Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1995-10-10
1998-10-27
Chilcot, Richard
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
73862629, E01C 2300, G01L 104
Patent
active
058279563
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a measuring wheel for detection of forces and moments between the rim and axle of a vehicle tire.
Operational stability tests and studies of vehicle movement dynamics represent essential elements in the development of vehicles, in particular in connection with safety-relevant functional groups, which include vehicle wheels and the chassis in which they are housed.
The studies in question are conducted on load test stands and in a vehicle. The prerequisite is that the forces occurring during driving be determined in a driving test.
Measuring wheels are employed for such a multicomponent power measurement at a rotating wheel. The power flux is guided through suitable measuring elements at an interface in the measuring wheel. Spring elements with measuring extension strips (DMS) or quartz sensors are commonly used for this purpose. The test values obtained are converted online or offline from the rotating coordinate system of the wheel to the coordinate system of the vehicle. It is also necessary for this purpose to determine the angular position of the wheel.
Exemplary embodiments of such measuring wheels and test execution details are presented, for example, in the report entitled "Multicomponent measuring hubs, potential applications, and results" and published in ATZ Automobiltechnische Zeitschrift 94 (1992), pages 44 to 53. The multicomponent wheel hub shown in detail as an example on page 45 consists of a modified rim, a wheel flange, a measuring sensor, and an electronic component. The measuring sensor performs the function of sensing dynamic forces and moments. The DMS applications necessary for determining these forces are executed on a specially designed aluminum component. The electronic component includes a constant-voltage amplifier for each measured quantity, a slip ring rotation transducer, and a resolver for determination of the wheel position (angle of rotation of the wheel about the Y axis).
A measuring wheel such as this presents the major disadvantage that neither statically nor dynamically does it correspond to an original wheel subsequently installed on the vehicle. The design of the test equipment considerably increases the weight of the wheel, and also the components projecting a relatively great distance forward (slip ring rotation transducer, resolver) exert an additional effect of moment during driving and create a hazard in public road traffic; these considerations make measurement during operation by customers impossible or at least extremely difficult. And so a description is given on page 46, Section 2.2, of this reference of the attempt made to compensate for these factors which distort the results.
While a modified multicomponent wheel measurement hub is described on page 53 in FIG. 24 (where the resolver is replaced by an incremental transmitter, the slip ring rotation transmitter by an infrared telemetry strip, and the power supply of the electronic component is inductive), one in which the total width of the measuring system was reduced, only to a certain extent have the disadvantages discussed above been eliminated.
In the light of what has been stated the object of the invention is to develop the state-of-the-art measuring wheel so that this wheel will correspond to the original wheel to the greatest extent possible with respect to its static properties and its dynamic behavior.
DE 39 37 966 A1 discloses the mounting of a part of a measurement signal transmitter on the inside of a wheel rim in order to correspond with a signal receiver on the body side by way of the pertinent transmitter, signal transmission being accomplished free of contact, as for example by inductance with a frequency-modulated signal or by way of slip rings. Of course, this prepublication describes not a measuring wheel but rather a process and a device for determination of the closed linkage relationships between vehicle tire and roadway, for which purpose at least one sensor is mounted in the tire tread to detect the patterns of local voltages, expansions, or strains in the
REFERENCES:
patent: 4046005 (1977-09-01), Goroski
patent: 4448083 (1984-05-01), Hayashi
patent: 4493220 (1985-01-01), Carignan et al.
patent: 5016470 (1991-05-01), Himmler
patent: 5193387 (1993-03-01), Hodate
patent: 5235850 (1993-08-01), Schurmann
Berichte Nr. 632, 1987, Mehrkomponenten-Messnaben zur Erfassung von Radkraften--Vergleich verschiedener Konstruktionsprinzipien, Dipl.-Ing. G. Weiger und Dipl.-Ing. D. Dorrie, Stuttgart.
180 ATZ Automobiltechnische Zeitschrift 94(1992) Jan., No. 1, Stuttgart, DE / Mehrkomponenten-Radmessnabe, Einsatzmoglichkeiten und Ergebnisse; by Von Rolf Loh und Friedrich W. Nohl.
Einsatz Piezoelektrischer Mehrkomponenten-Kraftaufnehmer; by zur Erfassung von Radkraften und--momenten.
Aicher Werner
Beste Andreas
Hailer Frank
Muller Manfred
Vogler Josef
Audi AG
Chilcot Richard
Oen William L.
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