Patent ID: 6062072
Filing Date: 2000-05-16
Classification: B60C,H01Q

Abstract:
Device for monitoring the air pressure in the air chamber of pneumatic tires of vehicles comprising:a pressure measuring system arranged on a vehicle wheel which registers the pressure in the air chamber of the tire and emits a representative electrical pressure signal for the pressure value;a transmitter arranged on a vehicle wheel which receives the issued pressure signal from the pressure measuring system and sends an appropriate pressure send signal out;a receiver arranged at a distance from a vehicle wheel which receives the signal transmitted by the transmitter;as well as an antenna which is not integrated in the transmitter, but rather while being in electrical connection with the transmitter, is arranged independently therefrom in the wheel,wherein said transmitter comprises a stand-by mode, in which said pressure send signal is sent out to said receiver at predetermined time intervals andwherein a monitor is provided in said transmitter which switches said transmitter in an active send mode when the pressure in the tire drops by a pressure gradient above a predetermined value.