Vehicle Motion Control for Single-Peak Composite Acceleration
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Solution Overview
Problem
Existing vehicle motion control technologies do not adequately address the increase in composite acceleration peaks, leading to increased vibrations and unstable vehicle behavior, which compromises ride comfort and stability.
Innovation Solution
A vehicle motion control device that adjusts the relationship between longitudinal and lateral accelerations to ensure a single peak of composite acceleration during vehicle maneuvers, reducing the number of vibrations and stabilizing vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the peak value of composite acceleration is suppressed by reducing curvature peak values, then the stability of vehicle behavior is improved, but the number of acceleration peaks increases causing increased vibrations and reduced ride comfort
Solution Approach 1:
The patent changes the control parameters from only curvature peak value suppression to simultaneous control of acceleration peak value and the number of acceleration peaks. By monitoring the number of peaks in composite acceleration and adjusting the traveling track accordingly, the system resolves the contradiction between behavioral stability and vibration reduction.
Solution Approach 2:
The patent introduces feedback control by calculating the number of peaks in composite acceleration during vehicle operation and using this information to adjust the traveling track. This closed-loop approach ensures that both the peak acceleration values and the number of peaks are controlled, preventing excessive vibrations while maintaining stability.
2Stress or pressure
If the curvature of the traveling track is reduced to suppress peak acceleration, then the peak composite acceleration is lowered, but the vehicle requires longer time to complete maneuvers reducing productivity
Solution Approach 1:
The patent employs dynamic adjustment of the traveling track by selectively applying curvature reduction only in specific sections where acceleration peaks occur, rather than uniformly reducing curvature throughout the entire track. This dynamic approach maintains maneuver efficiency while suppressing peak accelerations where necessary.
Solution Approach 2:
The patent applies local quality by making curvature adjustments specific to certain sections of the traveling track rather than applying uniform curvature reduction. The system identifies and modifies only those track sections that generate excessive acceleration peaks, preserving overall maneuver performance while addressing local acceleration issues.
3Object-generated harmful factors
If the traveling track is modified to reduce acceleration peaks, then ride comfort is improved, but the complexity of the control system increases
Solution Approach 1:
The patent achieves multi-functionality by using a single control mechanism that simultaneously manages multiple objectives: suppressing peak acceleration values, controlling the number of acceleration peaks, and maintaining maneuver timing. This unified approach avoids the need for separate complex control systems for each objective.
Data Source
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AI summary
The present invention provides a vehicle motion control device capable of reducing vibration generated in a running vehicle and suppressing the occurrence of an unstable behavior of the vehicle. A vehicle motion control device that controls a motion of a vehicle includes an operation management unit that generates traveling status information of the vehicle, a traveling track generation unit that generates a traveling track of the vehicle based on the traveling status information, and a travel control unit that controls driving, braking, and steering of the vehicle based on the traveling track. The traveling track generation unit includes a course planning unit that generates a target course based on the traveling status information and a speed planning unit that plans a target speed by calculating a longitudinal acceleration and a lateral acceleration whose composite acceleration has one peak when the vehicle travels on each curve in the target course.