Method for the transmission of signals in a bus system, superposed on a direct supply voltage

US6870282B1 · kind B1 · utility

Assignees

• Conti Temic microelectronic GmbH · DE
• Robert Bosch GmbH · DE

Inventors

• Michael Bischoff · Brentwood, US
• Ruediger Deppe · Ingolstadt, DE
• Guenter Fendt · Schrobenhausen, DE
• Thomas Huber · Iffeldorf, DE
• Norbert Mueller · Ostseebad Nienhagen, DE
• Werner Nitschke · Ditzingen, DE
• Johannes Rinkens · Ingolstadt, DE
• Peter Schaedler · Ludwigsburg, DE
• Stefan Schaeffer · Ingolstadt, DE
• Werner Steiner · Schrobenhausen, DE

Key dates

• Filing date: Oct 17, 2000
• Grant date: Mar 22, 2005
• Expiry date: May 12, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2012/40273
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Previously in a bus system, voltage signals were transmitted from the central unit to the modules, which could reply thereto by variation of the current input. A disadvantage thereby is the relatively high susceptibility to interference of the current input, which itself already must be kept relatively small due to the energy consumption, as well as the correspondingly high effort and expense for an error-free recognition of the signals transmitted from the modules in the central unit. It is now suggested, that the modules also answer to the central unit by means of voltage signals superposed on the direct supply voltage, whereby for the time duration of the signal transmission by the modules, the central unit provides the direct supply voltage to the bus line over a resistor, so that the voltage signal of the module can be detected in the central unit on the bus line on the side of the resistor facing away from the direct supply voltage. A preferred application for bus systems in motor vehicles, especially for a sensor data bus, is provided.