Method for operating a device for the monitoring and wireless signaling of a pressure change in pneumatic tires of a vehicle

US6445286B1 · kind B1 · utility

Assignee

• BERU Aktiengesellschaft · DE

Inventors

• Ralf Kessler · Heidelberg, DE
• Andreas Kuhnle · Maulbronn, DE
• Norbert Normann · Mühlacker, DE
• Gunter Schulze · Holle, DE

Key dates

• Filing date: Oct 12, 2000
• Grant date: Sep 3, 2002
• Expiry date: Oct 12, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60C23/0459
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for operating a device for monitoring and indicating a pressure change in vehicle tires by wire, being preferably arranged in the tire as one module together with the tire valve, and comprising a current source, a pressure sensor arranged for measuring the tire pressure at first time intervals, an analog/digital converter for digitizing a pressure signal obtained from the pressure sensor, a memory for storing the pressure signal, a transmitter for transmitting the measured tire pressure information to a receiving unit located in the vehicle, a comparator, especially one realized in one module with a microprocessor, which compares the pressure signal with a previously stored comparison pressure signal and controls the transmitter in such a way that the transmitter will transmit signals at second time intervals greater than the first time intervals, so long as the decrease of the pressure signal, relative to the comparison pressure signal (drift), does not exceed a threshold value, but will transmit signals at third time intervals smaller than the second time intervals when and so long as the drift exceeds the pressure threshold value; to this end the second time intervals a…