Active Suspension Roll Control for Lateral Acceleration Compensation
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Solution Overview
Problem
Existing methods for controlling vehicle roll angle focus primarily on safety by influencing lateral and yaw dynamics, neglecting comfort aspects such as reducing lateral acceleration for occupants, especially in semi-automatic or automatic driving scenarios.
Innovation Solution
A method that predicts future lateral acceleration using anticipatory longitudinal and lateral guidance, calculates the required vehicle roll to compensate for this acceleration, and controls actuators in active suspension or stabilizer systems to minimize phase delay and discomfort, incorporating variables like steering angle, vehicle speed, and road inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If model-based pre-control is used to apply compensating yaw moment, then driving stability is improved, but response time is delayed due to intervention only after deviation occurs
Solution Approach 1:
The patent applies preliminary action by calculating and compensating for lateral acceleration effects before the vehicle actually experiences them. The system uses predicted steering angle and vehicle speed to compute future lateral acceleration, then pre-adjusts the roll angle via suspension actuators to counteract the upcoming lateral forces, eliminating the delay inherent in reactive control systems.
2Reliability
If existing methods focus on safety by influencing lateral and yaw dynamics, then safety is improved, but comfort is worsened due to neglect of lateral acceleration reduction for occupants
Solution Approach 1:
The patent implements multi-functionality by enabling the active suspension system to simultaneously achieve safety-related roll stabilization and comfort-related lateral acceleration reduction. The control method calculates a target roll angle that satisfies both safety requirements (through roll angle limitation) and comfort requirements (through lateral acceleration compensation), allowing one system to fulfill multiple functions.
Data Source
AI summary
The method involves determining a variable influencing transversal acceleration from a function for a forecasting longitudinal and cross guide. A progress of the transversal acceleration is calculated based on vehicle models for forecasting time. Cross inclination of a vehicle is calculated for partial compensation of the progress of the transversal acceleration acting on passengers. Actuators are controlled such that the vehicle performs rolling movement corresponding to the cross inclination based on in-phase with the progress of the cross inclination during the forecasting time. USE : Method for controlling actuators that influence rolling movement of a motor vehicle, of an active suspension system or a system with an active stabilizer. ADVANTAGE : The actuators are controlled such that the vehicle performs the rolling movement corresponding to the cross inclination, thus increasing driving stability of the motor vehicle, and ensuring transversal acceleration-free automatic or semiautomatic driving of the motor vehicle for the passengers of the motor vehicle. DESCRIPTION OF DRAWINGS : The drawing shows a block diagram of a system for executing a method for controlling actuators.'(Drawing includes non-English language text)' 1, 2 : Control units 3 : Active body control actuating element.