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OUTLINE Fundamental Power Requirements Single Regime IVT (Infinitely Variable Transmission) Perbury Multi-Regime IVT Engine Optimum Operating Line Typical Fuel Consumption Bath University/NREL Simulation Predictions for Perbury IVT Summary – How to increase MPG Conclusions

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OUTLINE

Fundamental Power Requirements

Single Regime IVT (Infinitely Variable Transmission)

Perbury Multi-Regime IVT

Engine Optimum Operating Line

Typical Fuel Consumption

Bath University/NREL Simulation

Predictions for Perbury IVT

Summary – How to increase MPG

Conclusions



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Engine Fuel Map and Vehicle Gearing

100

Maximum

Torque

40

Max

Power

80

240

34

250 g/kW.h

60

270

25

19 Mph/1000 rpm

Torque – lb ft

300

90

40

400

80

600

20

MPH

60

800

1000

30

0

1

3

2

4

5

Engine RPM – 000s





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Engine Fuel Map and Vehicle Gearing

100

Maximum

Torque

40

80

90

Max

Power

80

70

240

34

60

With efficiencies

250 g/kW.h

60

270

50

25

Optimum

Line

19 Mph/1000 rpm

Torque – lb ft

300

90

40

40

400

80

600

20

30

MPH

60

800

1000

30

0

1

3

2

4

5

Engine RPM – 000s



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Introduction to ADVISOR

ADVISOR, NREL’s ADvanced VehIcle SimulatOR, is a set of model, data, and script text files for use with Matlab and Simulink.  It is designed for quick analysis of the performance and fuel economy of conventional, electric, and hybrid vehicles.  ADVISOR also provides a backbone for the detailed simulation and analysis of user defined drivetrain components, a starting point of verified vehicle data and algorithms from which to take full advantage of the modeling flexibility of Simulink and analytic power of Matlab. ADVISOR was preliminarily written and used in November 1994.  Since then, it has been modified as necessary to help manage the US DOE Hybrid Vehicle Propulsion System subcontracts. Only in January 1998 was a concerted development effort undertaken to clean up and document ADVISOR.

Since then, researchers at

Chrysler Corp.

General Motors Corp.

AlliedSignal Automotive

Argonne National Laboratory

Naval Research Laboratory

University of California-Davis

University of Maryland

University of Illinois-Urbana/Champaign

and other research institutions have used ADVISOR to predict the performance of their vehicles, do studies on the effect of control strategy on emissions and fuel use, among other things.


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MPG vs Minimum Engine RPM

1500

1400

1300

1200

1100

Modified Min. Engine RPM

Minimum Engine Speed - RPM

1000

SC03

FTP

900

US06

800

HWFET

60

100

110

120

70

80

90

130

UK MPG


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Feasible

Used in the

simulation


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How to increase miles per gallon

Reduce engine speeds by high vehicle gearing

Keep to a chosen engine optimum line

but allow for transient departures

After attaining maximum overdrive,

bypass the rolling assembly

For a given transmission, select the final drive ratio

to suit the vehicle speeds during bypass

ONLY AN IVT CAN DO ALL THIS AND STILL BE

SMOOTHLY DRIVABLE


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Conclusions

Changing from fixed ratios to IV can indeed increase MPG

Simulation increases are approximately 20% better than the Honda Insight Hybrid and 30% better than the 5-speed manual

Even greater increases than this seem to be possible

An additional benefit - cars and traffic can be quieter as well