JP2010143551A - Driving assistance system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving assistance system allowing improvement of mileage performance of a vehicle for following travel control. <P>SOLUTION: This driving assistance system 1 allows the following travel control controlling a vehicular gap between one's own vehicle and a proceeding vehicle to a prescribed target vehicular gap and vehicle speed maintenance control controlling a vehicle speed of the own vehicle to a prescribed target vehicle speed. The driving assistance system 1 includes: a speed fluctuation decision means 32 deciding speed fluctuation of the proceeding vehicle; the proceeding vehicle speed acquisition means 23 acquiring a vehicle speed of the proceeding vehicle; and a target vehicle speed resetting means 33 resetting the target vehicle speed of the own vehicle. When it is decided that the speed fluctuation of the proceeding vehicle is larger than a prescribed threshold value, the following travel control is suspended or stopped. The target vehicle speed of the own vehicle is reset based on the vehicle speed of the proceeding vehicle, and the vehicle speed maintenance control is performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a driving support system, and more particularly to a driving support system that can improve the fuel efficiency of a vehicle during follow-up running control.

  In recent years, driving support systems can perform follow-up running control in which the inter-vehicle distance between the host vehicle and the preceding vehicle (the vehicle traveling in front of the host vehicle) is controlled to a predetermined target inter-vehicle distance. As a conventional driving assistance system (automobile travel control device) that employs such a configuration, a technique described in Patent Document 1 is known.

JP-A-7-69095

  Here, in the conventional travel support system, if the vehicle speed of the front vehicle fluctuates during the follow-up traveling with the front vehicle as the target vehicle, the vehicle speed of the host vehicle also fluctuates accordingly. At this time, if the front vehicle repeatedly accelerates and decelerates and the vehicle speed of the front vehicle fluctuates greatly, the fuel consumption of the host vehicle may deteriorate due to the influence.

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a driving support system capable of improving the fuel efficiency of a vehicle during follow-up traveling control.

  In order to achieve the above object, a driving support system according to the present invention is a follow-up running that controls a distance between an own vehicle and a vehicle traveling in front of the own vehicle (hereinafter referred to as a preceding vehicle) to a predetermined target distance between vehicles. A driving support system capable of performing control and vehicle speed maintenance control for controlling the vehicle speed of the host vehicle to a predetermined target vehicle speed, wherein the vehicle further travels further ahead of the front vehicle, speed variation determining means for determining the speed variation of the front vehicle A front vehicle speed acquisition means for acquiring a vehicle speed of a vehicle or a group of vehicles (hereinafter referred to as a destination vehicle), and a target vehicle speed resetting means for resetting the target vehicle speed of the host vehicle, and the front vehicle When it is determined that the speed fluctuation of the vehicle is larger than a predetermined threshold, the following traveling control is interrupted or stopped, and the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, so that the vehicle speed maintenance control is performed. But And wherein the dividing.

  In this driving support system, (1) the follow-up driving control is interrupted when it is determined that the speed fluctuation of the front car is larger than a predetermined threshold during execution or start of the follow-up running control with the front car as the target vehicle. Or it is canceled. In such a configuration, when the speed fluctuation of the front vehicle is large, the follow-up traveling control for the front vehicle is interrupted, so that a situation in which the vehicle speed of the host vehicle increases or decreases due to the influence of the front vehicle is suppressed. Accordingly, there is an advantage that the fuel efficiency performance of the host vehicle is improved as compared with the configuration in which the follow-up traveling control is continued regardless of the speed fluctuation of the front vehicle. Further, (2) the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, and vehicle speed maintenance control is performed. In such a configuration, the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle as the target vehicle speed. Therefore, the vehicle speed fluctuation of the host vehicle is compared with the configuration in which the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle having a large speed fluctuation as the target vehicle speed. Is reduced. Thereby, there exists an advantage which the fuel consumption performance of the own vehicle improves effectively.

  In the driving support system according to the present invention, the speed fluctuation of the front vehicle is acquired as the number of times the sign of the relative vehicle speed between the host vehicle and the front vehicle changes within a predetermined time.

  In this driving support system, the evaluation of the speed variation of the front vehicle is appropriately performed, so that the evaluation of the inter-vehicle distance variation between the host vehicle and the front vehicle (evaluation of approaching or moving away) is appropriately performed. Accordingly, there is an advantage that the follow-up running control is appropriately interrupted or stopped, and the fuel efficiency of the own vehicle is effectively improved. It should be noted that the threshold value for the speed fluctuation of the front vehicle (the threshold value for the number of times the sign of relative vehicle speed is switched) can be selected as appropriate.

  In the driving support system according to the present invention, the speed fluctuation of the front vehicle is estimated based on a comparison result between the vehicle speed of the front vehicle and the vehicle speed of the preceding vehicle.

  In this driving support system, for example, when the preceding vehicle decelerates after acceleration or accelerates after decelerating due to the relationship with the vehicle speed of the preceding vehicle, based on the comparison result between the vehicle speed of the preceding vehicle and the vehicle speed of the preceding vehicle, Speed fluctuation is estimated. Then, when the speed fluctuation is larger than a predetermined threshold, the follow-up traveling control is interrupted or stopped. Accordingly, there is an advantage that the follow-up running control is appropriately interrupted or stopped, and the fuel efficiency of the own vehicle is effectively improved.

  In the driving support system according to the present invention, when the preceding vehicle is a vehicle group traveling further ahead of the preceding vehicle, the average vehicle speed of the vehicle group is used as the vehicle speed of the preceding vehicle.

  In this driving support system, since vehicle speed maintenance control is performed with the vehicle speed of an appropriate vehicle ahead as a target vehicle speed, there is an advantage that the vehicle speed fluctuation of the host vehicle is effectively reduced and the fuel consumption performance of the host vehicle is improved.

  Further, the driving support system according to the present invention is configured by infrastructure equipment in which the preceding vehicle vehicle speed acquisition means measures the vehicle speed or the traffic volume of the preceding vehicle.

  In this driving support system, since an appropriate vehicle speed of the ahead vehicle is acquired, there is an advantage that vehicle speed maintenance control with the vehicle speed of the ahead vehicle as the target vehicle speed is appropriately performed.

  In the driving support system according to the present invention, the speed fluctuation of the front vehicle is calculated based on the difference between the vehicle speed of the preceding vehicle and the vehicle speed of the front vehicle, and the speed fluctuation is larger than a predetermined threshold value. In such a case, the vehicle speed maintenance control in which the vehicle speed of the preceding vehicle is set as the target vehicle speed of the host vehicle is prohibited.

  When the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle as the target vehicle speed when the difference (speed fluctuation) between the vehicle speed of the preceding vehicle and the vehicle speed of the preceding vehicle is greater than a predetermined threshold, Since the vehicle speed is higher than the vehicle speed, the host vehicle may be too close to the previous vehicle. Therefore, in such a case, vehicle speed maintenance control in which the vehicle speed of the ahead vehicle is set to the target vehicle speed of the host vehicle is prohibited. Thereby, the situation where the own vehicle and the front vehicle are too close is prevented, and there is an advantage that safe traveling of the own vehicle is ensured.

  In the driving support system according to the present invention, (1) during the start or at the start of the follow-up running control with the front vehicle as the target vehicle, the follow-up running when it is determined that the speed fluctuation of the front vehicle is greater than a predetermined threshold. Control is interrupted or aborted. In such a configuration, when the speed fluctuation of the front vehicle is large, the follow-up traveling control for the front vehicle is interrupted, so that a situation in which the vehicle speed of the host vehicle increases or decreases due to the influence of the front vehicle is suppressed. Accordingly, there is an advantage that the fuel efficiency performance of the host vehicle is improved as compared with the configuration in which the follow-up traveling control is continued regardless of the speed fluctuation of the front vehicle. Further, (2) the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, and vehicle speed maintenance control is performed. In such a configuration, the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle as the target vehicle speed. Therefore, the vehicle speed fluctuation of the host vehicle is compared with the configuration in which the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle having a large speed fluctuation as the target vehicle speed. Is reduced. Thereby, there exists an advantage which the fuel consumption performance of the own vehicle improves effectively.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

  FIG. 1 is a configuration diagram showing a driving support system according to an embodiment of the present invention. 2 to 5 are a flowchart (FIGS. 2 to 4) and an explanatory diagram (FIG. 5) showing the operation of the driving support system shown in FIG.

[Driving support system]
The driving support system 1 is a system that controls the traveling of the vehicle. For example, the following traveling control that controls the inter-vehicle distance between the host vehicle and the preceding vehicle (the vehicle traveling in front of the host vehicle) to a predetermined target inter-vehicle distance. Further, vehicle speed maintenance control for controlling the vehicle speed to a predetermined target vehicle speed can be performed. The driving support system 1 is applied to, for example, an ACC (Auto Cruise Control) system for reducing the burden of driving operation of the driver.

