Patent EP0022096A2 successfully refreshed from Google Patents.
EP0022096A2
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EP
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Device for indicating air pressure in vehicle tires
Assignee: Individual
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Filing: 1980-03-25
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Granted: —
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Expires: 2000-03-25
Abstract
Abstract The invention relates to a device for indicating air pressure change in vehicle tires. According to the invention, a transducer is mounted fixed in the area of the hub of the wheel in question, which transducer continuously is affected by the changes in the dynamic behaviour of the tire which occur at driving owing to dropping air pressure. The output signal from the transducer is processed in an electronic unit for forming a secondary signal, which is an expression for the vertical acceleration component in the output signal. When the secondary signal deviates by an amount critical for the driving safety from a nominal value, warning is released.
Inventors
- 👤 Brajnandan Sinha
- 👤 Sven Erik Tiberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:35
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
206 words
A device for indicating change of the pressure in vehicle tires (D1, D2), comprising transducers (G1 and, respectively, G2), which are located fixed on wheel suspension means, preferably adjacent the respective hub, and continuously affected by the dynamic behaviour of the running wheel, and an electronic unit for releasing a warning signal (L) when the dynamic properties of the wheel depending on its tire pressure pass a predetermined limit, characterized in that the transducers are accelerometers (G1 and G2), which with their outputs are connected to the electronic unit (FD, DVR), which transforms the primary signals (k 1 . z 1 and, respectively, k 1 · z 2 ) received from the accelerometers and decreasing with dropping tire pressure to secondary signals u(ω 1 ) and, respectively, u(ω 2 ) and u(d 1 ) and, respectively, uCd 2 ) expressing the vertical acceleration component valid for the respective tire at a certain frequency or frequency range, which secondary signals are compared either with each other (in M ω , M d ) or individually with a reference value, in such a manner, that a change of the difference at such a comparison releases (via I) a warning signal when the difference amounts to a preset value.
Claim 2
Independent Claim
206 words
A device for indicating change of the pressure in vehicle tires (D1, D2), comprising transducers (G1 and, respectively, G2), which are located fixed on wheel suspension means, preferably adjacent the respective hub, and continuously affected by the dynamic behaviour of the running wheel, and an electronic unit for releasing a warning signal (L) when the dynamic properties of the wheel depending on its tire pressure pass a predetermined limit, characterized in that the transducers are accelerometers (G1 and G2), which with their outputs are connected to the electronic unit (FD, DVR), which transforms the primary signals (k 1 . z 1 and, respectively, k 1 · z 2 ) received from the accelerometers and decreasing with dropping tire pressure to secondary signals u(ω 1 ) and, respectively, u(ω 2 ) and u(d 1 ) and, respectively, uCd 2 ) expressing the vertical acceleration component valid for the respective tire at a certain frequency or frequency range, which secondary signals are compared either with each other (in M ω , M d ) or individually with a reference value, in such a manner, that a change of the difference at such a comparison releases (via I) a warning signal when the difference amounts to a preset value.
Claim 3
Dependent Claim
59 words
A device as defined in claim 1, characterized i n that each accelerometer (G1,G2) consists of a piezo element, which projects vertically from the fixed suspension (U1 and, respectively, U2) of the wheel and carries at its end a weight, which piezo element at acceleration of the attachment point in vertical.direction is deformed and thereby emits an electric signal.
Claim 4
Dependent Claim
200 words
A device as defined in claim 1 or 2 for comparing tires (D1,D2) in pairs, characterized in that it comprises an amplifier and rectifier circuit (FD1 and, respectively, FD2) for amplifying and rectifying, possibly smoothing, the signal (k 1 · z l and, respectively, k 1 · z 2 ) coming from each accelerometer (G1,G2), a frequency voltage transformer (01 and, respectively, 02) for transforming the output signal (S1 and, respectively, S2) of the circuit to a first voltage u(ω 1 ) and, respectively, u(ω 2 ) corresponding to the natural oscillation frequency of the tire (Dl and, respectively, D2), a derivator (DVR 1 and, respectively, DVR2) for derivating the output signal (S1 and, respectively, D2) for forming a second voltage u(d 1 ) and, respectively, u(d 2 ) corresponding to the attenuation of the tire, a memory (M ω , M d ) for receiving and mutually comparing the first and the second voltages from the tire pair, and a unit such as an integrator (I) for receiving the respective voltage differences (u(ω 1 -ω 2 ) and, respectively, -u(d 1 -d 2 )) and releasing the warning signal (L) at unpermissible deviations in natural oscillation frequency and/or attenuation.
Claim 5
Dependent Claim
72 words
A sevice as defined in claim 1 or 3 at mutual comparison between the frequency and attenuation components, characterized in that it comprises a band-pass filter (BP1 and, respectively, BP2) for restricting the output signal (k 1 . z 1 and, respectively, k 1 . z2) from the accelerometer (G1 and, respectively, G2) to a frequency range of the attenuation/oscillation frequency characteristic of the tire which strongly depends on the tire pressure.
Claim 6
Dependent Claim
61 words
A device as defined in claim 1 at comparison of the frequency and attenuation components with respective reference signals, characterized in that it comprises a band-pass filter for restricting a portion of the output signal (k 1 . 1) from the transducer (Gl) to a flat frequency range of the attenuation/oscillation frequency characteristic of the tire for forming the reference signal.
References Cited (Backward Citations)
No citation records indexed.
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