Circuit arrangement for transmitting measurement values on vehicle wheels

US4891973A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Lothar Bollweber · Steinmauern, DE
• Walter Jansche · Durmersheim, DE
• Robert Hugel · Kaufering, DE
• Claus-Dietrich Pilch · Remchingen, DE
• Manfred Rothley · Gondelsheim, DE
• Erich Zabler · Blankenloch, DE

Key dates

• Filing date: Jun 9, 1988
• Grant date: Jan 9, 1990
• Expiry date: Jun 9, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K17/97
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A circuit arrangement for transmitting variable measurement values, such as pressure and temperature, at vehicle wheels is provided which transmits the measurement values in the form of H-F signals to a stationary evaluating circuit (12) with great accuracy, high reliability and in short time intervals. A repeater coil (b 13), which is connected with the latter, arranged in the vicinity of the wheel so as to be stationary and connected to voltage by a square-wave generator (15), cooperates with a revolving repeated coil (19) which is fastened at the vehicle wheel and connected with a sensor circuit arrangement (20) supplied by it. The sensor circuit arrangement (20) contains a timing element (29) which responds to a voltage peak in the revolving repeater coil (19 l) at the end of a voltage pulse of the square-wave generator (15) and, with a corresponding delay, triggers a timing circuit (30) for transmitting the measurement values, which timing circuit (30) is connected with it on the output side, wherein the delay time of the timing element (29), together with the duty cycle of the timing circuit (30), is shorter than the pause time of the square-wave voltage at the square-wave ge…