engineer's guide to canbus

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Sensor-Technik UKThe CANbus Technology, Pressure and Force Measurement Spec ia l is t

The EngineersGuide to CANbus

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21st Century vehicles where modular

sensors and controls are connected to a

network ba ckbone a re now poss ible

thanks to the w ide ly us ed CANbus . You

ca n throw aw ay the wiring loom and

replac e it with two wires! S mart ga uges

and sensors can be directly connected to

the CANbus. Control modules can

rea d/send da ta, display sys tems ca n

rea d/log da ta a nd b eca use it is a

netw ork, it is irreleva nt wh ere

compo nents a re phys ica lly loca ted.

Information display panels show the

driver/ope rator wha t he need s to know.Log g ing of informa tion feed s the se rvice

sys tem a nd pane ls display information

where req uired, for example next to the

valves on a tanker. CANbus also has the

ba ndw idth to c ope with real-time c ontrol

as well as da ta co llection.

Feature Benef i t

Software set-up Flexible, lower production cost

Standard protocol Able to connect to different equipment

Comm unication Comm unicate with other equipment

Fault diagnostic Err or detection for faulty components

Data logging No more false warr anty claim s

Monitor ing Misuse protection

Memor y Repeat working functions

Inform ation Operator can make decisionsImproved logistics

Electronic controls Better operator working conditionsLonger working hours

Hydraulic remote No vibration, no hazardsBetter viewing

Single system Combined controlsInformation servicing, etc.

Safety Close down facility and error protection

Standard units International regulations and laws approved

Fewer mechanical parts High reliabil ity, minim um failure rates

Standard hardwar e Exclusive to Sensor-TechnikLower cost Reduced wir ing, weight

Low servicing costs, fast repair

Data sheets,

brochures and even

websites cant explain

the full advantages of

moving to CANbus

Why CANbus?

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Lowe r cost production, one set of

so ftware, one sys tem and o ne supplier

on a standard communication system

g iving you flexibility: The s a me a ss emb ly

can be set-up via the software to

individua l custo mer a pplica tions without

having to c hange any ha rdwa re.

Communication systems: DifferentCANbus co ntrollers a re ab le to

communicate with each other over the

sa me b us, i.e eng ine to trans miss ion,

to the operator panel or to a ny other

controller.

Easily controlled and consistently

precise w ork: C AN Controllers c a n b e

linked together. For example, a controller

on one vehicle can talk to another youca n a dd mac hinery on a trac tor and it will

wo rk tog ether. Repe a t wo rking functions

ca n be logg ed b y simple se lection,

g iving hig h repea tab le q uality of work.

Better operator working conditions and

long er working hours: P ush s witches a nd

joysticks replace heavy or difficult levers,

g iving be tter driver comfort and be tter

viewing as valve blocks, pipes etc areelimina ted from the c a b. No vibration,

mechanical shocks, fatigue, white finger

etc., and the operator interfa ce c an b e

se t up to individua l applica tions .

Reduced mechanical components,

minimum fa ilures: As the o perator pa nel

electronically talks to the controller, the

removal of the hydraulics in the driver

ca b ca n be a chieved des irab le as new

European regulations come into force.

The c ontroller ca n be mounted close to

the hydraulic system, allowing pipework

to be reduced.

Elimina ting being in the wrong pla ce ;

remote view ing : C ANbus ca n b e linked

with other equipment such as remote

controls, video ca meras and GP S

(Global Positioning System) to track a

vehicle a nd to ens ure it only wo rks whereit has b een a lloca ted.

Information the key to improvement

and sa ving money: C ANbus ca n bring

together several systems, such as

weighing systems, information logging,

sta tistics , s ervicing reports, time per job

and others.

Fast a nd low cos t servicing a ndba ckup: No mo re w a sted investig ation

into why a vehicle has a problem; the

fault diag nos tic with c omplete error

mes sa g e w ill hig hlig ht the problem and

its also available by mobile telephone.