  The driving support system 1 includes information acquisition means 2, a control unit 3, and a vehicle travel control device 4 (see FIG. 1). The information acquisition unit 2 includes an inter-vehicle distance sensor 21, a vehicle speed sensor 22, and a preceding vehicle vehicle speed acquisition unit 23. The inter-vehicle distance sensor 21 is a sensor that measures the inter-vehicle distance between the host vehicle and the preceding vehicle, and is configured by, for example, a millimeter wave radar. The vehicle speed sensor 22 is a sensor that measures the traveling speed of the host vehicle, and includes, for example, a magnetic sensor attached to each wheel of the host vehicle. The preceding vehicle vehicle speed acquisition means 23 is a means for acquiring information relating to the vehicle speed of a vehicle or a vehicle group (a preceding vehicle) traveling further ahead of the preceding vehicle. This destination vehicle vehicle speed acquisition means 23 is comprised by the communication means for acquiring required information from the infrastructure installation arrange | positioned on the road, for example. The control unit 3 is an ECU (Electronic Control Unit), and a follow-up running control unit 31 for performing follow-up running control, a speed fluctuation determining unit 32 that judges speed fluctuation of the preceding vehicle, and a target vehicle speed of the vehicle are reset. And a target vehicle speed resetting unit 33 and a vehicle speed maintenance control unit 34 for performing vehicle speed maintenance control. The vehicle travel control device 4 is a device that controls the travel of the vehicle. The vehicle travel control device 4 includes an accelerator control device 41 that adjusts the accelerator opening, a brake control device 42 that controls the braking force of each wheel, and a shift position control device 43 that controls the shift position.

  In the driving support system 1, follow-up traveling control or vehicle speed maintenance control is performed by the control unit 3 controlling the vehicle traveling control device 4 based on the output values of the information acquisition means sensors 21 to 23. In the follow-up running control, the accelerator opening, the braking force of each wheel, the shift position, and the like are automatically controlled so that the inter-vehicle distance between the host vehicle and the preceding vehicle becomes a preset target inter-vehicle distance. In the vehicle speed maintenance control, the accelerator opening, the braking force of each wheel, the shift position, and the like are automatically controlled so that the traveling speed of the host vehicle is maintained at a predetermined target vehicle speed. Further, the follow-up running control and the vehicle speed maintenance control are appropriately switched according to the running conditions. This ensures proper traveling of the vehicle.

[Vehicle travel control]
Here, if the vehicle speed of the front vehicle fluctuates during the follow-up running with the front vehicle as the target vehicle, the vehicle speed of the own vehicle fluctuates following this (see FIG. 5). At this time, if the front vehicle repeatedly accelerates and decelerates and the vehicle speed of the front vehicle fluctuates greatly, the fuel consumption of the host vehicle may deteriorate due to the influence. For example, it is assumed that during the follow-up running control in which the front vehicle A is the target vehicle, the front vehicle A repeatedly accelerates and decelerates, resulting in a large speed fluctuation Va. At this time, considering the situation where the preceding vehicle A decelerates to the vehicle speed x, if the vehicle speed y of the preceding vehicle B (or vehicle group C) is faster than the vehicle speed x of the preceding vehicle A that has been decelerated, the preceding vehicle A will eventually become It is expected that the vehicle will accelerate and approach the destination vehicle B. Conversely, considering the situation where the front vehicle A accelerates to a vehicle speed x ′, if the vehicle speed y of the front vehicle B is slower than the vehicle speed x ′ of the front vehicle A that has decelerated, the front vehicle A will eventually decelerate and the front vehicle A It is expected to move away from the vehicle B. In these situations, the front car A accelerates after deceleration or decelerates after acceleration. For this reason, if the own vehicle performs follow-up running control with the front vehicle A as the target vehicle, the vehicle will follow the acceleration / deceleration of the previous vehicle due to the influence, and the fuel consumption of the own vehicle will be reduced. Getting worse.

  Therefore, in the driving support system 1, vehicle travel control is performed as follows (see FIG. 2). First, the speed variation of the front vehicle is determined during or at the start of the follow-up running control with the front vehicle as the target vehicle (speed variation determination step ST1). When the speed fluctuation of the front vehicle is larger than a predetermined threshold value, the follow-up running control is interrupted.

