EP0695653A1
Expired / Lapsed
EP
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Tire resonance frequency detecting apparatus
Assignee: Denso Corp
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Filing: 1995-08-04
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Granted: —
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Expires: 2015-08-04
Abstract
Abstract Tire vibration frequency components of a left-hand and a right-hand tires (1a ∼ 1d) are derived from wheel speed signals (3a ∼ 3d) while a vehicle is traveling. A noise frequency component is detected based on a correlation between the vibration frequency components of the left-hand and right-hand tires (1a ∼ 1d) and the noise frequency component is reduced from the vibration frequency component. Thereafter, resonance frequencies of each tire are detected with using the vibration frequency component from which the noise frequency component is reduced and tire air pressures are detected on the basis of the resonance frequencies.
Inventors
- 👤 Yoshihiro Nishikawa
- 👤 Ikuo Hayashi
- 👤 Takeyasu Taguti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 10:52
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/06; B60C23/061; B60C23/062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
A tire resonance frequency detecting apparatus for a vehicle having a left-hand tire (1b, 1d) and a right-hand tire (1a, 1c), comprising: first output means (S10A, S30A) for outputting a vibration frequency component of said left-hand tire during said vehicle travelling; second output means (S10B, S30B) for outputting a vibration frequency component of said right-hand tire during said vehicle travelling; noise detecting means (S42A, S42B) for detecting a noise frequency component other than a resonance frequency caused by a tire air pressure from said vibration frequency components of said left-hand tire and said right-hand tire on the basis of a correlation between said vibration frequency components of each tire output by said first output means (S10A, S30A) and said second output means (S10B, S30B); noise removing means (S43A, S43B) for removing said noise frequency component detected by said noise detecting means from the vibration frequency components of said each tire; and tire resonance frequency detecting means (S70A, S70B) for detecting a tire resonance frequency from said vibration frequency component of said each tire from which said noise frequency component is removed by said noise removing means.
Claim 2
Dependent Claim
63 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, wherein said noise detecting means (S42A, S42B) determines said each vibration frequency component as said noise frequency component in a case where said correlation between said vibration frequency components output by said first output means (S10A, S30A) and said second output means (S10B, S30B) statistically has a specified inherent value.
Claim 3
Dependent Claim
49 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 2, wherein said correlation uses a phase lag between said vibration frequency component output by said first output means (S10A, S30A) and said vibration frequency component output by said second output means (S10B, S30B) at each frequency.
Claim 4
Dependent Claim
63 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 3, wherein said noise detecting means (S42A, S42B) detects said each vibration frequency component as said noise frequency component in a case where said phase lag between said vibration frequency components output by said first output means (S10A, S30A) and said second output means (S10B, S30B) is within a predetermined range.
Claim 5
Dependent Claim
59 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 3, wherein said noise detecting means (S42A, S42B) detects said each vibration frequency component as said noise frequency component in a case where said each vibration frequency component output by said first output means (S10A, S30A) and said second output means (S10B, S30B) has the same phase.
Claim 6
Dependent Claim
40 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 2, wherein said correlation uses coherence functions on said left-hand tire (1b, 1d) and said right-hand tire (1a, 1c) which include a tire vibration component at each frequency.
Claim 7
Dependent Claim
41 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, wherein said noise removing means (S43A, S43B) suppresses an influence of said noise frequency component by compensating a power spectrum of said noise frequency component at each frequency.
Claim 8
Dependent Claim
64 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, wherein said first output means (S10A, S30A) and said second output means (S10B, S30B) respectively output said vibration frequency component of said each tire by performing a fast Fourier transform operation with respect to wheel speed signals from wheel speed sensors (2a∼2d, 3a∼3d) installed for said each tire of said vehicle.
Claim 9
Dependent Claim
38 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, wherein said noise removing means (S43A, S43B) removes said noise frequency component by deleting a power spectrum of said noise frequency component at each frequency.
Claim 10
Dependent Claim
63 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, further comprising: tire air pressure detecting means (S80A, S80B) for detecting air pressures of each tire on the basis of said tire resonance frequency components derived from said vibration frequency components of said each tire from which said noise frequency component is removed by said noise removing means (S43A, S43B).
Claim 11
Dependent Claim
69 words
A tire resonance frequency detecting apparatus for a vehicle according to claim 1, further comprising: tire air pressure detecting means (S80A, S80B) for detecting air pressures of each tire on the basis of tire spring constants which correspond to said tire resonance frequency and are detected from said vibration frequency components of each tire from which said noise frequency component is removed by said noise removing means (S43A, S43B).
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WO1988008593A1
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EP0421065A2
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