Hybrid Driving System for Human-Carried Work Machines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing human-carried work machines face limitations in achieving high output without the need for developing engines with increased displacement, which is time-consuming and costly.
Innovation Solution
The use of both an engine and an electric motor as prime movers, where the electric motor is integrated with the engine to enhance output without increasing engine size, allowing for a high-power work machine without extensive development time or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an engine with increased displacement is developed to improve output, then the output of the work machine is improved, but the development time and cost increase significantly
Solution Approach 1:
The patent combines an engine and an electric motor into a hybrid power system. The electric motor is integrated with the engine through a coupling mechanism that allows both power sources to work together, providing combined output without requiring the engine alone to be enlarged. This merging approach achieves high power output while avoiding the lengthy development process of designing a new large-displacement engine.
Solution Approach 2:
The electric motor in the hybrid system serves multiple functions: it can operate independently to provide power, work in conjunction with the engine to boost output, and potentially function as a generator during regenerative braking. This multi-functionality allows the system to achieve high output requirements without developing a specialized large-displacement engine.
2Power
If an engine with increased displacement is developed to improve output, then the output of the work machine is improved, but the development cost increases significantly
Solution Approach 1:
By merging an existing engine with an electric motor, the patent avoids the expensive development process of creating a new large-displacement engine. The electric motor can be integrated using standardized components and coupling mechanisms, significantly reducing development costs compared to designing and manufacturing a completely new engine platform.
Solution Approach 2:
The coupling mechanism acts as an intermediary between the engine and the driven load, allowing the electric motor to be integrated without requiring fundamental redesign of the engine or the driven components. This intermediary approach enables cost-effective integration by using standardized interfaces and control systems.
3Loss of time
If the engine size is kept identical to conventional engine, then the development time and cost are reduced, but the output of the work machine cannot be increased
Solution Approach 1:
The patent resolves this contradiction by merging the conventional engine with an electric motor. The engine maintains its original size and design, avoiding redevelopment, while the electric motor adds supplementary power. The combined output of both power sources achieves the desired high power level without increasing engine displacement or extending development time.
4Power
If both an engine and an electric motor are used as prime movers, then the output of the work machine is increased without increasing engine size, but the device complexity increases
Solution Approach 1:
The coupling mechanism serves as an intermediary that simplifies the integration of the electric motor with the engine system. It provides a standardized interface for power transmission and coordination, reducing the complexity that would otherwise arise from directly integrating two different power sources. The control system acts as another intermediary, managing the coordination between engine and motor through standardized control protocols.
Solution Approach 2:
The electric motor is designed with multi-functionality, serving as both a power source and potentially a generator. This reduces the need for separate components for different functions, thereby reducing overall system complexity despite having two power sources. The universal design allows the same component to perform multiple roles in the hybrid system.
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 configuration enables increased output in human-carried work machines without requiring large displacement engines, reducing development time and cost while improving efficiency and energy management through regenerative braking and energy storage.
Implementation Method 1
an electric motor is configured to apply torque to the output shaft of the engine
Implementation Method 2
improving efficiency and energy management through regenerative braking and energy storage
Data Source
AI summary
A human-carried work machine is provided with an engine and an electric motor as a prime mover for driving a tool. The engine includes an output shaft that is connected to the tool, and the electric motor is configured to apply torque to the output shaft of the engine. The electric motor is an outer rotor-type brushless motor and includes a rotor that is fixed to the output shaft of the engine and a stator core that is fixed to a crankcase of the engine. The rotor includes a peripheral wall that surrounds the stator core and a magnet is disposed on an inner surface of the peripheral wall.