Method for indirectly monitoring tire pressure and tire pressure monitoring system
First Claim
1. A method for indirectly monitoring tire pressure or for detecting damage to a wheel suspension system, said method comprising the steps of:
- determining a pressure loss detection variable (DVE) by an analysis of an oscillation behavior of a wheel of a motor vehicle,detecting a pressure loss at a tire of a wheel or damage to the wheel suspension system by comparing a currently determined pressure loss detection variable (DVEcur) with a learnt pressure loss detection variable (DVEsetp), wherein at least two dimensional variables (e1, e2, e3), representing a torsional and a vertical dimension for the value of a frequency (fnat1, fnat2, fnat3) or of a frequency range (flower, fupper, Δ
fnati) in an oscillation behavior of the wheel, are determined from a wheel speed signal (w) of the wheel, andwherein the pressure loss detection variable (DVE) is formed from the two dimensional variables (e1, e2, e3).
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Abstract
A method for indirectly monitoring tire pressure or for detecting damage to a wheel suspension, wherein a pressure loss detection variable (DVE) is determined using an analysis of a vibratory behavior of a wheel of a motor vehicle, and a pressure loss in the tire of the wheel or damage to the wheel suspension is detected by comparing a momentarily determined pressure loss detection variable (DVEakt) to a learned pressure loss detection variable (DVEsoll), wherein at least two dimensional variables are determined from a wheel speed signal (w) of the wheel, each representing a dimension for the extent of a frequency or a frequency range in the vibratory behavior of the wheel, and that the pressure loss detection variable (DVE) is derived from the two dimensional variables (e1, e2, e3), particularly from a ratio of the two dimensional variables (e2/e3), and a tire pressure monitoring system.
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Citations
20 Claims
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1. A method for indirectly monitoring tire pressure or for detecting damage to a wheel suspension system, said method comprising the steps of:
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determining a pressure loss detection variable (DVE) by an analysis of an oscillation behavior of a wheel of a motor vehicle, detecting a pressure loss at a tire of a wheel or damage to the wheel suspension system by comparing a currently determined pressure loss detection variable (DVEcur) with a learnt pressure loss detection variable (DVEsetp), wherein at least two dimensional variables (e1, e2, e3), representing a torsional and a vertical dimension for the value of a frequency (fnat1, fnat2, fnat3) or of a frequency range (flower, fupper, Δ
fnati) in an oscillation behavior of the wheel, are determined from a wheel speed signal (w) of the wheel, andwherein the pressure loss detection variable (DVE) is formed from the two dimensional variables (e1, e2, e3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for indirectly monitoring tire pressure or for detecting damage to a wheel suspension system, said method comprising the steps of:
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determining a pressure loss detection variable (DVE) by an analysis of an oscillation behavior of a wheel of a motor vehicle, detecting a pressure loss at a tire of a wheel or damage to the wheel suspension system by comparing a currently determined pressure loss detection variable (DVEcur) with a learnt pressure loss detection variable (DVEsetp), wherein at least two dimensional variables (e1, e2, e3), which each represent a dimension for the value of a frequency (fnat1, fnat2, fnat3) or of a frequency range (flower, fupper, Δ
fnati) in an oscillation behavior of the wheel, are determined from a wheel speed signal (w) of the wheel, andwherein the pressure loss detection variable (DVE) is formed from the two dimensional variables (e1, e2, e3) wherein dimensional variables (e1, e2, e3) are determined for at least one of at least three different frequencies and at least three different frequency ranges, and wherein the three dimensional variables (e1, e2, e3) are used for at least one of pressure loss detection and damage detection. - View Dependent Claims (18, 19)
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20. A method for indirectly monitoring tire pressure or for detecting damage to a wheel suspension system, said method comprising the steps of:
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determining a pressure loss detection variable (DVE) by an analysis of an oscillation behavior of a wheel of a motor vehicle, detecting a pressure loss at a tire of a wheel or damage to the wheel suspension system by comparing a currently determined pressure loss detection variable (DVEcur) with a learnt pressure loss detection variable (DVEsetp), wherein at least two dimensional variables (e1, e2, e3), which each represent a dimension for the value of a frequency (fnat1, fnat2, fnat3) or of a frequency range (flower, fupper, Δ
fnati) in an oscillation behavior of the wheel, are determined from a wheel speed signal (w) of the wheelwherein the pressure loss detection variable (DVE) is formed from the two dimensional variables (e1, e2, e3), and wherein the pressure loss detection variable (DVE) is formed from a ratio between the two dimensional variables (e2/e3).
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Specification