Low cost servicing, fewer warranty

claims: S a fety features/error d etec tion

can b e ad ded to ensure eq uipment

cannot be overloaded or misused andonly co rrect co mma nds are executed. In

the event of misuse the process will be

stopped and logged.

High reliability where it counts, use of

standa rd s ensors at low c ost, no need

for special senso rs or new technology:

The input/output mo dules a llow you to

use yo ur alrea dy proven sens ors which

are tried and tested although yo u ca n

of co urse c omb ine them with up-to-da te

CANbus sens ors too!

M aking the move to

bus-based control is

a big step, but it

neednt be a difficul t

one. Whether you

need fully approved

components with a

proven track recordor com plete system

designs, we can

meet your

requirements. And

well be with you

every step of the way

The bene f i t s of CANbus

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CANbus co ntrol units a nd HMIs (Huma n

Machine Interfaces) are used in a wide

variety o f functions in mo bile a nd

sta tiona ry ap plica tions . Via the va rious

co nfig urable inputs a nd outputs it is

pos sible to c onnec t all types of se nsors

a nd a ctuators d irectly to the co ntrol

unit; the us er-prog ramme d co ntroller

monitors the sys tem inputs a nd allowseither clos ed loop or open loop control

of the outputs. This w a y, compo nents

suc h as proportiona l valves c a n be

controlled directly.

Tog ether with extende d d ia g nos tics

functions a nd the C AN interfa ce , the

system offers unmatched in-service

fac ilities . In ca se of failure (suc h a s

broken c a bles or sho rt circuits) it a llow susers to restore the vehicle to safe

co nditions and provides service sta ff

with the right tools for quick and easy

diagnostics. With the additional

possibility of remote (wireless)

maintained diagnostics, CANbus is

ca pab le of ma king a significa nt

co ntribution to increa se d ve hicle

availability and productivity.

More and more vehicle manufacturers

a nd a utomotive c ompone nt suppliers

a re realising the b ene fits o f the CANbussys tem. This technology ha s now

reache d a sta ge where internationa lly

a greed sta nda rds exist, so that different

ma nufac turers electronics ca n

communicate together. A typical

mod ern truck might ha ve se pa ra te

electronic modules controlling engine,

automatic gea rbox, ABS brakes and

on-bo a rd hyd raulic co ntrol. The eng ine

mod ule ha s a sens or rea ding RPM. Allthe other mod ules, s uch a s the

gearbox, need to know the engine RPM

to o pera te c orrec tly. The e ng ine m od ule

will broadcast the engine RPM message

on the CANbus , and a module

connected to the bus can receive the

mes sa g e a nd us e that informa tion. This

means that the engine RP M senso r

need only be connected to one of the

modules.

The versa tility o f CANbus mo dules is

evident from the wide rang e o f

a pplica tions in which they a re us ed:

sp ec ia lise d civil eng inee ring ; m ob ile

cra nes ; a g ricultural/ha rvesting

machinery; forklift trucks; refuse

co llec tion ve hicles; stea mrollers; a ircra ft

towing vehicles; road sweepers;

exca vators; fire eng ines ; military

eq uipment; b oa ts; s hipyard cranes;

digg ers; a nd ma ny others

Wha t c an CANbus do?Applications include:

Engine management

Electro-hydraulicsteering systems(steering-by-wire)

Hydrostatic drivecontrol

(driving-by-wire)

All control functionsof working hydraulic s

Transmission control

Automatic levelling

and positioning ofplatforms

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The Controller Area Network (CAN) was

originally developed by Bosch for use in

the a utomotive indus try, but has

esta blished itself as the s tanda rd b us

system for mobile applications, and is

defined under ISO 11898. CANbus

sys tems exhibit hig h tra nsfer ra tes up to

1Mbit/se c a nd high d a ta trans miss ion

reliability. A number of differentcapab