Vehicle Resonance Controller Torque Vibration Traction
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Solution Overview
Problem
Vehicles, especially those with independent front and rear wheels, face challenges in starting from rough roads due to resonance issues in transmission mechanisms, leading to reduced traction and increased vibration, which can prevent successful starting.
Innovation Solution
A control apparatus with a resonance controller and switcher that adjusts the transmission's resonance state between restraining and generating resonance, using torque commands to manage resonance frequency components and improve traction by adding vibration to the drive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resonance is restrained in the transmission mechanism, then vibration is reduced and normal operation is maintained, but the vehicle cannot generate sufficient traction to start from rough roads
Solution Approach 1:
The patent applies dynamics by making the resonance control state changeable based on driving conditions. The resonance controller dynamically switches between resonance-restraining and resonance-generating modes according to whether the vehicle is in normal operation or stuck on rough terrain, allowing the system to adapt its resonance characteristics to different operational requirements.
Solution Approach 2:
The patent changes the resonance parameter of the transmission mechanism by adjusting the torque command to include resonance frequency components when starting from rough roads. This parameter change allows the transmission to generate controlled resonance that increases traction, while maintaining normal resonance-restrained operation under typical conditions.
2Force
If resonance frequency components are added to increase traction, then the vehicle can start from rough roads, but the transmission mechanism experiences harmful resonance vibration
Solution Approach 1:
The patent converts the harmful resonance vibration into a beneficial force by deliberately generating controlled resonance frequency components in the torque command. The resonance that would normally be harmful is transformed into a useful vibration that increases traction and enables the vehicle to start from rough roads, effectively turning the transmission's natural frequency against itself in a beneficial way.
Solution Approach 2:
The system dynamically adjusts the resonance state based on detected driving conditions. When the vehicle is stuck on rough terrain, the resonance controller switches to generating resonance frequency components to increase traction. When normal operation is detected, it switches back to restraining resonance, allowing the same transmission mechanism to serve both purposes at different times.
3Reliability
If the resonance controller continuously restrains resonance, then the transmission operates smoothly, but the vehicle loses the ability to escape stuck situations on rough terrain
Solution Approach 1:
The resonance controller implements dynamic control by continuously monitoring driving conditions and switching between resonance-restraining and resonance-generating modes. This dynamic adaptation allows the transmission to maintain smooth operation during normal driving while becoming capable of generating beneficial resonance when the vehicle is stuck on rough terrain, thus achieving both reliability and adaptability.
Solution Approach 2:
The resonance controller is designed to perform multiple functions: it restrains resonance during normal operation to ensure smooth transmission performance, and generates resonance when the vehicle is stuck to improve starting capability. This multi-functionality allows a single control system to address both routine operation reliability and exceptional starting conditions.
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 enhances the vehicle's ability to start from rough surfaces by generating resonance to increase traction and reduce the likelihood of slipping, allowing the vehicle to escape stuck situations more effectively.
Implementation Method 1
The transmission mechanism has a natural frequency with respect to a vibration in a rotation direction of torque. Hence, the transmission mechanism resonates and thus generates a large vibration in the rotation direction of the torque when a resonance frequency component that is synchronized with the natural frequency is included in the power to be transmitted.
Data Source
AI summary
A control apparatus of a vehicle that is provided with a drive wheel, a drive unit configured to generate, on a basis of a torque command, power directed to running, and a power transmitter configured to transmit the power derived from the drive unit to the drive wheel. The control apparatus is mounted on the vehicle and includes a resonance controller and a resonance switcher. The resonance controller is configured to output the torque command, and control resonance of the power transmitter by utilizing the torque command. The resonance switcher is configured to switch a state of the resonance controller between a resonance-restraining state that restrains the resonance and a resonance-generating state that generates the resonance.