Device and method for monitoring the air pressure in the tires of a motor vehicle
First Claim
1. A device for monitoring an air pressure in vehicle tires, comprising:
- determining units configured to determine wheel speed variables characterizing wheel speeds of a motor vehicle;
a calculating unit operatively connected to said determining units and configured to calculate differential variables from the wheel speed variables;
an evaluation unit configured to evaluate the differential variables with respect to a setpoint value deviation, said evaluation unit generating a warning signal if the setpoint value deviation exceeds a first threshold value;
a measuring unit operatively connected to said evaluation unit, said measuring unit being configured to directly measure an air pressure in a tire of a wheel and configured to transmit a pressure variable characterizing the air pressure to said evaluation unit; and
said evaluation unit further generating a warning signal if a deviation of the pressure variable from a pressure setpoint value exceeds a second threshold value, said evaluation unit using a first tolerance range for a permitted setpoint value deviation of the differential variables, the first tolerance range representing a first pressure difference range, said evaluation unit further using a second tolerance range for a permitted setpoint value deviation of the pressure variable, the second tolerance range representing a second pressure difference range, the first pressure difference range being smaller than the second pressure difference range.
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Accused Products
Abstract
A device for monitoring air pressure in the tires of a vehicle includes devices for determining the wheel speed or other characteristic variables for the speed of the tires of the vehicle, a device for calculating differential variables on the basis of the wheel speed variables, a device for evaluating the differential variables with respect to a setpoint value deviation and for generating a warning signal if the setpoint value deviation exceeds a threshold value, and a device for directly measuring the air pressure in the tire of a wheel and for transferring an air pressure characteristic variable to the evaluation device. A warning signal is generated if the deviation of the air pressure characteristic variable with respect to a setpoint value exceeds a corresponding threshold value. A method of monitoring tire pressures is also provided.
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Citations
12 Claims
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1. A device for monitoring an air pressure in vehicle tires, comprising:
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determining units configured to determine wheel speed variables characterizing wheel speeds of a motor vehicle;
a calculating unit operatively connected to said determining units and configured to calculate differential variables from the wheel speed variables;
an evaluation unit configured to evaluate the differential variables with respect to a setpoint value deviation, said evaluation unit generating a warning signal if the setpoint value deviation exceeds a first threshold value;
a measuring unit operatively connected to said evaluation unit, said measuring unit being configured to directly measure an air pressure in a tire of a wheel and configured to transmit a pressure variable characterizing the air pressure to said evaluation unit; and
said evaluation unit further generating a warning signal if a deviation of the pressure variable from a pressure setpoint value exceeds a second threshold value, said evaluation unit using a first tolerance range for a permitted setpoint value deviation of the differential variables, the first tolerance range representing a first pressure difference range, said evaluation unit further using a second tolerance range for a permitted setpoint value deviation of the pressure variable, the second tolerance range representing a second pressure difference range, the first pressure difference range being smaller than the second pressure difference range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for monitoring an air pressure in tires of a motor vehicle, the method which comprises:
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sensing wheel speed variables for wheels of a motor vehicle, the wheel speed variables characterizing wheel speeds;
forming differential variables from the wheel speed variables;
generating a warning signal if the differential variables deviate from a first setpoint value by more than a first threshold value;
directly measuring an air pressure in a tire of one of the wheels for providing a measured air pressure value;
generating a warning signal if the measured air pressure value deviates from a second setpoint value by more than a second threshold value; and
setting a first tolerance range for a setpoint value deviation of the differential variables and setting a second tolerance range for a setpoint value deviation of a variable characterizing an air pressure in a tire such that the first tolerance range represents a first pressure difference range and the second tolerance range represents a second pressure difference range and such that the first pressure difference range is smaller than the second pressure difference range. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification