Active Roll Stabilization Set-Point Limiting
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Solution Overview
Problem
Existing roll stabilizers lack a guarantee that the stabilizer motor operates within a defined working range of motor torque and running speed, leading to potential instability and failure.
Innovation Solution
A method and control device for a roll stabilizer that includes a stabilizer rod, housing, and motor, with a gear system and decoupling elements to ensure the motor operates within defined limits by setting and limiting set-point values for motor rotational angle and torque, preventing high torque and speed combinations that could cause instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stabilizer motor is controlled to counteract vehicle rolling without set-point limitation, then the roll stabilization effect is improved, but the motor may operate outside its defined working range causing instability and failure
Solution Approach 1:
The patent applies preliminary action by determining and limiting set-point values for motor rotational angle and torque before the motor executes the control action. The control device calculates the required motor rotational angle and torque to counteract rolling, then applies limitation logic to ensure these set-point values remain within the motor's safe working range before being sent to the motor controller. This preventive approach avoids operating conditions that could cause instability or failure.
Solution Approach 2:
The patent implements feedback by continuously monitoring the motor's actual rotational angle and torque, comparing these values against the limited set-point values, and adjusting the control output accordingly. The control device receives feedback signals from the motor and stabilizer rod position sensors, processes this information through the limitation logic, and dynamically adjusts the motor commands to maintain operation within the defined working range while achieving roll stabilization.
2Force
If the motor torque and running speed are allowed to increase simultaneously to improve stabilization performance, then the roll counteraction effect is enhanced, but the motor operates outside its defined working range
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the set-point values for motor rotational angle and torque based on the vehicle's rolling conditions. The control device calculates the required stabilization torque and corresponding motor rotational angle, then applies limitation logic that modifies these parameters to ensure they remain within the motor's safe operating envelope. This allows the system to utilize the motor's full capability while preventing operation in unsafe regions where high torque and high speed occur simultaneously.
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
Ensures the stabilizer motor operates within a stable range, reducing the risk of 'breakaway' or failure, thereby enhancing the positional stability and robustness of the roll stabilization system.
Implementation Method 1
Into the tubular connection is fitted a motor, which is controlled in such manner as to counteract the rolling of the vehicle by relative rotation between two stabilizer tubes
Implementation Method 2
A gear system can be fitted between the stabilizer motor and the stabilizer rod in order to transform the motor rotational speed into the rod rotational speed
Implementation Method 3
Due to the rigidity of the stabilizer rod, torsion is produced along the stabilizer rod which can be described by a torsion angle
Data Source
AI summary
A method for the active roll stabilization of a vehicle (50) by way of a roll stabilizer (30). The roll stabilizer (30) includes a stabilizer rod (32), a stabilizer housing (34) and a stabilizer motor (36), arranged inside the stabilizer housing (34), so that a first end of the stabilizer rod (32) is connected at to a wheel (52) of the vehicle and at a second end thereof is mounted to be rotated by way of the stabilizer motor (36). The method including the steps of obtaining a first set-point value of a rod torque of the stabilizer rod (32); obtaining a second set-point value of a motor rotation angle of the stabilizer motor (36); limiting the second set-point value based on an absolute value and/or a gradient of the first set-point value; and inputting the second set-point value into a control sequence (20) as a guide magnitude.