Vehicle Drive Control Attenuation Filtering for Resonance Suppression
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Solution Overview
Problem
Existing vehicle drive control systems fail to effectively attenuate natural oscillation frequencies in torque transmission systems, leading to mechanical resonance and discomfort during vehicle operation, especially in hybrid vehicles where natural oscillations can vary due to aging or operational conditions.
Innovation Solution
A vehicle drive control system that includes a motor, rotational speed detector, accelerator opening degree detector, vehicle speed detector, torque instruction outputting device, attenuation filtering device, and controller, which performs attenuation filtering using a torque instruction notch filter and adjustment parameter calculating section to identify and adjust attenuation characteristics based on motor rotational speed and torque levels, thereby suppressing natural oscillation frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If attenuation filtering is applied to torque instruction to suppress natural oscillation frequencies, then mechanical resonance is reduced, but the system complexity increases due to additional filtering devices and control mechanisms
Solution Approach 1:
The patent introduces an attenuation filtering device as an intermediary component between the torque instruction output and the motor. This filter acts as a mediator that selectively attenuates natural oscillation frequency components of the torque instruction signal, thereby suppressing mechanical resonance in the torque transmission system without requiring fundamental changes to the existing control architecture
Solution Approach 2:
The system employs feedback mechanisms where the controller continuously monitors motor rotational speed and torque, and adjusts the attenuation filtering characteristics accordingly. The filter factors are dynamically calculated based on detected oscillation frequencies and fed back to the attenuation filtering device, enabling adaptive suppression of resonance while maintaining system stability
2Object-affected harmful factors
If filter factors are adjusted to suppress mechanical resonance, then vibration is reduced, but the ease of operation decreases due to complex filter factor calculation and adjustment requirements
Solution Approach 1:
The attenuation filtering device performs self-adjustment by automatically calculating optimal filter factors based on torque instruction values and motor operational parameters. The system monitors its own output and dynamically adjusts filtering characteristics without requiring external intervention or complex manual tuning, thereby reducing vibration while maintaining ease of operation
Solution Approach 2:
The system dynamically changes filter factors based on operating conditions such as motor rotational speed, torque levels, and detected oscillation frequencies. By adapting filtering parameters to current system state, the patent achieves effective vibration suppression across varying operational conditions without requiring complex manual adjustment mechanisms
3Object-affected harmful factors
If the attenuation filtering device identifies attenuation characteristics at low rotational speeds and high torque, then resonance suppression is improved, but the loss of time increases due to identification delays under specific conditions
Solution Approach 1:
The system performs preliminary identification of attenuation characteristics during specific operational windows (low rotational speed and high torque conditions) when the vehicle is likely to operate in the future. By pre-characterizing the resonance behavior under these conditions, the system prepares filtering parameters in advance, reducing identification delays when these conditions recur and improving overall resonance suppression responsiveness
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 system rapidly identifies and adjusts attenuation characteristics to suppress mechanical resonance, ensuring smooth vehicle operation by effectively attenuating natural oscillation frequencies, even as they vary due to aging or operational changes, thus preventing discomfort for occupants.
Implementation Method 1
The attenuation filtering device is configured to perform attenuation filtering to the torque instruction to attenuate a natural oscillation frequency component of a torque transmission system of the vehicle
Data Source
AI summary
A vehicle drive control system includes a motor, a rotational speed detector, an accelerator opening degree detector, a vehicle speed detector, a torque instruction outputting device, an attenuation filtering device, and a controller. The attenuation filtering device is configured to perform attenuation filtering to a torque instruction to attenuate a natural oscillation frequency component of a torque transmission system of a vehicle and configured to output a filtered torque instruction after the attenuation filtering. The attenuation filtering device is configured to identify an attenuation characteristic of the attenuation filtering if the rotational speed of the motor is smaller than or equal to a predetermined rotational speed and the torque of the motor is higher than or equal to a predetermined torque. The controller is configured to cause the motor to generate a torque corresponding to the filtered torque instruction.