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AssigneeWABCO GmbH & Co. OHG
InventorsDetlef Schmidt, Andre Bork, Klaus Pape, Gerhard Ruhnau, Thomas Dieckmann
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A tire pressure monitoring system and method for vehicles equipped with anti-ing lock breaking systems (ABS), especially vehicles with more than two axles, is provided. Wheel sensors associated with the ABS are utilized to sense variables which depend on wheel rotation, such as speed of rotation of the wheels or travel distances covered by the wheels. An ABS control unit logically combines the determined variables with one another and performs an evaluation with respect to change of rolling radii of the wheels while allowing for changes of the variable caused by driving operation. The ABS control unit generates a warning signal when the change of variables caused by tire pressure decrease exceeds a preselected limit value. In addition to the wheel sensors, a tire pressure measuring system which measures the absolute tire inflation pressure of the wheels of at least one axle and generates a warning signal when the measured tire inflation pressure drops below a preselected setpoint pressure can be utilized.
A method for monitoring tire pressure in a vehicle having at least four wheels and wheel sensors, said method comprising the steps of sensing at least one attribute associated with wheel rotation of each of said at least four wheels, determining travel distances covered by each of said at least four wheels by evaluating said at least one attribute for each of said at least four wheels.
A tire pressure monitoring system for a vehicle having a plurality of wheels, a plurality of axles for supporting said wheels, and an anti-lock braking system including a control unit, said monitoring system comprising wheel sensors on at least one of said wheels of at least one of said axles for sensing attributes associated with wheel rotation, said control unit adapted to logically combine said attributes and to evaluate said attributes with respect to change of rolling radii of said wheels and to account for change of said attributes caused by driving operation, and means for generating a warning signal when said change of said attributes caused by tire pressure decrease exceeds a preselected limit value.
A method for monitoring tire pressure in a vehicle having a plurality of wheels, a plurality of axles for supporting said wheels, and an anti-lock braking system including a control unit and wheel sensors, said method comprising the steps of sensing a value associated with wheel rotation for each of said wheels, summing said value along diagonal groupings of said wheels relative to the arrangement of said wheels on said vehicle, comparing the sums of said values for each diagonal grouping of said wheels, recognizing an insufficient tire pressure condition and generating a warning signal when said sums differ from one another by more than a preselected limit value.
Dependencies are inferred from the claim text.