Device for monitoring and wirelessly indicating a pressure or a pressure change in pneumatic tires mounted on vehicles
First Claim
1. Device for monitoring and wirelessly signaling a pressure, or a change in pressure, in pneumatic tires on vehicles comprising:
- a pressure sensor for measuring the pressure or the change in pressure;
a transmitter for transmitting a signal derived from the measuring signal of the pressure sensor;
a control circuit that activates the transmitter intermittently to submit said derived signal;
a battery as current source;
and a back-up capacitor connected in parallel to the battery; and
wherein a controllable switching unit is provided which is so controlled such that the back-up capacitor is connected in parallel to the battery intermittently before the control circuit activates the transmitter and for a limited period of time during the transmitting operation of the transmitter.
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Accused Products
Abstract
A device for monitoring and wirelessly signaling a pressure, or a change in pressure, in pneumatic tires on vehicles having a pressure sensor for measuring the pressure or the change in pressure; a transmitter for transmitting a signal derived from the measuring signal of the pressure sensor; a control circuit that activates the transmitter only from time to time; a battery (1) as current source; and a back-up capacitor connected in parallel to the battery. A controllable switching unit is provided by means of which the back-up capacitor can be connected in parallel to the battery from time to time for a limited period of time only.
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Citations
20 Claims
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1. Device for monitoring and wirelessly signaling a pressure, or a change in pressure, in pneumatic tires on vehicles comprising:
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a pressure sensor for measuring the pressure or the change in pressure; a transmitter for transmitting a signal derived from the measuring signal of the pressure sensor; a control circuit that activates the transmitter intermittently to submit said derived signal; a battery as current source; and a back-up capacitor connected in parallel to the battery; and wherein a controllable switching unit is provided which is so controlled such that the back-up capacitor is connected in parallel to the battery intermittently before the control circuit activates the transmitter and for a limited period of time during the transmitting operation of the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification