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FREILOT Workshop Brussels 22/04/2009
FREILOTWorkshop
Acceleration/Speed Limiter
Maria TevellVolvo Technology Corporation
FREILOT Workshop Brussels 22/04/2009
• 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
FREILOT Workshop Brussels 22/04/2009
• 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
FREILOT Workshop Brussels 22/04/2009
• 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
Proposed implementation
FREILOT Workshop Brussels 22/04/2009
• 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).
Proposed implementation
FREILOT Workshop Brussels 22/04/2009
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
FREILOT Workshop Brussels 22/04/2009
• 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
FREILOT Workshop Brussels 22/04/2009
Implementation leader: Maria TevellEmail: [email protected]: +33 472 964373
Application leader: Bruno DuchetEmail: [email protected] Phone: +33 472 969731
Contact details
FREILOT Workshop Brussels 22/04/2009
Speed limiter
FREILOT Workshop Brussels 22/04/2009
• 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
FREILOT Workshop Brussels 22/04/2009
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
Proposed implementation
FREILOT Workshop Brussels 22/04/2009
Depending on road profile or speed zone
Road profile Speed zone
Proposed implementation
FREILOT Workshop Brussels 22/04/2009
Proposed implementation
FREILOT Workshop Brussels 22/04/2009
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
FREILOT Workshop Brussels 22/04/2009
Implementation leader: Maria TevellEmail: [email protected]: +33 472 964373
Application leader: David ChandonEmail: [email protected] Phone: +33 472 962025
Contact details
FREILOT Workshop Brussels 22/04/2009
Back-up
FREILOT Workshop Brussels 22/04/2009
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