Low tire warning system

Details Low tire warning system Low tire warning system

1996-12-23

1998-02-24

Hofsass, Jeffrey

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340444, 731462, 731465, 116 34R, 200 6122, 364565, 364424034, B60C 2300

Patent

active

057215286

ABSTRACT:
A system and method that monitors four wheel sensors of an automotive vehicle to determined changes in the effective rolling radii of any wheel and a low pressure tire condition. Certain vehicle operating conditions, such as excessive or very low speeds, braking, and turns, are determined from the sensor outputs and are used to prevent erroneous detection of changes in effective rolling radii. Data from the sensors that is determined to be acceptable is accumulated over time as displacement values for each wheel. When the displacement values exceed a predetermined value, a metric function is used to compare differences detected in accumulated displacement values for the front pair of wheels and for the rear pair of wheels. If the difference between compared pairs of wheels is excessive, as compared with a predetermined baseline metric value, a low tire condition is detected. Further accumulation of instances where the metric indicates a detected condition, provides confidence that the condition actually exists and a warning is provided to the vehicle operator. Resetting of the system and the baseline metric is performed when the low tire condition is corrected or when the tires are checked and properly inflated.

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Kevin Jost, "1997 Pontiac Grank Prix sedan", Automotive Engineering, Apr. 1996, pp. 65-66 1995 Japan Market Mitsubishi Diamante, Service Manual, Translated.

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