Method and system for the detection of a pressure drop in a tire
First Claim
1. A method for detecting an air pressure drop in a tire, comprising the steps of:
- measuring air pressure within said tire;
measuring air temperature within said tire;
converting measured air pressure into a temperature compensated second air pressure, said converting being in accordance with said measured temperature;
determining temporal fluctuations of said temperature compensated second air pressure, said fluctuations being in accordance with a difference between said temperature compensated second air pressure and a predetermined temperature compensated reference air pressure; and
generating an alarm if said fluctuations exceed a predetermined threshold.
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Accused Products
Abstract
A system for the detection of a pressure drop in a tire comprising a tire air pressure sensor, a tire temperature sensor and an evaluating unit. The evaluating unit converts the measured air pressure values and temperature values into temperature compensated air pressure values and produces an alarm signal when the temporal fluctuation exceeds an air pressure fluctuation threshold value. The evaluating unit decreases the air pressure threshold value with increasing deviation from the measured temperature compensated air pressure value of a predetermined temperature compensated air pressure reference value. At least one further sensor may be provided for measuring a parameter which influences the air pressure in the tire whereby the evaluating unit corrects the measured and, regarding to the production of an alarm signal, evaluated air pressure according to this parameter.
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Citations
41 Claims
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1. A method for detecting an air pressure drop in a tire, comprising the steps of:
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measuring air pressure within said tire;
measuring air temperature within said tire;
converting measured air pressure into a temperature compensated second air pressure, said converting being in accordance with said measured temperature;
determining temporal fluctuations of said temperature compensated second air pressure, said fluctuations being in accordance with a difference between said temperature compensated second air pressure and a predetermined temperature compensated reference air pressure; and
generating an alarm if said fluctuations exceed a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting a pressure drop in a tire, comprising the steps of:
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measuring air pressure within said tire;
measuring air temperature within said tire;
converting said air pressure into a temperature compensated air pressure corresponding to said temperature;
determining temporal fluctuation of said temperature compensated air pressure;
generating an alarm signal when said temporal fluctuation of said temperature compensated air pressure exceeds an air pressure threshold value, wherein at least one additional parameter which influences air pressure in said tire is measured; and
updating determined temporal fluctuation of said temperature compensated air pressure according to said measured additional parameter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for detecting air pressure drop in a tire, comprising the steps of:
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measuring air pressure with said tire;
measuring air temperature within said tire;
converting said air pressure into a temperature compensated air pressure corresponding to said temperature;
determining temporal fluctuation of said temperature compensated air pressure;
generating an alarm signal when said air pressure fluctuates in a predetermined way wherein deviations of at least two consecutively measured temperature compensated air pressure values are stored together with respective times when respective deviations exceed a predetermined first threshold value, a sum of the stored deviations within a predetermined time interval is calculated, and said alarm signal is generated when said sum exceeds a predetermined second threshold value. - View Dependent Claims (20, 21, 22, 23)
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24. A system for detecting air pressure drop in a tire, comprising:
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an air pressure sensor for detecting air pressure in said tire;
a temperature sensor for detecting air temperature in said tire;
an alarm generator for generating a human detectable alarm; and
an evaluating unit connected to said air pressure sensor, temperature sensor, and alarm generator;
said unit comprising;
means for evaluating signals from said air pressure and temperature sensors, means for converting measured air pressure values and temperature values into temperature compensated air pressure values, means for determining temporal fluctuations of said compensated air pressure values, means for causing an alarm to generate at said alarm generator when said temporal fluctuation exceeds an air pressure fluctuation threshold value, and means for decreasing said air pressure fluctuation threshold value with increasing deviation of said measured temperature compensated air pressure value by a predetermined temperature compensated air pressure reference value. - View Dependent Claims (25, 26, 27, 28)
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29. A system for detecting air pressure drop in a tire, comprising:
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an air pressure sensor for detecting air pressure in said tire;
a temperature sensor for detecting air temperature in said tire;
at least one additional sensor for measuring a parameter which influences air pressure in said tire;
an alarm generator for generating a human detectable alarm; and
an evaluating unit in electrical communication with said air pressure sensor, temperature sensor, at least one additional sensor, and alarm generator, said unit comprising means for;
converting measured air pressure values and temperature values into temperature compensated air pressure values, determining temporal fluctuation of said compensated air pressure values, causing alarm signals to be generated in said alarm generator when said temporal fluctuation exceeds a threshold value, and correcting said temporal fluctuation in accordance with said parameter. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A system for the detection of a pressure drop in a tire, comprising:
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an air pressure sensor for detecting air pressure in said tire;
a temperature sensor for detecting temperature in said tire;
an alarm generator for generating a human detectable alarm; and
an evaluating unit in electrical communication with said air pressure sensor, said temperature sensor, and alerting unit, said unit comprising means for;
converting measured air pressure values and temperature values into temperature compensated air pressure values and producing an alarm signal when said temperature compensated air pressure fluctuates in a predetermined way;
storing deviations of two temperature compensated air pressure values measured in predetermined time intervals together with associated times thereof; and
when a deviation exceeds a predetermined first threshold value, further calculating a sum of stored deviations of a time interval whose length is predetermined and producing an alarm signal at said alarm generator when said sum exceeds a predetermined second threshold value. - View Dependent Claims (38, 39, 40, 41)
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Specification