Determining an activation criterion for a brake application
First Claim
1. A method for automatically activating a brake application in a vehicle having a brake system, the method comprising:
- using at least one detection device, detecting at least one object in the environment of the vehicle; and
using at least one processor;
determining whether the vehicle is on a collision course with the at least one object,when the vehicle is on a collision course with the at least one object, determining an S-shaped avoidance trajectory of the vehicle and at least one avoidance criterion based at least in part on the S-shaped avoidance trajectory,determining at least one extreme value of a transverse acceleration of the vehicle from the S-shaped avoidance trajectory,comparing the at least one extreme value with a first transverse acceleration threshold value and a second transverse acceleration threshold valueoutputting a brake warning signal when the at least one extreme value exceeds the first transverse acceleration threshold but falls below the second transverse acceleration threshold value, andoutputting a brake control signal to the brake system to automatically effect activation of the brake application in the vehicle when the at least one extreme value exceeds the second transverse acceleration threshold value.
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Accused Products
Abstract
To determine an activation criterion for outputting brake signals to a vehicle brake system at least one object in the environment of the vehicle is detected. A determination is made whether the vehicle is on a collision course with the object. If so, at least one avoidance criterion is determined, wherein an S-shaped avoidance trajectory of the vehicle is determined, from which at least one extreme value of a lateral acceleration of the vehicle is determined. The extreme value is compared with at least one threshold value. The avoidance criterion is met if the associated extreme value falls below the threshold value, and the activation criterion for the brake application is not met as long as the avoidance criterion is met.
17 Citations
23 Claims
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1. A method for automatically activating a brake application in a vehicle having a brake system, the method comprising:
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using at least one detection device, detecting at least one object in the environment of the vehicle; and using at least one processor; determining whether the vehicle is on a collision course with the at least one object, when the vehicle is on a collision course with the at least one object, determining an S-shaped avoidance trajectory of the vehicle and at least one avoidance criterion based at least in part on the S-shaped avoidance trajectory, determining at least one extreme value of a transverse acceleration of the vehicle from the S-shaped avoidance trajectory, comparing the at least one extreme value with a first transverse acceleration threshold value and a second transverse acceleration threshold value outputting a brake warning signal when the at least one extreme value exceeds the first transverse acceleration threshold but falls below the second transverse acceleration threshold value, and outputting a brake control signal to the brake system to automatically effect activation of the brake application in the vehicle when the at least one extreme value exceeds the second transverse acceleration threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for automatically activating a brake application in a vehicle having a brake system, the method comprising:
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using at least one detection device, detecting at least one object in the environment of the vehicle; and using at least one processor; determining whether the vehicle is on a collision course with the at least one object, when the vehicle is on a collision course with the at least one object, determining an S-shaped avoidance trajectory of the vehicle and at least one avoidance criterion based at least in part on the S-shaped avoidance trajectory, determining at least one extreme value of a transverse acceleration of the vehicle from the S-shaped avoidance trajectory, determining whether the at least one avoidance criteria is fulfilled by comparing the at least one extreme value with at least one threshold value, wherein the avoidance criteria is fulfilled when the at least one extreme value falls below the at least one threshold value, and activating an automatic brake application in the vehicle when an activation criterion for the automatic brake application is fulfilled, wherein the activation criterion for the automatic brake application is not fulfilled as long as the at least one avoidance criterion is fulfilled, wherein the S-shaped avoidance trajectory is produced according to a function T(k)=a*k+b*sin(c*k), wherein k is a trajectory parameter, T(k) is a trajectory based upon the trajectory parameter k, and a, b and c are scale parameters that are based upon (i) a distance between the vehicle and the at least one object, (ii) a lateral displacement between the vehicle and the at least one object, and (iii) a width of the vehicle and the at least one object.
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23. A method for automatically activating a brake application in a vehicle having a brake system, the method comprising:
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using at least one detection device, detecting multiple objects in the environment of the vehicle; determining that a distance between adjacent ones of the multiple objects is less than one of a width and a scaled width of the vehicle, and in response, combining the multiple objects to form one common object area, and using at least one processor; determining whether the vehicle is on a collision course with the common object area, when the vehicle is on a collision course with the common object area, determining an S-shaped avoidance trajectory of the vehicle and at least one avoidance criterion based at least in part on the S-shaped avoidance trajectory, determining at least one extreme value of a transverse acceleration of the vehicle from the S-shaped avoidance trajectory, determining whether the at least one avoidance criteria is fulfilled by comparing the at least one extreme value with at least one threshold value, wherein the avoidance criteria is fulfilled when the at least one extreme value falls below the at least one threshold value, and activating an automatic brake application in the vehicle when an activation criterion for the automatic brake application is fulfilled, wherein the activation criterion for the automatic brake application is not fulfilled as long as the at least one avoidance criterion is fulfilled.
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Specification