  Specifically, first, the inter-vehicle distance and relative vehicle speed between the host vehicle and the preceding vehicle are calculated (ST11) (see FIG. 3). The inter-vehicle distance and the relative vehicle speed are calculated by the control unit 3 based on the output value of the inter-vehicle distance sensor 21 and the output value of the vehicle speed sensor 22. Next, the speed fluctuation Va of the front vehicle is calculated (ST12). This speed fluctuation Va is acquired as, for example, the number of times the sign of the relative vehicle speed is switched within a predetermined time. Next, it is determined whether or not the speed fluctuation Va of the front vehicle and the predetermined threshold value Vmax have a relationship of Va> Vmax (ST13). If it is determined in ST13 that Va> Vmax, the follow-up traveling control for the front vehicle is interrupted (ST14). That is, when the speed fluctuation Va of the front vehicle is large, the follow-up traveling control for the front vehicle is interrupted, so that a situation in which the vehicle speed of the host vehicle increases or decreases due to the influence of the front vehicle is suppressed. Thereby, compared with the structure in which the follow-up running control is continued regardless of the speed fluctuation Va of the front vehicle, the deterioration of the fuel consumption of the own vehicle is suppressed. On the other hand, if it is not determined in ST13 that Va> Vmax, the following traveling control for the preceding vehicle is continued as it is (ST15).

  Next, when step ST14 is executed and the follow-up running control is interrupted, the target vehicle speed is reset (target vehicle speed resetting step ST2) (see FIGS. 2 and 4). Specifically, first, the average vehicle speed of the destination vehicle is acquired (ST21). The average vehicle speed of the destination vehicle is acquired from the infrastructure equipment on the road by the destination vehicle speed acquisition means 23. For example, the average vehicle speed of a group of vehicles traveling in front of a distance that is 0.2 times to 0.3 times the vehicle speed of the host vehicle is acquired. Next, the target vehicle speed of the host vehicle is reset based on the average vehicle speed of the destination vehicle (target vehicle speed resetting step ST22). For example, in this embodiment, the target vehicle speed of the own vehicle is reset to the same speed as the average vehicle speed of the destination vehicle.

  And vehicle speed maintenance control is performed based on the target vehicle speed reset in step ST22 (target vehicle speed maintenance step ST3). That is, during follow-up running control with the front vehicle as the target vehicle, when the speed fluctuation of the front vehicle is greater than a predetermined threshold, the average vehicle speed of the destination vehicle is set to the target vehicle speed of the own vehicle and vehicle speed maintenance control is performed. As a result, useless acceleration / deceleration due to the influence of the front vehicle is reduced, so useless acceleration / deceleration of the host vehicle is reduced and fuel efficiency is improved.

  The following is assumed as a specific example of such vehicle travel control (see FIG. 5). For example, it is assumed that a large vehicle speed fluctuation Va occurs due to repeated acceleration / deceleration of the front vehicle A during follow-up traveling control with the front vehicle A as the target vehicle. At this time, a situation is considered in which the front vehicle A accelerates from a vehicle speed of 50 [km / h] to 60 [km / h]. If the preceding vehicle B (or vehicle group C) is traveling at a vehicle speed 55 [km / h] slower than the vehicle speed of the preceding vehicle A, the preceding vehicle A may eventually decelerate and move away from the preceding vehicle B. is expected. Therefore, when the vehicle speed fluctuation Va of the front vehicle is large (determined as Va> Vmax in the above determination step ST3), the follow-up running control is interrupted (ST11), which is useless due to the influence of the front vehicle. Acceleration / deceleration is reduced. Thereby, useless acceleration / deceleration of the own vehicle is reduced, and fuel efficiency is improved.

[effect]
As described above, in the driving support system 1, (1) the speed fluctuation Va of the front vehicle is larger than a predetermined threshold value (Va>) during execution or at the start of the follow-up running control with the front vehicle as the target vehicle. When Vmax is determined, the follow-up running control is interrupted or stopped (ST13 and ST14) (see FIGS. 1 and 2). In such a configuration, when the speed fluctuation Va of the front vehicle is large, the follow-up traveling control for the front vehicle is interrupted, so that a situation in which the vehicle speed of the host vehicle increases or decreases due to the influence of the front vehicle is suppressed. Accordingly, there is an advantage that the fuel consumption performance of the own vehicle is improved as compared with the configuration in which the follow-up traveling control is continued regardless of the speed fluctuation Va of the front vehicle. Further, (2) the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, and vehicle speed maintenance control is performed (ST21 and ST22). In such a configuration, since the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle as the target vehicle speed, the vehicle speed of the host vehicle is compared with the configuration in which the vehicle speed maintenance control is performed with the vehicle speed of the preceding vehicle having a large speed fluctuation Va as the target vehicle speed. Variability is reduced. Thereby, there exists an advantage which the fuel consumption performance of the own vehicle improves effectively.

