Browse Publications Technical Papers 2004-01-0711

Embedded System Development of an Electric Power Assisted Steering System Using MATLAB/SIMULINK/Real-Time Workshop 2004-01-0711

Electronic Control has been widely used in automotive systems, such as Vehicle Dynamics Control, Anti-Lock Braking Systems, Active Suspension and Steering System control, etc. The rapid prototyping development of an embedded controller for an electronic power assisted steering system (EPAS) will be presented in this paper. A steering model is established in MATLAB/SIMULINK to verify the proposed EPAS in this paper. This model includes the effects of kingpin inclination, caster, camber and lateral offset to calculate the total steering torque. The EPAS control strategy has considered the driver commands and vehicle speed to provide multiple stages of steering torque assistance. TMS320F240 DSP is used as the embedded controller of EPAS. EPAS Control algorithms have been designed using MATLAB/SIMULINK/Real-Time Workshop and Input/Output of Blocksets of TMS320F240 DSP have been developed in SIMULINK. Owing to the controller design, done by drag-and-drop blocks in SIMULINK, it can avoid the risk of hand-coding error. This process allows automotive engineers to develop EPAS control strategies easily under the GUI environment in SIMULINK. Auto-Code generation techniques are introduced to transform the SIMULINK model into ANSI C code. The machine code is loaded into TMS320F240 DSP after compiling the C code. TMS320F240 DSP would operate as a standalone embedded system for controlling the EPAS. This “Model to Chip” technique can greatly reduce the effort of control strategy development, and achieve the goal of rapid prototyping.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Development of Torque Controlled Active Steering with Improving the Vehicle Stability for Brushless EPS


View Details


Sliding-Mode Return Control of Electric Power Steering


View Details


Control-Oriented Model for Electric Power Steering System


View Details