Battery-less Engine System Recoil Starter Power Management
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Solution Overview
Problem
The existing methods for starting an internal combustion engine using a recoil starter require significant physical effort from the operator due to the need for a back-up battery, which increases manufacturing costs and operator load, and existing battery-less systems do not effectively manage power distribution during the starting phase.
Innovation Solution
A battery-less engine system that uses a control unit and power supply circuit to manage electric power generation and distribution from a generator, where power is only supplied to essential components like the ignition apparatus, injector, and fuel pump after the engine reaches a self-sustaining rotation threshold, reducing the load on the recoil operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a back-up battery is provided to supply electric power for the electronic fuel injection apparatus, then the engine can be started with sufficient electric power, but the manufacturing cost of the engine system increases
Solution Approach 1:
The patent extracts the back-up battery from the system and replaces it with a capacitor that charges during engine operation and discharges during starting. This removes the need for a separate back-up battery while maintaining sufficient electric power supply for the electronic fuel injection apparatus during engine start-up.
Solution Approach 2:
The system uses the engine's own generator to charge the capacitor during normal operation, and the capacitor automatically supplies power during starting. This self-service mechanism eliminates the need for external back-up power sources, reducing manufacturing cost while ensuring adequate power supply.
2Ease of manufacture
If only the power of a recoil operator is used without providing the back-up battery, then the manufacturing cost is reduced, but the operator is burdened with a heavy task and the engine cannot be started smoothly
Solution Approach 1:
The capacitor acts as an intermediary energy storage device between the generator and the electronic fuel injection apparatus. It accumulates energy during engine operation and releases it during starting, mediating the power supply to ensure smooth operation without requiring the operator to provide excessive mechanical power.
Solution Approach 2:
The capacitor charges in advance during engine operation before starting is needed. This preliminary energy accumulation ensures that when starting occurs, sufficient electric power is already available in the capacitor, eliminating the need for the operator to overcome heavy electrical loads and enabling smooth engine start-up.
3Reliability
If electric power is supplied to all components during the starting phase, then the engine can operate with all systems functional, but the recoil operator experiences excessive load
Solution Approach 1:
The patent applies local quality by providing electric power selectively to specific components (ignition apparatus and electronic fuel injection apparatus) during the starting phase rather than to all components. The capacitor supplies power locally where needed for reliable starting, while other non-essential components remain inactive, reducing the overall electrical load on the recoil operator.
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 approach reduces the physical effort required to start the engine by limiting power supply to these components until the engine can perform self-sustaining rotation, thereby alleviating the operator's load and maintaining efficient power usage.
Implementation Method 1
a generator 6 that is driven by the internal combustion engine 1 and generates electric power
Data Source
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AI summary
An engine system comprises a fuel tank, an internal combustion engine, a generator, a recoil starter, a control unit, an injector, a fuel pump, an ignition apparatus, and a detection unit that detects a number-of-rotations of the internal combustion engine. The control unit, in a starting period of the internal combustion engine using the recoil starter, determines whether or not the internal combustion engine can perform self-sustaining rotation based on the number-of-rotations, and if the internal combustion engine cannot perform self-sustaining rotation. Electric power is not supplied to the ignition apparatus, the injector, and the fuel pump when the internal combustion engine cannot perform self-sustaining rotation. The electric power is supplied to them when the internal combustion engine can perform self-sustaining rotation.