Straddled Vehicle Motor Crankshaft Stabilization
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Solution Overview
Problem
Existing straddled vehicle acceleration systems, such as those in motorcycles, face performance deterioration due to low crankshaft inertia and inefficient gas supply management, leading to delayed acceleration and reduced power output.
Innovation Solution
A straddled vehicle equipped with a single-cylinder engine, a permanent magnet type motor connected to the crankshaft, and a control device that assists piston operation by applying force promptly when the mixed gas supply increases, using a logical OR condition to trigger assistance based on throttle valve operation and rate of increase, ensuring high kinetic energy for gas compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the crankshaft inertia is reduced to improve acceleration response, then the acceleration response improves, but the crankshaft rotation speed becomes unstable and power output decreases
Solution Approach 1:
The control device performs preliminary action by detecting the rate of change in throttle valve opening degree and proactively determining to operate the permanent magnet type motor before the piston compression becomes problematic. This advance intervention allows the motor to apply force to the crankshaft in anticipation of the gas supply increase, preventing rotation speed instability before it occurs.
Solution Approach 2:
The permanent magnet type motor serves as an intermediary between the battery and the crankshaft system. It mediates the energy transfer by converting electrical energy to mechanical torque, which is then applied to the crankshaft to stabilize rotation speed. This intermediary component allows precise control of the force applied to maintain stability without directly modifying the crankshaft inertia.
2Stability of the object's composition
If the permanent magnet type motor operates continuously to stabilize crankshaft rotation, then rotation stability improves, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the permanent magnet type motor operation based on real-time throttle valve opening rate. The motor operates only when the rate of change exceeds a threshold value, making the stabilization action dynamic and conditional rather than continuous. This dynamic approach maintains rotation stability only when gas supply changes threaten stability, minimizing unnecessary energy consumption.
Solution Approach 2:
The control device monitors the rate of change parameter of the throttle valve opening degree and uses this parameter to trigger motor operation. By changing the operational state based on this parameter threshold, the system optimizes the balance between maintaining rotation stability and conserving battery energy, operating the motor only when parameter changes indicate potential instability.
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 enhances acceleration performance by promptly utilizing engine combustion power, stabilizing crankshaft rotation speed, and improving power output even with reduced crankshaft inertia, resulting in better acceleration and performance.
Implementation Method 1
a permanent magnet type motor including a rotor and a permanent magnet, the rotor connected directly or indirectly to the crankshaft so as to be rotatable in response to rotation of the crankshaft
Implementation Method 2
the piston moved to and fro by combustion of a mixed gas containing air and a fuel
Data Source
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AI summary
An engine unit includes a single-cylinder engine, a drive wheel, an acceleration command part, a throttle valve, a permanent magnet type motor, a battery, an inverter having switching parts, and a control device. The control device controls the plurality of switching parts so as to assist a piston operation by directing the permanent magnet type motor to apply a force to a piston via a crankshaft such that the force cooperates with a force generated by combustion in the single-cylinder engine to move the piston to and fro, the control triggered by the acceleration command part being displaced such that the degree of opening of the throttle valve is increased so as to satisfy at least one of a condition regarding the amount of operation on the acceleration command part and a condition regarding the rate of increase in the amount of operation on the acceleration command part.