Vdo Road speed limitation

Road speed limitation

for commercial vehicles

www.vdo.com

Mobility shapes

our life – moving ahead

is our passion

A passion for mobility drives us to achieve new goals,

to push further and to move boundaries. As a global

supplier, we are concentrating on our core competen-

cies: On innovations and technically demanding solu-

tions. And implementing them. Faster, more efficiently

and more successfully than others. Our claim reads:

We want to be the best in the industry – we want to

make future mobility safer, more convenient and sus-

tainable.

We have been developing a wide range of products

and solutions for commercial and special vehicles for

over 80 years. And the requirements are constantly

changing. Increasingly heavier traffic, the ever-de-

creasing availability of raw materials and our increas-

ing sense of safety and environmental awareness

mean that we are constantly facing new challenges.

We seize on these tasks, seeing them as an opportu-

nity to place trust in the knowledge of our many spe-

cialists in a lot of different fields of business, particularly

in the commercial vehicles sector. As market and

technology leader for tachographs, and with our control

and monitoring systems for drive and on-board elec-

tronics, the on-board units for toll collection, the tele-

matic units and display instruments, we are securing

the economic and ecological progress of the commer-

cial vehicle industry for today, tomorrow and the future.

General information 4

Technical conditions 6

Legal requirements 7

Solutions 8

Advantages 10

General information

Excessive speed in driving heavy vehicles has been a

social and governmental issue around the world for

many years, primarily from the perspective of road safe-

ty. With increased engine power and long axle ratio,

attainable speeds for trucks are currently much higher

than the speed limits on highways and secondary

roads in many countries.

Excessive speed in trucks has numerous conse-

quences, including:

•Higherratesofaccidentsinvolvingfatalities

and serious injuries

•Increasedoperatingandmaintenance

costs for the transport industry

•Increasedcostsforinsurancecompanies

•Greaterenvironmentalpollution

One effective solution to prevent speeding in com-

mercial vehicles is to equip them with a road speed lim-

iter system, which restricts maximum road speed to

the required speed limit without loss of engine power.

This is realized by limiting the required fuel demand ac-

cording to a set speed limit. The maximum speed

limit is set using an electronic control unit.

Information about the current speed of the vehicle is

measured with a speed sensor that supplies an elec-

tronic speed signal to the control unit. The control unit

limits the fuel output in different ways, depending on

the fuel injection technology of the engine. In addition

to its main function, limiting the maximum speed, the

system offers a variable speed limiter as an option. The

driver can activate this feature below the maximum

speed limit in areas with lower speed limits.

Furthermore, the speed limiter includes additional

speed limit inputs to preprogram smaller speed limits

than the maximum speed. This functionality can be

used to prevent fast driving if any special function in

the vehicle is activated (like open doors on a city

bus or people on the platform in the back of a garbage

truck).

Mechanically controlled engines

Engine revs are regulated with a mechanical throttle

pedal, which transmits the pedal position mechanical-

ly via a throttle cable or rod to the injection pump (or

throttle body). The fuel demand on the injection pump

is adjusted via a mechanical injection pump lever or

a mechanical throttle plate. To realize a speed limiting

system on a mechanically controlled engine, an elec-

tromechanical speed limiter is used to decouple the

driver’s demand from the injection pump in order to

limit the maximum speed. In this application, the vehicle

must be equipped with a separate speed limiter sys-

tem.

Electronically controlled engines

Engine revs are regulated with a mechanical throttle

pedal which converts the mechanical pedal position

to an electrical signal, and transmits it via an electrical

wire to an electronic control unit. The control unit

regulates the fuel demand via electronic injection such

as electronic diesel control (EDC), a pump line nozzle

system (PLD) or common rail direct injection (CDI).

In this application, the speed limiter function could be

one of numerous functions managed by the engine’s

or vehicle’s electronic control unit.

Example of a mechanically controlled engine

Example of an electronically controlled engine with speed

limiter function in the engine or vehicle ECU

Mechanical injection pump Mechanical linkage

Electrical throttle positionElectronic injection system

Technical conditions

Two different engine technologies used in vehicles require different speed limiter

device applications.

Experience from different countries and regions of the world has shown that successful implementation

of a speed limiter directive rests on three major pillars:

•Technicalrequirementsforspeedlimitersystems

•Legalrequirementsforimplementation

•Testingrequirements(vehiclemonitoringintraffic)

Graphical depiction of implementation of a speed limiter directive

A speed limiter directive must define

Compile statistics after law has come into effect in order to make corrections

Legal requirements

Technical Requirements

•Systemrequirements

•Systemapproval

Testing Requirements

•Regularvehiclechecks

•On-roadmonitoringbypolice

•Roadworthiness

(approved bodies)

