Lane departure prevention system

• US 20060217887A1
• Filed: 12/27/2005
• Published: 09/28/2006
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Iwasaka, Takeshi
• Granted Patent: US 7,693,661 B2
• Time in Patent Office: Days
• US Class Current: 701/301
• CPC Class Codes: B60T 2201/08 Lane monitoring; Lane Keeping Systems
• CPC Class Codes: B60T 2201/083 using active brake actuation
• CPC Class Codes: B60T 2201/086 using driver related features
• CPC Class Codes: B60T 8/1708 for lorries or tractor-trailer combinations
• CPC Class Codes: B60T 8/17557 specially adapted for lane departure prevention road vehicle drive control systems for lane keeping otherwise than by controlling a particular sub-unit B60W30/12

Abstract

The present lane departure prevention system can prevent a vehicle from departing from a lane of travel, even when the vehicle tows a towed vehicle. When the towed vehicle is detected, the lane departure prevention system changes a target yaw moment which is used in normal departure avoidance control operation, based on a force input to the vehicle from the towed vehicle, which is caused by carrying out departure avoidance control, thereby controlling the vehicle so as not to depart from the lane by corrected yaw moment.

Claims

1. A lane departure prevention system comprising:

a departure determining unit for determining whether a first vehicle is tending to depart from a lane of travel;

a tow detecting unit for detecting whether the first vehicle tows a second vehicle;

a departure avoidance control unit for controlling the first vehicle to avoid a lane departure when said departure determining unit determines that the vehicle is tending to depart from the lane of travel; and

a correcting unit for correcting an extent of control necessary to avoid the lane departure, which is carried out by said departure avoidance control unit, when said tow detecting unit detects that the first vehicle tows the second vehicle.

2. The lane departure prevention system according to claim 1, wherein said departure avoidance control unit controls the first vehicle to avoid the lane departure by causing a braking power difference between left and right wheels of the first vehicle thereby applying a yaw moment to the vehicle, and wherein said correcting unit reduces the yaw moment applied to the first vehicle, based on yaw moment input to the first vehicle, which is caused by the braking power difference.

3. The lane departure preventing system according to claim 1, wherein said departure avoidance control unit causes the first vehicle to avoid the lane departure by applying a braking power to vehicle wheels thereby decelerating the vehicle, and

wherein said correcting unit enhances deceleration by said departure avoidance control unit, based on a travel direction component of a yaw moment input which is caused by the deceleration of the first vehicle.

4. The lane departure prevention system according to claim 1, wherein said correcting unit detects a weight of the second vehicle and corrects an extent of control carried out by s aid departure avoidance control unit on the basis of the detected weight.

5. The lane departure prevention system according to claim 2, wherein said correcting unit detects a weight of the second vehicle and reduces an extent of control carried out by s aid departure avoidance control unit on the basis of the detected weight.

6. The lane departure prevention system according to claim 3, wherein said correcting unit detects a weight of the second vehicle and enhances an extent of control carried out by said departure avoidance control unit on the basis of the detected weight.