Variable Inertia Flywheel Torque Ripple Compensation
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Solution Overview
Problem
Smaller, more efficient engines experience torque ripples at lower engine speeds, leading to increased stresses and vibrations, which conventional flywheel systems struggle to adaptively compensate for, resulting in poor vehicle drivability and performance degradation.
Innovation Solution
A torque ripple compensation device comprising an outer ring, an inner ring, and a linkage system that calculates and applies force to compensate for torque spikes by adjusting the amplitude and phase of the torque ripple, using a control system to optimize compensation and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a heavier flywheel is used to smooth rotational movement and retain speed, then torque ripple damping is improved, but vehicle response and precision control deteriorate
Solution Approach 1:
The patent employs a variable inertia flywheel system where the flywheel's moment of inertia can be dynamically adjusted during operation. By changing the radial position of mass elements along the flywheel's length, the system adapts the inertia to match operating conditions, providing high inertia for damping at low speeds and low inertia for rapid response at high speeds, thus resolving the contradiction between stability and response speed
Solution Approach 2:
The system changes the physical parameter of the flywheel's moment of inertia based on operating conditions. A control system monitors engine speed and load, then actuates mechanisms to move mass elements radially, adjusting the inertia parameter in real-time to optimize both torque ripple damping and vehicle response characteristics across different operating ranges
2Speed
If a lighter flywheel is used to improve acceleration response, then vehicle responsiveness is improved, but torque ripple damping capability deteriorates
Solution Approach 1:
The variable inertia flywheel system allows the flywheel to operate with low inertia during acceleration phases for rapid response, then transitions to high inertia during steady-state operation for optimal torque ripple damping. This dynamic adaptation resolves the contradiction by providing both light and heavy flywheel characteristics as needed
3Object-affected harmful factors
If conventional flywheel systems are used to compensate for torque ripples, then vibration reduction is improved, but adaptability to varying operating conditions deteriorates
Solution Approach 1:
The system dynamically adjusts the flywheel's moment of inertia based on real-time monitoring of engine operating conditions including speed, load, and torque ripple characteristics. This enables the system to adapt to varying conditions such as different driving cycles, engine loads, and speed ranges, maintaining optimal vibration reduction performance across all operating scenarios
Solution Approach 2:
A control system continuously monitors engine operating parameters and torque ripple levels, then provides feedback to actuate mechanisms that adjust the flywheel's inertia. This closed-loop feedback ensures the system automatically adapts to changing conditions, maintaining optimal vibration damping performance across diverse operating scenarios
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 device effectively reduces and cancels torque ripples, improving engine smoothness and vehicle performance by independently controlling amplitude and phase of torque spikes, reducing wear and stress on components, and maintaining performance across varying conditions.
Implementation Method 1
A first end portion of the linkage is connected a constraint and a second end portion of the linkage is connected to the inner ring and the outer ring of the torque ripple compensation device
Data Source
AI summary
A torque ripple compensation device for a motor vehicle. The device includes an outer ring, an inner ring and a linkage. A first end portion of the linkage is connected a constraint and a second end portion of the linkage is connected to the inner ring and the outer ring. A torque in a rotating shaft is compensated, reduced and/or canceled using the device by identifying a torque spike, calculating the amplitude and/or phase of the torque spike, comparing the amplitude and/or phase of the torque spike to a pre-determined torque profile, calculating the amount of amplitude and/or phase shift from the pre-determined torque profile, determining the amount of eccentricity and/or elliptical trajectory needed to compensate, reduce and/or cancel the amount of phase and/or amplitude shift, and applying a force to the first end portion of the linkage to compensate, reduce and/or cancel the phase and/or amplitude shift calculated.