Piston Engine Valve Controller Preventing Short Circuiting
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Solution Overview
Problem
Internal combustion piston engines suffer from short circuiting, where unburned fuel and fresh air are evacuated with exhaust by-products, reducing fuel efficiency, as existing technologies fail to completely separate intake and exhaust processes effectively.
Innovation Solution
The implementation of a valve controller system that manages the positioning of intake and exhaust valves to maintain optimal open positions for predetermined times, utilizing blocking members and shrouds to prevent short circuiting, allowing for efficient operation in both two-stroke and four-stroke modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional valve timing is used in piston engines, then the engine can operate in standard two-stroke or four-stroke modes, but short circuiting occurs where unburned fuel and fresh air are evacuated with exhaust by-products, reducing fuel efficiency
Solution Approach 1:
The patent applies dynamics by making the valve timing adjustable rather than fixed. The controller dynamically adjusts the opening and closing timing of intake and exhaust valves based on engine operating conditions, allowing optimization of valve overlap periods to prevent short circuiting while maintaining efficient fuel combustion and exhaust evacuation.
Solution Approach 2:
The patent changes the timing parameters of valve operation. By modifying the duration and timing of valve open positions, the system prevents the harmful short circuiting effect where fresh air and unburned fuel are evacuated with exhaust products, thereby improving fuel efficiency without compromising the engine's operational modes.
2Productivity
If valve overlap is increased to improve exhaust evacuation, then exhaust by-products are more completely removed from the combustion chamber, but unburned fuel and fresh air may be evacuated through the exhaust port causing short circuiting
Solution Approach 1:
The controller uses feedback from engine operating conditions to adjust valve timing. By monitoring parameters such as piston position, engine speed, and combustion state, the system optimizes the valve overlap period to ensure complete exhaust evacuation while preventing the evacuation of unburned fuel and fresh air, thus maintaining fuel efficiency.
Solution Approach 2:
The valve timing is dynamically adjusted based on real-time engine conditions. The controller modifies the opening and closing timing of valves to optimize the balance between exhaust evacuation efficiency and preventing short circuiting, allowing the system to adapt to varying operational requirements.
3Reliability
If the exhaust valve is kept open longer to ensure complete exhaust evacuation, then exhaust by-products are fully removed, but the intake valve may open during exhaust stroke causing fresh air to be evacuated through the exhaust port
Solution Approach 1:
The controller performs preliminary action by pre-positioning the intake valve to close before the exhaust valve closes. This timing sequence ensures that the intake valve is already closed when the exhaust valve opens, preventing fresh air from being evacuated through the exhaust port while maintaining complete exhaust evacuation.
Solution Approach 2:
The valve timing is dynamically optimized to prevent the harmful effect of fresh air evacuation. The controller adjusts the timing sequence of intake and exhaust valve operation to ensure that the intake valve closes before the exhaust valve opens, thereby preventing short circuiting while maintaining reliable exhaust evacuation.
Data Source
AI summary
A method of operating an internal combustion engine includes moving an exhaust valve to a first open position to enable an exhaust product to flow through an exhaust port of the internal combustion engine. The method also includes maintaining the exhaust valve at the first open position for a predetermined time period. The method also includes moving an intake valve to a second open position during the predetermined time period to enable an intake product to flow through an intake port of the internal combustion engine. Additionally, the method includes preventing at least a portion of the intake product from flowing through the exhaust port during the predetermined time period with a first blocking member and a second blocking member.