Tyre-pressure surveillance device and multipath receiver therefore

• Main Authors: SCHROETTLE, MICHAEL, SCHMIDIGER, WILLI
• Format: Patent
• Language: English; French; German
• Published: 11.07.2001
• Edition: 7
• Subjects: DEVICES OR ARRANGEMENTS RELATED TO TYRES; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE TYRES; VEHICLES IN GENERAL

The arrangement includes a signal generation arrangement on each wheel which detects the air pressure in the tyre and if necessary the tyre temperature and which provides corresponding electric pressure and/or temperature signals. A reception antenna (A, B, C,. .. N) is provided at each wheel and fastened stationary to the vehicle, adjacent to the respective wheel. A transmitting arrangement at each wheel produces a radio message which contains signals corresponding to the pressure and/or temperature signals, and transmits it to the receiving antennae. A central evaluation arrangement at the vehicle evaluates the radio message and provides a driver with information about the condition of the different tyres. Only one receiver is provided for all reception antennae, which is connected on one hand with the evaluation arrangement and on the other hand with the antennae over individual conductors. A multiplexer circuit connects a selected antenna or simultaneously several antennae to the receiver. The receiver detects the radio message and determines its field strength. The antenna with the largest field strength is selected, and the radio message is associated to the wheel which is adjacent to the selected antenna.