Variable Displacement Engine With Independent Valve Timing
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Solution Overview
Problem
Current combustion engines with fixed displacement struggle to meet emission and fuel efficiency standards while maintaining power output and reliability, leading to issues with drivability and engine wear due to higher rpm operation.
Innovation Solution
Implementing a combustion engine design with independent timing control for upper intake and exhaust valves in a non-combustion chamber, allowing for variable displacement and operation modes like full/partial displacement and Atkinson/Otto cycles, enabling larger engine parts for improved longevity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If small displacement engines are used to meet emission and fuel saving standards, then fuel efficiency and emissions are improved, but power output decreases leading to poor drivability
Solution Approach 1:
The engine employs variable valve timing mechanisms that dynamically adjust the timing of intake and exhaust valves based on operating conditions. This allows the engine to optimize performance across different loads and speeds, maintaining power output when needed while achieving fuel efficiency during steady-state operation
Solution Approach 2:
The system changes operational parameters including valve timing angles, lift durations, and displacement configurations to adapt between different operating modes. This enables the same engine to deliver both high power output and good fuel economy by adjusting parameters rather than being fixed in one configuration
2Power
If turbochargers and high gear ratios are used to compensate for low power output, then power output is improved, but engine wear increases due to higher rpm operation
Solution Approach 1:
The engine is divided into multiple independent combustion chambers, each with its own valve train and control system. This segmentation allows different chambers to operate at different displacements and timing configurations, enabling the engine to maintain lower average RPM while delivering required power through coordinated operation of multiple chambers
Solution Approach 2:
Each combustion chamber and its associated components are designed to perform multiple functions - they can operate independently or in coordination, at different power levels and efficiency modes. This multi-functionality allows the engine to achieve both power and durability by flexibly distributing the workload across chambers
3Loss of energy
If smaller bore and stroke sizes are used in small displacement engines, then fuel efficiency is improved, but power tolerance capacity and longevity decrease
Solution Approach 1:
Multiple combustion chambers with smaller individual bore and stroke sizes are merged to function as a single engine system. The combined displacement of multiple chambers provides the total engine displacement needed for fuel efficiency, while the coordinated operation of all chambers delivers the required power tolerance and durability equivalent to a single larger engine
Data Source
AI summary
A combustion engine comprises a main combustion cylinder configured to enable a piston to move therein; a main valve configured to move in the main combustion cylinder; an upper non-combustion chamber operatively adjacent to the main combustion cylinder; an upper intake valve configured to move in the upper non-combustion chamber and to communicate with an intake manifold; and an upper exhaust valve configured to move in the upper non-combustion chamber and to communicate with an exhaust manifold.