Brake pressure apply

• US 8,602,508 B2
• Filed: 06/30/2006
• Issued: 12/10/2013
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Lavoie, Erick, Salmon, Thomas, Mattson, Keith
• Primary Examiner(s): Williams, Thomas J
• Assistant Examiner(s): SY, MARIANO ONG
• Application Number:
  US11/427,838
• Publication Number:
  US 20080001477A1
• Time in Patent Office: 2,720 Days
• Field of Search: 303/3, 303/146, 303/147, 303/148, 303/155, 701/38, 701/78, 701/83
• US Class Current: 303/155
• CPC Class Codes: B60T 13/12 the fluid being liquid
• CPC Class Codes: B60T 2201/122 Pre-actuation in case of ESP control
• CPC Class Codes: B60T 2230/03 Overturn, rollover
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02

Abstract

A method for brake pressure apply in a hydraulic brake system includes commanding a cage clearance reduction phase and commanding a wheel control phase subsequent to the cage clearance reduction phase. Accordingly, the cage clearance is reduced prior to entering the wheel control phase. A method for cage clearance reduction in a hydraulic brake system for roll stability control is also provided.

Claims

1. A method for brake pressure apply in a hydraulic brake system comprising:

commanding a cage clearance reduction phase as a series of pressure increases and decreases while a measured pressure is greater than zero and until the measured pressure matches a pressure control estimate during the cage clearance reduction phase; and

commanding a wheel control phase subsequent to the cage clearance reduction phase, wherein a cage clearance is reduced prior to said commanding of the wheel control phase.

2. The method of claim 1 wherein the cage clearance reduction phase and the wheel control phase are initiated during a roll stability control (“

RSC”

).

3. The method of claim 2 further comprising determining whether the RSC is complete.

4. The method of claim 3 further comprising determining whether an inertial phase is exceeded when the RSC is not complete, the inertial phase being a phase during the cage clearance reduction phase during which time a brake system inertia is dissipated.

5. The method of claim 4 wherein said commanding the cage clearance reduction phase is in response to said determining whether the inertial phase is exceeded.

6. The method of claim 1 further comprising determining whether an inertial phase is exceeded, the inertial phase being a phase during the cage clearance reduction phase during which time a brake system inertia is dissipated.

7. The method of claim 6 wherein said commanding the cage clearance reduction phase is in response to said determining whether an inertial phase is exceeded.

8. The method of claim 6 wherein said commanding the wheel control phase s in response to said determining that the inertial phase is not exceeded.