US4567460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing device apparatus and method for tire pressure of automotive vehicle wheels
Assignee: Bayerische Motoren Werke AG
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Filing: 1982-12-20
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Granted: 1986-01-28
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Expires: 2002-12-20
Abstract
Abstract In a testing apparatus and method for the tire pressure of automotive vehicle wheels, individual testing units for each wheel are arranged outside of the wheels at their suspension members. Only a single wheel is provided with an additional calibrating means for an exact tire pressure determination, in order to provide a calibrating standard for the relative measurement of the tire pressures of the wheels which can be performed with the aid of the testing units to produce a warning indication of low tire pressure.
Inventors
- 👤 Eugen Gebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:17
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A testing apparatus for wheeled road vehicles having suspension members for the wheels comprising first means mounted at the suspension members for sensing a characteristic of the suspension member adjacent each wheel with respect to the road, calibration means for sensing tire pressure of at least the tire of one of said wheels, and second means responsive to an output signal from said first means and to a signal from said calibration means for producing an output warning signal.
Claim 2
Dependent Claim
79 words
A testing apparatus for wheeled road vehicles having suspension members for the wheels comprising first means mounted at the suspension members for sensing a characteristic of the suspension member adjacent each wheel with respect to the road, calibration means for sensing tire pressure of at least the tire of one of said wheels, and second means responsive to an output signal from said first means and to a signal from said calibration means for producing an output warning signal.
Claim 3
Dependent Claim
39 words
A testing apparatus in accordance with claim 1, wherein said calibration means comprises means for measuring inductance, and means attached to a wheel for varying the measured indication of inductance in response to a tire pressure of said wheel.
Claim 4
Dependent Claim
21 words
A testing apparatus in accordance with claim 2, wherein the means attached to the wheel is attached to a rear wheel.
Claim 5
Dependent Claim
50 words
A testing apparatus in accordance with claim 1, wherein said calibration means comprises first coil means mounted at a vehicle wheel of variable inductance for sensing tire pressure, and second coil means mounted at a suspension member of said vehicle for generating a signal representing a change in tire pressure.
Claim 6
Dependent Claim
17 words
A testing apparatus in accordance with claim 1, wherein the first means comprises means for measuring acceleration.
Claim 7
Dependent Claim
38 words
A testing apparatus in accordance with claim 1, wherein said second means comprises means for determining a change in air pressure in a tire of a wheel in response to a change in oscillation frequency of said characteristic.
Claim 8
Dependent Claim
37 words
A testing apparatus in accordance with claim 1, wherein said second means comprises means for determining a change in air pressure in a tire of a wheel in response to a change in amplitude of said characteristic.
Claim 9
Dependent Claim
35 words
A testing apparatus in accordance with claim 1, further comprising third means in response to said output signal and a signal representing an established limit for generating a warning signal indicating a low tire pressure.
Claim 10
Independent Claim
80 words
A method for determining air pressure of a tire on a wheeled vehicle having a plurality of wheels and a vehicle body comprising sensing at said plurality of wheels a characteristic of vehicle motion with respect to a road surface to produce a first signal, sensing additionally a characteristic of motion of one of said wheels with respect to the vehicle body to produce a second signal, and generating a warning signal in response to said first and second signals.
Claim 11
Independent Claim
80 words
A method for determining air pressure of a tire on a wheeled vehicle having a plurality of wheels and a vehicle body comprising sensing at said plurality of wheels a characteristic of vehicle motion with respect to a road surface to produce a first signal, sensing additionally a characteristic of motion of one of said wheels with respect to the vehicle body to produce a second signal, and generating a warning signal in response to said first and second signals.
Claim 12
Dependent Claim
42 words
A method in accordance with claim 9, wherein the generating step comprises comparing said first and second sensed signals to produce a difference signal, and comparing said difference signal with a signal representing a tire pressure limit to produce said warning signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |