Vehicle Vibration Control Using Motor Back-EMF Signals
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Solution Overview
Problem
The existing active vibration noise control systems for vehicles have a complex configuration due to the use of vibration sensors on each wheel for obtaining reference signals, which complicates the setup.
Innovation Solution
The system utilizes an electric motor to change vehicle behavior and uses the inverse electromotive force information induced on the motor as a reference signal, simplifying the configuration for collecting the reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vibration sensors are fitted to suspensions on each wheel to obtain reference signals, then the system can control multiple kinds of vibration noises with different phases and intensities, but the configuration becomes relatively complicated
Solution Approach 1:
The electric motor is made to serve dual functions: primarily for driving the vehicle, and secondarily as a sensor for detecting vibration noises through inverse electromotive force. This eliminates the need for separate vibration sensors while maintaining the ability to detect multiple vibration sources, thereby reducing device complexity without sacrificing adaptability
Solution Approach 2:
The system uses the electric motor's own electrical characteristics (inverse electromotive force) to detect vibration noises, rather than requiring external sensing components. The motor essentially monitors itself, providing reference signals for noise control while continuing its primary driving function, thus simplifying the overall system configuration
2Measurement precision
If vibration sensors are fitted to each wheel suspension, then accurate reference signals can be obtained for noise control, but the system requires more components and becomes more complex
Solution Approach 1:
The electric motor serves as both the actuator and the sensor, using its own inverse electromotive force to generate reference signals for vibration noise detection. This self-monitoring capability eliminates the need for separate vibration sensors while maintaining measurement precision, thereby reducing the number of components without compromising reference signal quality
Solution Approach 2:
The inverse electromotive force of the electric motor acts as an intermediary that translates mechanical vibrations into electrical signals. This natural transduction mechanism provides accurate reference signals without requiring additional sensing hardware, thus maintaining measurement precision while simplifying the component structure
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 approach allows for a simpler configuration to obtain the reference signal, effectively reducing vibration noise levels, particularly in the frequency band between 50 Hz and 300 Hz, enhancing vehicle comfort.
Implementation Method 1
information on an inverse electromotive force induced on the electric motor by a behavior change of the vehicle
Data Source
AI summary
An active vibration noise control system is applied to a vehicle provided with an EPS motor to change behavior of the vehicle. The active vibration noise control system includes an ANC processor configured to receive acoustic information at a predetermined position in a vehicle compartment as an error signal and control a vibration noise based on a reference signal correlate with the vibration noise and the error signal that is received and an inverse electromotive force information receiving section receiving information on an inverse electromotive force induced on the EPS motor by behavior change of the vehicle. The ANC processor utilizes as a reference signal the information on the inverse electromotive force received by the inverse electromotive force information receiving section. The active vibration noise control system actively controls the vibration noise generated in the vehicle.