[Additional matters]
In the driving support system 1, the speed fluctuation Va of the front vehicle is acquired as the number of times the sign of the relative vehicle speed between the host vehicle and the front vehicle changes within a predetermined time. In such a configuration, the evaluation of the speed fluctuation Va of the front vehicle is appropriately performed, so that the evaluation of the inter-vehicle distance fluctuation between the host vehicle and the front vehicle (evaluation of approaching or moving away) is appropriately performed. Accordingly, there is an advantage that the follow-up running control is appropriately interrupted or stopped, and the fuel efficiency of the own vehicle is effectively improved. It should be noted that the threshold value of the speed fluctuation Va of the front vehicle (the threshold value of the number of times the relative vehicle speed is switched) can be selected as appropriate.

  Further, the present invention is not limited to this, and the speed fluctuation Va of the front vehicle may be estimated based on a comparison result between the vehicle speed of the front vehicle and the vehicle speed of the destination vehicle. In such a configuration, for example, when the preceding vehicle decelerates after acceleration or accelerates after decelerating due to the relationship with the vehicle speed of the preceding vehicle, the speed variation of the preceding vehicle is based on the comparison result between the vehicle speed of the preceding vehicle and the vehicle speed of the preceding vehicle. Va is estimated. When the speed fluctuation Va is larger than a predetermined threshold value, the follow-up running control is interrupted or stopped. Accordingly, there is an advantage that the follow-up running control is appropriately interrupted or stopped, and the fuel efficiency of the own vehicle is effectively improved.

  For example, when the vehicle speed after acceleration of the preceding vehicle is greater than the vehicle speed of the preceding vehicle, there is a high possibility that the preceding vehicle will eventually decelerate to the vehicle speed of the preceding vehicle, and the vehicle speed after deceleration of the preceding vehicle is When the vehicle speed is smaller than the vehicle speed, there is a high possibility that the preceding vehicle will accelerate to the speed of the vehicle ahead. Therefore, the width of the speed fluctuation Va of the front vehicle can be estimated by comparing the vehicle speed of the front vehicle and the vehicle speed of the preceding vehicle. Then, when the width of the speed fluctuation Va is larger than a predetermined threshold value Vmax, the follow-up traveling control is interrupted or stopped. Thereby, vehicle travel control is performed appropriately.

  In the driving support system 1, when the destination vehicle is a vehicle group that travels further ahead of the preceding vehicle, it is preferable that the average vehicle speed of the vehicle group is used as the vehicle speed of the destination vehicle. In such a configuration, since vehicle speed maintenance control is performed with the vehicle speed of an appropriate ahead vehicle as the target vehicle speed, there is an advantage that the vehicle speed fluctuation of the own vehicle is effectively reduced and the fuel efficiency performance of the own vehicle is improved.

  Further, in this driving support system 1, it is preferable that the preceding vehicle vehicle speed acquisition means 23 is constituted by infrastructure equipment for measuring the vehicle speed or traffic volume of the preceding vehicle. As a result, an appropriate vehicle speed of the ahead vehicle is acquired, and thus there is an advantage that vehicle speed maintenance control with the vehicle speed of the ahead vehicle as the target vehicle speed is appropriately performed.

  Further, in this driving support system 1, the speed fluctuation Va of the front vehicle is calculated based on the difference between the vehicle speed of the preceding vehicle and the vehicle speed of the front car, and when the speed fluctuation Va is larger than a predetermined threshold value, It is preferable that vehicle speed maintenance control in which the vehicle speed of the vehicle ahead is the target vehicle speed of the host vehicle is prohibited (not shown). When the vehicle speed maintenance control is performed with the vehicle speed of the vehicle ahead as the target vehicle speed when the difference (speed fluctuation Va) between the vehicle speed of the vehicle ahead and the vehicle speed of the vehicle ahead is greater than a predetermined threshold, the vehicle speed of the vehicle Since it is faster than the vehicle speed of the previous vehicle, there is a risk that the vehicle is too close to the previous vehicle. Therefore, in such a case, vehicle speed maintenance control in which the vehicle speed of the ahead vehicle is set to the target vehicle speed of the host vehicle is prohibited. Thereby, the situation where the own vehicle and the front vehicle are too close is prevented, and there is an advantage that safe traveling of the own vehicle is ensured.

  For example, it is assumed that a large vehicle speed fluctuation Va occurs due to repeated acceleration / deceleration of the front vehicle A during follow-up traveling control with the front vehicle A as the target vehicle (see FIG. 5). At this time, a situation is considered in which the front vehicle A decelerates from a vehicle speed of 60 [km / h] to 50 [km / h]. Here, if it is determined that the speed fluctuation Va of the front vehicle is larger than a predetermined threshold (Va> Vmax), the follow-up running control with the front vehicle as the target vehicle is interrupted (ST13 and ST14) (see FIG. 2). ). Then, the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, and vehicle speed maintenance control is performed (ST21 and ST22). At this time, if the preceding vehicle B (or the vehicle group C) is traveling at a vehicle speed 70 [km / h] that is faster than the vehicle speed of the preceding vehicle A, the target vehicle speed of the host vehicle is 70 [km / h]. Then, there is a possibility that the inter-vehicle distance between the own vehicle and the front vehicle A becomes too narrow temporarily. Therefore, when the difference between the vehicle speed of the preceding vehicle and the vehicle speed of the preceding vehicle (speed fluctuation Va) is larger than a predetermined threshold value, vehicle speed maintenance control that prohibits the vehicle speed of the preceding vehicle to be the target vehicle speed of the own vehicle is prohibited. Such a situation is prevented and safe traveling of the vehicle is ensured.

  As described above, the driving support system according to the present invention is useful in that the fuel consumption performance of the vehicle can be improved during the follow-up running control.

It is a block diagram which shows the driving assistance system concerning the Example of this invention. It is a flowchart which shows the effect | action of the driving assistance system described in FIG. It is a flowchart which shows the effect | action of the driving assistance system described in FIG. It is a flowchart which shows the effect | action of the driving assistance system described in FIG. It is explanatory drawing which shows the effect | action of the driving assistance system described in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driving assistance system 2 Information acquisition means 21 Inter-vehicle distance sensor 22 Vehicle speed sensor 23 Advancing vehicle vehicle speed acquisition means 3 Control part 31 Follow-up travel control part 32 Speed fluctuation | variation determination part (speed fluctuation | variation determination means)
33 Target vehicle speed resetting unit (target vehicle speed resetting means)
34 Vehicle speed maintenance control unit 4 Vehicle travel control device 41 Accelerator control device 42 Brake control device 43 Shift position control device

Claims (6)

Follow-up running control for controlling the distance between the host vehicle and a vehicle traveling in front of the host vehicle (hereinafter referred to as the preceding vehicle) to a predetermined target vehicle distance and vehicle speed maintenance for controlling the host vehicle speed to a predetermined target vehicle speed A driving support system capable of performing control,
Speed variation determination means for determining speed variation of the front vehicle, destination vehicle vehicle speed acquisition means for acquiring a vehicle speed of a vehicle or a vehicle group (hereinafter referred to as a destination vehicle) traveling further ahead of the front vehicle, A target vehicle speed resetting means for resetting the target vehicle speed of the host vehicle, and
When it is determined that the speed fluctuation of the preceding vehicle is greater than a predetermined threshold, the following traveling control is interrupted or stopped, and the target vehicle speed of the own vehicle is reset based on the vehicle speed of the preceding vehicle, and A driving support system characterized in that vehicle speed maintenance control is performed.   The driving support system according to claim 1, wherein the speed fluctuation of the front vehicle is acquired as the number of times of switching of the sign of the relative vehicle speed between the host vehicle and the front vehicle within a predetermined time.   The driving support system according to claim 1, wherein the speed fluctuation of the front vehicle is estimated based on a comparison result between a vehicle speed of the front vehicle and a vehicle speed of the preceding vehicle.   The average vehicle speed of the vehicle group according to any one of claims 1 to 3, wherein when the preceding vehicle is a vehicle group traveling further ahead of the preceding vehicle, an average vehicle speed of the vehicle group is used as a vehicle speed of the preceding vehicle. Driving support system.   The driving support system according to any one of claims 1 to 4, wherein the destination vehicle vehicle speed acquisition unit includes an infrastructure facility that measures a vehicle speed or a traffic volume of the destination vehicle.   The speed fluctuation of the preceding vehicle is calculated based on the difference between the vehicle speed of the preceding vehicle and the vehicle speed of the preceding vehicle, and when the speed fluctuation is greater than a predetermined threshold, the vehicle speed of the preceding vehicle is determined as the own vehicle. The driving support system according to any one of claims 1 to 5, wherein the vehicle speed maintenance control with the target vehicle speed is prohibited.

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