VEHICLE BEHAVIOR CONTROL SYSTEM

• US 20150217736A1
• Filed: 01/29/2015
• Published: 08/06/2015
• Est. Priority Date: 02/04/2014
• Status: Active Grant

• Current Assignee: Autoliv Nissin Brake Systems Japan Co., Ltd. (Autoliv Incorporated)
• Original Assignee: Nissin Kogyo Company Limited (Hitachi, Ltd.)
• Inventors: NOMURA, Nobuyuki, NISHIGAKI, Takahiro, HAMAMOTO, Natsuko, MURASHITA, Shinji, WADA, Kenta
• Granted Patent: US 9,610,925 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60T 2270/30 ESP control system
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• CPC Class Codes: B60T 8/17551 determining control parameters related to vehicle stability used in the regulation, e.g. by calculations involving measured or detected parameters

Abstract

According to one embodiment, there is provided a vehicle behavior control system. The vehicle behavior control system includes a behavior stabilization control module that is configured to execute a behavior stabilization control so as to stabilize a behavior of a vehicle by giving a braking force to a turning outer wheel of the vehicle based on a target braking force. The behavior stabilization control module has a target braking force setting section that sets the target braking force. The target braking force is set so as to be smaller for a second turn than for a first turn.

Claims

1. A vehicle behavior control system comprising:

a behavior stabilization control module configured to execute a behavior stabilization control so as to stabilize a behavior of a vehicle by giving a braking force to a turning outer wheel of the vehicle based on a target braking force,

wherein the behavior stabilization control module has

a target braking force setting section configured to set the target braking force smaller for a second turn than for a first turn, the first turn being a sharp turn occurring first, the second turn being an other sharp turn than the first turn.

2. The vehicle behavior control system of claim 1, comprising:

a lateral acceleration obtaining module configured to obtain a lateral acceleration;

a corrected lateral acceleration calculation module configured to calculate a corrected lateral acceleration so as to increase following an increase of an absolute value of the lateral acceleration and so as not to easily decrease in response to a decrease of the absolute value of the lateral acceleration;

a variation calculation module configured to calculate a variation in the corrected lateral acceleration;

a steering angle obtaining module configured to obtain a steering angle;

a vehicle speed obtaining module configured to obtain a vehicle speed; and

a standard yaw rate calculation module configured to calculate a standard yaw rate of the vehicle based on the vehicle speed and the steering angle,

wherein the target braking force setting section determines

that the first turn occurs in case the variation in the corrected lateral acceleration is equal to or larger than a first determination threshold when the standard yaw rate exceeds a second determination threshold and the behavior stabilization control is started, and

that the second turn occurs in case the variation in the corrected lateral acceleration is smaller than the first determination threshold when the standard yaw rate exceeds the second determination threshold and the behavior stabilization control is started.

3. The vehicle behavior control system of claim 1, comprising:

a lateral acceleration obtaining module configured to obtain a lateral acceleration;

a corrected lateral acceleration calculation module configured to calculate a corrected lateral acceleration so as to increase following an increase of an absolute value of the lateral acceleration and so as not to easily decrease in response to a decrease of the absolute value of the lateral acceleration;

a steering angle obtaining module configured to obtain a steering angle; and

a turn determination module configured to determine

that the vehicle is turning when the steering angle exceeds a turn determination threshold, and

that that the vehicle is not turning when the steering angle is equal to or smaller than the turn determination threshold,

wherein the target braking force setting section

sets a determination flag from 0 to 1 in case the corrected lateral acceleration changes from a value that is smaller than a third determination threshold to a value that is equal to or larger than the third determination threshold when the turn determination module determines that the vehicle is turning, and

sets the determination flag to 0 in case the flag is 1 when the turn determination module determines that the vehicle is not turning, and

wherein the target braking force setting section determines

that the first turn occurs when the turn determination module determines that the vehicle is turning while the determination flag is set to 1, and

that the second turn occurs when the turn determination module determines that the vehicle is turning while the determination flag is set to 0.

4. The vehicle behavior control system of claim 1,

wherein the behavior stabilization control module starts the behavior stabilization control more easily for the second turn than for the first turn.