METHOD FOR CONTROLLING A VEHICLE

Abstract

The invention relates to a new method for controlling a vehicle (1) moving on a road, wherein the vehicle (1) includes a controller capable of activating an automated function involving strong braking of the vehicle (1). The method includes automated steps consisting in a) after said automated function is complete, collecting information relative to the space in front of the vehicle (1); b) determining whether the space in front of the vehicle (1) is sufficient to enable the vehicle to move forward; and c) only if the space in front of the vehicle (1) is sufficient, reaccelerating.

Claims

1. A method for controlling a vehicle moving on a road, wherein the vehicle includes a controller configured to activate an automated function involving strong braking of the vehicle, the method comprising: after said automated function is complete, electronically collecting information relative to the space in front of the vehicle; electronically determining, by the controller, whether the space in front of the vehicle is sufficient to enable the vehicle to move forward; and only if the space in front of the vehicle is sufficient, automatically reaccelerating by the controller.

2. The method of claim 1, wherein the vehicle is reaccelerated by the controller only if the vehicle is in proper working condition.

3. The method of claim 1, further comprising, prior to reaccelerating: electronically measuring the deceleration of the vehicle during the period of activation of said automated function, electronically comparing the measured deceleration with a specific threshold, wherein the vehicle is reaccelerated, by the controller, only if the measured deceleration is below the specific threshold.

4. The method of claim 3, wherein the specific threshold is identical to that used for activation of an air bag of the vehicle.

5. The method of claim 1, wherein the vehicle is reaccelerated only if the vehicle is between lane markers of the road.

6. The method of claim 1, wherein: electronically collecting information relative to the space in front of the vehicle comprises measuring a distance to the nearest obstacle in front of the vehicle; electronically determining whether the space in front of the vehicle is sufficient to enable the vehicle to move forward comprises determining whether said distance is sufficient to enable the vehicle to reaccelerate; and the vehicle reaccelerates only if said distance is sufficient.

7. The method of claim 6, wherein the distance to the nearest obstacle in front of the vehicle is sufficient to enable the vehicle to reaccelerate if such distance is superior to a threshold value.

8. The method of claim 1, wherein the vehicle is an autonomous vehicle.

9. The method of claim 1, wherein the vehicle is a semi-autonomous vehicle.

10. The method of claim 1, wherein the vehicle is configured to move in a platooning mode wherein the vehicle moves with other vehicles within a platoon of vehicles.

11. The method of claim 1, wherein said automated function is performed by at least one of the following systems integrated in the controller: Advanced Emergency braking system, Adaptive Cruise Control system, Queue assistance system, Automotive distance control system, or Stop and go system.

Description

[0014] The invention will be better understood from reading the following description, given solely by way of several non-limiting examples and with reference to the appended drawings, in which:

[0015] FIG. 1 represents a situation wherein an automated function is performed to apply strong braking;

[0016] FIG. 2 represents a view from above after said automated function is complete;

[0017] FIG. 3 represents another view from above after said automated function is complete, in a configuration other than that of FIG. 2;

[0018] FIG. 4 is a diagram representing the main steps of the method according to the invention.

[0019] FIG. 1 represents schematically a situation of potential collision between a vehicle 1 and an obstacle 3. In the example, the vehicle 1 is a truck moving on a straight road (See arrow F1). However, the invention is obviously applicable to any other type of vehicle. Also, the obstacle 3 is, for the example, a crossing vehicle (See arrow F3), more precisely a vehicle having passed by a red light at an intersection. More generally, it can be any up front vehicle with an important speed gap with our current vehicle.

[0020] There is also another vehicle 2, approaching the truck 1 from behind (See arrow F2).

[0021] In the example, the truck 1 is a semi-autonomous vehicle, meaning that this vehicle cannot be driven without driver on board, but that the vehicle integrates one or more automated functions which, when they are activated (automatically) change the dynamic conditions of the vehicle (speed and/or trajectory). Obviously, the invention is also applicable when the vehicle is fully autonomous, i.e. when the vehicle can be driven without driver on board.

[0022] Typically, the truck 1 includes a controller (not represented) capable of activating an automated function, involving strong braking of the vehicle 1. In a preferred embodiment, said automated function is an advanced emergency braking function that is performed by an Advanced Emergency braking system integrated in the controller. However, in alternative embodiments, the invention is also applicable to any other automated function involving strong braking. In particular, other systems, such as the Adaptive Cruise Control systems, Queue assistance systems, Automotive distance control systems and Stop and go systems may involve strong braking when they are activated.

[0023] In the situation of FIG. 1, advanced emergency braking function is activated to avoid a collision with the vehicle 3 crossing the road in front of the vehicle 1, meaning that strong braking of the truck 1 automatically occurs.

[0024] With respect to FIG. 4, the method of the invention then includes a first step 100 consisting in, after said automated function is complete, collecting information relative to the space in front of the vehicle 1. More precisely, this consists, as shown in FIG. 2, in measuring the distance d to the nearest obstacle 4 in front of the vehicle 1.

