Process and system for determining the onset of tread rubber separations of a pneumatic tire on a vehicle
First Claim
1. A method of detecting an onset of tread rubber separation of a pneumatic tire on a vehicle, the method comprising:
- producing a permanent first periodic vibration, in at least one of each axle and each wheel, proportional to a wheel rotational speed as a speed output signal;
feeding the speed output signal to a signal processing device;
wherein in the onset of tread rubber separation, the method further comprises;
superimposing, on a first vibration or the speed output signal, at least one separately defined periodic vibration characteristic of the onset of tread rubber separation and proportional to the wheel rotational speed;
detecting the superimposition of the first periodic vibration with the at least one separately defined periodic vibration characteristic of the onset of tread rubber separation in the signal processing device; and
producing a warning signal.
1 Assignment
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Accused Products
Abstract
System and method of detecting an onset of tread rubber separation of a pneumatic tire on a vehicle, in which a permanent first periodic vibration is produced, in at least one of each axle and each wheel, that is proportional to a wheel rotational speed as a speed output signal. The speed output signal is fed to a signal processing device, wherein in the onset of tread rubber separation, there is provided the superimposition on a first vibration or the speed output signal, at least one separately defined periodic vibration characteristic of the onset of tread rubber separation and proportional to the wheel rotational speed. The superimposition of the first periodic vibration with the at least one separately defined periodic vibration characteristic of the onset of tread rubber separation is detected in the signal processing device and a warning signal is produced.
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Citations
38 Claims
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1. A method of detecting an onset of tread rubber separation of a pneumatic tire on a vehicle, the method comprising:
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producing a permanent first periodic vibration, in at least one of each axle and each wheel, proportional to a wheel rotational speed as a speed output signal;
feeding the speed output signal to a signal processing device;
wherein in the onset of tread rubber separation, the method further comprises;
superimposing, on a first vibration or the speed output signal, at least one separately defined periodic vibration characteristic of the onset of tread rubber separation and proportional to the wheel rotational speed;
detecting the superimposition of the first periodic vibration with the at least one separately defined periodic vibration characteristic of the onset of tread rubber separation in the signal processing device; and
producing a warning signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for ascertaining an onset of tread rubber separation of a pneumatic tire on a vehicle, the system comprising:
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at least one sensor device arranged at least on each axle, the at least one sensor device adapted to supply a permanently present first periodic oscillation proportional to a wheel rotation speed as a speed output signal;
the at least one sensor device comprising one of an active and a passive magnetic field sensor being mounted to one of rotate with the tire and be stationary;
the at least one sensor device further comprising one of a magnetically active and passive transmitter device which rotates at the wheel rotation speed relative to a magnetic field sensor, the transmitter device being arranged complementary to the at least one passive and active magnetic field sensor and adapted to produce a periodic magnetic field change in proportion to the wheel rotation speed;
at least one signal processing device for processing and evaluating the speed output signal, the signal processing device being adapted to produce one of an output control and a warning signal;
a display device for displaying at least one of the output control and the warning signal; and
the system detecting at least one separately defined periodic oscillation related to the onset of tread rubber separation in proportion to the permanently present first periodic oscillation, wherein, in the onset of tread rubber separation, the at least one separately defined periodic oscillation is superimposed on at least one of the permanently present first periodic oscillation and the speed output signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33)
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30. A method for ascertaining an onset of tread rubber separation condition of a pneumatic tire on a motor vehicle, the method comprising:
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sensing a permanently present first periodic oscillation proportional to a wheel rotation speed of at least one wheel of the motor vehicle, the at least one wheel being adapted to produce at least one periodic oscillation characteristic of the onset of tread rubber separation condition when the wheel experiences any tread rubber separation, the sensing being performed by at least one sensor device disposed adjacent the at least one wheel;
feeding a speed output signal from the at least one sensor device to at least one filter which filters out high-frequency noise portions of the speed output signal;
converting the speed output signal into a square wave signal of single pulses using one of at least comparator circuit and at least one Schmitt trigger;
processing the single pulses using at least one processing device and producing at least one output;
storing the at least one output in a storage device;
subjecting the at least one output to a calculation with a computer circuit to produce at least one value;
comparing the at least one value with one of at least one reference value and at least one threshold value using a comparator; and
producing at least one warning signal on a display device when the at least one value exceeds the at least one reference value or the at least one threshold value, wherein the at least one warning signal is produced when the tire experiences the onset of tread rubber separation.
