Two-Stroke Engine Valve Assembly with Electronic Position Feedback
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Solution Overview
Problem
In two-stroke internal combustion engines, coking deposits impede the movement of exhaust valves, leading to discrepancies in valve position, reduced engine performance, and uneven fuel consumption across cylinders, which affects torque, fuel economy, and rider comfort.
Innovation Solution
A movable valve assembly with a valve actuator system and position sensor, allowing for precise control of valve positions through a diaphragm-based pressure chamber and electronic control unit, ensuring consistent operation and reducing the impact of coking deposits by maintaining accurate valve alignment across multiple cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a movable valve is used to adjust exhaust port position, then engine performance can be optimized at different speeds, but coking deposits impede valve movement and cause position discrepancies
Solution Approach 1:
A position sensor is integrated into the valve assembly to detect the actual position of the valve and provide feedback to the control unit. This feedback mechanism allows the system to monitor valve position and compensate for any deviations caused by coking deposits, ensuring reliable valve operation across different engine speeds.
Solution Approach 2:
The patent replaces purely mechanical valve positioning with an electronically controlled system. The valve actuator receives control signals from the control unit, which adjusts valve position based on sensor feedback and engine operating conditions, reducing the impact of mechanical impediments from coking deposits.
2Productivity
If valve position is not accurately determined, then engine performance can still be maintained, but fuel consumption increases and rider comfort decreases
Solution Approach 1:
The position sensor provides continuous feedback on valve position to the control unit, enabling precise control of fuel injection and ignition timing. This ensures optimal engine operation across all speeds, minimizing fuel consumption and maintaining rider comfort by preventing energy losses from incorrect valve positioning.
3Object-affected harmful factors
If coking deposits accumulate on the valve, then valve movement is impeded, but the actual position becomes difficult to determine and adjust
Solution Approach 1:
The patent replaces mechanical measurement methods with electronic sensing. The position sensor electronically detects valve position, providing accurate readings even when coking deposits are present. This electronic detection system is less susceptible to interference from deposits compared to mechanical measurement methods, making valve position determination straightforward despite deposit accumulation.
Data Source
AI summary
A two-stroke internal combustion engine is disclosed having first and second cylinders having respective exhaust ports. A valve assembly comprises at least one valve actuator. First and second valves are operatively connected to the at least one valve actuator. The first and second valves are each movable between a first position wherein the valve extends a first distance in the respective exhaust port and a second position wherein the valve extends a second distance in the respective exhaust port. A valve connecting member is rigidly connected to the first and second valves and movable therewith via a translational motion while maintaining a substantially constant angular orientation relative to the cylinder block. A position sensor has a first portion connected to the cylinder block and a second portion connected to the valve connecting member. An electronic control unit (ECU) electrically connected to the position sensor.