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Technical Paper

Measuring Active Chassis System Performance in an HIL Environment

As the active chassis technology becomes more and more sophisticated, it becomes increasingly important to have a repeatable and objective environment for testing to accelerate the deployment of active chassis control systems. Track testing is a highly subjective and expensive method for testing and validation of active chassis control algorithms. It is often difficult to recreate a critical condition that a vehicle chassis experiences within its possible operation range during track testing. Therefore an environment with capability to create a critical condition in a repeatable and objective manner is highly desirable. This paper presents a repeatable and objective method for developing as well as measuring performance of active chassis systems.
Technical Paper

An Innovative Real Time Modeling, Simulation and Distributed Control Application

This paper presents a uniquely integrated environment where a control system is modeled, simulated and implemented in real time requiring no coding, no compiling nor embedding for multiple test rigs. The novel hardware architecture simultaneously configures itself according to the contents of a visual configuration editor (VCE) that is put together by the user utilizing graphical representations of basic building blocks called primitives. Similar to an analog computer, as the user builds the VCE model, the “code is simultaneously compiled and embedded” into the target DSP processor/s as easy as dragging and dropping primitives from various libraries into the VCE and connecting them. Similarly DSP processors within the hardware network are visually available to the user to be dropped into the VCE creating a distributed multi-processor control environment. The execution of multiple DSPs take place simultaneously reaching 25.6 kHz loop rates and 200 kz sampling rates.
Technical Paper

Track Simulation and Vehicle Characterization with 7 Post Testing

It is becoming a greater challenge to win a race as more and more technologies are put into use to enhance vehicle-handling characteristics. Vehicle handling during cornering and braking is one of the crucial performance characteristics that is continuously improved upon. To help the driver achieve the best handling performance on the track, suspensions are tuned to optimize for the specific track and racing conditions. Typically 4-post test rigs are used to test for the heave, pitch, roll and torsional frequencies of the suspensions. However three more actuators (aeroload actuators) become necessary to tune the suspensions at the correct ride height by including the aerodynamic effects. By means of a 7-post testing system an optimization procedure is executed to improve handling performance. An instrumented vehicle is driven on the track. The response of the vehicle is then replicated on a 7-post system using Iterative Control System (ICS) software.
Technical Paper

A Tool for Control Algorithm Development of an Active Vehicle Suspension Using Hardware-in-The-Loop

Vehicle ride comfort and handling demands conflicting design requirements from a vehicle suspension system. As a result, a passive vehicle suspension is incapable of providing the optimum performance for both ride and stability. A test set up is presented in this paper to enable a developer to test any given control algorithm on real-time hardware for an active vehicle suspension, and simulate quarter car performance characteristics. A quarter car model is developed in a host computer and then embedded in a target computer. The parameters of the quarter car are accessible for modification in host computer through TCP/IP connection with target computer. Ride and stability performance characteristics are calculated and also made available during HIL simulation. A controller including a DSP card works with a third computer, where the control system architecture can be edited and control parameters can be changed using a customizable graphical user interface.