Drift-out suppress control device of vehicle improved for termination of control

• US 5,704,695 A
• Filed: 09/30/1996
• Issued: 01/06/1998
• Est. Priority Date: 10/18/1995
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sugiyama, Mizuho, Monzaki, Shirou
• Primary Examiner(s): Ballato, Josie
• Application Number:
  US08/723,756
• Time in Patent Office: 463 Days
• Field of Search: 303/140, 303/146-148, 303/157, 303/169, 303/DIG. 6, 364/426.016
• US Class Current: 303/146
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• 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 drift-out suppress control device of a vehicle having a mechanism for estimating a liability of the vehicle body to drift out for producing a drift-out quantity which generally increases along with increase of the drift-out liability; a brake mechanism for selectively applying a variable braking force to each wheel; and a control mechanism for controlling the brake mechanism according to the drift-out quantity so as variably to apply a braking force to rear left and rear right wheels with a target value therefor for suppressing the vehicle body against drifting out, the target value being generally proportional to the drift-out quantity and being divided between the rear left and rear right wheels according to a distribution ratio, wherein the control mechanism decreases a share of the distribution ratio for one of the rear left and rear right wheels serving at the inside of a turn to be progressively lesser relative to a share of the distribution ratio for the other of the rear left and rear right wheels serving at the outside of the turn as the drift-out control approaches the end thereof.

Claims

1. A drift-out suppress control device of a vehicle having a vehicle body, and front left, front right, rear left and rear right wheels, comprising:

a means for estimating a liability of the vehicle body to drift out for producing a drift-out quantity which generally increases along with increase of the drift-out liability;

a brake means for selectively applying a variable braking force to each of said wheels; and

a control means for controlling said brake means according to said drift-out quantity so as variably to apply a braking force to said rear left and rear right wheels with a target value therefor for suppressing the vehicle body against drifting out, said target value being generally proportional to said drift-out quantity and being divided between said rear left and rear right wheels according to a distribution ratio,

wherein said control means decreases a share of said distribution ratio for one of said rear left and rear right wheels serving at the inside of a turn to be progressively lesser relative to a share of said distribution ratio for the other of said rear left and rear right wheels serving at the outside of the turn as the drift-out control approaches the end thereof.

2. A drift-out suppress control device according to claim 1, wherein said control means includes a means for detecting a peak point of increase of said drift-out quantity, and starts a progressive reduction of said share of distribution ratio for the rear wheel at the inside of the turn relative to said share of distribution ratio for the rear wheel at the outside of the turn at the detection of said peak point.

3. A drift-out suppress control device according to claim 2, wherein said control means further includes a means for taking a delay time from the detection of said peak point, and starts said progressive reduction of said share of distribution ratio for the rear wheel at the inside of the turn relative to said share of distribution ratio for the rear wheel at the outside of the turn after the lapse of said delay time from the detection of said peak point.