Multi-Axis Chassis Dynamometer for Lateral Vehicle Motion
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Solution Overview
Problem
Conventional dynamometers are limited to simulating motion in a single axis, which hinders the testing and evaluation of automated and connected 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 and rotational mounts, allowing for simultaneous simulation of lateral and longitudinal dynamics, including a controller to manage various modes of motion and interaction with automated drive systems.
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 insufficient
Solution Approach 1:
The patent transitions from single-axis (longitudinal only) to multi-axis motion simulation by adding rotational mounts that enable lateral motion. The roller assembly is mounted on rotational mounts that can rotate about a lateral axis, allowing the roller to move from longitudinal to lateral orientation, thereby enabling comprehensive testing of automated vehicle maneuverability in both longitudinal and lateral directions.
Solution Approach 2:
The dynamometer system is designed to perform multiple testing functions by combining longitudinal and lateral motion capabilities in a single system. The roller assembly can operate in longitudinal mode for acceleration testing and lateral mode for steering maneuverability testing, making the device universal for various automated vehicle performance evaluations.
2Adaptability or versatility
If multi-axis motion simulation is implemented, then adaptability for automated vehicle testing is improved, but device complexity increases
Solution Approach 1:
The system is divided into modular components: roller assemblies, rotational mounts, and a restraint system. Each roller assembly can be independently mounted on rotational mounts, allowing flexible configuration. The restraint system separately manages vehicle positioning and motion constraints, enabling independent optimization of each subsystem while achieving integrated multi-axis functionality.
3Adaptability or versatility
If lateral motion simulation is added, then maneuverability testing capability is improved, but restraint system complexity increases
Solution Approach 1:
The restraint system incorporates dynamic elements including rotational mounts that can rotate to accommodate lateral motion, and movable restraints that can constrain the vehicle chassis while allowing controlled lateral movement. The system dynamically adjusts between constraining the vehicle for longitudinal testing and allowing lateral motion for maneuverability testing, managing complexity through controlled adaptability.
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.