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-to-air ratio.
Innovation Solution
A 4-stroke piston engine 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 across 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 conventional engines operate at reduced intake pressure which decreases efficiency
Solution Approach 1:
The patent implements a variable displacement mechanism that dynamically adjusts piston stroke length based on power demand. The wobble plate angle varies continuously to change displacement, allowing the engine to maintain optimal intake pressure across different operating conditions while improving fuel efficiency by matching displacement to actual power requirements.
Solution Approach 2:
The invention changes the geometric parameter of piston stroke length through wobble plate modulation. By varying the stroke length parameter while maintaining constant bore diameter, the engine achieves continuous displacement adjustment, enabling operation at full intake pressure across a wide range of power outputs and thereby maintaining maximum fuel efficiency.
2Use of energy by moving object
If engine displacement is continuously varied to optimize fuel efficiency, then compression ratio control becomes more complex
Solution Approach 1:
The patent employs a dynamic compression ratio control system where the wobble plate mechanism simultaneously adjusts both displacement and compression ratio. The variable geometry of the wobble plate allows coordinated variation of stroke length and compression ratio, maintaining optimal combustion conditions throughout the displacement range without requiring separate complex control systems.
3Use of energy by moving object
If multiple cylinders are inactivated to vary displacement, then fuel efficiency improves, but frictional losses are not reduced and control becomes more complex
Solution Approach 1:
The patent implements continuous variable displacement through wobble plate angle modulation, allowing smooth transition across the entire displacement range rather than discrete cylinder deactivation. This continuous adjustment enables optimal matching of engine output to power demand, improving fuel efficiency while maintaining operation of all cylinders to minimize frictional losses from frequent start-stop cycles.
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, reduces frictional losses, and allows for scalable and compact engine configurations, competing favorably with hybrid power trains in automotive applications.
Implementation Method 1
A 4-stroke piston engine with one or more cylinders arranged around a central straight power shaft... A piston control mechanism is linked to the power shaft at a variable angle with respect to the power shaft axis. The piston control mechanism transforms the forces from the piston(s) into torque to turn the power shaft.
Data Source
AI summary
A variable-displacement engine comprises an engine block, power shaft and rotating cylinder block. Pistons and connecting rods mounted in the cylinder block connect to 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 includes axial lift, control lever supported by the lift and by an anchor bearing, and links connecting the control lever to the wobble plate. Axial movement of the lift changes the axial position of the control lever pivot and changes the control lever angle, in turn changing, via the connecting links, the wobble plate angle θ and the axial position of the wobble plate pivot axis. This changes the piston displacement of the engine while maintaining substantially constant compression ratio.