Collision prediction and mitigation method for a vehicle
First Claim
1. A method of mitigating an impending collision of a host vehicle with a target obstacle, comprising the steps of:
- detecting a time-to-collision between the host vehicle and the target obstacle;
calculating a steering radius of the host vehicle based on a velocity of the host vehicle and a lateral acceleration parameter;
estimating a time-to-turn for avoiding the impending collision by steering the host vehicle based on the calculated steering radius;
estimating a time-to-brake for avoiding the impending collision by braking the host vehicle;
selecting a minimum time for avoiding the impending collision by steering or braking the host vehicle; and
initiating automatic braking of the host vehicle if the selected minimum time exceeds the detected time-to-collision.
1 Assignment
0 Petitions
Accused Products
Abstract
A potential collision is predicted by comparing estimates of the time-to-brake (TTB) and the time-to-turn (TTT) of a host vehicle with a computed time-to-collision (TTC). The collision is deemed to be unavoidable when the smaller of TTB and TTT is greater than TTC. The TTT estimate is based in part on the lateral acceleration capability of the vehicle, and the lateral acceleration is initialized to a low value corresponding to its instantaneous capability, and is set incrementally higher than the actual lateral acceleration when the driver initiates evasive turning. The TTT and TTB estimates are increased by the time required to pre-charge the vehicle brakes so that brake pre-charging can be automatically initiated when required to optimize collision mitigation due to braking.
-
Citations
6 Claims
-
1. A method of mitigating an impending collision of a host vehicle with a target obstacle, comprising the steps of:
-
detecting a time-to-collision between the host vehicle and the target obstacle; calculating a steering radius of the host vehicle based on a velocity of the host vehicle and a lateral acceleration parameter; estimating a time-to-turn for avoiding the impending collision by steering the host vehicle based on the calculated steering radius; estimating a time-to-brake for avoiding the impending collision by braking the host vehicle; selecting a minimum time for avoiding the impending collision by steering or braking the host vehicle; and initiating automatic braking of the host vehicle if the selected minimum time exceeds the detected time-to-collision. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification