Patent ID: 8155853
Filing Date: 2012-04-10
Classification: B60R,B60T,B60W

Abstract:
1. A method for providing limited braking for an automatic vehicle braking system to prevent a collision, said method comprising: monitoring collision threats on a subject vehicle; estimating a collision risk value between the subject vehicle and an object; calculating a closing speed between the subject vehicle and the object; calculating a distance to collision between the subject vehicle and the object; calculating a time to collision between the subject vehicle and the object; determining whether the collision risk value is greater than a first predetermined threshold; providing full automatic braking of the subject vehicle if the collision risk value is greater than the first predetermined threshold; determining whether the collision risk value is greater than a second predetermined threshold if the collision risk value is less than the first predetermined threshold; determining whether the collision risk value is greater than a third predetermined threshold if the collision risk value is greater than the second predetermined threshold, where the third predetermined threshold is between the first and second predetermined thresholds; calculating a time dilation deceleration value; estimating a projected closing speed of the subject vehicle to the object; determining whether the time dilation deceleration value is greater than a predetermined deceleration threshold; providing automatic braking to decelerate the vehicle to a full stop if the time dilation deceleration value is greater than the deceleration threshold; and automatically braking the subject vehicle to decelerate the subject vehicle at the time dilation deceleration value if the time dilation deceleration value is not greater than the deceleration threshold.