Steerable Chassis Dynamometer for Vehicle-in-the-Loop ADAS Testing
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Solution Overview
Problem
Conventional vehicle test benches cannot simulate steering behavior of vehicles during vehicle-in-the-loop (VIL) simulation, limiting the ability to test advanced driver assistance systems (ADAS) and autonomous driving (AD) technologies effectively.
Innovation Solution
A chassis dynamometer with independent steering of the front wheels, allowing longitudinal and lateral inputs, and a vehicle test bench that includes a chassis dynamometer, display, airflow, and temperature control devices to simulate various driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional linear rolling chassis dynamometer is used, then vehicle can be tested for longitudinal motion, but steering behavior cannot be simulated
Solution Approach 1:
The chassis dynamometer is divided into independent front wheel assembly and rear wheel assembly, each capable of independent rotation and positioning. The front wheel assembly can rotate around vertical axes to simulate steering, while the rear wheel assembly handles longitudinal motion, allowing steering behavior simulation without requiring complete redesign of the entire system
Solution Approach 2:
The front wheel hub assembly is made dynamically adjustable, allowing it to rotate around vertical axes through slewing motion. This dynamic capability enables the system to simulate various steering angles and steering behaviors during vehicle testing, transforming a static test bench into a dynamic simulation environment
2Reliability
If vehicle-in-the-loop simulation is implemented, then real vehicle can be tested in controlled environment, but conventional test benches cannot simulate steering
Solution Approach 1:
The chassis dynamometer is designed to perform multiple functions: it can simulate longitudinal motion, steering behavior, and various driving scenarios simultaneously. By integrating both longitudinal and lateral motion capabilities, the system becomes a universal test platform capable of validating ADAS and AD technologies across diverse driving conditions
Solution Approach 2:
The front wheel hub assembly is nested within the universal slide mechanism, allowing the wheel hub to rotate around vertical axes while the entire assembly remains constrained within the test bench framework. This nested structure enables steering simulation within the confines of the controlled test environment
3Measurement precision
If road tests are conducted to validate ADAS systems, then real-world performance can be assessed, but test costs and time are excessive
Solution Approach 1:
The chassis dynamometer creates a virtual copy of real-world driving scenarios by simulating steering behaviors, road conditions, and vehicle dynamics in a controlled environment. This virtual replication allows repeated testing of the same scenarios without the time and cost constraints of actual road tests, accelerating the validation process
Data Source
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AI summary
The present application discloses a chassis dynamometer for testing a vehicle, comprising: a front wheel test assembly; a rear wheel test assembly; a control device; the front wheel test assembly comprises: a front base frame; two universal slides, which are slidably arranged on the front base frame along a second direction perpendicular to a first direction and a vertical direction, and are configured to be able to rotate around a vertical direction; a front wheel hub bracket rotatably arranged on the universal slides; a slewing power-assisted drive device, which is fixed on the front wheel hub bracket and is configured to drive the front wheel hub bracket to rotate around a vertical direction. The present application also discloses a vehicle test bench including the chassis dynamometer and a method for simulating actual road driving of a vehicle.