Linear Actuator Fuel Pump Stroke Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel supply devices for internal combustion engines, particularly those driven by crankshafts, face challenges in adjusting fuel supply amounts without altering reciprocating cycle times, leading to fluctuations in pressure and flow rate, and increased risk of abnormal abrasion and seizure due to uneven load distribution.
Innovation Solution
A fuel supply device utilizing a linear actuator-driven reciprocating pump with a controller that adjusts the ratio of fuel ejection time to suction time by varying the stroke length and moving speed of the piston, allowing flexible fuel adjustment without changing the reciprocating time, and incorporating multiple fuel supply units to distribute load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reciprocating cycle of the reciprocating pump is changed to adjust fuel supply amount, then the fuel supply amount can be adjusted in accordance with engine load, but pressure and flow rate fluctuations occur leading to difficulty in achieving optimum flow rate
Solution Approach 1:
The patent applies dynamics by making the piston stroke length adjustable while maintaining a fixed reciprocating cycle. The controller dynamically changes the stroke length of the boosting piston based on engine load requirements, allowing flexible fuel supply adjustment without altering the cyclic operation pattern. This resolves the contradiction by enabling adaptability through stroke adjustment while preserving pressure and flow rate stability through maintained cycle consistency.
Solution Approach 2:
The patent changes the physical parameter of piston stroke length to adjust fuel supply amount. By varying the stroke length parameter while keeping the reciprocating cycle time constant, the system achieves flexible fuel control without introducing fluctuations in pressure and flow rate. This parameter change approach allows the fuel supply amount to be adjusted in accordance with engine load while maintaining stable operating conditions.
2Use of energy by moving object
If the reciprocating pump operates at low speed to reduce fuel consumption, then energy efficiency improves, but lubrication conditions of the joining rod deteriorate leading to abnormal abrasion and seizure
Solution Approach 1:
The patent applies dynamics by independently controlling the piston stroke length and reciprocating speed. The controller adjusts the stroke length to match engine load requirements while maintaining the reciprocating speed at a level that ensures proper lubrication. This dynamic adjustment allows the system to operate efficiently at various fuel consumption levels without compromising bearing lubrication conditions, thereby preventing abnormal abrasion and seizure.
Solution Approach 2:
The patent changes the stroke length parameter to adjust fuel supply while maintaining the reciprocating speed parameter at an optimal level for lubrication. By decoupling the control of stroke length and speed, the system can optimize fuel consumption through stroke adjustment while preserving reliability through maintained speed-based lubrication. This parameter separation resolves the contradiction between energy efficiency and bearing protection.
3Device complexity
If a crankshaft is used to drive the reciprocating pump, then the structure is simple and robust, but the piston stroke cannot be freely adjusted and individual pumps cannot be independently controlled
Solution Approach 1:
The patent replaces the mechanical crankshaft drive system with a linear actuator system controlled by a controller. This substitution eliminates the mechanical constraint of fixed piston stroke determined by crankshaft geometry, allowing free adjustment of stroke length. The linear actuator provides direct linear motion control that can be independently adjusted for each pump, enabling both stroke adjustment and independent control while maintaining structural simplicity through the use of standard linear actuator components.
Solution Approach 2:
The patent applies universality by using a linear actuator that can perform multiple functions: adjusting piston stroke length, controlling reciprocating speed, and enabling independent control of each pump. This single component replaces the multiple functions previously requiring separate mechanical adjustments, providing versatile control capabilities while maintaining relatively simple overall structure. The linear actuator serves as a multi-functional driver that addresses both stroke adjustment and independent pump control requirements.
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 flexible and efficient fuel supply adjustment according to engine load, reducing pressure and flow rate fluctuations, minimizing the risk of abrasion and seizure, and optimizing fuel distribution for improved engine performance.
Implementation Method 1
a linear actuator; a reciprocating pump having a boosting cylinder and a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction
Implementation Method 2
configured to boost and eject the fuel from the boosting cylinder when the boosting piston moves in a second direction in the axial direction
Data Source
AI summary
A fuel supply device includes: a linear actuator; a reciprocating pump having a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel when the boosting piston moves in a first direction and configured to boost and eject the fuel when the boosting piston moves in a second direction; and a controller configured to control driving of the linear actuator so as to adjust an amount of the fuel ejected from a boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine. The adjustment adjusts a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction.