V-twin Engine Cooling and Fuel System Design
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Solution Overview
Problem
Conventional V-twin internal combustion engines for outdoor power equipment face challenges in compact design, efficient cooling, and reduced emissions due to mechanical components that lead to increased size, noise, and fuel consumption.
Innovation Solution
The design incorporates a vertically-shafted two-cylinder engine with an electronic fuel system, dual-stage air filtration, and electric fans for efficient cooling, reducing the overall package size, improving emissions, and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical components are used in V-twin engines, then the engine can operate reliably, but the engine size increases and noise increases
Solution Approach 1:
The patent replaces conventional mechanical cooling fans with electric fans that are controlled by a controller. The electric fans are positioned to direct cooling air over the cylinder heads and are adjustable in speed based on engine operating conditions, eliminating the need for large mechanical fan structures while maintaining effective cooling.
Solution Approach 2:
The patent implements variable speed electric fans that can adjust their rotational speed based on engine temperature and operating conditions. The controller monitors engine parameters and adjusts fan speed accordingly, allowing the cooling system to adapt to different operating scenarios and reduce overall engine size while maintaining reliability.
2Temperature
If conventional mechanical cooling systems are used, then the engine can be cooled effectively, but the engine size increases
Solution Approach 1:
The patent replaces traditional mechanical cooling systems with an electrically-driven cooling system. Electric fans are used to generate cooling air flow, and the controller regulates fan operation based on temperature sensors, enabling effective cylinder cooling with a more compact design that reduces overall engine size.
Solution Approach 2:
The cooling system employs dynamically controllable electric fans whose speed and operation are adjusted in real-time based on engine temperature and loading conditions. This dynamic control allows the system to provide adequate cooling when needed while minimizing cooling components during low-demand periods, reducing overall engine size.
3Reliability
If mechanical fuel delivery systems are used, then the engine can deliver fuel reliably, but fuel consumption increases
Solution Approach 1:
The patent replaces conventional mechanical fuel delivery systems with electronic fuel injection. Fuel is delivered to the combustion chambers through electronically controlled injectors that receive signals from the controller, enabling precise fuel metering and optimization of the air-fuel mixture to reduce fuel consumption while maintaining reliable fuel delivery.
Solution Approach 2:
The electronic fuel injection system incorporates feedback control where the controller monitors engine operating parameters and adjusts fuel delivery accordingly. This closed-loop system optimizes fuel consumption by adapting the air-fuel mixture to actual engine conditions, reducing waste and improving efficiency while maintaining reliable fuel delivery.
4Device complexity
If single-stage air filtration is used, then the air filter is simpler and smaller, but emissions increase
Solution Approach 1:
The patent implements a dual-stage air filtration system where the first stage filters out larger particles and the second stage filters out smaller particles. This segmented approach separates the filtration function into two distinct stages, improving emissions control while keeping each individual filter element relatively simple and manageable.
Solution Approach 2:
The dual-stage filtration system adds an additional dimension to air purification by introducing a second filtration barrier. The first stage handles coarse particles while the second stage addresses fine particles, creating a hierarchical filtration structure that reduces emissions more effectively than a single-stage system without proportionally increasing overall complexity.
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 solution results in a more compact engine with improved power output, reduced fuel consumption, and lower emissions, along with better temperature control and sound quality compared to traditional V-twin engines.
Implementation Method 1
an air filter assembly configured to filter incoming air from an air intake and provide cleaned air to a throttle body
Implementation Method 2
The first electric fan is coupled to a first duct. The first duct is configured to direct cooling air directly over the first cylinder.
Data Source
AI summary
One embodiment of the invention relates to an internal combustion engine including an engine block having a first cylinder and a second cylinder, a crankshaft configured to rotate about a crankshaft axis, a flywheel coupled to the crankshaft, a throttle body, an air filter assembly, a first electric fan coupled to a first duct, and a second electric fan coupled to a second duct. The first duct is configured to direct cooling air directly over the first cylinder. The second duct is configured to direct cooling air directly over the second cylinder. The first cylinder is at least partially within the first duct. The second cylinder is at least partially within the second duct.