Torque Ripple Compensating Device Using Variable Inertia
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Solution Overview
Problem
Conventional torque ripple compensating devices for internal combustion engines are inadequate in adapting to varying amplitudes and phases of torque ripple, particularly at different operating speeds, and often compromise engine responsiveness due to the weight and design limitations of flywheels used for damping.
Innovation Solution
A torque ripple compensating device utilizing a Cardan joint assembly with a flywheel and an adjustable angular deviation mechanism, allowing for cyclical acceleration and torque application to the engine output, which can be dynamically or passively adjusted to minimize interference and optimize performance across different operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavier flywheel is used to dampen torque ripple, then torque ripple compensation is improved, but engine responsiveness deteriorates
Solution Approach 1:
The system divides the flywheel mass into two separate rotors (first rotor and second rotor) that can independently control their moments of inertia. This segmentation allows each rotor to be optimized for different functions: one for torque ripple compensation and another for maintaining engine responsiveness, resolving the contradiction between heavy mass for damping and light mass for responsiveness.
Solution Approach 2:
The system dynamically adjusts the moment of inertia of each rotor based on operating conditions through variable inertia mechanisms. This allows the flywheel system to adapt its characteristics in real-time, providing heavy effective mass for torque ripple compensation when needed while maintaining light effective mass for engine responsiveness during acceleration, thus resolving the static contradiction.
2Object-affected harmful factors
If a conventional flywheel is used for torque ripple compensation, then vibration damping is improved, but adaptability to varying operating conditions deteriorates
Solution Approach 1:
The system employs variable inertia mechanisms in each rotor that allow dynamic adjustment of moment of inertia based on operating conditions such as engine speed and load. This transforms a static flywheel into a dynamic system that adapts its damping characteristics to varying torque ripple conditions, resolving the contradiction between effective vibration damping and adaptability.
Solution Approach 2:
The system changes the physical parameter of moment of inertia in response to varying operating conditions. By adjusting the moment of inertia parameter dynamically, the system maintains optimal torque ripple compensation across different operating regimes, resolving the contradiction between effective damping at specific conditions and adaptability across varying conditions.
3Object-affected harmful factors
If the moment of inertia of the flywheel is increased, then torque ripple dampening is improved, but device complexity increases
Solution Approach 1:
Instead of using a single complex heavy flywheel, the system segments the inertia into two separate rotors with variable inertia mechanisms. This segmentation allows for more compact design and distributes the complexity across manageable components, reducing overall device complexity while maintaining or improving torque ripple dampening effectiveness.
Solution Approach 2:
The system replaces the conventional mechanical flywheel with a more sophisticated arrangement of two rotors with variable inertia mechanisms. This substitution allows for electronic or sensor-based control of the moment of inertia, reducing the need for overly complex mechanical structures and enabling more efficient torque ripple compensation.
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 effectively compensates for torque ripple by applying a second-order torque to dampen engine vibrations, improving drivability and reducing wear on components while maintaining engine responsiveness and adaptability across a range of operating speeds.
Implementation Method 1
A torque ripple compensating device utilizing a Cardan joint assembly with a flywheel and an adjustable angular deviation mechanism
Implementation Method 2
The cyclical acceleration of the third member applies a torque to the output of the internal combustion engine through the first member
Data Source
AI summary
A torque ripple compensating device for an internal combustion engine is provided. The torque ripple compensating device comprises a first member, a second member, and a third member. The first member is in driving engagement with an output of the internal combustion engine. The second member is in driving engagement with the first member. The third member is in driving engagement with the second member. An angular deviation between the first member and the third member causes a cyclical acceleration of the third member. The cyclical acceleration of the third member applies a torque to the output of the internal combustion engine through the first member. The torque ripple compensating device is able to be passively or dynamically adapted for both an amplitude and a phase of a torque ripple while minimizing an interference with an operation of the internal combustion engine.