Hydraulic Piston Engine Compression Ratio and Combustion Pressure Control
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Solution Overview
Problem
Existing engine designs face complexity issues when attempting to simultaneously change the compression ratio and suppress maximum combustion pressure, affecting both marine and vehicle engines.
Innovation Solution
An engine design incorporating a cylinder, piston, combustion chamber, sliding portion, hydraulic surface, hydraulic chamber, and auxiliary hydraulic chamber, with a communication mechanism that adjusts based on hydraulic pressure to control the top dead center position and manage combustion pressure, using a hydraulic pump and elastic member to balance pressures and volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both compression ratio change mechanism and maximum combustion pressure suppression mechanism are provided, then combustion control capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the compression ratio change mechanism and maximum combustion pressure suppression mechanism into a single integrated system. The hydraulic chamber serves dual purposes: it controls the top dead center position (affecting compression ratio) and simultaneously suppresses maximum combustion pressure through the auxiliary hydraulic chamber. This merging of functions reduces the number of separate mechanisms needed, thereby improving combustion control capability while limiting the increase in structural complexity.
Solution Approach 2:
The hydraulic chamber is designed to perform multiple functions: it acts as both a compression ratio control mechanism (by moving the top dead center position) and a maximum combustion pressure suppression mechanism (through communication with the auxiliary hydraulic chamber). This multi-functionality allows a single structure to address multiple combustion control needs, improving adaptability while avoiding the complexity of separate dedicated mechanisms.
2Object-affected harmful factors
If hydraulic chamber and auxiliary hydraulic chamber are communicated, then maximum combustion pressure suppression is improved, but device complexity increases
Solution Approach 1:
The auxiliary hydraulic chamber is integrated within or alongside the main hydraulic chamber, forming a nested configuration. The small-diameter hole provides a controlled communication path between the two chambers. This nesting approach allows the auxiliary chamber to function as part of the overall hydraulic system without requiring completely separate infrastructure, thereby improving maximum combustion pressure suppression while limiting the increase in hydraulic system complexity.
Solution Approach 2:
The small-diameter hole acts as an intermediary element that controls communication between the hydraulic chamber and auxiliary hydraulic chamber. This intermediary structure regulates the flow of hydraulic fluid between chambers, enabling effective maximum combustion pressure suppression through controlled pressure equalization, while keeping the hydraulic system complexity manageable through a simple, focused communication mechanism.
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
This design effectively suppresses the increase in structural complexity while controlling combustion pressure and compression ratio, reducing NOx emissions and maintaining thermal efficiency.
Implementation Method 1
an elastic member configured to press the partition piston from the accommodation chamber side toward the auxiliary hydraulic chamber side
Implementation Method 2
a hydraulic pump connected to the hydraulic chamber
Data Source
AI summary
Provided is an engine, including: a cylinder; a piston accommodated in the cylinder; a combustion chamber facing the piston; a sliding portion (large-diameter portion) configured to perform a stroke motion together with the piston; a hydraulic surface of the sliding portion facing a side opposite to the combustion chamber; a hydraulic chamber, which the hydraulic surface faces; and an auxiliary hydraulic chamber, which communicates with the hydraulic chamber, and has a volume changeable in accordance with a hydraulic pressure in the hydraulic chamber.