Vehicle stabilization device

• US 9,598,074 B2
• Filed: 10/05/2015
• Issued: 03/21/2017
• Est. Priority Date: 10/06/2014
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Honda, Shigehiro, Takahashi, Susumu, Sasaki, Hiroaki
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Dunn, Alex C
• Application Number:
  US14/874,684
• Publication Number:
  US 20160096524A1
• Time in Patent Office: 533 Days
• US Class Current: 1/1
• 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
• CPC Class Codes: B60T 8/176 Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS B60T8/1755 takes precedence
• CPC Class Codes: B60T 8/1764 Regulation during travel on surface with different coefficients of friction, e.g. between left and right sides, mu-split or between front and rear
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 10/20 including control of steering systems
• CPC Class Codes: B60W 10/22 including control of suspension systems
• CPC Class Codes: B60W 2552/40 Coefficient of friction
• CPC Class Codes: B60W 2710/182 Brake pressure, e.g. of fluid or between pad and disc
• CPC Class Codes: B60W 2710/207 Steering angle of wheels
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability

Abstract

A vehicle stabilization system 1 comprises a VSA device to have a braking device generate a braking force to reduce rotation of wheels and perform an anti-lock braking control when a vehicle is braked and an AS device to cancel a yawing moment applied to the vehicle. A vehicle control device estimates a friction coefficient (pad μ value of the brake pad) of a friction material for braking the wheels, calculates braking forces for the left and right wheels using the estimated friction coefficient, calculates a yawing moment applied to the vehicle based on a braking force difference between a left wheel braking force to reduce rotation of the left wheels and a right wheel braking force to reduce rotation of the right wheels and determines an operation amount on the AS device.

Claims

1. A vehicle stabilization system comprising:

a vehicle driving stability control device configured to have a braking device generate a braking force to reduce rotation of wheels and performing an anti-lock braking control when a vehicle is braked; and

a yawing moment cancelling device for cancelling a yawing moment applied to the vehicle,

wherein the vehicle driving stability control device estimates a friction coefficient of a friction material for braking the wheels, calculates braking forces for the left and right wheels using the estimated friction coefficient, calculates a yawing moment applied to the vehicle based on a braking force difference between a left wheel braking force to reduce rotation of the left wheels and a right wheel braking force to reduce rotation of the right wheels and determines an operation amount on the yawing moment cancelling device,

wherein if the braking force difference is larger than a predetermined threshold value, the vehicle driving stability control device determines that a driving road of the vehicle is a split μ

road and operates the yawing moment cancelling device by the operation amount, and

wherein the vehicle driving stability control device estimates the friction coefficient of the friction material for braking the wheels based on a brake fluid pressure supplied to the braking device and a front-rear direction acceleration of the vehicle using a function corresponding to the predetermined correlation of the friction coefficient of the friction material for braking the wheels with the brake fluid pressure supplied to the braking device and the front-rear direction acceleration of the vehicle.

2. The vehicle stabilization system as described in claim 1 wherein the yawing moment cancelling device is a steering device configured to be capable of automatically turning steered wheels of the vehicle.