Braking force control system for vehicle

• US 20040130209A1
• Filed: 11/19/2003
• Published: 07/08/2004
• Est. Priority Date: 04/26/2000
• Status: Active Grant

• Current Assignee: Tohru Akiyama, Yuji Soejima
• Original Assignee: Tohru Akiyama, Yuji Soejima
• Inventors: Soejima, Yuji, Akiyama, Tohru
• Granted Patent: US 6,880,899 B2
• Time in Patent Office: Days
• 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 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, in a case that said lateral acceleration exceeds a lateral acceleration value set beforehand, when said anti-lock braking control is operated at one of the right and left rear wheels, said braking control unit executes a stepwise pressure increase control for providing a stepwise pressure increase for the other rear wheel up to a braking pressure to be reached at a start of the control.

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

a lateral acceleration detecting unit 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 as specified 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 either one of rear wheels and executes a stepwise pressure increase control thereof when said anti-lock braking control is operated at the other rear wheel, said stepwise pressure increase control providing a stepwise pressure increase up to a braking pressure to be reached at a start of the control.

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

4. The braking force control system of a vehicle as claimed in claim 2, 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.

5. 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, when said anti-lock braking control is operated at one of the right and left rear wheels, a stepwise pressure increase control for providing a stepwise pressure increase for the other rear wheel up to a braking pressure to be reached at a start of the control, in a case that said lateral acceleration exceeds a lateral acceleration value set beforehand.

6. 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 as specified when said lateral acceleration exceeds a lateral acceleration value set beforehand; and

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

7. The braking force control method of a vehicle as claimed in claim 6, wherein said front and rear braking force distribution control is started and executed depending on a slipping condition of the rear wheel.

8. The braking force control method of a vehicle as claimed in claim 6, 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.