Two-Stroke Engine Series Hybrid Power System for Working Machines
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Solution Overview
Problem
Working machines require a power source that is small, lightweight, and capable of long-term operation while meeting exhaust emission regulations, as traditional hybrid systems are too large and heavy for these constraints.
Innovation Solution
A series hybrid device utilizing a two-stroke engine with a fuel injection system and throttle control to optimize engine rotation speed, reduce noise and vibration, and improve thermal efficiency, allowing for efficient power generation and extended operation without increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a traditional hybrid system (engine + generator + motor + battery) is used to extend operating time, then the operating duration is improved, but the device becomes large and heavy
Solution Approach 1:
The patent extracts the generator and motor components from the traditional hybrid system, keeping only the battery and engine. The engine directly drives the working machine while the battery provides auxiliary power for high-load operations, eliminating the need for a separate generator-motor assembly and significantly reducing system weight and complexity
Solution Approach 2:
The engine serves multiple functions: it provides primary power for normal operations and also charges the battery during operation. The battery serves dual purposes by providing auxiliary power during high-load conditions and storing energy for later use, creating a multi-functional power system that extends operating time without proportionally increasing weight
2Duration of action of moving object
If a large capacity battery is mounted to extend working time, then the operating duration is improved, but the working machine becomes too heavy
Solution Approach 1:
The battery is pre-charged during engine operation before high-load tasks are performed. The engine charges the battery during normal operations, and the stored energy is then utilized during high-demand periods, allowing extended working time without requiring a large initial battery capacity that would increase machine weight
Solution Approach 2:
The system dynamically changes the power source configuration based on operational parameters. During normal operations, the engine provides power; during high-load conditions, the battery supplements power delivery. This parameter-based switching allows the use of a smaller battery capacity compared to a pure electric system, reducing weight while maintaining extended operational capability
3Object-generated harmful factors
If exhaust gas regulations are tightened to reduce emissions, then environmental compliance is improved, but the engine performance and simplicity are compromised
Solution Approach 1:
The fuel injection system delivers fuel in precisely controlled partial quantities based on operational requirements. During normal operation, standard fuel delivery maintains acceptable emissions. During high-load conditions, the system provides excessive fuel delivery through the battery-supplemented power mode, allowing the engine to operate at optimal fuel-air ratios for emissions control while meeting high power demands
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
The solution enables a lightweight, efficient power source for working machines that can operate for extended periods while maintaining measures against exhaust emissions, reducing fuel consumption and noise, and preventing oil leakage during tilting or falling.
Implementation Method 1
a fuel injection device disposed in the intake system including a crank chamber and injecting fuel into the intake system
Implementation Method 2
fuel injection device... injecting fuel into the intake system
Implementation Method 3
two-stroke engine... converting chemical energy from fuel combustion into mechanical energy
Implementation Method 4
a generator connected to the internal combustion engine... electric power generated by the generator
Implementation Method 5
a battery for storing electric power generated by the generator
Data Source
AI summary
A two-stroke engine (4) has a throttle motor (22) for driving a throttle valve (20), a fuel injection device (430) disposed in an intake system (18) including a crank chamber (420), and a control unit (24) controlling the throttle motor (22) and the fuel injection device. The two-stroke engine (4) is designed to achieve an engine rotation speed of 4,500 rpm to 7,000 rpm when the throttle valve (20) is fully open. The two-stroke engine (4) is operated with the throttle full open by the control unit (24), and a battery (8) is charged with electric power generated by a generator (6) using the two-stroke engine.