Spring-Loaded Fuel Pressurization Device for Engine Startability
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Solution Overview
Problem
Existing engine units lack the capability to supply pressurized fuel necessary for improved starting performance, relying solely on priming pumps and engine negative pressure for fuel delivery.
Innovation Solution
A fuel pressurization device that utilizes an electromagnetic valve, a deformable elastic body, and an overflow valve to store and pressurize fuel in a variable volume chamber, ensuring pressurized fuel delivery to the engine upon startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a priming pump is used to supply fuel to the carburetor, then fuel can be delivered to the engine, but the fuel cannot be supplied with sufficient pressure to improve starting performance
Solution Approach 1:
The fuel pressurization device performs preliminary pressurization of fuel before the engine starts. The elastic body is pre-compressed by the spring to store potential energy, and when the electromagnetic valve opens, this stored energy is immediately released to deliver pressurized fuel to the carburetor, improving starting performance without requiring continuous high-pressure pumping
Solution Approach 2:
The patent replaces a mechanical high-pressure pump system with a spring-elastic body pressurization system. The spring provides continuous mechanical force to compress the elastic body, storing energy that is then released through the electromagnetic valve control, achieving fuel pressurization without complex mechanical pumping mechanisms
2Reliability
If fuel is simply delivered by priming pump and engine negative pressure, then the system remains simple, but starting performance cannot be improved
Solution Approach 1:
The patent combines multiple functions into a single integrated pressurization device: the spring provides continuous force, the elastic body stores and releases energy, the electromagnetic valve controls timing, and the check valve prevents backflow. This merged system achieves pressurization functionality without requiring separate high-pressure pump, accumulator, and control valve assemblies
Solution Approach 2:
The spring-elastic body system is self-charging through the spring's continuous compressive force, eliminating the need for external power sources or complex control systems. The electromagnetic valve simply needs to open/close to trigger the pre-loaded pressurization mechanism, making the system simple to control while achieving improved starting performance
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
Enhances engine startability by vigorously supplying pressurized fuel upon engine startup, allowing for efficient fuel management and adaptation to varying fuel requirements across different engine types.
Implementation Method 1
a fuel chamber (R) including the elastic body (20) and having a variable volume; a spring (30) located between the first main body portion (11) and the elastic body (20), the spring (30) applying a pressure to the fuel in the fuel chamber (R)
Implementation Method 2
pressure-feeds the starting fuel supplied from the priming pump (3) to the engine (2) via the electromagnetic valve (4)
Data Source
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AI summary
A fuel pressurization device pressure-feeds starting fuel supplied from a pump to an engine via a valve. The fuel pressurization device includes: a fuel chamber forming portion including a fuel chamber to which the fuel is supplied from the pump and whose internal volume is variable; and a spring configured to bias the fuel chamber forming portion such that the volume of the fuel chamber decreases.