Overrunable Test Vehicle Torque Vectoring for ADAS Crash Simulation
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Solution Overview
Problem
Current testing equipment for Advanced Driver Assistant Systems (ADAS) lacks the capability to simulate realistic crash scenarios without risking damage to the vehicle, as existing soft targets and mobile platforms are not designed to withstand the rigors of high-speed impacts and varied testing conditions.
Innovation Solution
An overrunable test vehicle equipped with a chassis, electric motors, and a control system that calculates torque and speed outputs to rotate the vehicle about an axis, allowing it to maneuver and simulate various crash scenarios while carrying soft targets, thereby enhancing the testing of ADAS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If soft targets are used for ADAS testing, then damage to the testing vehicle is reduced, but the ability to simulate realistic crash scenarios and withstand high-speed impacts is compromised
Solution Approach 1:
The test vehicle is divided into separate functional components: a resilient chassis that withstands impacts, a separate soft target payload that protects the testing vehicle, and independent drive mechanisms for each wheel. This segmentation allows each component to be optimized for its specific function - the chassis for durability, the soft target for protection, and the drive mechanisms for maneuverability.
Solution Approach 2:
The soft target acts as an intermediary between the testing vehicle and the test environment. It absorbs and dissipates impact forces before they reach the testing vehicle, serving as a protective buffer that enables realistic crash scenario testing without damaging the expensive ADAS-equipped vehicle.
2Device complexity
If traditional mobile platforms are used, then simplicity is maintained, but the ability to dynamically maneuver and rotate during testing is limited
Solution Approach 1:
The test vehicle employs dynamically controllable drive mechanisms with independent electric motors on each wheel, allowing real-time adjustment of speed and torque. The control system continuously calculates required motor parameters to achieve desired trajectory and rotation, enabling adaptive maneuvering during testing rather than fixed pre-programmed paths.
Solution Approach 2:
The vehicle controls its motion by dynamically changing motor parameters - specifically torque and speed outputs - based on real-time calculations. The control system adjusts these parameters to achieve precise trajectory control and rotation about a defined axis, allowing versatile testing scenarios without mechanical reconfiguration.
3Ease of operation
If independent electric motors are used on each wheel, then precise control of trajectory and rotation is achieved, but device complexity increases
Solution Approach 1:
The control system implements closed-loop feedback by continuously monitoring the vehicle's position and orientation, calculating the difference between current and target states, and adjusting motor parameters accordingly. This feedback mechanism enables precise trajectory and rotation control despite the complexity of four independently controlled motors.
Solution Approach 2:
The electric motors serve multiple functions: propulsion forward and backward, steering by differential torque application, and rotation about a vertical axis by coordinating torque across all four wheels. This multi-functionality reduces the need for separate mechanical steering and rotation mechanisms, offsetting some of the control complexity.
Data Source
AI summary
The present teachings generally provide for an overrunable test vehicle for dynamic vehicle testing of advanced driver assistant systems along a driving plane. The overrunable test vehicle comprising a chassis with a first end and a second end and including a mounting area configured to receive a soft target, and defining an axis of rotation transverse to the driving plane between the first end and the second end, four drive mechanisms coupled with the chassis, each drive mechanism having an electric motor with a drive wheel, and a control system coupled with the electric motors, and configured to control speed and torque of each of the electric motors, forming a torque vector that rotates the overrunable test vehicle about the axis of rotation to a target rotation angle. The axis of rotation is a location between the two drive mechanisms that the chassis turns about when the torque vector is applied to the chassis of the overrunable test vehicle.