Fuel Injection Pump Separable Plunger Timing Control
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Solution Overview
Problem
Conventional fuel injection pumps with a single plunger are limited in adjusting fuel injection timing and volume, leading to incomplete combustion, inefficient fuel use, and increased harmful gas emissions, as they require expensive and difficult-to-control variable timing apparatuses and cannot produce diverse fuel injection patterns.
Innovation Solution
A fuel injection pump with two separable plungers, where the main plunger and a secondary plunger allow for independent adjustment of fuel injection timing and volume, enabling pre-injection and post-injection to enhance combustion efficiency and reduce emissions, with a spiral-shaped injection timing adjustment mechanism and preliminary fuel injection system for flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single plunger is used in the fuel injection pump, then the structure is simple, but the fuel injection timing and pattern cannot be adjusted flexibly
Solution Approach 1:
The single plunger is divided into two separate plungers: a main plunger and a preliminary plunger. Each plunger can be independently adjusted to control fuel injection timing and volume, enabling flexible fuel injection patterns (main injection and preliminary injection) without requiring a complex variable timing apparatus
2Ease of operation
If a variable fuel injection timing apparatus is added to adjust injection timing, then the fuel injection timing can be controlled, but the cost increases and control becomes difficult
Solution Approach 1:
Instead of adding a complex variable timing apparatus, the system segments the fuel injection function into two independent plungers with separate adjustment mechanisms. This allows timing control through simple mechanical adjustments of each plunger's position, avoiding the need for expensive and complex electronic control systems
Solution Approach 2:
The injection timing is controlled by changing the positional parameters of the plungers relative to the cam. By adjusting the installation positions of the main plunger and preliminary plunger on the cam, the timing of fuel injection can be precisely controlled without complex control apparatus
3Device complexity
If one plunger controls both fuel amount and injection timing, then the structure remains simple, but various fuel injection patterns cannot be formed
Solution Approach 1:
The single plunger is segmented into two independent plungers (main plunger and preliminary plunger), each capable of forming different injection patterns. The main plunger controls main injection while the preliminary plunger controls preliminary injection, enabling diverse fuel injection patterns without increasing overall structural complexity
Solution Approach 2:
Each plunger is designed with universal functionality to control both fuel amount and injection timing independently. The main plunger and preliminary plunger can be adjusted to create various injection patterns (main injection, preliminary injection, post-injection) suitable for different engine operating conditions
4Device complexity
If a single plunger is used for all engine load conditions, then the pump structure is simple, but optimal performance cannot be achieved across all load areas
Solution Approach 1:
The fuel injection function is segmented into main injection (main plunger) and preliminary injection (preliminary plunger), allowing independent optimization for different engine load conditions. The preliminary plunger can provide fine pre-injection for high-pressure warming up, while the main plunger handles main fuel injection, enabling optimal performance across all load areas
Solution Approach 2:
The system provides dynamic adaptability through independent adjustment of the two plungers. Each plunger can be adjusted to optimize fuel injection characteristics for different engine operating conditions, allowing the pump to adapt to varying engine loads and maintain optimal 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
The dual-plunger system allows for improved engine performance by enabling diverse fuel injection patterns, reducing fuel consumption, and decreasing harmful gas emissions through precise timing and volume control, making it easier to adjust fuel injection and maintain optimal engine performance across various load conditions.
Implementation Method 1
an elastic member having a lower portion elastically supported by the separable plunger and an upper portion inserted within the barrel to be supported by an upper surface of the barrel
Data Source
AI summary
A fuel injection pump having a separable plunger includes a separable plunger of which outer circumference is slide coupled to an inside of the a such that a lower portion thereof is supported by an upper portion of a main plunger to enable upward and downward slide movement in association with the main plunger, wherein an injection timing control spiral step of which upper surface is formed in a spiral shape, is protrudingly formed on the outer circumference thereof and a fuel passage is formed on one side of the outer circumference thereof including the injection timing control spiral step and an elastic member having a lower portion elastically supported by the separable plunger and an upper portion inserted within the barrel to be supported by an upper surface of the barrel.