Method and system for ascertaining the emergency running condition of a pneumatic tire
First Claim
1. A method for ascertaining the emergency running condition of a pneumatic tire on a motor vehicle, the method comprising:
- producing a permanently present first periodic oscillation in at least each axle proportional to a wheel rotation speed as a speed output signal;
feeding the speed output signal to a signal processing device, wherein in an emergency running condition, the process further comprises;
superimposing, on one of the first periodic oscillation and the speed output signal, at least one separately defined periodic oscillation related to the emergency running condition and proportional to an emergency running condition wheel rotation speed;
detecting the superimposition of the first periodic oscillation with the at least one separately defined periodic oscillation characteristic of the emergency running condition in the signal processing device; and
producing a warning signal.
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Accused Products
Abstract
System and method for ascertaining the emergency running condition of a pneumatic tire on a motor vehicle. The system includes at least one sensor device arranged at least on each axle. The at least one sensor device is 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 includes one of an active and a passive magnetic field sensor being mounted to one of rotate with the tire and be stationary. The transmitter device is arranged complementary to the at least one passive and active magnetic field sensor and is adapted to produce a periodic magnetic field change in proportion to the wheel rotation speed in a detection range. At least one signal processing device is used for processing and evaluating the speed output signal. A transmission and a display device are used for at least one of the transmission and the display of the speed output signal, and for one of the transmission and the display of at least one of the output control and the warning signal. An emergency running device is arranged on the vehicle wheel.
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Citations
61 Claims
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1. A method for ascertaining the emergency running condition of a pneumatic tire on a motor vehicle, the method comprising:
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producing a permanently present first periodic oscillation in at least each axle proportional to a wheel rotation speed as a speed output signal;
feeding the speed output signal to a signal processing device, wherein in an emergency running condition, the process further comprises;
superimposing, on one of the first periodic oscillation and the speed output signal, at least one separately defined periodic oscillation related to the emergency running condition and proportional to an emergency running condition wheel rotation speed;
detecting the superimposition of the first periodic oscillation with the at least one separately defined periodic oscillation characteristic of the emergency running condition 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, 20, 21, 22, 23, 24, 25)
calculating a wheel velocity for a stipulated time interval from the speed output signal;
comparing the wheel velocity with one of at least one reference wheel velocity and at least one threshold value, wherein the speed output signal is represented with an oscillation, and the process further comprises;
ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
within defined count times TL containing several successive wheel rotation angles, calculating and storing an average wheel rotation velocity for at least one wheel rotation within the count times from the times ascertained for the partial rotations; and
comparing one of average wheel rotation velocities and their course with the at least one reference wheel velocity or the at least one threshold value, wherein, when the at least one reference wheel velocity or the at least one threshold value is exceeded by the average wheel rotation velocity or the their coarse, a warning signal is activated.
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18. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
calculating and storing an average from several such successively ascertained times for at least one wheel rotation;
ascertaining deviations between the ascertained and stored times and the calculated and stored average; and
comparing the ascertained deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the ascertained deviations, a warning signal is activated.
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19. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
ascertaining a pattern of the corresponding times for partial rotations of the wheel using a pattern recognition process; and
comparing the ascertained pattern with one of a reference pattern and at least one threshold value, wherein, when the ascertained pattern deviates from the reference pattern or the at least one threshold value, a warning signal is activated.
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20. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
ascertaining and storing frequencies for the corresponding times for partial rotations of the wheel with the aid of at least one computer unit;
calculating and storing reciprocals of the frequencies;
calculating and storing averages of the frequencies; and
ascertaining and storing deviations between the reciprocals and the averages;
comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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21. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
ascertaining and storing a frequency spectrum of the corresponding times for partial rotations of the wheel with the aid of at least one computer unit;
ascertaining power spectral densities by performing a frequency analysis on the frequency spectrum;
integrating and storing the power spectral densities over certain selected frequency intervals with the aid of at least one computer unit; and
comparing the integrated power spectral densities with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the integrated power spectral densities, a warning signal is activated.
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22. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
calculating and storing momentary wheel velocities from the corresponding times for the partial rotations of the wheel with the aid of at least one computer unit;
calculating and storing averages from the momentary wheel velocities;
ascertaining and storing deviations between the momentary wheel velocities and the averages; and
comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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23. The method of claim 8, wherein, in the signal processing device, the process further comprises:
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ascertaining and storing for several successive and defined wheel rotation angles, corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles;
calculating and storing momentary wheel accelerations from the corresponding times for partial rotations of the wheel with the aid of at least one computer unit;
calculating and storing averages of the momentary wheel accelerations;
ascertaining deviations between the momentary wheel accelerations and one of the averages and a zero value; and
comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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24. The method of claim 23, wherein the deviations are ascertained between the momentary wheel accelerations and zero values, the deviations being represented as time differences between the zero values which are measured in one of at least one time control device and at least one timer.
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25. The method of claim 24, wherein the time differences undergo a rotation-synchronous averaging before being further processed, such that an average is obtained over several wheel rotations from the zero value times measured with respect to one wheel rotation at equal time intervals or at equal rotation angle intervals, which average is then a basis for further signal processing.
