Steering Wheel Vibration Control Using Active Cancellation
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Solution Overview
Problem
Existing vehicle vibration systems require multiple actuators, leading to high costs, and existing single-vibrator systems fail to clearly transmit information due to cross-vibration propagation.
Innovation Solution
A control device that utilizes a pair of vibration devices on a steering wheel, with one device canceling out the vibration of the other at a predetermined point to ensure clear information transmission, adjusting amplitude, phase, and frequency based on measurement data and driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple actuators are used for vibration transmission, then information transmission capability is improved, but device cost increases
Solution Approach 1:
The patent converts the harmful cross-vibration propagation into a beneficial effect by using active cancellation. The second vibration device generates vibrations that are opposite in phase to the unwanted vibrations from the first device, thereby canceling them out. This allows clear information transmission using only one primary actuator, avoiding the need for multiple actuators and reducing system cost while maintaining information transmission capability.
2Device complexity
If only one vibration device is used, then device cost is reduced, but information transmission clarity deteriorates due to cross-vibration propagation
Solution Approach 1:
The system applies preliminary anti-action by generating cancellation vibrations before the unwanted vibrations affect the information transmission. The control device calculates the vibration profile of the second vibration device in advance based on measurement data, ensuring that the cancellation vibrations are ready and synchronized to counteract the cross-vibration propagation, thereby maintaining information transmission clarity with a single primary actuator.
3Loss of information
If vibration cancellation is implemented, then information transmission clarity is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback by using measurement data from vibration sensors to continuously monitor the vibration state of the steering wheel. The control device processes this feedback information to calculate the appropriate vibration profile for the second vibration device, enabling dynamic adjustment of the cancellation vibrations to maintain optimal information transmission clarity under varying driving 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
Enables clear and cost-effective information transmission to vehicle occupants by canceling out unwanted vibrations, enhancing the clarity of directional vibrations for driving assistance and entertainment.
Implementation Method 1
the setting unit sets the profile so that a vibration at a predetermined point on the driving operator which is generated in association with the vibration of the second vibration device has the same intensity as the vibration intensity and an opposite phase to the phase
Data Source
AI summary
Provided is a control device for controlling vibrations generated by a vibration device group including at least a first vibration device and a second vibration device which are mounted on a driving operator of a vehicle, the control device including: a setting unit that sets a profile of vibration output by the second vibration device on the basis of measurement data related to vibration at a predetermined point on the driving operator which is generated in association with the vibration of the first vibration device; and a control unit that vibrates the second vibration device in accordance with the profile when vibrating the first vibration device.