Battery Motor Control for Gas Engine Replacement Efficiency
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Solution Overview
Problem
Conventional gas engines used in power equipment are inefficient, heavy, costly, and require frequent maintenance, with limitations in orientation and fluid management, while lacking the efficiency and flexibility of electric motor systems.
Innovation Solution
A gas-engine replacement device featuring a housing with a battery receptacle, a motor, a power take-off shaft, and an electronic processor that selectively controls power switching modes based on current measurements to optimize motor operation, enabling efficient and flexible power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If gas engines are used in power equipment, then power delivery is achieved, but weight increases and efficiency decreases
Solution Approach 1:
The patent replaces the internal combustion engine (mechanical system) with an electric motor system. The electric motor receives electrical energy from a battery pack and converts it to mechanical energy at the power take-off shaft, eliminating the need for fuel combustion, exhaust systems, and associated heavy components, thereby reducing overall device weight while improving energy efficiency.
Solution Approach 2:
The patent changes the energy source parameter from chemical energy (gasoline) to electrical energy (battery). This parameter change enables the use of lighter battery-powered electric motors instead of heavier internal combustion engines, while also improving energy efficiency through electronic control of the motor operation.
2Power
If gas engines are used in power equipment, then power delivery is achieved, but operational costs increase
Solution Approach 1:
The replacement of the internal combustion engine with an electric motor system eliminates ongoing operational costs associated with fuel purchase, engine maintenance, and exhaust system repairs. The electric motor system requires minimal maintenance while delivering equivalent or superior power output.
3Power
If gas engines are used in power equipment, then power delivery is achieved, but maintenance frequency increases
Solution Approach 1:
The electric motor system replaces the complex internal combustion engine with fewer moving parts, eliminating the need for regular maintenance of fuel injection systems, ignition systems, exhaust systems, and lubrication systems. This substitution dramatically reduces maintenance frequency while maintaining power delivery capability.
4Power
If gas engines are used in power equipment, then power delivery is achieved, but orientation flexibility is limited
Solution Approach 1:
The electric motor system eliminates the orientation constraints of internal combustion engines regarding fuel flow, exhaust drainage, and cooling system orientation. The electric motor can operate efficiently in any orientation, providing superior adaptability for applications requiring variable positioning or unconventional mounting configurations.
5Power
If conventional power switching modes are used in electric motors, then power delivery is achieved, but energy efficiency decreases at low currents
Solution Approach 1:
The patent implements dynamic switching between freewheeling mode and synchronous rectification mode based on real-time current measurements. The electronic processor monitors motor current and automatically selects the optimal power switching mode, enabling the system to adapt its operation to maintain high energy efficiency across varying load conditions while delivering required power.
Solution Approach 2:
The patent employs feedback control by continuously measuring motor current and using this information to determine the appropriate power switching mode. The electronic processor uses the current measurement feedback to switch between freewheeling mode (for higher currents) and synchronous rectification mode (for lower currents), optimizing energy efficiency dynamically.
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 provides a more efficient, lightweight, and cost-effective alternative to traditional gas engines, offering increased speed, reduced maintenance, and improved orientation flexibility, with enhanced temperature management and reduced vibration transfer.
Implementation Method 1
a motor located within the housing, a power take-off shaft receiving torque from the motor
Data Source
AI summary
Gas-engine replacement devices described herein include a housing that includes battery receptacle configured to removably receive a battery pack, a motor located within the housing, a power take-off shaft receiving torque from the motor and protruding from a side of the housing, a power switching network configured to selectively provide power from the battery pack to the motor, and an electronic processor. The electronic processor is coupled to the power switching network and configured to receive a current measurement associated with the motor and control the power switching network according to one of a freewheeling mode or a synchronous rectification mode based on the current measurement.