high pressure working area facing a high pressure chamber, the first working area being greater than the high pressure working area, the first piston being operable to compress fluid in the high pressure chamber using the high pressure piston, the first piston defining a first axis, the high pressure piston defining a second axis, wherein the second axis is offset from the first axis.