Braking force control system for vehicle

• US 6,880,899 B2
• Filed: 11/19/2003
• Issued: 04/19/2005
• Est. Priority Date: 04/26/2000
• Status: Expired due to Fees

• Current Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Original Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Inventors: Akiyama, Tohru, Soejima, Yuji
• Primary Examiner(s): Graham, Matthew C.
• Assistant Examiner(s): SY, MARIANO ONG
• Application Number:
  US10/716,911
• Publication Number:
  US 20040130209A1
• Time in Patent Office: 517 Days
• Field of Search: 303/146, 303/147, 303/155, 303/186, 303/113.5, 303/113.4
• US Class Current: 303/146
• CPC Class Codes: B60T 2250/02 Vehicle mass
• 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 vehicle having an ABS control system, a braking control of a right and left rear wheels can be independently carried out when a lateral acceleration exceeds a lateral acceleration value set beforehand. When the ABS control is operated at one of the right and left rear wheels, the control system executes a stepwise pressure increase control which provides a stepwise pressure increase for the other rear wheel up to a braking pressure to be reached at a start of the control.

Claims

1. A braking force control system of a vehicle, comprising:

a lateral acceleration detecting unit for detecting a lateral acceleration of the vehicle; and

a braking control unit carrying out an anti-lock braking control and carrying out an independent braking control of right and left rear wheels,

wherein said braking control unit executes a braking force distribution control between front and rear wheels when said lateral acceleration exceeds a lateral acceleration value set beforehand,

and said braking control unit stops said front and rear braking force distribution control of a first rear wheel and executes a stepwise pressure increase control of said first rear wheel when said anti-lock braking control is operated at a second rear wheel,

said stepwise pressure increase control for providing a stepwise pressure increase up to a braking pressure to be reached at the start of the control of the braking control unit at the first rear wheel.

2. The braking force control system of a vehicle as claimed in claim 1, wherein said front and rear braking force distribution control is started and executed depending on a slipping condition of the rear wheel.

3. The braking force control system of a vehicle as claimed in claim 1, wherein said front and rear braking force distribution control is executed by selecting one of a select low control controlling braking forces of wheels in accordance with a wheel on the side with a large slipping state, and an independent braking control independently controlling the braking forces of the wheels depending on the slipping state thereof in accordance with the lateral acceleration, a longitudinal acceleration and a vehicle speed.

4. A braking force control method of a vehicle having a braking control unit carrying out an anti-lock braking control and carrying out an independent braking control of right and left rear wheels, said method comprising the steps of:

detecting a lateral acceleration of the vehicle; and

executing a braking force distribution control between front and rear wheels when said lateral acceleration exceeds a lateral acceleration value set beforehand; and

executing, when said anti-lock braking control is operated at a first rear wheel, a stepwise pressure increase control at a second rear wheel after stopping said front and rear braking force distribution control of said front and rear wheels, said stepwise pressure increase control providing a stepwise pressure increase up to a braking pressure to be reached at a start of the anti-lock braking control of the vehicle.

5. The braking force control method of a vehicle as claimed in claim 4, wherein said front and rear braking force distribution control is started and executed depending on a slipping condition of the rear wheel.

6. The braking force control method of a vehicle as claimed in claim 4, wherein said front and rear braking force distribution control is executed by selecting one of a select low control controlling braking forces of wheels in accordance with a wheel on the side with a large slipping state, and an independent braking control independently controlling the braking forces of the wheels depending on the slipping state thereof in accordance with the lateral acceleration, a longitudinal acceleration and a vehicle speed.

7. A braking force control system of a vehicle, comprising:

a lateral acceleration detecting unit for detecting a lateral acceleration of the vehicle; and

a braking control unit for carrying out an anti-lock braking control and carrying out an independent braking control of right and left rear wheels,

wherein said braking control unit executes a braking force distribution control between front and rear wheels when said lateral acceleration exceeds a lateral acceleration value set beforehand, and said braking control unit stops said front and rear braking force distribution control of one of said rear wheels and executes a stepwise pressure increase control on said one of said rear wheels when said anti-lock braking control is operated at the other of said rear wheels, said stepwise pressure increase control being in a plurality of steps of increasing and holding pressure and providing a stepwise pressure increase up to a braking pressure to be reached at a start of the control of the braking force.

8. The braking force control system of a vehicle as claimed in claim 7, wherein said front and rear braking force distribution control is started and executed depending on a slipping condition of the rear wheel.

9. The braking force control system of a vehicle as claimed in claim 7, wherein said front and rear braking force distribution control is executed by selecting one of a select low control controlling braking forces of wheels in accordance with a wheel on the side with a large slipping state, and an independent braking control independently controlling the braking forces of the wheels depending on the slipping state thereof in accordance with the lateral acceleration, a longitudinal acceleration and a vehicle speed.