sachin kumar porandla advisor dr. wenzhong gao advisor 2.0 powertrain design group meeting #3

Sachin Kumar Porandla

Advisor

Dr. Wenzhong Gao

ADVISOR 2.0

POWERTRAIN DESIGN GROUP MEETING #3

of 14Intelligent Powertrain Design

Outline

• Need for simulation tools

• What is ADVISOR

• Working Principle

• ADVISOR GUI

• Simulation of HEV

• Limitations

• References


Need for Simulation tools

• Many configurations / energy management / control strategies

• Analytical solution is difficult

• Prototyping and testing is expensive & time consuming

• Optimization can be arduous task since there are literally hundreds of parameters affecting its performance


ADVISOR

• ADVISOR = Advanced VehIcle SimulatOR

-- simulates conventional, electric, hybrid (series, parallel, fuel cell) vehicles

• ADVISOR was created in 1994 to support DOE Hybrid program in NREL.

• Part of a larger system analysis effort from NREL and DOE

• Commercialized from 2002, available from AVL Powertrain Engineering Inc., Plymouth, Michigan.

• Downloaded by over 4000 people around the world


Advisor contd...

• ADVISOR operates in the MATLAB/Simulink environment -- Matlab is chosen for its programming ability, modeling flexibility,

optimization toolbox and visualization tools

• Graphical User Interface (GUI), allows the user to model any type of ICE/EV/HEV by easily changing the vehicle configuration and parameters without having to modify the Simulink block diagrams.

• Vehicle data is provided in Matlab files (m files) and models are developed in Simulink (calculations)

• Empirical model using drivetrain component performances


Advisor contd…

• Was the vehicle able to follow the speed trace? • How much fuel and/or electric energy were required in the

attempt? • How does the state-of-charge of the batteries fluctuate throughout

a cycle? • What were the peak powers delivered by the drivetrain

components? • What was the distribution of torques and speeds that the piston

engine delivered? • What was the average efficiency of the transmission?

• Predicts fuel economy, emissions, accel. performance and grade sustainability and optimization

ADVISOR will allow the user to answer questions like:


Working Principle

• Advisor is a backward facing model with limited forward facing capabilities

• In backward-facing calculations, no driver behavior is required. The user must input the driving pattern, a velocity profile, called the speed trace. The force required to accelerate the vehicle is calculated and translated into torque. This procedure is repeated at each stage from the vehicle/road interface through the transmission, drivetrain,etc., until the fuel use or energy use is calculated

• In forward-facing calculations, the user inputs the driver model, then the simulator generates throttle and brake commands that are changed into engine torque, which is passed to the transmission model and passed through the drivetrain until a tractive force is computed.


Principle contd…

HEV model

backward-facing model pass torque, speed, and power requirement up the drivetrain

forward-facing model pass available torque, speed,force and power through the drivetrain

represent model (data processing modules) contains all data processing elements, such as “Sum” and “Product” blocks and look-up tables, necessary to model


ADVISOR GUI

2

3

1

1. User can select his own vehicle configuration & components using drop- down menus user can modify variables in the variable list autosize: accel’n/grade constraints and optimizing drivetrain components

2. Graphical representation of the powertrain selected

3. Shows the performance information of the components (efficiency contours, emission contours and batteries


GUI contd…

autosize window

grade options

accel’n options


GUI contd…

1. User can select a drive- cycle/test procedure, no. of cycles etc. Declare initial conditions soc correction for HEV 2. Gradeability and accel’n requirements parametric analysis can be done

3. Views drive cycle selected and associated statistics/description

1

2

3


GUI contd…

1. Shows the fuel econ., gasoline equivalent and distance covered2. Emission data3. Accel’n and Gradeability4. Warnings: if the trace is not met or failed in performance criteria 5. Plot control6. Graphs: max. 4 plots

12

3

4

5

6Results Screen


Simulation of a Hybrid Electric vehicle

• A default parallel HEV is simulated. The parameters can be obtained by just inserting ‘parallel’ in ‘drivetrain config’menu box

• Objective is to minimize the engine size, meeting the constraints

Constraints0 – 60 mph <= 12 s40 – 60 mph <= 5.3s0 – 85 mph <= 23.4sdistance in 5 s >= 140 fttime in 0.25mi <= 20smax. accel. Rate >= 17 ft/s2max. speed >= 90mphgradeability = 6% at 55mph

Meets the constraints at 41 kW



meets constraints at 40 kW





Fails to meet the grade-constraints at 37 kW

Minimum size of engine for this config. Can be 38 kW


Limitations

• analysis tool, and not originally intended as a detailed design tool

• Component models are quasi-static, and cannot be used to predict phenomena with a time scale of less than a tenth of a second or so

• Physical vibrations, electric field oscillations and other dynamics cannot be captured using ADVISOR, however recent linkages with other tools such as Saber, Simplorer, and Sinda/Fluint allow a detailed study of these transients in those tools with the vehicle level impacts linked back into ADVISOR


References• Wipke, K., Cuddy, M., Burch, S., “ADVISOR 2.1: A User-Friendly Advanced Powertrain Simulation

Using a Combined Backward/Forward Approach,” IEEE Transactions on Vehicular Technology: Special Issue on Hybrid and Electric Vehicles. (8/99)

• Wipke K. et. al, “ADVISOR 2.0: A Second-Generation Advanced Vehicle Simulator for Systems Analysis,” NREL NAEVI ’98 paper presented in Phoenix, AZ. (12/98)

• ADVISOR 2002 documentation

• K. M. Stevens, “ A versatile computer model for the design of the design and analysis of electric and hybrid drivetrains,” Master’s thesis, Texas A&M Univ., 1996.

• J. Larminie and J. Lowry, “Electric vehicle technology explained,” John Wiley & Sons, Ltd., England, 2003

sachin kumar porandla advisor dr. wenzhong gao advisor 2.0 powertrain design group meeting #3

Documents