Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Reexamination Certificate
2007-05-30
2011-10-18
Hofsass, Jeffery (Department: 2612)
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
C340S444000, C073S146500
Reexamination Certificate
active
08040229
ABSTRACT:
An object is to provide a method capable of reducing calculation number of times for obtaining a primary regression line of a slip ratio and acceleration, and detecting a decrease in internal pressure of tires with high accuracy even in the case where is no evenness in a road surface.The present invention is a method for alarming decrease in tire air-pressure including the steps of: detecting rotational information obtained from tires installed in a vehicle; respectively calculating a wheel velocity, a vehicle acceleration and a slip ratio of the front wheel and a slip ratio of the rear wheel from the rotational information of the respective tires; accumulating the vehicle acceleration and the slip ratio of the front wheel and the slip ratio of the rear wheel; obtaining a primary regression coefficient of the vehicle acceleration and the slip ratio of the front wheel and the slip ratio of the rear wheel; and judging whether or not the tires are decreased in the air pressure upon comparing the primary regression coefficient and a reference value of the primary regression coefficient preliminarily calculated in the above step when air pressure in the tires is the reference internal pressure.
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Extended European Search Report dated Feb. 18, 2011 for Application No. 07744432.1.
Birch, Stewart, Kolasch and Birch LLP
Hofsass Jeffery
Sumitomo Rubber Industries Ltd.
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