METHOD OF CONTROLLING A VEHICLE BRAKE WITH TORQUE CORRECTION

• US 20090024290A1
• Filed: 07/11/2008
• Published: 01/22/2009
• Est. Priority Date: 07/19/2007
• Status: Active Grant

• Current Assignee: Safran Landing Systems
• Original Assignee: Messier-Bugatti (Safran SA)
• Inventors: THIBAULT, Julien, Onfroy, Dominique
• Granted Patent: US 8,290,676 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 13/741 acting on an ultimate actuator
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• CPC Class Codes: B60T 8/1703 for aircrafts

Abstract

The invention relates to a method of controlling a vehicle brake that is adapted to exert a braking force in response to an actuation setpoint, the method comprising the following steps:

• • from a braking setpoint, determining a nominal actuation setpoint for the brake actuator, taking account of all of the components of the braking setpoint;
  • from the same braking setpoint, and from a measurement of the torque developed by the brake, determining a correction for the nominal actuation setpoint, this correction taking account only of low-frequency variations in the braking setpoint; and
  • adding the correction to the nominal setpoint.

Claims

1. A method of controlling a vehicle brake that is adapted to exert a braking force in response to an actuation setpoint, the method comprising the following steps:

from a braking setpoint, determining a nominal actuation setpoint for the brake actuator, taking account of all of the components of the braking setpoint;

from the same braking setpoint, and from a measurement of the torque developed by the brake, determining a correction for the nominal actuation setpoint, this correction taking account only of low-frequency variations in the braking setpoint; and

adding the correction to the nominal setpoint.

2. A method according to claim 1, in which, in order to determine the correction, an image of the mean torque applied by the brake is constructed from the braking setpoint, and the means torque is compared with the measured torque.

3. A method according to claim 2, in which, prior to performing the comparison, the image of the mean torque and the torque measurement are both filtered in order to eliminate high-frequency components.

4. A method according to claim 3, in which the comparison delivers an error that is subjected to treatment, followed by saturation in order to restrict the correction to values lying within a predetermined range.

5. A method according to claim 1, in which the correction is neutralized if the vehicle is stationary or if a failure of the torque measurement means is detected.

6. A method according to claim 5, in which the neutralization of the correction includes the step of freezing the correction value to a given value.

7. A method according to claim 1, in which the braking setpoint includes high frequency components generated by implementing anti-locking protection, these high frequency components being filtered out in order to determine the correction for the nominal actuation setpoint.

8. A method according to claim 1, in which the corrected actuation setpoint is saturated.

9. Apparatus for implementing the method of claim 1, the apparatus comprising:

an input for receiving a braking setpoint;

an input for receiving a measurement of the torque generated by the brake;

calculation means for calculating a nominal actuation setpoint for the brake actuator on the basis of the braking setpoint;

calculation means for calculating a correction for the nominal actuation setpoint on the basis of the braking setpoint and of the torque measurement, and taking account only of variations at low frequency in the braking setpoint; and

an output delivering the sum of the actuation setpoint plus the actuation setpoint correction.