Wobble Plate Variable Displacement Engine
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Solution Overview
Problem
Current internal combustion engines operate with constant displacement and compression ratio, limiting fuel efficiency and increasing frictional losses, especially when power demand varies, as they struggle to maintain optimal intake air pressure and fuel efficiency across different power settings.
Innovation Solution
A 4-stroke piston engine design with a wobble plate mechanism that allows continuous variation of piston displacement while maintaining a constant compression ratio, using a piston control linkage to adjust the wobble plate inclination angle in relation to the power shaft, enabling efficient fuel use over a wide range of power demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If engine displacement is reduced to lower power output, then fuel efficiency should improve, but intake air pressure drops and fuel efficiency deteriorates
Solution Approach 1:
The engine employs a wobble plate mechanism that dynamically adjusts the piston displacement stroke length while maintaining the same crankshaft rotation speed. This allows the engine to adapt its displacement continuously based on power demand, ensuring optimal intake air pressure is maintained even when operating at reduced power levels, thereby preserving fuel efficiency across the entire operating range.
Solution Approach 2:
The invention changes the geometric parameter of piston displacement by varying the wobble plate inclination angle. This parameter change allows the engine to maintain appropriate intake air pressure conditions for combustion while operating at different power outputs, resolving the contradiction between reduced displacement and maintained intake pressure.
2Device complexity
If constant displacement is used to maintain simple engine structure, then device complexity is low, but frictional losses increase and fuel efficiency decreases at reduced power demand
Solution Approach 1:
The wobble plate mechanism introduces dynamic adjustability to the engine displacement without requiring multiple engines or complex hybrid systems. The single wobble plate component enables continuous variation of piston stroke, allowing the engine to reduce displacement and corresponding frictional losses when operating at reduced power demand, while maintaining relatively simple overall structure.
3Adaptability or versatility
If displacement is varied by inactivating cylinders in multi-piston engines, then displacement changes in steps, but fuel efficiency over continuously variable range is limited and control becomes more complex
Solution Approach 1:
Instead of discrete cylinder deactivation, the wobble plate mechanism provides continuous displacement adjustment through smooth angular variation. This dynamic mechanism allows any displacement value within the range to be achieved continuously, improving adaptability while keeping control relatively simple through a single control parameter (wobble plate angle) rather than managing multiple cylinder states.
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 enhances fuel efficiency by maintaining full intake air pressure and optimal fuel use across varying power demands, reduces frictional losses, and allows for scalable and compact engine configurations, competing favorably with hybrid power trains.
Implementation Method 1
A 4-stroke piston engine design with a wobble plate mechanism that allows continuous variation of piston displacement while maintaining a constant compression ratio, using a piston control linkage to adjust the wobble plate inclination angle in relation to the power shaft
Data Source
AI summary
A variable-displacement engine comprises an engine block, cylinders and power shaft. Pistons and connecting rods mounted in the cylinders drive a wobble plate having a rotating ring portion and non-rotating ring portion connected to allow relative rotation therebetween while constraining the portions to remain parallel. The wobble plate defines an inclination plane, pivot axis and wobble plate angle θ. A piston control mechanism (PCM) includes a control yoke rotating with the power shaft and extending to an axially and radially fixed anchor line, a control shaft mounted on the yoke at the control line and a control arm extending from the rotating ring portion and defining a control slot captured over the control shaft. A lift mechanism changes the axial position of the pivot axis, in turn changing, via the PCM, the wobble plate angle θ. This changes the piston displacement of the engine while maintaining a predetermined compression ratio.