FREILOT Workshop Brussels 22/04/2009 FREILOT Workshop Acceleration/Speed Limiter Maria Tevell Volvo...

FREILOT Workshop Brussels 22/04/2009

FREILOTWorkshop

Acceleration/Speed Limiter

Maria TevellVolvo Technology Corporation


• R&D work at Volvo has shown that 5% of fuel can be saved using the acceleration limiter • Test bench simulation of complete vehicle and journey• “Urban delivery cycle”

• In FREILOT we want to validate these results in real life conditions

Background


• The vehicle acceleration is limited to a certain level in order to optimize the fuel consumption in relation to mobility trade-off

• The function is tailor made to optimize a specific travel to be made by a specific truck

• Mobility targets will be defined by the customer in a graphical user interface used by fleet operator

Proposed implementation


• An acceleration limitation map and related parameters are adjusted using an off-board tool (I-Truck) which automatically calculates the optimized set-up of parameters

Customer interface

• Speed limitations

• Slopes

• Curves

• Stops

Vehicle model

3D maps Navteq Library

Desired route

& time to dest.

• Fuel consumption

• Expected time

• Predicted emissions

Plug-indata

extraction

Dataset Calibration

Acceleration Limiter Model

I-Truck



• The vehicle acceleration is leveled off by limiting the engine’s acceleration.

• The engine acceleration limit is taken from the engine map giving engine speed and total drive train ratio (expressed in mm the vehicle moves per engine revolution, calculated from gear ratio, K-factor and gearbox teeth).



Driver

Truck

Cargo HMI

VECU

RF

IDTGW+TTUEMS II

I-Truck for acc. calculation

Logger

WIP

Parking Booking

Driver coaching summary

Speed Zone

Fleet operator

Traffic Mangement

Intersection control

Data

Evaluation (CTAG)

Road Side Unit (RSU)

On board DCS

IC05

J1939-1

J1939-2/3

J1587z

Volvo architecture


• Implementation of the function in customers trucks in the field

• Final adaptation of the off-board I-Truck tool for use by real customers

• Legal implications of parameters tailoring

To discuss


Implementation leader: Maria TevellEmail: [email protected]: +33 472 964373

Application leader: Bruno DuchetEmail: [email protected] Phone: +33 472 969731

Contact details


Speed limiter


• Different pre studies have shown that management of the speed plan is one of the best potentials to achieve fuel consumption reduction. Within the Volvo group, several projects are on going to define the best balance between truck speed and trip time. One of them offer the possibility to control the speed of the truck depending of the road attributes : Adaptive Speed Limiter.

• R&D work indicates that 1% of fuel can be saved in urban driving each time the average speed is lowered of 1 km/h

•Volvo/Renault trucks see Acceleration/Speed limiter as an important tool for reducing fuel consumption

Background


The Telematic Gate Way hosts the ASL function

• The function can exchange data with the back office :• Vehicle position from GPS is sent• Localization in speed limited area is done by back office• Speed limit is decided and sent to the truck• Driver validates the instruction

• The truck rolls under a limited and controlled speed



Depending on road profile or speed zone

Road profile Speed zone



1. Final implementation of the function in the hardware of the truck2. Interest for customer for a system based on speed zone and back

office3. Back office and speed zone definition, (fleet, service provider, city)

4. Deployment issues, such as:• Is the system an after market solution or does it have to be

built in from the beginning into trucks?• How will we determine the price it would cost to purchase and

install the system?• How do we tackle security implications if max allowed vehicle

speed is sent via air?

To discuss


Implementation leader: Maria TevellEmail: [email protected]: +33 472 964373

Application leader: David ChandonEmail: [email protected] Phone: +33 472 962025

Contact details


Back-up


Fuel consumption with different speed limitation strategiesLyon - Grenoble

52,500

53,000

53,500

54,000

54,500

55,000

55,500

56,000

56,500

57,000

57,500

90,000 92,000 94,000 96,000 98,000 100,000 102,000time (min)

con

sum

ptio

n (l

)

No limitation with max speed of 90kmph

Speed limited at 85kmph always

Speed limited at 85kmph in injection phase

Speed limited at 80kmph always

Speed limited at 80kmph in injection phase

Speed plan management

FREILOT Workshop Brussels 22/04/2009 FREILOT Workshop Acceleration/Speed Limiter Maria Tevell Volvo...

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