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26. A system for ascertaining the emergency running condition of a pneumatic tire on a motor 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 in a detection range;
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 transmission and a display device for at least one of the transmission and the display of the speed output signal, and for one of the transmission and the display of at least one of the output control and the warning signal; and
an emergency running device arranged on the vehicle wheel which, in an emergency running condition, is adapted to produce at least one separately defined periodic oscillation related to the emergency running condition and proportional to the emergency running condition wheel rotation speed, wherein, in an emergency running condition, the at least one separately defined periodic oscillation is superimposed on one of the first periodic oscillation and or the speed output signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measures corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
at least one counting device connected in parallel to one of the at least one time control device and the at least one timer and receiving the single-pulse signal, the at least one counting device ascertaining one of the number of single pulses obtained and measured times within a defined count time TL;
at least one storage devices for storing the measured corresponding times for partial rotations of the wheel and the number of single pulses obtained within several successive count times TL;
a computer circuit for calculating and storing a average wheel rotation velocity within the count times TL for at least one wheel rotation from the times ascertained for the partial rotations and their numbers within the count times TL; and
a comparator for comparing one of the average wheel rotation velocity or their course with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the averaged wheel rotation velocity or their coarse, a warning signal is activated.
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40. The system of claim 26, wherein the speed output signal is an input signal for the signal processing device and the signal processing device further comprises:
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one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measures corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
at least one storage device for storing the measured corresponding times for partial rotations of the wheel;
a computer circuit for calculating an average value from the measures corresponding times for partial rotations of the wheel and for calculating deviations of the measures corresponding times for partial rotations of the wheel from the average value; and
a comparator for comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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41. The system of claim 26, wherein the speed output signal is an input signal for the signal processing device and the signal processing device further comprises:
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one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measure corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
at least one computer unit for calculating frequencies of the measured corresponding times for partial rotations of the wheel and taking the reciporocal of the frequencies;
at least one storage device for storing the calculated frequencies;
a computer circuit for calculating an average value of several successively calculated frequencies and for calculating deviations of the calculated frequencies from the average value; and
a comparator for comparing the deviations with one of at least one reference value and at least one threshold value, wherein when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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42. The system of claim 26, wherein the speed output signal is an input signal for the signal processing device and the signal processing device further comprises:
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one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measure corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
at least one computer unit for carrying out a frequency analysis of a frequency spectrum of the measured corresponding times for partial rotations of the wheel as a function of a time or time signal and for ascertaining power spectral densities;
at least one computer unit for integrating the power spectral densities ascertained over certain selected frequency intervals;
at least one storage device for storing several successively ascertained integrals; and
a comparator for comparing the ascertained integrals with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the ascertained integrals, a warning signal is activated.
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43. The system of claim 26, wherein the speed output signal is an input signal for the signal processing device and the signal processing device further comprises:
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one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measure corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
a computer circuit for calculating momentary wheel velocities of the measured corresponding times for partial rotations of the wheel;
at least one storage device for storing calculated momentary wheel velocities;
a computer circuit for calculating an average value of the momentary wheel velocities and for calculating deviations of the momentary wheel velocities from the average value; and
a comparator for comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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44. The system of claim 26, wherein the speed output signal is an input signal for the signal processing device and the signal processing device further comprises:
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one of at least one filter and at least one low-pass filter for filtering out high-frequency noise portions of the speed output signal;
one of at least one comparator circuit and at least one Schmitt trigger for converting the speed output signal into a single-pulse square wave signal;
one of at least one time control device and at least one timer which, for several successive and defined wheel rotation angles, measure corresponding times for partial rotations of the wheel determined by the defined wheel rotation angles, with the times being measured by ascertaining time differences between two decreasing or increasing edges of the square wave signal that correlate with the times for the partial rotations;
a computer circuit for calculating momentary wheel accelerations of the measured corresponding times for partial rotations of the wheel;
at least one storage device for storing calculated momentary wheel accelerations;
a computer circuit for calculating an average value of the momentary wheel accelerations and for calculating deviations of the momentary wheel accelerations from the average value; and
a comparator for comparing the deviations with one of at least one reference value and at least one threshold value, wherein, when the at least one reference value or the at least one threshold value is exceeded by the deviations, a warning signal is activated.
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45. The system of claim 26, wherein the speed output signal is fed from some portion of an anti-locking braking system.
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46. The system of claim 26, wherein an anti-locking braking system is coupled to the signal processing device.
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47. A method for ascertaining an emergency running 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 comprising an emergency running device which produces at least one periodic oscillation characteristic of an emergency running condition when the wheel experiences substantial damage or a substantial loss of air pressure, 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 emergency running condition. - View Dependent Claims (48, 49, 50)
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51. A method for ascertaining an emergency running 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 comprising an emergency running device which produces at least one periodic oscillation characteristic of an emergency running condition when the wheel experiences substantial damage or a substantial loss of air pressure, 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.
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52. A system for ascertaining an emergency running condition 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 storage device connected to the time control devices;
a computer circuit connected to the storage device;
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 the emergency running condition. - View Dependent Claims (53, 54, 55, 56, 57)
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58. A system for ascertaining the emergency running condition 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 computer utilizing a Fourier transform connected to each time control devices;
a computer utilizing an integral connected to the computer utilizing the Fourier transform;
a storage device connected to the computer utilizing the integral;
a comparator connected to the storage device; 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 an emergency running condition. - View Dependent Claims (59, 60, 61)
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Specification