Measuring and testing – Tire – tread or roadway
Reexamination Certificate
2006-10-09
2008-08-26
Allen, Andre J (Department: 2855)
Measuring and testing
Tire, tread or roadway
C701S087000
Reexamination Certificate
active
07415872
ABSTRACT:
In a method for characterizing a road surface beneath a moving vehicle whose powertrain includes a torque converter coupling the engine to a driven wheel, a set of successive values for the torque converter's slip error rate is generated using filtered values for engine speed and torque converter turbine speed. The road surface characteristic is identified based on the set of slip error rate values, as through a comparison of the set with a plurality of case statements, wherein each case statement corresponds with a different road characteristic and/or general surface type. Weighted average values are calculated based on subsets of the values within the set, for use in identifying transitions from one type of surface to another, or one surface characteristic to another. Indicated slip error rates generated in response to changes in an engine torque demand request are also identified to avoid a false indication.
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DeGeorge John W.
Lowe Gary K.
Allen Andre J
Chrysler LLC
Smith Ralph E.
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