Mercedes-benz Aktiengesellschaft

Daimler-benz Ag

Temic Telefunken Microelectronic Gmbh

Bernd Haussler

Thilo Kuhner

Bernhard Rall

Max Reeb

Detlef Kaminski

Franz-Josef Petry

Rolf Adomat

Jurgen Dorner

Thomas Thurner

Benno Meyer

Alexander Dorr

Michael Brodersen

Wolfgang Kremer

Herbert Fiessinger

Karlheinz Muller

Sebastian Grimmeisen

German Munk

A data bus system including a serial data bus operated with complementary logic signals, several system users, communicating with each other via the bus lines of the data bus, and several output stages complete with a transmitter and a receiver, where each system user is assigned an output stage for coupling to the data bus. The output stage of each system user features a terminating network, with the determining network of at least on output stage being low impedance, active, switching, and internally switchable, with the terminating network of at least one more output stage being passive and low impedance, and with the terminating networks of all other output stages being passive and high impedance.

Data bus system

A method for monitoring symmetrical two-wire bus lines and two-wire bus interfaces and a device for carrying out the method provides pulse weighting of low to high transitions or high to low transitions of the two wires operated in phase opposition of a two-wire bus line. The pulse chains thus obtained are used for step sequencing. In each case, one multistep shift function which is assigned to the first bus wire, is supplied with a first, constant logic read in state and can be reset to a second logic state in all-step fashion and, for all-step resetting of a similar second multistep shift function assigned to the second bus while, and vice versa, the step last achieved for each multistep shift function characterizing the respective fault state of the other bus wire. The pulse weighting is achieved by differentiation or high-pass filtering or by pulse generation controlled by state transition. For the pulse weighting, the device uses simple RC elements or edge-controlled monostable times, and for the multistep shift functions, two similar shift registers are used which can be loaded serially and clocked and reset in parallel and which can also be realized in one piece as a component of a monolithic semiconductor circuit by the previously mentioned elements. The device has a fault tolerance which can be programmed with respect to the bit width, and in conjunction with a likewise settable input cutoff frequency permits the decentralized local testing of two wire bus-type networks. The device can be made using CMOS technology, in conjunction with a very low space requirement.

Method for monitoring symmetrical two-wire bus lines and two-wire bus

A method for programming a bus-compatible electronic motor vehicle controller that is equipped with at least one microcomputer to implement its control function and with ROM and RAM in order to accommodate and handle applications software required for the control function, and is also equipped with at least one bus protocol chip, the ROM being programmed such that the applications software communicates with a bus via the bus protocol chip and via a specific instruction and communications interface forming a first interface of the bus protocol chip. The method includes providing a second interface, which is independent of the bus protocol chip, and defining the second interface as a further, universal instruction and communications interface. The first and second interfaces are coupled with a driver module that is independent of the applications software and adapted to the bus protocol chip and has the properties of an adapter. The applications software are matched and aligned exclusively to the second interface with respect to the bus communication and the applications software is produced independently of the bus protocol chip. The applications software and the driver module are linked to one another by a link process. Program code is obtained as a result of the link process. The program code is stored such that the program code is resident in the ROM.

Method for programming a bus-compatible electronic motor vehicle

A cable arrangement with two pairs of conductors for two separate circuits, one conductor of a pair is split into two partial conductors. Neutralization, i.e., capacitive and inductive uncoupling of the two circuits is possible by symmetrical arrangement of the conductors.

Cable arrangement

Growing community of inventors

Ostfildern, Germany

Bernd Haussler