DE102006052525A1 - Generators e.g. alternators of motor vehicle i.e. passenger car, operating device, has external wirings attached to generators that are supplied with voltages, where voltages differ from each other in presettable manner - Google Patents

Abstract

The device has external wirings (L1, L2) attached to generators (G1, G2, G3, G4), where generators are supplied with voltages (UB). The voltages differ from each other in a presettable manner. A data line (L) is a component of a bus system. The bus system has a local interconnect network bus, and the generators are clearly evaluated by evaluation of the supplied voltages at the network bus. An independent claim is also included for a method for operation of generators.

Description

State of the art

For the power supply of cars is almost always a single generator used to supply the electrical system. In commercial vehicles, several generators are partly connected in parallel because of the higher power requirement. For economic reasons, these are usually of exactly the same type, so that only a single type or generator needs to be maintained during repairs, thereby massively simplifying warehousing and logistics. An electrical system with two parallel generators, for example, in the DE 102004008433.5 described.

In The last few years has become increasingly important for the control of generators enforced the digital technology in the form of data buses. In the Vehicle technology can primarily find LIN interfaces or LIN buses Use. Such digital buses usually allow this the control of several devices.

Is possible now, to connect to such a data bus multiple generators. Problematic But then the control of the various generators: The equipment (here generators) need for the bus be distinguishable to diagnose and control them individually to be able to. On the other hand, however, as described above, exactly the same equipment required. There are bus systems designed for such conditions are (e.g., Ethernet), but the necessary protocols are right complex. Common vehicle buses, and especially the LIN-BUS, are unable to make such a distinction. Here must the equipment be clearly identifiable on the bus.

Object of the invention

task The invention is a unique identification of to a data bus connected devices, especially generators.

Disclosure of the invention

The Invention allows in an advantageous manner, several, not fundamentally different Equipment, In particular, use generators on a bus, especially LIN bus. There are different stickers on regulator or generator, Serial numbers, manufacturing tolerances, etc. are not here as differences too see. These are functionally identical generators with the same Type part number, in a particularly advantageous manner by means of different external coding can be distinguished, creating an advantageous Parallel operation possible is.

Further Advantages of the invention will become apparent from the features of the subclaims. For example, can the distinctness by means of several lines, which are different Tension be brought, preferably two lines, each with two different voltages in four generators or by means of a Line and one of the number of generators corresponding different Voltages are realized. The coding by means of voltages has the advantage of a particularly low susceptibility to interference.

detailed Description of structure and function with possible alternatives.

Base Distinguishability is the external shading of the generator. In this case, one or more connections of each generator through the vehicle in defined states from which the generator in turn derives a state, by means of which he becomes distinguishable on the bus. This can be a parallel operation be realized with a distinction by external coding. This will be clarified by means of two examples.

Example 1 is shown schematically in the figure. There are four generators G1, G2, G3, G4 present, the generator G1 as a master and the generators G2, G3 and G4 as slave 1, slave 2 and slave 3 work. There are two lines L1 and L2 for the assignment of the generator property. Via the lines L1 and L2, the voltages U _{B +} or U _B- or U, which are designated in greater detail below, are supplied to the associated terminals A1, A2 of the generators. The lines L1 and L2, together with the associated connections of the generators, form the external circuit. In addition, a line L to each generator is required for the synchronization of the generators. The line L is for example a bus system, in particular a LIN bus Management: L1 L2 Result Status: U _{B +} U _{B +} → generator 1 (master) Status: U _{B +} U _B- → generator 2 (slave 1) Status: U _B- U _{B +} → generator 3 (slave 2) Status: U _B- U _B- → generator 4 (slave 3)

Here is digitally coded. Each line can assume two states U _B and U _{B +} , respectively.

Example 2: There is only one external coding line L1, with four different voltage levels, which can take the voltages given below.
Line: L1
Condition: U = 24V → Generator 1
Condition: U = 16V → Generator 2
Condition: U = 8V → generator 3
State: U = 0V → generator 4

Here become a multi-stage voltage different generators Are defined.

mixtures from the described methods, e.g. two lines with three Level states, are allowed. Core is the coding over the external wiring.

The Generators can then, based on their self-identified assignment, e.g. various Bus addresses, identifiers or other distinguishing features of the Assign used bus. If the generators then as individual Participants are logged on the bus they can according to the control unit individually controlled and diagnosed.

Claims (10)

Device for operating at least two devices, which are connected to one another at least by means of a data line, characterized in that the devices are assigned an external circuit (A1, A2, L1, L2) via which at least one voltage (U ₊ , U _- ; U,) can be supplied, wherein the supply voltages (U ₊ , U _- ; U,) differ from each other in a predeterminable manner. Device according to claim 1, characterized in that that devices Generators (G1, G2, G3, G4) are, in particular three-phase generators for a Motor vehicle. Device according to Claim 1 or 2, characterized the data line (L) is part of a bus system. Apparatus according to claim 3, characterized in that the bus system comprises a LIN bus and the devices, in particular generators (G1, G2, G3, G4) by evaluating the supplied voltages (U ₊ , U _- ; U,) on the bus uniquely identifiable are. Device according to one of the preceding claims, characterized characterized in that the devices, In particular generators (G1, G2, G3, G4) by design, not from each other are distinguishable. Device according to one of the preceding claims, characterized characterized in that the external wiring one or more additional connections (A1, A2) of each device, in particular each generator (G1, G2, G3, G4). Apparatus according to claim 6, characterized in that each device, in particular generator two additional terminals (A1, A2), to which the voltages (U _{B +} ) or (U _B ) can be fed. Device according to claim 6, characterized in that that every device, in particular each generator (G1, G2, G3, G4) an additional Terminal (L1), the four different voltages, in particular 0, 8, 16, 24 Volt can be supplied are. Method for operating at least one device according to one of the preceding claims, characterized in that the external wiring of each generator (G1, G2, G3, G4) is used as the basis of distinctness, and one or more terminals of each generator (G1, G2, G3, G4) by ex means are brought into defined states, from which each generator (G1, G2, G3, G4) derives a state, by means of which it is distinguishable on the bus. Method for operating at least one device according to one of the preceding claims, characterized that the distinction of the devices, in particular generators (G1, G2, G3, G4) by means of external coding he follows.