National Automotive Center

Committed to Excellence

Current Trends in Vehicle Driveline Modeling and Simulation

Richard Jacobson

Dan Kedziorek

National Automotive Center

Committed to Excellence

Introduction

• Driveline analysis is an important part of the vehicle design process

• The tool for driveline analysis depends on the application

• Several driveline analysis programs will be discussed with various levels of compelxity

• Make comparisons and help select the right tool

National Automotive Center

Committed to Excellence

Topics

• Description of a Vehicle Driveline

• Reasons for Driveline Simulation

• Descriptions of Selected Simulations

• Conclusions

National Automotive Center

Committed to Excellence

Description of a Vehicle DrivelineADVISOR2002 Driveline Diagram

National Automotive Center

Committed to Excellence

Reasons for Driveline Simulation

• Evaluate Vehicle Performance– Top Speed, Acceleration, Fuel consumption,

Cross-Country Speed (truck/SUV), Shifting, Emissions, Handling, Vibration

• Evaluate Vehicle Mobility– Top Speed, Acceleration, Fuel consumption,

Cross-Country Speed, Shifting, Emissions, Speed on Slopes, Obstacle Crossing

National Automotive Center

Committed to Excellence

Several simulations

• Propulsion System Performance Simulation (TARDEC in-house program)

• System for Computer Aided ANalysis (SCAAN) from Allison Transmission

• ADVISOR2002 National Renewable Energy Lab (NREL)• Ricardo Libraries for MSC Easy5 from RICARDO• GT-SUITE from Gamma Technologies• Powertrain Control Research Laboratory (PRCL)

University of Wisconsin-Madison

National Automotive Center

Committed to Excellence

Propulsion System Performance Simulation

• Developed at TARDEC

• Low Resolution

• Limited performance analysis– Acceleration– slope performance– fuel consumption

National Automotive Center

Committed to Excellence

ADVISOR2002

• High resolution

• Extensive input and output

• Graphical User Interface

• Customizable (built on MatLab)

• Detailed output

National Automotive Center

Committed to Excellence

ADVISOR2002 Example

National Automotive Center

Committed to Excellence

Easy5 Ricardo Libraries

• Many pre-built components

• Graphical User Interface

• Takes some work to learn

• Customizable (can link to MatLab)

• Extensive outputs

National Automotive Center

Committed to Excellence

RICARDO Libraries for Easy5 Example

National Automotive Center

Committed to Excellence

System for Computer Aided ANalysis SCAAN

• A service provided by Allison Transmission

• Low resolution

• Limited Performance Analysis– Acceleration– Slope performance

National Automotive Center

Committed to Excellence

Powertrain Control Research Laboratory

• Custom build simulations

• Has provided driveline simulations to the Army for the following:– HMMWV– M916/M870 – M1A1– M2A2

National Automotive Center

Committed to Excellence

Gamma Technologies GT-SUITE

• High resolution

• Highly detailed engine characteristics

• Graphical User Interface

• Can be coupled with CFD code and SIMULINK

• User code can be incorporated

National Automotive Center

Committed to Excellence

Conclusions

• Different levels of fidelity• Different things simulated• What does it all mean

– There are many different tools– Can help speed development of advanced drivelines

• Future Work – Increase use of Easy5 Ricardo Libraries– Advance the state of driveline simulation at TARDEC