Braking force distribution controlling apparatus

• US 5,938,299 A
• Filed: 09/03/1997
• Issued: 08/17/1999
• Est. Priority Date: 09/09/1996
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Chiba, Tadashi, Hara, Masahiro
• Primary Examiner(s): Young, Lee W.
• Application Number:
  US08/922,673
• Time in Patent Office: 713 Days
• Field of Search: 303/186, 303/188, 303/189, 303/113.5, 303/3, 303/15, 303/20, 303/DIG. 7, 303/9.62
• US Class Current: 303/186
• CPC Class Codes: B60T 8/1766 Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle

Abstract

In a braking force distribution controlling apparatus mounted on a car and arranged to perform such a control as to make a rear-wheel braking force smaller than a front-wheel braking force when predetermined initiation conditions are met, one of the initiation condition is to satisfy either one of such a first condition that a body deceleration is not less than a first predetermined deceleration K1 and that a rear-wheel slip value is a first predetermined value or more greater than a front-wheel slip value and such a second condition that the body deceleration is not less than a second predetermined deceleration K2 which is a value greater than the aforementioned first predetermined deceleration K1.

Claims

1. A braking force distribution controlling apparatus mounted on a car and arranged to perform such a control as to make a rear-wheel braking force smaller than a front-wheel braking force when predetermined initiation conditions are met,

wherein one of said initiation conditions is to satisfy either one of such a first condition that a body deceleration is not less than a first predetermined deceleration K1 and that a rear-wheel slip value is greater than a front-wheel slip value by at least a first predetermined value and such a second condition that said body deceleration is not less than a second predetermined deceleration K2, which is a value greater than said first predetermined deceleration K1.

2. A braking force distribution controlling apparatus according to claim 1, wherein determination of whether said rear-wheel slip value is greater than said front-wheel slip value by at least the first predetermined value is made by determining whether a value obtained by subtracting a wheel velocity of rear wheel from a wheel velocity of front wheel is not less than the first predetermined value.

3. A braking force distribution controlling apparatus mounted on a car and arranged to perform such a control as to make a rear-wheel braking force smaller than a front-wheel braking force when predetermined initiation conditions are met,

said controlling apparatus having body velocity calculating means for calculating a deceleration of the body, based on velocities of wheels, wherein one of said initiation conditions is to satisfy either one of such a first condition that a body deceleration is not less than a first predetermined deceleration K1 and that a rear-wheel slip value is greater than a front-wheel slip value by at least a first predetermined value and such a second condition that said body deceleration is not less than a second predetermined deceleration K2, which is a value greater than said first predetermined deceleration K1, and that the rear-wheel slip value is greater than the front-wheel slip value by at least a second predetermined value which is smaller than the first predetermined value.

4. A braking force distribution controlling apparatus according to claim 3, wherein determination of whether said rear-wheel slip value is greater than said front-wheel slip value by at least the first or second predetermined value is made by determining whether a value obtained by subtracting a wheel velocity of rear wheel from a wheel velocity of front wheel is not less than the first or second predetermined value.