Electrically-Coupled Heat Engine Piston Control
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Solution Overview
Problem
Conventional heat engines rely on mechanical means for cyclic energy storage, which constrains piston motion and limits efficiency, reliability, and fuel versatility.
Innovation Solution
An electrically-coupled thermal cycle using electromagnetic drive and electronic control to manage piston motion, allowing for variable P-V cycle paths and efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical means (crankshaft with flywheel) are used for cyclic energy storage, then the system can store and return energy, but the piston motion is constrained and efficiency is limited
Solution Approach 1:
The patent replaces the mechanical crankshaft-flywheel system with an electrical energy storage device (capacitor or battery). The piston is directly coupled to an electrical circuit that stores energy electrically during the expansion stroke and returns it during the compression stroke, eliminating mechanical constraints on piston motion and enabling optimized thermal cycle paths for improved efficiency
Solution Approach 2:
The patent introduces an electrical circuit as an intermediary between the piston and the energy storage function. The piston moves a conductor through a magnetic field to generate electrical current during expansion, which is stored in a capacitor or battery, and then used to drive the piston during compression, serving as a flexible mediator that decouples energy storage from mechanical motion constraints
2Reliability
If mechanical means are used for cyclic energy storage, then energy can be stored and returned, but noise and vibration increase
Solution Approach 1:
The patent eliminates the mechanical crankshaft and flywheel system that generate noise and vibration by replacing it with an electrical energy storage system. The direct electrical coupling between the piston and energy storage device removes the mechanical transmission components that are primary sources of noise and vibration in conventional heat engines
3Device complexity
If conventional mechanical drive is used, then the system structure is simple, but adaptability to different fuels is limited
Solution Approach 1:
The patent implements dynamic control of the thermal cycle parameters through electronic control of the electrical circuit. The system can dynamically adjust the expansion and compression ratios, timing, and other parameters to optimize performance for different fuel types (hydrogen, natural gas, propane, gasoline, diesel), transforming a static mechanical system into a dynamically adaptable one
Solution Approach 2:
The patent enables changes in operational parameters (expansion ratio, compression ratio, cycle timing) through electrical control rather than fixed mechanical constraints. This allows the system to adapt its thermal cycle characteristics to match the specific properties of different fuels, improving fuel versatility without fundamentally changing the system structure
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
Enhances thermal cycle efficiency, reduces noise and vibration, and enables operation with various fuels by using electronic storage and direct electric drive of pistons.
Implementation Method 1
An electrical circuit is mounted stationary relative to the container, the electrical circuit being electromagnetically coupled to provide a motive force to the at least one piston
Implementation Method 2
The at least one piston is movably mounted such that its motion electromagnetically induces current in the electrical circuit
Data Source
AI summary
In accordance with an embodiment of the invention, there is provided a device for generating electrical energy using a thermal cycle of a working gas. The device comprises at least one piston movably mounted in a container to form a working chamber between the at least one piston and the container, the working chamber containing the working gas performing the thermal cycle. An electrical circuit is mounted stationary relative to the container, the electrical circuit being electromagnetically coupled to provide a motive force to the at least one piston. An electronic power converter is electrically connected to the electrical circuit and to an electrical bus, and an electrical storage device is electrically connected to the electrical bus. The at least one piston is movably mounted such that its motion electromagnetically induces current in the electrical circuit. An electronic controller is electronically connected to the electronic power converter to control motion of the at least one piston to perform, in the thermal cycle, at least one of: (i) expanding the working gas beyond the volume at which compression of the working gas is begun within the thermal cycle or (ii) exhausting the working gas to a remaining volume less than the smallest volume of compressed gas within the thermal cycle. The electronic controller further controls flow of electrical energy to and from the electrical bus to effect a net positive average power transfer from the working gas to the electrical bus over the course of the thermal cycle.