•Enforcement

Manufacturer (of speed limiter or of vehicle) must

•Obtainsystemapproval

•Obtainauthorizationfromregulatoryauthority

to set up workshops

•Educateworkshoppersonnel

•Monitorworkshops

Onroad and roadworthiness checks

•Policemustbeinformedbymanufacturerto

check vehicles on road

•Approvedbodiesneedthesameinformation

•Establishfines

Legal Requirements

•Vehiclecategories

•Maximumspeed

•Dates(introductiontimeframe)

•Authorization(workshops)

Solutions

VDO OEM solutions for commercial vehicles

VDO offers a wide range of vehicle controllers and

electromechanical actuators for commercial vehicles,

most of which include functionality for a road speed

limiter. These devices are specially designed in co-

operation with truck manufacturers. The product spec-

trum consists of various controllers including:

•Powertrainmastercontrolunit

•Transmissionandretardercontrolunit

•Rearaxlecontrolunit

VDO Pedal Interface II Retroﬁt solution for

electronically controlled engines

Pedal Interface II consists of an electronic control unit

that is installed between the pedal sensor and the

engine management system, and can be custom pro-

grammed. Three versions of Pedal Interface II are

available: Standard, Enhanced and Premium (See func-

tionality comparison). The setting signals are easy to

manage effectively according to how the system is pro-

grammed, and fixed additional functions may also be

activated. The special configuration of the Pedal Inter-

face II makes it unnecessary to adjust the hardware

and software associated with standard engine manage-

ment system. This makes Pedal Interface II suitable

for use on nearly all types of vehicles. It can be config-

ured by authorized personnel to meet the needs of a

wide range of applications.

Pedal Interface II configuration diagram

Configuration Diagram

Accelerator pedal with sensor VDO Pedal Interface II Vehicle engine management/injectors

Diagnostics Speed signal

Flexible control stalk LED control stalk Standard control stalk

Tempostat® cruise control • • •

Flexible speed limitation and speed selection

Variable road speed limiter • • •

Customsettingofmax.speedbetween30and200KPH

Road speed limiter • •

Deﬁne maximum top speed

Additional road speed limiter • •

Program up to 7 additional speed limitations on control unit (Premium)

Engine speed limit • •

Deﬁne a maximum top engine speed

Fixed engine speed control facility •

Program up to 7 additional engine speed limitations on control unit (Premium)

Variable engine speed control facility •

Custom engine speed options via remote control handset up to a deﬁned max. engine speed

Fuel limitations •

Program up to 7 fuel limits via the status inputs (Premium)

Functions

*A maximum of 7 limits may be set in total.

Standard Enhanced Premium*

Functionality of the three Pedal Interface II versions

Various control stalks available

Electrical Actuator

Mechanical Linkage

Electronic Control Unit

Vehicle Speedometer

AGB III is the third generation of automatic speed limit-

ers. Its construction corresponds to European regula-

tions. In addition to the top speed limiter, which limits

vehicle speed to a preprogrammed value, the unit in-

cludes a variable speed limiter for use at speeds be-

tween30KPHandthemaximumspeedlimit.By

pressing the variable speed limiter switch, the driver

can choose any speed within this range, and the con-

troller limits the speed according to the driver’s de-

mand. Alternatively, the unit can be preprogrammed for

a second speed limit below the maximum speed limit.

The electronic control unit is self-diagnosable. The

electrical actuator is a device that has been tested

and proved over years of operation in everyday use.

Various application sets are available.

VDO control ECUs for

power train applications

VDO AGB III Retroﬁt and OEM solution

for mechanically controlled engines

Advantages

The advantages of VDO road speed limiter systems

are their own best advertisement:

•Reducedaccidentriskduetolimitationofthe

maximum vehicle speed

•Decreasedenvironmentalpollutionduetominimized

pollutant emissions

•Driverisabletodevotefullattentiontothetraffic

environment, because there is no need to monitor

speed visually

•Easyinstallationofretrofitsystems

•Morethan30yearsexperienceinspeedlimiter

devices and directives worldwide

•Loweroperatingcostsasaconsequenceof

– reduced wear

– reduced fuel consumption

– lower service costs

– longer vehicle lifetime

– elimination of fines for speeding

Without Road Speed Limiter

SpeedinKPH

Road Speed

Vehicle speed monitoring with and without Road Speed Limiter

RoadSpeedLimiter90KPH

CurrentLimitKPH

140

120

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

Time in sec.

SpeedinKPH

Road Speed

140

120

100

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

Time in sec.

Continental Trading GmbH

Kruppstrasse 105

60388 Frankfurt

Germany

Phone: +49 69 40805-0

Fax: +49 69 40805-210

[email protected]

www.vdo.com

VDO – A Trademark of the Continental Corporation

The information provided in this brochure contains only general descriptions or performance characteristics, which do not always apply as described in case of actual

use or which may change as a result of further development of the products. This information is merely a technical description of the product. This information is not

meant or intended to be a special guarantee for a particular quality or particular durability. An obligation to provide the respective characteristics shall only exist if expressly