Method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio
First Claim
1. A method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio, which is arranged in the valve of the pneumatic tire and containsa power source;
- a pressure sensor;
an analog/digital converter for digitizing the pressure signal obtained from the pressure sensor;
a memory for storing the pressure signal;
a transmitter;
a comparator, in particular in a module with a microprocessor, and a timing switch,wherein the timing switch activates the device at the time intervals for a measurement and comparison operation and otherwise keeps it deactivated for purpose of power conservation,the pressure sensor submits a pressure signal to the comparator,the comparator compares the pressure signal with a previously stored comparison pressure signal, generates a signal if the deviation of the pressure signal from the comparison pressure signal exceeds a threshold, activates the transmitter, which thereupon transmits a datum regarding the detected deviation to a receiver arranged in the vehicle, stores the pressure signal and constitutes, with said pressure signal, a new comparison pressure signal which replaces the previous comparison pressure signal, andwherein the comparison pressure signal is constituted by averaging a number of pressure signals previously supplied by the sensor.
5 Assignments
0 Petitions
Accused Products
Abstract
A method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio, which is arranged in the valve of the pneumatic tire and contains a power source; a pressure sensor; an analog/digital converter for digitizing the pressure signal obtained from the pressure sensor; a memory for storing the pressure signal; a transmitter; a comparator, in particular in a module with a microprocessor, which compares the pressure signal with a previously stored comparison pressure signal, generates a signal if the deviation of the pressure signal from the comparison pressure signal exceeds a threshold, and activates the transmitter, which thereupon transmits a datum regarding the detected deviation to a receiver arranged in the vehicle; and a timing switch which activates the device at time intervals for a measurement and comparison operation and otherwise keeps it deactivated for purpose of power conservation. The comparator stores the pressure signal and, with said pressure signal, constitutes a new comparison pressure signal which replaces the previous comparison pressure signal.
51 Citations
12 Claims
-
1. A method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio, which is arranged in the valve of the pneumatic tire and contains
a power source; -
a pressure sensor; an analog/digital converter for digitizing the pressure signal obtained from the pressure sensor; a memory for storing the pressure signal; a transmitter; a comparator, in particular in a module with a microprocessor, and a timing switch, wherein the timing switch activates the device at the time intervals for a measurement and comparison operation and otherwise keeps it deactivated for purpose of power conservation, the pressure sensor submits a pressure signal to the comparator, the comparator compares the pressure signal with a previously stored comparison pressure signal, generates a signal if the deviation of the pressure signal from the comparison pressure signal exceeds a threshold, activates the transmitter, which thereupon transmits a datum regarding the detected deviation to a receiver arranged in the vehicle, stores the pressure signal and constitutes, with said pressure signal, a new comparison pressure signal which replaces the previous comparison pressure signal, and wherein the comparison pressure signal is constituted by averaging a number of pressure signals previously supplied by the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification