DE102014017522A1 - Method for operating a driver assistance system of a motor vehicle - Google Patents

Abstract

The invention relates to a method for operating a driver assistance system of a motor vehicle (2), by means of which a speed of the motor vehicle (2) can be controlled, with a detection of a permissible maximum speed for a given location by a detection device of the driver assistance system, an automatic setting of the determined maximum speed corresponding maximum value in the driver assistance system and with a cancellation of the setting, if within a predetermined time interval (.DELTA.t) after setting or while the motor vehicle (2) is in a predetermined environment (.DELTA.x) of the predetermined location, a predetermined operating action of a driver of the motor vehicle (2) takes place in order to avoid an erroneous regulatory intervention of a driver assistance system of a motor vehicle (2).

Description

The invention relates to a method for operating a driver assistance system of a motor vehicle according to the preamble of patent claim 1.

In motor vehicles, driver assistance systems often have a detection system by means of which a permissible maximum speed can be detected in a road section which lies in front of the motor vehicle or in which the motor vehicle is located. A detected maximum speed or speed limit is then automatically taken into account, for example, by the driver assistance system designed, for example, as cruise control. With the then from or at a position of the motor vehicle valid speed limit, a set speed of the driver assistance system changes, on which this controls the speed of the motor vehicle.

That's how it describes DE 10 2013 003 215 A1 a method of controlling a vehicle speed by a driver assistance system in which a vehicle speed is temporarily adjusted to a maximum permissible speed by setting the setting speed of the driver assistance system at the maximum permissible speed if the setting speed exceeds the permissible maximum speed. There is an automatic reset to the original setting speed when the maximum speed limit is raised, for example, by other traffic signs and exceeds initial setting speed.

It is an object of the present invention to avoid a falsely or undesirably occurring control intervention of a driver assistance system of a motor vehicle, by means of which a speed of the motor vehicle can be regulated.

This object is solved by the subject matter of the independent claim. Advantageous embodiments will become apparent from the dependent claims, the description and the figure.

The invention relates to a method for operating a driver assistance system of a motor vehicle, wherein a speed of the motor vehicle can be regulated by means of the driver assistance system. The method comprises a series of steps. A first step is detecting a maximum permissible speed for a given location by a detection device of the driver assistance system. The predetermined location can be specified relative to the car. A next step is an automatic setting of a maximum value corresponding to the ascertained maximum speed in the driver assistance system. The setting can also be done for a given location at which the car will be in the future. The automatic setting does not therefore have to have an immediate effect on a regulation of the speed of the motor vehicle by the driver assistance system.

In order to avoid a falsely taking control intervention of the driver assistance system, a cancellation of setting occurs if, within a predetermined time interval after setting or while the car is in a predetermined environment of the predetermined location, a predetermined criterion is met. The predetermined criterion is fulfilled when a predetermined operator action of a driver of the motor vehicle takes place or when a speed change has taken place such that a predefined acceleration threshold or deceleration threshold or speed difference is exceeded in terms of amount. By canceling the setting of the car or the driver assistance system can thus be placed in a state in which the car or the driver assistance system would be, if the detection of the maximum speed and the automatic setting had never taken place. The driver assistance system and / or the motor vehicle can thus be returned to an original state with regard to the regulation of the speed of the motor vehicle, as assumed by the driver assistance system or the motor vehicle before the automatic setting.

This has the advantage that an allowable maximum speed erroneously detected by the driver assistance system can be easily bypassed or corrected by the driver. In addition, the driver can actively discard an error-free speed limit in the driver assistance system, if he considers this necessary for other reasons. Since the automatic setting of the maximum value can take place before the deployment of an effect of setting on the regulation of the speed of the motor vehicle, there is also the great advantage that undesired control intervention of the driver assistance system by the driver can be prevented before the control intervention takes place at all , This also brings the advantage of a resource-saving driving style.

In an advantageous embodiment it is provided that an optical and / or acoustic display of the maximum value to the driver takes place. In this case, the predetermined time interval is predetermined relative to the display, for example relative to a start time of the display. In particular, the time interval includes the start time of the Displaying. This has the advantage that the driver is informed about a future control behavior of the driver assistance system and this, in particular at once, can correct in the predetermined time interval. In particular, the driver can thus prevent the anticipated control intervention by the driver assistance system before it even takes place.

In a further embodiment it is provided that the operator action comprises an actuation of an accelerator pedal and / or a brake pedal. It may be erroneously or undesirably corrected by depressing the accelerator pedal as being too low for a maximum permissible speed. It can also be corrected by pressing the brake pedal incorrectly or unintentionally as too high set maximum value for the determined maximum speed. This has the advantage that the correction of the control intervention can be particularly intuitive for the driver. Moreover, the hands remain free for further operator actions.

The operating action may alternatively or additionally include the operation of another input element, in particular the operation of a provided for operating a speed or distance controller cruise control lever.

In a particularly advantageous embodiment, it is provided that the detection of the permissible maximum speed comprises an evaluation of a speed-relevant traffic sign. In particular, the detection may include a benefit of a camera of the detection device here. In this case, there is the advantage that a faulty detection or a faulty evaluation of a traffic sign, as may occur, for example, under adverse weather conditions, can be corrected by the driver.

In a further embodiment it is provided that the detection of the permissible maximum speed comprises an evaluation of a speed-relevant map information of an electronic map. This results in the advantage that the driver can correct a speed limit that may no longer exist in reality or detect it. A false and unnecessary regulation of the vehicle speed can thus be prevented.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown in the single figure alone are not now usable in the respectively specified combination, but also in other combinations or alone, without the frame to leave the invention.

The single figure shows a schematic representation of a scenario in which an exemplary embodiment of the method according to the invention is applied.

In the single figure is a schematically illustrated street 1 , which is currently in an x-direction, shown. At a starting position x ₀ is present a motor vehicle 2 which is in the x-direction on the road 1 moved along. At two predefined positions x ₄ , x ₇ there is a traffic sign here 3 . 4 , which identifies a speed limit. The street 1 is here divided by eight predetermined positions x ₁ to x ₈ in predetermined sections. In the graph above the respective sections is a locally valid setting speed of a driver assistance system of the motor vehicle 2 shown.

In the example shown, first, when the car 2 is at the position x ₀ , the driver assistance system, such as a cruise control, not yet activated. Accordingly, no setting speed of the driver assistance system is specified and the speed is controlled solely by the driver of the motor vehicle. In the present example, the driver assistance system is at the first position x _{1 of} the road 1 activated by the driver. Accordingly, for example, a value of 113 km / h applies as setting speed v _{s of} the driver assistance system. The car 2 now moves in the x-direction and approaches the traffic sign positioned at the fourth position x ₄ 3 which, in the present case, provides for limiting the maximum speed to 80 km / h. The traffic sign 3 In the example shown, at a second position x ₂ located between the first position x ₁ and the fourth position x ₄ , it enters a detection range of a detection device of the driver assistance system. Accordingly, an automatic setting of the maximum value corresponding to the ascertained maximum speed, in this case 80 km / h, takes place in the driver assistance system. This maximum value is now valid from the fourth position x ₄ , ie as soon as the car is behind the fourth position x ₄ . However, the setting speed v _{s of} the driver assistance system, to which this controls the speed of the motor vehicle, initially remains at the previous value, here 113 km / h.

In the example shown, the recorded maximum value of 80 km / h here is visually a driver of the motor vehicle 2 displayed. In the present case, this takes place simultaneously with the automatic setting, that is to say when the motor vehicle is at the second position x ₂ . The driver now notices with a certain delay, in this case at the time when the car 2 at the third position x ₃ between the second position x ₂ and the fourth position x ₄ , the speed limit detected by the driver assistance system. By a predetermined operating action, such as a brief tapping of an accelerator pedal of the motor vehicle 2 In the present case, the driver now cancels the automatic setting of the maximum value in the driver assistance system at the third position x ₃ . The setting speed of the driver assistance system is still the previous value, here 113 km / h.

Now reaches the car 2 the fourth position x ₄ , so will the car 2 under the present conditions continue to move at the speed of 113 km / h, so the driver assistance system, the speed continue to regulate the same speed, here the 113 km / h. If the driver had not canceled the setting of the maximum value at the third position x ₃ , then at the fourth position x ₄ the setting speed of the driver assistance system would automatically have reached the automatically set maximum value, the traffic signal 3 corresponding value of present 80 km / h, reduced. Accordingly, the speed of the motor vehicle 2 adapted to the recorded maximum speed.

Even if the driver of the motor vehicle 2 would not performed at the position x ₃ canceling the setting, for example, if he had escaped the visual indicators of the maximum value, it could still in a predetermined environment Δ in the example shown, _x, present on a section of road between the fourth position x ₄ and the fifth Position x ₅ , which can perform canceling the setting. In this case, the setting speed of the driver assistance system would have initially reduced to 80 km / h at the position x ₄ and then increased again to the previous value of 113 km / h after the operator's action, for example a brief tapping of the accelerator pedal. However, this cancellation could not take place in the direction behind the fifth position x ₅ in this example.

After the car 2 has passed the fifth position x ₅ , he continues to move at a speed of present 113 km / h on the further traffic sign 4 , which is in the example shown at the seventh position x ₇ , too. It is at the in the direction of travel before the seventh position x ₇ located sixth position x _6, the other traffic sign 4 recognized. In this example, after automatically setting and displaying the maximum value at the sixth position x ₆ , the driver performs within a predetermined time interval Δ _t , which depends on the speed of the motor vehicle 2 corresponds to a certain distance, in the present case a distance which exceeds the distance between the sixth position x ₆ and the seventh position x ₇ , no control action for canceling the setting by. Consequently, at the position x ₇ in the example shown, the setting speed v _{s of} the driver assistance system automatically becomes the value indicative of the traffic sign 4 corresponds, in this case 130 km / h, set.

In the example shown, the driver now notices shortly after the seventh position x ₇ the acceleration of the motor vehicle 2 and can by an operator action, for example a brief tapping of the brake pedal, cancel the automatic setting of the maximum value effected at the position x ₆ and thus reduce the setting speed v _{s of} the driver assistance system to the previous value, in the present case 113 km / h. This is possible in the example shown, since the eighth position x ₈ at which the driver carries out the operator action takes place within a predetermined environment Δ _{x of} the seventh position x ₇ , ie the location of the traffic sign. This environment Δ _x is in the present case passed through a road section of a predetermined length.

LIST OF REFERENCE NUMBERS

1

Street

2

motor vehicle

3

road sign

4

road sign

v _s

setting speed

x ₁

first position

x ₂

second position

x ₃

third position

x ₄

fourth position

x ₅

fifth position

x ₆

sixth position

x ₇

seventh position

x ₈

eighth position environment

Δ _t

time interval

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013003215 A1 [0003]

Claims (5)

Method for operating a driver assistance system of a motor vehicle ( 2 ), by means of which a speed of the motor vehicle ( 2 ), comprising the steps of: - detecting a maximum permissible speed for a given location by a detection device of the driver assistance system; Automatically setting a maximum value corresponding to the ascertained maximum speed in the driver assistance system; characterized by - cancel the setting, if within a predetermined time interval (Δ _t) after setting or during the cars themselves ( 2 ) is in a predetermined environment (Δ _x ) of the predetermined location, a predetermined operation of a driver of the motor vehicle ( 2 ) takes place and / or a speed change of the vehicle takes place such that a predetermined acceleration threshold and / or deceleration threshold and / or speed difference is exceeded in terms of amount. The method of claim 1, characterized by - an optical and / or acoustic display of the maximum value to the driver, wherein the predetermined time interval (Δ _t) is predetermined relative to the display and specifically includes the start time of displaying. Method according to one of the preceding claims, characterized in that the operating action comprises actuation of an accelerator pedal and / or a brake pedal and / or an input element. Method according to one of the preceding claims, characterized in that the detection of the permissible maximum speed is an evaluation of a speed-relevant traffic sign ( 3 . 4 ). Method according to one of the preceding claims, characterized in that the detection of the permissible maximum speed comprises an evaluation of a speed-relevant map information of an electronic map.

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