Device for the monitoring & wireless signaling of a pressure or a change of pressure in pneumatic tires
First Claim
1. A system for monitoring and wireless signaling of a pressure or a change of pressure in pneumatic tires on vehicles, comprising:
- wheel electronics that are disposed inside the pneumatic tires and are provided with a battery as a power source, the electronics comprising a pressure sensor for measuring the pressure or the change of pressure, with a RF-transmitter for transmitting a signal derived from the signal of the pressure sensor, and a first receiver for receiving wireless interrogation signals and/or control signals, a second receiver arranged in or on the vehicle and which receives the signal derived from the signal of the pressure sensor, a device for signaling to the driver information relating to the pressure or change of pressure, and transmitters for emitting interrogation signals and/or control signals, the transmitters being disposed, respectively, individually near each running wheel and having a transmission frequency of less than 1 MHz, said transmitter for emitting interrogation and/or control signals as comprising an oscillating circuit comprising a radiator and an amplifier having an amplifier input and an amplifier output, the amplifier output being coupled back to the amplifier input.
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Accused Products
Abstract
A system for the monitoring and wireless signaling of a pressure or a change of pressure in pneumatic tires on vehicles, comprising wheel electronics that are disposed inside the pneumatic tire and are provided with a battery as a power source, with a pressure sensor for measuring the pressure or the change of pressure, with a RF-transmitter for transmitting a signal derived from the signal of the pressure sensor, and with a (first) receiver for receiving wireless interrogation signals and/or control signals, a (second) receiver which is arranged in or on the vehicle and which receives the signal derived from the signal of the pressure sensor, a device for signaling to the driver information relating to the pressure or change of pressure, and transmitters for emitting interrogation signals and/or control signals, the transmitters being disposed, respectively, individually near each running wheel and having a transmission frequency of less than 1 MHz.
26 Citations
20 Claims
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1. A system for monitoring and wireless signaling of a pressure or a change of pressure in pneumatic tires on vehicles, comprising:
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wheel electronics that are disposed inside the pneumatic tires and are provided with a battery as a power source, the electronics comprising a pressure sensor for measuring the pressure or the change of pressure, with a RF-transmitter for transmitting a signal derived from the signal of the pressure sensor, and a first receiver for receiving wireless interrogation signals and/or control signals, a second receiver arranged in or on the vehicle and which receives the signal derived from the signal of the pressure sensor, a device for signaling to the driver information relating to the pressure or change of pressure, and transmitters for emitting interrogation signals and/or control signals, the transmitters being disposed, respectively, individually near each running wheel and having a transmission frequency of less than 1 MHz, said transmitter for emitting interrogation and/or control signals as comprising an oscillating circuit comprising a radiator and an amplifier having an amplifier input and an amplifier output, the amplifier output being coupled back to the amplifier input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for monitoring and wireless signaling of a pressure or a change of pressure in pneumatic tires on vehicles, comprising:
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wheel electronics disposed inside the pneumatic tires and provided with a battery as a power source, the electronics comprising a pressure sensor for measuring the pressure or the change of pressure, a RF-transmitter for transmitting a signal derived from the signal of the pressure sensor, a first receiver for receiving wireless interrogation signals and/or control signals, a second receiver arranged in or on the vehicle and which receives the signal derived from the signal of the pressure sensor, a device for signaling to the driver information relating to the pressure or change of pressure, and transmitters for emitting interrogation signals and/or control signals, the transmitters being disposed, respectively, individually near each running wheel and having a transmission frequency of less than 1 MHz, said transmitter for emitting interrogation and/or control signals comprises an oscillating circuit, the oscillating circuit comprising a radiator arranged in the wheel case of the vehicle, an amplifier having an amplifier input and an amplifier output, the amplifier output being coupled back to the amplifier input, a comparator which transforms a voltage applied to its input, which varies over time, to a square-wave voltage, wherein the oscillating circuit is a series-resonant circuit, an active resistance to which the radiator provides the predominant contribution, the oscillating circuit has a Q value of at least 20. a current meter for measuring the current flowing through the radiator and for supplying measured values to a logic circuit, wherein the transmission frequency of the transmitter for emitting interrogation and/or control signals is 50 to 300 kHz - View Dependent Claims (20)
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Specification