Variable-Position Fuel Injector for Cold-Start Fuel Distribution
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Solution Overview
Problem
Combustion engines experience delayed starting due to various factors, leading to issues like engine flooding and incomplete combustion, which can be exacerbated by engine type, injector dynamics, and environmental conditions.
Innovation Solution
A fuel injector that is moveable between two positions and angularly adjustable relative to the engine block, controlled by an actuator and a controller, allowing it to switch positions based on predetermined conditions such as speed, temperature, and throttle position, to optimize fuel delivery for efficient starting and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed position fuel injector is used, then the device structure is simple, but the engine starting is delayed and fuel distribution is suboptimal
Solution Approach 1:
The fuel injector is made dynamically positionable through a pivoting coupling member that allows angular adjustment between approximately 50 and 90 degrees. The actuator mechanism enables the injector to transition between a first position optimized for starting (directed toward the spark plug) and a second position for normal operation, converting a static component into a dynamic one that adapts to different engine states.
Solution Approach 2:
The fuel injection function is segmented into two distinct operational modes: a starting mode where fuel is directed toward the spark plug for reliable ignition, and a running mode where fuel is directed toward the piston for efficient combustion. The pivoting coupling member and actuator enable selective positioning to achieve these segmented functional requirements.
2Reliability
If fuel is injected in a single position, then the injection system is simple, but fuel distribution is suboptimal leading to incomplete combustion
Solution Approach 1:
The system dynamically adjusts the fuel injector position based on engine operating conditions. During starting, the injector pivots to direct fuel toward the spark plug for reliable ignition. During normal operation, it pivots to direct fuel toward the piston for efficient combustion, ensuring optimal fuel distribution for each operational phase.
Solution Approach 2:
Different fuel injection positions are provided for different operational requirements: one position optimizes fuel delivery for starting conditions (toward spark plug), while another position optimizes for running conditions (toward piston). This local optimization of fuel delivery ensures reliable combustion across all engine states.
3Adaptability or versatility
If the fuel injector position is fixed, then the manufacturing cost is low, but engine performance varies under different conditions
Solution Approach 1:
The fuel injector system transitions from a fixed position to a dynamically adjustable position through a pivoting coupling member actuated by an actuator mechanism. This enables the injector to adapt its angle between approximately 50 and 90 degrees based on engine operating conditions, providing versatility while maintaining a relatively simple mechanical implementation.
Solution Approach 2:
The fuel injector is designed to perform multiple functions by changing position: it delivers fuel optimally for starting conditions in one position and for running conditions in another position. The pivoting coupling member and actuator enable this multi-functionality, allowing a single injector to serve different operational requirements.
4Loss of time
If engine cycling occurs multiple times before combustion, then the starting process is cautious, but time and energy are wasted
Solution Approach 1:
The fuel injector is pre-positioned in the starting position (directed toward the spark plug) before the engine starts. This preliminary positioning ensures that fuel is delivered optimally for ignition from the outset, reducing the number of cycles needed to achieve sustained combustion and minimizing starting time and energy consumption.
Solution Approach 2:
The system dynamically switches the fuel injector position based on engine state. During the starting phase, the injector is positioned to direct fuel toward the spark plug for reliable ignition. Once the engine is running, it transitions to the running position, adapting to changing conditions to optimize performance and reduce unnecessary cycling.
Data Source
AI summary
A vehicle including a plurality of ground engaging members, a frame supported by the plurality of ground engaging members, a powertrain assembly supported by the frame and operably coupled to at least one of the ground engaging members, wherein the powertrain assembly includes an engine block defining a cylinder and a fuel injector positioned to provide fuel into the cylinder, wherein the fuel injector is moveable between a first position and a second position.