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34. A method for ascertaining an onset of tread rubber separation of a pneumatic tire on a motor vehicle, the method comprising:
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sensing a permanently present first periodic oscillation proportional to a wheel rotation speed of at least one wheel of the motor vehicle, the at least one wheel being capable of producing at least one periodic oscillation characteristic of the onset of tread rubber separation when the wheel experiences any tread rubber separation, the sensing being performed by at least one sensor device disposed adjacent the at least one wheel;
feeding a speed output signal from the at least one sensor device to at least one filter which filters out high-frequency noise portions of the speed output signal;
converting the speed output signal into a square wave signal of single pulses using one of at least one comparator circuit and at least one Schmitt trigger;
processing the single pulses using one of at least one time control device and at least one timer and producing a frequency spectrum;
feeding the frequency spectrum to a computer and performing a frequency analysis using a Fourier transform to ascertain power spectral densities;
integrating the power spectral densities using a computer and an integral so as to produce ascertained integrals;
feeding the ascertained integrals to at least one a storage device;
comparing the ascertained integrals with one of at least one reference value and at least one threshold value using a comparator; and
producing at least one warning signal on a display device when the ascertained integrals exceed the at least one reference value or the at least one threshold value, wherein the at least one warning signal is produced when the tire experiences the emergency running condition. - View Dependent Claims (36)
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35. A system for ascertaining an onset of tread rubber separation of a pneumatic tire on a motor vehicle, the system comprising:
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a plurality of wheel sensor devices disposed on the vehicle, each wheel sensor device comprising;
one of an active or passive magnetic field sensor being disposed adjacent each wheel of the vehicle, each wheel sensor device supplying a permanently present first periodic oscillation in proportion to a wheel rotation speed in the form of a speed output signal;
a signal processing device receiving the speed output signal, the signal processing device comprising;
a plurality of low-pass filters for filtering out high-frequency noise portions of the speed output signal;
a Schmitt trigger connected to each low-pass filter;
a time control device connected to each Schmitt trigger;
an accumulator connected to the time control devices;
a computer circuit connected to the accumulator;
a comparator connected to the computer circuit; and
a display connected to the comparator, wherein the signal processing device processes and evaluates the speed output signal, the signal processing device being adapted to produce a warning signal on the display device when the wheel experiences any tread rubber separation.
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37. A system for ascertaining an onset of tread rubber separation of a pneumatic tire on a motor vehicle, the system comprising:
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a plurality of wheel sensor devices disposed on the vehicle, each wheel sensor device comprising;
one of an active or passive magnetic field sensor being disposed adjacent each wheel of the vehicle, each wheel sensor device supplying a permanently present first periodic oscillation in proportion to a wheel rotation speed in the form of a speed output signal;
a signal processing device receiving the speed output signal, the signal processing device comprising;
a plurality of low-pass filters for filtering out high-frequency noise portions of the speed output signal;
a Schmitt trigger connected to each low-pass filter;
a time control device connected to each Schmitt trigger;
an ALU connected to each time control device;
an accumulator connected to each ALU;
a computer circuit connected to the accumulator;
a comparator connected to the computer circuit; and
a display connected to the comparator, wherein the signal processing device processes and evaluates the speed output signal, the signal processing device being adapted to produce a warning signal on the display device when the wheel experiences any tread rubber separation.
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38. A system for ascertaining an onset of tread rubber separation of a pneumatic tire on a motor vehicle, the system comprising:
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a plurality of wheel sensor devices disposed on the vehicle, each wheel sensor device comprising;
one of an active or passive magnetic field sensor being disposed adjacent each wheel of the vehicle, each wheel sensor device supplying a permanently present first periodic oscillation in proportion to a wheel rotation speed in the form of a speed output signal;
a signal processing device receiving the speed output signal, the signal processing device comprising;
a plurality of low-pass filters for filtering out high-frequency noise portions of the speed output signal;
a Schmitt trigger connected to each low-pass filter;
a time control device connected to each Schmitt trigger;
a first ALU connected to each time control device;
a second ALU connected to each first ALU;
an accumulator connected to each second ALU;
a comparator connected to the accumulator; and
a display connected to the comparator, wherein the signal processing device processes and evaluates the speed output signal, the signal processing device being adapted to produce a warning signal on the display device when the wheel experiences any tread rubber separation.
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Specification