1. Acceleration/Speed Limiter Maria Tevell Volvo Technology Corporation
FREILOT Workshop
Acceleration/Speed Limiter
Maria Tevell
Volvo Technology Corporation

2. Background
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
Objective of this slide: Present WHY do we want to do this
e.g. R&D work at Volvo has shown that XX % of fuel, while driving in urban areas, can be saved by applying an acceleration limiter… etc… In FREILOT we are interested to taking this work further and have real-life tests with our clients…
5% on Urban delivery cycle (measured on "BMSVI" engine test bench that simulate a complete vehicle and journey)

3. Proposed implementation
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
Objective of this slide: Present HOW do we want to do this (This can actually be few slides!)
e.g. these ECU’s will be updated, there will be a screen in the truck showing, safety arrangements, etc…

4. Plug-in data extraction
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
Acceleration Limiter Model
Dataset Calibration
I-Truck
Fuel consumption
Expected time
Predicted emissions
Speed limitations
Slopes
Curves
Stops
Vehicle model
Desired route
& time to dest.
Objective of this slide: Present HOW do we want to do this (This can actually be few slides!)
e.g. these ECU’s will be updated, there will be a screen in the truck showing, safety arrangements, etc…
Plug-in data extraction
Customer interface
3D maps Navteq Library 4

5. Proposed implementation
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).
Objective of this slide: Present HOW do we want to do this (This can actually be few slides!)
e.g. these ECU’s will be updated, there will be a screen in the truck showing, safety arrangements, etc… 5

6. Volvo architecture

7. To discuss
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
Objective of this slide: Open disussion

8. Contact details Implementation leader: Maria Tevell
Phone:
Application leader: Bruno Duchet
Phone:

9. Speed limiter
Objective of this slide: Present WHY do we want to do this
e.g. R&D work at Volvo has shown that XX % of fuel, while driving in urban areas, can be saved by applying an acceleration limiter… etc… In FREILOT we are interested to taking this work further and have real-life tests with our clients…
5% on Urban delivery cycle (measured on "BMSVI" engine test bench that simulate a complete vehicle and journey)

10. Background
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
Objective of this slide: Present WHY do we want to do this
e.g. R&D work at Volvo has shown that XX % of fuel, while driving in urban areas, can be saved by applying an acceleration limiter… etc… In FREILOT we are interested to taking this work further and have real-life tests with our clients…

11. Proposed implementation
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
Objective of this slide: Present HOW do we want to do this (This can actually be few slides!)
e.g. these ECU’s will be updated, there will be a screen in the truck showing, safety arrangements, etc…
EMS= engine management system

12. Proposed implementation
Depending on road profile or speed zone
Road profile
Speed zone

13. Proposed implementation

14. To discuss
Final implementation of the function in the hardware of the truck
Interest for customer for a system based on speed zone and back office
Back office and speed zone definition, (fleet, service provider, city)
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?
1. Is the system an after market solution or does it have to be built in from the beginning into trucks?
- Both are feasible. From the retrofit we will develop for FREILOT, there is not so much to improve for a soft offer. But this has to be deeper studied. Also we don’t know the interest for customer for a system based on speed zone and back office
2. How will we determine the price it would cost to purchase and install the system?
- To be evaluated during the pre study
3. How do we tackle security implications if max allowed vehicle speed is sent via air?
- Encrypted signal could help us.

15. Contact details Implementation leader: Maria Tevell
Phone:
Application leader: David Chandon
Phone:

16. Back-up

17. Speed plan management