System and method for diagnosing loss of pressure in tires of a

Details System and method for diagnosing loss of pressure in tires of a System and method for diagnosing loss of pressure in tires of a

1996-12-09

1998-06-09

Swarthout, Brent A.

Communications: electrical

Land vehicle alarms or indicators

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

731465, 340442, B60C 2300

Patent

active

057641374

ABSTRACT:
A system and method for diagnosing when a tire of a vehicle is beginning to lose pressure. The vehicle has four wheels, and four associated tires mounted thereon, each with an associated angular speed when the vehicle is in motion. Four wheel speed sensors are attached to one of the four wheels of the vehicle for sensing the angular speed of each wheel. A microprocessor is also included that is electrically coupled to each of the wheel speed sensors for receiving the angular speed of each wheel. The microprocessor integrates, over time, the angular speed of each wheel. An indicator is also provided that is coupled to the microprocessor for indicating that a tire of the vehicle is losing pressure if the microprocessor determines that the integral of the angular speed of one of the tires is greater than the integral of the angular speed of the other tires. A method is also provided for diagnosing when one of the vehicle tires is beginning to lose pressure, such as in the case of a slow leak.

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"The Michelin-BMW Tire Pressure Checking System. The First Step Towards the Development of an Active Tire", H. Wallentowitz, H. Riedi, H. Bruns.

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