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| Key opening apparatus |
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Extended brake switch software for vehicle stability enhancement system
| Details |
Inventors: Ghoneim, Youssef Ahmed; Sidlosky, David Michael;
Assignee: General Motors Corporation (Detroit, MI); Delphi Technologies Inc. (Troy, MI)
Primary Examiner: Zanelli; Michael J.
Assistant Examiner:
Attorney, Agent or Firm: Grove; George A.
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. |
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DETAILED DESCRIPTION This invention is typically applicable in automotive vehicles incorporating a computer-based antilock brake system (ABS) or a traction control system (TCS) in combination with vehicle yaw control.
It is applicable in such systems in which at least two of the vehicle wheels, i.
e.
, the front wheels or the rear wheels, are undriven.
In vehicle control systems of this type, the micro-processor-based controller receives data from wheel speed sensors and a brake off/on switch, among other possible data sources, in the course of its control of brake actuators for each wheel.
In many such control systems, it also necessary to employ a brake pedal travel sensor so that the controller receives more data concerning whether the driver is pressing heavily on the brake pedal and has thus effected a hard brake condition.
Reliance upon a brake pedal travel sensor, or extended brake switch as it is sometimes called, presents three possible disadvantages.
Such a switch adds expense and it may not work properly.
Finally, the hydraulic brake pressure obtained from a fully-actuated brake is constant and independent of road surface conditions.
This means that a 300 psi brake pressure on a dry surface that might not corrupt the wheel speed of an undriven wheel, might cause a wheel lock-up on ice and result in a bad yaw rate estimation.
Therefore, one setting of the extended brake switch travel is not adequate for the yaw rate estimation.
This invention provides a method of determining a hard brake condition and, therefore, provides a substitute for a brake pedal travel sensor.
In an alternative embodiment, the invention also provides a means for determining the effectiveness of such a sensor.
In accordance with the method, the speed (i.
e.
, velocity in, e.
g.
, meters per second) of the undriven wheels is measured using available wheel speed sensors.
This data, utilized over a suitable number of controller processing cycles, is used to calculate the average acceleration of the undriven wheels
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