Extended brake switch software for vehicle stability enhancement system
AssigneesGeneral Motors Corporation, Delphi Technologies, Inc.
InventorsYoussef Ahmed Ghoneim, David Michael Sidlosky
Life of this patent
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Abstract
A process is disclosed for use in a micro-processor managed brake control system that utilizes wheel speed sensors and a brake off/on switch when the system requires information as to whether the vehicle is experiencing hard braking. In accordance with the process, the average deceleration of the undriven wheels is estimated and the slip of each undriven wheel is estimated and the results are compared with predetermined values for these parameters over a suitable test period. At the conclusion of these tests, the data may be used in place of data from a brake pedal position sensor or to confirm the data from such a sensor.
Claims10
A method of determining a condition of hard braking in a vehicle having a brake off/on switch and a pair of undriven wheels, the method comprising:
- measuring the speed of each undriven wheel and determining the average deceleration of said wheels,
- determining wheel slip values of the undriven wheels and
- comparing said deceleration and slip values with predetermined threshold values of these parameters over a predetermined comparison period to determine a said hard braking condition.
A method of determining a condition of hard braking in a vehicle having a brake off/on switch and a pair of undriven wheels, the method comprising:
- measuring the speed of each undriven wheel and determining the average deceleration of said wheels;
- making a first comparison test comprising comparing said average deceleration with a predetermined threshold value of said deceleration;
- determining wheel slip values of the undriven wheels;
- and
- making a second comparison test comprising comparing said deceleration and slip values with predetermined threshold values of these parameters;
- said measuring, determining and first and second comparison steps being repeated over a predetermined comparison test period to determine the presence or absence of a said hard braking condition.
Dependencies are inferred from the claim text.