Internal Combustion Engine Variable Stroke and Phase Control
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Solution Overview
Problem
Existing internal combustion engines lack the flexibility to adjust piston strokes and phases effectively, limiting their operational efficiency and adaptability to varying operating conditions.
Innovation Solution
The internal combustion engine incorporates a phase adjuster and a stroke adjuster, allowing for adjustable coupling between the eccentric shaft and crankshaft, enabling variable ratios of piston strokes and phases, which can be adapted based on operating states to optimize engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the internal combustion engine uses a fixed coupling between the eccentric shaft and crankshaft, then the engine structure is simple, but the engine cannot adapt to varying operating conditions and has limited operational efficiency
Solution Approach 1:
The patent applies the dynamics principle by making the coupling phase between the eccentric shaft and crankshaft adjustable rather than fixed. The phase adjuster mechanism allows the relative phase position to be dynamically changed according to operating conditions, enabling the engine to adapt between different cycle modes (Atkinson, inverted Atkinson, Otto cycles) while maintaining a relatively simple overall structure.
2Productivity
If the internal combustion engine uses a fixed piston stroke, then the engine structure is simple, but the engine cannot optimize performance across different operating states
Solution Approach 1:
The patent applies the parameter changes principle by enabling continuous adjustment of the piston stroke length through the stroke adjuster mechanism. This allows the compression ratio and expansion ratio to be varied as operating parameters, optimizing engine performance for different operating states such as partial load, full load, and transient conditions without requiring a completely complex reconfigurable structure.
3Loss of energy
If the internal combustion engine uses a fixed compression ratio and expansion ratio, then the engine is simple to operate, but the engine cannot achieve optimal efficiency across different operating conditions
Solution Approach 1:
The patent applies the feedback principle by implementing control systems that monitor operating conditions (such as load, speed, and temperature) and automatically adjust the phase and stroke parameters to optimize energy efficiency. The control unit receives feedback from sensors and modifies the phase adjuster and stroke adjuster positions accordingly, achieving optimal efficiency across different operating conditions while maintaining operational simplicity through automated control.
Data Source
AI summary
An internal combustion engine for a motor vehicle included a crankshaft, at least one piston coupled to the crankshaft for performing strokes in a cylinder as a consequence of a rotation of the crankshaft. An eccentric shaft is coupled to the crankshaft and to the piston in such a manner that through it strokes of the piston are extendable. The internal combustion engine further includes a phase adjuster for adjusting a phase of the coupling of the eccentric shaft to the crankshaft and/or a stroke adjuster for adjusting strokes of the piston, in particular an extension of strokes of the piston by the eccentric shaft.