Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1998-08-31
2000-09-05
Felber, Joseph L.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
E01C 2300
Patent
active
061125865
ABSTRACT:
A method and system for controlling an automotive vehicle spindle-coupled road simulator with a predetermined effective road profile for a road surface uses tire loss-of-contact compensation to modify the tracking parameter in a control loop to avoid incorrectly loading a test vehicle. Tire deflection obtained during measurement of a vehicle's tire profile calculation is used to detect and flag regions where the tire profile is not a function of the road input so that the tire profile motion is governed only by the free dynamic response of the suspension. A tire model is first developed for a vehicle. The vehicle is then coupled to the spindle-coupled simulator, and a set of control signals is generated in a control loop. The control signals are used for driving the spindle-coupled simulator with the vehicle attached thereto so that a response generated by the simulator is consistent with the predetermined effective tire profile. Determination of the set of control signals includes selection of a composite tracking response from a generated output representing a tire in contact with the road surface and a tire deflection output representing a tire having lost contact with the road surface.
REFERENCES:
patent: 5065618 (1991-11-01), Hodges et al.
patent: 5610330 (1997-03-01), Fricke et al.
Chabaan Rakan C.
Fricke David M.
Mianzo Lawrence A.
Saleem Fayyaz
Felber Joseph L.
Ford Global Technologies Inc.
Kelley David B.
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