[0025] Typically, such information can be collected by a radar 10 or any other detection device arranged at the front (longitudinal) end of the vehicle and transmitted to the controller of the truck 1. Alternatively, the radar 10 may be replaced by an ultrasonic sensor, a laser sensor, a Lidar sensor, a camera or any sensor being able to give an indication about the distance with an upfront obstacle. The distance information can also be collected by any other vehicle to vehicle communication means giving the exact position of each and single vehicle in the surrounding, etc.

[0026] The radar 10 or any comparable measuring means, has a measurement field which extends in front of the vehicle, i.e. in the longitudinal direction of the vehicle. Advantageously, in the example, this measurement field is represented as a detection cone. Accordingly, the measurement field extends across the entire width of the vehicle, meaning that the measuring means is able to detect any obstacle in front of the vehicle 1.

[0027] The radar 10 (or any comparable measuring means in replacement) assesses the presence of obstacle(s) in the measurement field. It is then possible to determine which obstacle is the nearest one from the vehicle and at which distance is this obstacle from the vehicle 1.

[0028] Then, it is determined, at a step 102 whether the space in front of the vehicle 1 is sufficient to enable the vehicle 1 to move forward. More precisely, it is determined whether the distance d is sufficient to enable the vehicle 1 to reaccelerate.

[0029] In practice, the distance d to the nearest obstacle 4 in front of the vehicle 1 is considered as being sufficient to enable the vehicle 1 to reaccelerate if such distance d is superior to a threshold value, for example superior to 5 meters. Accordingly, step 102 consists in comparing the measured distance d with said threshold value.

[0030] Step 102 is performed by the controller of the truck itself, which preferably includes a processing unit capable of processing the information.

[0031] Afterwards, the method consists, at a step 110, in reaccelerating only if the space in front of the vehicle is sufficient, i.e. only if said distance d is sufficient. One then understands that the condition of having sufficient space in front of the vehicle is necessary for allowing the vehicle to move forward. This means that if the distance d is not sufficient to enable the vehicle 1 to reaccelerate, then there is no automatic reacceleration and the method is ended (Step 108).

[0032] Preferably, when the vehicle has decided to reaccelerate, the gap with the upfront vehicle can be closed to a tiny distance like a few dozens of cm (e.g. 30 cm).

[0033] Preferably, the method includes another step 104 prior to step 110, consisting in checking, after said automated function is complete, whether the vehicle is in proper working condition. Then, at step 110, the vehicle 1 is reaccelerated only if the vehicle is in proper working condition.

[0034] In practice, an electronic control unit (ECU) constantly receives measurements from at least one sensor, in particular from at least one accelerometer. This sensor is designed for measuring the acceleration (and deceleration) of the vehicle in the forward (longitudinal) direction.

[0035] A collision algorithm, integrated in the controller, includes a step of calculating one or more physical criteria. In particular, if the measured deceleration is higher than a specific threshold, then it is determined that the vehicle has been involved in an accident. Accordingly, the step of reacceleration is not computed. This kind of algorithm is known as such, as it is already implemented for triggering the activation of the air bags.

[0036] For example, when a collision has occurred, it may be determined that the vehicle is no more in proper condition to move forward again. More precisely, when the measured deceleration is higher than said specific threshold, a signal can be sent to the controller for informing the controller of an accident. Accordingly, there is no automatic reacceleration (Step 108). In this specific situation, the driver must regain control to move the vehicle forward again, provided that the vehicle is still in conditions to move. If the truck has collided with the upfront vehicle, we do not execute the automatic reacceleration as it would be hard to monitor the basic vehicle functions availability (Acceleration, breaking, direction, upfront distance calculation means etc. . . . ).

[0037] Advantageously, and as represented on FIG. 3, the method includes another step 106 prior to step 110, consisting in checking, after said automated function is complete, whether the vehicle is between the lane markers L1 and L2 of the road. Then, at step c), the vehicle is reaccelerated only if the vehicle is still between the lane markers L1 and L2. Typically, and in known manner, a camera 12 may be mounted in the front (longitudinal) end of the vehicle to detect the lanes L1 and L2 of the road. The images captured by the camera 12 can then be processed to determine if the vehicle is between the lanes L1 and L2 or across the road. Obviously, if after the strong automatic braking, the vehicle 1 comes across the road (as in the configuration of FIG. 3), there is no reacceleration (Step 108).

[0038] Steps 100 to 110 are automated steps, i.e. steps that are executed by the vehicle controller. In other words, these steps are not manually executed by the driver or any other person.

[0039] In an alternative embodiment, the vehicle is capable of moving in a platooning mode wherein the vehicle moves with other vehicles within a platoon of vehicles and the method described above is implemented only when the vehicle is in platooning mode.

[0040] The features of the example and of non-represented alternative embodiments may be combined to generate new embodiments of the invention.