Anti-skid control device for vehicle

Patent metadata

Field	Value
Publication number	US-2019256099-A1
Application number	US-201716347224-A
Country	US
Kind code	A1
Filing date	Nov 10, 2017
Priority date	Nov 11, 2016
Publication date	Aug 22, 2019
Grant date	—

Abstract

Anti-skid control is performed by switching between a reduction mode for reducing braking torque and an increase mode for increasing braking torque based on a comparison between four wheel speeds and vehicle body speed. A controller calculates wheel accelerations based on wheel speeds and includes a control mode condition where the reduction mode is selected at each wheel and a wheel acceleration condition where each wheel acceleration is within a predetermined value range. If a state in which the control mode condition and the wheel acceleration condition are simultaneously satisfied is maintained over a predetermined time period, the controller determines that a residual state is satisfied. When the residual state is not satisfied, the controller calculates vehicle body speed based on the maximum value of the wheel speeds, whereas when the residual state is satisfied, the controller calculates vehicle body speed based on the minimum value of the wheel speeds.

First claim

1 . An anti-skid control device for a vehicle applied to a four wheel drive vehicle in which a driving force from a driving source of the vehicle is transmitted to four wheels, the anti-skid control device comprising:
a wheel speed sensor that detects wheel speeds of four wheels of the vehicle; and a controller that calculates a vehicle body speed of the vehicle based on at least one of the four wheel speeds and executes an anti-skid control for suppressing lock tendency of the four wheels by selectively switching between a reduction mode of reducing a braking torque applied to the four wheels and an increase mode of increasing the braking torque based on a comparison result between the four wheel speeds and the vehicle body speed; wherein the controller calculates accelerations of the four wheels based on the four wheel speeds, and is configured to include a control mode condition of selecting the reduction mode in the four wheels and a wheel acceleration condition in which the accelerations of the four wheels are within a range of a predetermined value; the controller determines as a residual state when a state in which the control mode condition and the wheel acceleration condition are satisfied at the same time is continued for a predetermined time, calculates the vehicle body speed based on a maximum speed value, which is a maximum value of the four wheel speeds, when determined as not the residual state, and calculates the vehicle body speed based on a minimum speed value, which is a minimum value of the four wheel speeds, when determined as the residual state.

2 . The anti-skid control device for the vehicle according to claim 1 , wherein the controller is configured to include a wheel speed condition in which a difference between the maximum speed value and the minimum speed value is less than or equal to a predetermined speed; and
the controller determines as the residual state when a state in which the control mode condition, the wheel acceleration condition, and the wheel speed condition are satisfied at the same time is continued for the predetermined time.

3 . An anti-skid control device for a vehicle applied to a four wheel drive vehicle in which a driving force from a driving source of the vehicle is transmitted to four wheels, the anti-skid control device comprising:
a wheel speed sensor that detects wheel speeds of four wheels of the vehicle; and a controller that calculates a vehicle body speed of the vehicle based on at least one of the four wheel speeds and executes an anti-skid control for suppressing lock tendency of the four wheels by selectively switching between a reduction mode of reducing a braking torque applied to the four wheels and an increase mode of increasing the braking torque based on a comparison result between the four wheel speeds and the vehicle body speed; wherein the controller is configured to include a control mode condition of selecting the reduction mode in the four wheels and a wheel speed condition in which a difference between a maximum speed value, which is a maximum value of the four wheel speeds, and a minimum speed value, which is a minimum value of the four wheel speeds, is less than or equal to a predetermined speed; and the controller determines as a residual state when a state in which the control mode condition and the wheel speed condition are satisfied at the same time is continued for a predetermined time, calculates the vehicle body speed based on the maximum speed value when determined as not the residual state, and calculates the vehicle body speed based on the minimum speed value when determined as the residual state.

Assignees

• Advics Co Ltd

Inventors

• Mizuguchi Yohei
• Terasaka Masato

Classifications

• B60W30/18172 Primary

  Preventing, or responsive to skidding of wheels · CPC title

• B60W2520/26

  Wheel slip · CPC title

• B60W2520/28

  Wheel speed · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• B60W30/18109

  Braking · CPC title