Ebsi hat geschrieben:.....
Beim im Motorrad verwendeten CAN-Bus-System handelt es sich nach meinem Kenntnisstand nicht um einen "echten" CAN-Bus wie im PKW.
Das System überwacht lediglich die Stromstärken in den Stromkreisen, schaltet diese bei Überlast aus und ersetzt somit die Sicherungen die früher bei Überlast durchgebrannt sind.
Die Aktivierung der einzelnen Verbraucher geschiet wie vor Jahren über Schalter oder Relais im Stromkreis.
Wer also keine Stromkreise überlastet bekommt auch keinen Ärger mit dem unechten CAN-Bus.
..........
Grüsse
Eberhard
Moin Eberhard,
es handelt sich um ein CAN-Bus System, da jibbet nix 'unechtes'.
Nur mal ein paar Infos der R1200GS, weil ich keinen Bock habe den ganzen Kram zu tippen ..
Solltest Du Lust haben, Dich weiter in das Thema einzulesen:
http://www.vector.com/vi_can_de,,2816.html
Gruß
Dieter
Innovations in the on-board network - the BMW Motorcycle Single-Wire System (SWS)
Another special feature of the R1200GS is the new on-board electrical system. The term Single-Wire System describes a highly innovative on-board network using electronics and CAN-bus technology (Controller Area Network) to offer functions and features never before seen. Reducing the number and length of cables required, this network offers a much wider range of functions than a conventional on-board network, information being transmitted along just one single path (hence "single-wire") as opposed to the double-wire system otherwise required.
Apart from a wide range of functions, the main advantages of this intelligent combination of electrics and electronics are lighter wiring harnesses, substantial resistance to interference, and a complete range of diagnostic functions. A further point is that the system may be flexibly expanded by simple updates.
The basic principle of the Single-Wire System is to connect all control units, sensors, and power-consuming items via one single, common wire in order to form a complete network transmitting all signals regardless of their subsequent function. In other words, all information is readily available at all times for all the components.
Signals are assigned and transmitted to the respective power-consuming item at junction points in the electronic system of each control unit. Here the signals, or data, are processed and then used to activate the functions desired in the respective component. This eliminates the need for elaborate cabling (required for each function operating through a separate wire) thus reducing potential effects and errors in a conventional on-board network using a large number of cables. This is an important factor in contributing to a system's high standard of reliability.
All control units are connected to one another and are able to communicate directly and exchange data in a bi-directional mode. This allows simple and comprehensive diagnosis of the entire system from one central point - the electronics incorporate suitable programs in order to filter out unimportant data and interference signals within a defined tolerance. It therefore makes the system less sensitive to electromagnetic disturbance.
In all, the new R1200GS comes in standard trim with three control units (the cluster instrument represents a control unit in its own right). The control unit for the Digital Motor Electronics (BMS-K) is not only responsible for the engine management (already described) but also transmits all data to the central diagnostic system. Central Suspension Electronics (CSE) serves to mastermind the electrical units and functions not specific to the engine.
And if the motorcycle is fitted with Integral ABS and an anti-theft warning system (as an option) the control units are also integrated in the network.
There is no need for conventional fuses at any point throughout the on-board network, the electronic processor simply switches off the function involved in the event of a short-circuit or malfunction. Subsequent diagnosis will quickly trace and remedy the defect. Since other functions are not affected, the network philosophy featured on the R1200GS therefore offers further advantages in reliability and failsafe operation.
The control units also provide relay functions, only the starter being controlled via a conventional relay.
The electrical system on the R1200GS is supplied with power by a low-weight alternator developing 600W at 40 amps. The maintenance-free battery has a capacity of 14Ah.
After 20 years experience in electronic engine management and 15 years experience with ABS technology, by introducing this new on-board network, BMW Motorrad has taken its next innovative step into a successful future.
Electronic immobiliser for optimum security
To ensure optimum security at all times, the R1200GS is equipped with an electronic immobiliser as standard. Controlled by a transponder in the ignition key, the immobiliser offers the best in anti-theft security and maintains the high standard found in BMW cars.
As soon as the rider inserts the key and switches on the ignition, a chip within the key communicates with the electronic immobiliser integrated in the Digital Motor Electronics via a ring aerial in the ignition lock. This allows the systems to exchange and compare coded chip data and the electronic immobiliser data. After confirming that the data and signals comply with one another, the engine control unit will release the ignition and fuel injection, allowing the rider to start the engine. This technology is the best and safest immobiliser system currently available worldwide.