Electric Actuator Torque Control for Vehicle Stabilizer Resonance
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Solution Overview
Problem
Existing motor vehicle stabilizer arrangements with electric actuators experience resonance frequencies matching wheel oscillation frequencies, leading to uncomfortable control movements and forces, which existing solutions either require excessive power, increased weight, or data loss when attempting to mitigate.
Innovation Solution
Modifying the actuator torque by detecting and weighting actual signals from the actuator and wheel movements to adjust the stabilizer's spring rate and damping, allowing for comfortable driving without physical changes to the components, using a processor unit to determine nominal torque values and adapt system behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-efficiency gearing is used in the actuator, then torque transmission efficiency is improved, but resonance frequency increases to match wheel oscillation frequency causing uncomfortable control movements
Solution Approach 1:
The patent applies dynamics by making the stabilizer arrangement adaptable through electronic control. The actuator's torque is dynamically adjusted based on detected wheel oscillations and vehicle rolling movements. The control system modifies the torque signal in real-time to counteract resonance effects while maintaining efficient torque transmission through the gearing, thus resolving the contradiction between high efficiency and resonance-induced discomfort.
Solution Approach 2:
The patent changes parameters by modifying the torque signal characteristics through electronic processing. The control system alters the magnitude and timing of torque application based on detected oscillation frequencies and amplitudes. This parameter modification allows the system to operate efficiently at resonance frequencies while actively suppressing the harmful effects through adaptive control, rather than changing the mechanical gearing efficiency.
2Object-affected harmful factors
If low-efficiency gearing is used to dampen resonance, then resonance frequency problems are reduced, but a large amount of engine power is required and much wheel excitation is transmitted to the other side
Solution Approach 1:
The patent replaces the mechanical damping approach (low-efficiency gearing) with an electronic control system. Instead of using mechanical friction to dampen resonance, the system uses electronic signal processing and active torque control to suppress resonance frequencies. This substitution dramatically reduces engine power consumption because the electronic control can precisely target and counteract resonance without the continuous energy loss inherent in mechanical friction-based damping.
3Object-affected harmful factors
If the spring rate of the stabilizer is increased to change resonance behavior, then resonance frequency is shifted, but weight and space occupied increase
Solution Approach 1:
The patent replaces mechanical modification (increasing stabilizer cross-section to change spring rate) with electronic control. The system uses the existing stabilizer mechanics but actively modifies the torque application to change the effective resonance behavior. This electronic approach allows resonance frequency adjustment without any physical changes to the stabilizer components, thus avoiding increased weight and space requirements.
4Object-affected harmful factors
If high-pass filter is used to remove road signal components, then road-induced oscillations are filtered, but important data describing rolling behavior is lost
Solution Approach 1:
The patent applies local quality by selectively processing different frequency components of the detected signals. The control system identifies and targets specific frequency ranges corresponding to road-induced oscillations for suppression, while preserving other frequency components that contain important rolling behavior information. This selective filtering approach allows the system to remove harmful vibrations without losing valuable data about vehicle dynamics and rolling behavior.
Solution Approach 2:
The patent uses feedback by continuously detecting both wheel oscillations and vehicle rolling movements, then using this information to actively control the actuator torque. The system processes the detected signals to distinguish between harmful road-induced oscillations and informative rolling behavior data, applying corrective torque only to counteract the harmful components while maintaining awareness of overall vehicle dynamics through continuous feedback from sensors.
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 method effectively suppresses rolling movements, providing a comfortable driving experience by damping elastic deflections without abrupt torque increases, allowing for optimal adaptation of driving behavior and reducing resonance frequencies, thus enhancing passenger comfort.
Implementation Method 1
an actuator (5) having an electric motor for applying torque to the stabilizer sections (3a; 3b)
Implementation Method 2
the stabilizer sections execute torsional movement with respect to each other
Implementation Method 3
The weighting factor has the effect of damping the influence of the elastic deflection on the grand total of the actuator torque
Implementation Method 4
a wheel on one side is elastically deflected
Data Source
AI summary
Method for operating an adjustable stabilizer arrangement including an actuator, which applies actuator torque to stabilizer sections as a function of a command variable to influence the rolling movement of a motor vehicle body, where sensors are used to detect the movement of the motor vehicle body and the movements of the wheels. An operating condition of the actuator supplies a variable which can be used to determine the actuator torque, upon which is superimposed an adjustment signal for the actuator, and where the variable is modified by a weighting factor.