Torque Fluctuation Inhibiting Device with Variable Drag Mechanisms
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Solution Overview
Problem
Torque fluctuation inhibiting devices struggle to effectively manage torque fluctuations in vehicles with variable combustion orders, leading to reduced performance when more cylinders are deactivated, as existing designs are optimized for specific cylinder configurations.
Innovation Solution
A torque fluctuation inhibiting device featuring a mass body, drag mechanisms, and a restriction mechanism that generates a circumferential force to reduce relative displacement between a rotor and a mass body, allowing for adjustable actuation based on the number of deactivated cylinders, using centrifugal elements and cam mechanisms to convert centrifugal force into circumferential force, and restricting actuation to match combustion order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque fluctuation inhibiting device is designed with greatly fluctuating characteristics for actuating two cylinders, then torque fluctuations are inhibited when two cylinders are actuated, but torque fluctuations cannot be inhibited when four cylinders are actuated and performance may get worse
Solution Approach 1:
The patent applies the dynamics principle by making the number of actuated drag mechanisms variable rather than fixed. The restriction mechanism dynamically adjusts which drag mechanisms are active based on the combustion order, allowing the system to adapt its characteristics to match the current operating condition (2-cylinder or 4-cylinder mode), thereby resolving the contradiction between optimized performance for specific configurations and adaptability across configurations
Solution Approach 2:
The patent changes the parameter of the torque fluctuation inhibiting device by adjusting the number of actuated drag mechanisms according to the combustion order. This parameter change allows the device to optimize its torque fluctuation inhibition characteristics for different cylinder configurations, preventing performance degradation when switching between 2-cylinder and 4-cylinder operation modes
2Reliability
If all drag mechanisms are actuated to inhibit torque fluctuations, then torque fluctuations are reduced, but the device complexity increases
Solution Approach 1:
The patent applies partial action by actuating only the necessary number of drag mechanisms based on the combustion order rather than all drag mechanisms continuously. This partial actuation achieves sufficient torque fluctuation inhibition for each operating mode while reducing the overall complexity and resource requirements of the system
Solution Approach 2:
The restriction mechanism dynamically controls the actuation state of drag mechanisms, switching between different numbers of active mechanisms based on combustion order. This dynamic adjustment optimizes the balance between torque fluctuation inhibition performance and device complexity, activating only what is needed for the current operating condition
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 solution effectively inhibits torque fluctuations and vibrations across various combustion orders, improving vehicle stability and performance by adjusting the number of actuated drag mechanisms according to the number of deactivated cylinders, and optimizing torque fluctuation characteristics across a wide rotational speed range.
Implementation Method 1
a centrifugal force acts on each centrifugal element in rotation of the hub flange and the inertia ring
Implementation Method 2
Each cam mechanism includes a cam provided on the surface of each centrifugal element and a cam follower making contact with the cam
Data Source
AI summary
A torque fluctuation inhibiting device for inhibiting torque fluctuations in a rotor to which a torque is inputted is disclosed. The torque fluctuation inhibiting device comprises a mass body, a plurality of drag mechanisms, and a restriction mechanism. The mass body is disposed to be rotatable with the rotor and to be rotatable relative to the rotor. Each of the plurality of drag mechanisms is for generating a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction. The circumferential force is directed to reduce the relative displacement. The restriction mechanism is for restricting actuation of one or more of the plurality of drag mechanisms.