Multi-Axis Chassis Dynamometer Roll And Yaw Simulation
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Solution Overview
Problem
Conventional dynamometers are limited to single-axis motion simulation, which hinders the testing and evaluation of automated and connected automated vehicles that operate with reduced or no human input, necessitating improved systems for multi-axis motion simulation.
Innovation Solution
A chassis dynamometer system that supports vehicles with motorized rollers capable of rotating in both roll and yaw directions, allowing for simultaneous simulation of lateral and longitudinal dynamics, and includes a restraint system for vertical, lateral, and longitudinal motion, controlled by a controller that can switch between different evaluation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional single-axis dynamometers are used, then device complexity is reduced, but adaptability for testing automated vehicles is limited
Solution Approach 1:
The patent transitions from single-axis (longitudinal only) to multi-axis motion simulation by adding rotational mounts that enable lateral and vertical motion dimensions. This dimensional expansion allows comprehensive testing of automated vehicle dynamics including steering, suspension, and stability control without requiring multiple separate testing systems.
Solution Approach 2:
The dynamometer system is designed to perform multiple testing functions simultaneously - longitudinal motion, lateral motion, vertical motion - making it a universal testing platform for various automated vehicle scenarios. This multi-functionality replaces the need for multiple specialized single-axis dynamometers, improving adaptability while managing complexity through integrated design.
2Adaptability or versatility
If multi-axis motion simulation is implemented, then testing comprehensiveness is improved, but device complexity increases
Solution Approach 1:
The dynamometer system segments motion simulation into independent rotational mounts, each handling specific axes (longitudinal, lateral, vertical). This modular segmentation allows each component to be optimized independently while collectively providing comprehensive multi-axis simulation capability, managing overall system complexity through functional decomposition.
Solution Approach 2:
Multiple rotational mounts are merged into an integrated system where they operate concurrently to simulate complex vehicle dynamics. The merging of these motion simulation capabilities into a single unified platform achieves comprehensive testing capability while sharing common control and measurement infrastructure, thereby managing complexity through integration.
3Manufacturing precision
If concurrent rotation of rollers and rotational mounts is performed, then simulation accuracy is improved, but control complexity increases
Solution Approach 1:
The control system incorporates feedback mechanisms that monitor the actual motion of rollers and rotational mounts, comparing them against commanded positions. This feedback enables real-time adjustments to maintain synchronization and accuracy during concurrent rotation, managing control complexity through closed-loop control rather than open-loop coordination.
Solution Approach 2:
The system dynamically adjusts rotation speeds and positions of rollers and rotational mounts based on real-time testing requirements. This dynamic control allows accurate simulation of varying vehicle motion scenarios while managing control complexity through adaptive algorithms that respond to changing test conditions rather than requiring fixed pre-programmed sequences.
Data Source
AI summary
A dynamometer system may comprise motorized rollers disposed on motorized rotational mounts such that the dynamometer may simulate lateral motion as well as longitudinal motion of a vehicle under test. A dynamometer system may comprise at least one roller for supporting a vehicle tire. The roller may be supported by a turn table. The roller and the turn table may be coupled to direct-drive rotational motors. The roller and the turn table may be configured to rotate about perpendicular axis. The dynamometer may be operated in a variety of modes which may allow for at least one of or combinations of evaluation of lateral dynamics, longitudinal dynamics, or vertical dynamics of a vehicle under test. In this manner, more realistic evaluation of vehicle performance can be obtained in a controlled environment.