WO2022259643A1 - 走行支援装置 - Google Patents
走行支援装置 Download PDFInfo
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- WO2022259643A1 WO2022259643A1 PCT/JP2022/008418 JP2022008418W WO2022259643A1 WO 2022259643 A1 WO2022259643 A1 WO 2022259643A1 JP 2022008418 W JP2022008418 W JP 2022008418W WO 2022259643 A1 WO2022259643 A1 WO 2022259643A1
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- WIPO (PCT)
- Prior art keywords
- vehicle
- driving support
- situation
- support device
- adjacent
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/10—Path keeping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D15/00—Steering not otherwise provided for
- B62D15/02—Steering position indicators ; Steering position determination; Steering aids
- B62D15/025—Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18163—Lane change; Overtaking manoeuvres
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/58—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/588—Recognition of the road, e.g. of lane markings; Recognition of the vehicle driving pattern in relation to the road
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/167—Driving aids for lane monitoring, lane changing, e.g. blind spot detection
Definitions
- the present disclosure relates to a driving support device.
- Patent Document 1 a driving support device configured to execute steering control based on the surrounding conditions of the vehicle.
- the vehicle equipped with the above driving support device will be referred to as “own vehicle”, and the vehicles that exist around the subject vehicle will be referred to as “other vehicles”. Further, the lane in which the own vehicle travels is called “own lane”, and the lane adjacent to the own lane is called “adjacent lane”.
- the present disclosure provides a driving support device capable of executing steering control according to each situation described above.
- a driving assistance device includes at least one sensor that acquires vehicle surrounding information about a surrounding area of the own vehicle, and a determination that determines whether the current situation is a first situation or a second situation based on the vehicle surrounding information. and at least one processor configured to execute a process and, based on a result of the determination process, execute steering control to cause the host vehicle to travel along a target trajectory.
- the first situation is a situation in which the own vehicle overtakes a first other vehicle traveling in a first adjacent lane adjacent to the own lane in which the own vehicle is traveling.
- the second situation is a situation in which the own vehicle is overtaken by the first other vehicle.
- the driving support device can execute steering control according to whether the current situation is the first situation or the second situation. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
- FIG. 1 is a diagram showing a configuration of a driving support device;
- FIG. It is a figure which showed the structure of driving
- FIG. 2 is a diagram showing a situation (first situation) in which a host vehicle overtakes a first adjacent vehicle traveling in a first adjacent lane; It is an example of a map for obtaining a correction value dc for the lateral position of the own vehicle.
- FIG. 1 is a diagram showing a configuration of a driving support device
- FIG. 2 is a figure which showed the structure of driving
- FIG. 2 is a diagram showing a situation (first situation) in which a host vehicle overtakes a first adjacent vehicle traveling in a first adjacent lane; It is an example of a map for obtaining a correction value dc for the
- 4 is a diagram showing a situation (second situation) in which the host vehicle is overtaken by a first adjacent vehicle traveling in a first adjacent lane; 4 is a flowchart executed by a driving support ECU in Embodiment 1; 4 is a flowchart executed by a driving support ECU in Embodiment 1; It is the figure which showed the example in which the 2nd adjacent vehicle does not exist in the 2nd adjacent lane in the 1st situation. It is the figure which showed the example in which the 2nd adjacent vehicle exists in the 2nd adjacent lane in the 1st situation. It is the figure which showed the example in which the 2nd adjacent vehicle exists in the 2nd adjacent lane in the 1st situation. It is the figure which showed the example in which the 2nd adjacent vehicle exists in the 2nd adjacent lane in the 1st situation.
- FIG. 10 is an example of a map for obtaining a correction value dc for the lateral position of the host vehicle according to the second embodiment;
- FIG. 9 is a flowchart executed by a driving support ECU in Embodiment 2;
- It is an example of a map for obtaining a correction factor Rc by which the correction value dc is multiplied.
- 14 is a flow chart executed by a driving support ECU in Embodiment 4.
- FIG. FIG. 10 is a diagram showing an example in which another vehicle exists in front of the first adjacent vehicle in the first situation; 14 is a flowchart executed by a driving support ECU in Embodiment 6.
- FIG. 10 is a diagram showing an example in which another vehicle exists in front of the first adjacent vehicle in the first situation;
- 14 is a flowchart executed by a driving support ECU in Embodiment 6.
- FIG. 3 is a diagram for explaining a distance Dy between a first adjacent vehicle and a marking line representing a boundary between a vehicle's own lane and a first adjacent lane; This table is for calculating the reliability DR and shows the relationship between the distance Dy and the added value/subtracted value. A table for calculating the reliability DR and showing the relationship between the distance Dx in the longitudinal direction of the vehicle between the own vehicle and the first adjacent vehicle and the addition value/subtraction value.
- FIG. 4 illustrates a first area for determining a first situation
- FIG. 10 is a diagram showing a second area for determining whether a second adjacent vehicle exists in a second adjacent lane in a first situation;
- Lane Keeping Control will be described below as an example of steering control.
- lane keeping control is simply referred to as "LK control”.
- FIG. 1 is a diagram showing the configuration of a driving support device.
- the driving support device is mounted on a vehicle (self-vehicle) VA.
- the driving support device includes a driving support ECU 110 , a steering ECU 120 , a steering actuator 130 , a vehicle periphery sensor 140 and a vehicle speed sensor 150 .
- FIG. 2 is a diagram showing the configuration of the driving support ECU 110.
- ECU is an abbreviation for electronic control unit, and is an electronic control circuit having a microcomputer as a component.
- the driving assistance ECU 110 includes a CPU 210, a memory 220, a nonvolatile memory 230, an interface 240, and the like.
- the CPU 210 includes at least one processor and/or circuitry.
- Memory 220 includes, for example, RAM.
- Non-volatile memory 230 includes, for example, flash memory and ROM.
- CPU 210 uses memory 220 as a work memory to execute program codes (instructions) stored in nonvolatile memory 230 . Thereby, the CPU 210 can execute the processing described below.
- the steering ECU 120 also has a similar configuration.
- the steering actuator 130 is incorporated in the steering mechanism of the vehicle VA.
- the steering actuator 130 includes a motor for steering the steered wheels (left front wheel and right front wheel) of the vehicle VA.
- the steering actuator 130 is configured to control the steered wheels according to instructions from the steering ECU 120 .
- driving support ECU 110 and the steering ECU 120 may be integrated into one ECU. Additionally, one or more ECUs may be added to perform the processes described below.
- the vehicle surroundings sensor 140 acquires vehicle surroundings information about the surrounding area of the vehicle VA.
- the surrounding area of the vehicle VA includes a front area, a right area, a left area, and a rear area of the vehicle VA.
- the vehicle surrounding information includes object information related to objects existing in the area surrounding the vehicle VA, and lane marking information related to lane markings (white lines) existing in the area surrounding the vehicle VA.
- Objects include moving objects such as vehicles and pedestrians, and stationary objects such as guardrails and fences.
- the object information includes, for example, the distance between the vehicle VA and the object, the moving direction of the object with respect to the vehicle VA, the orientation of the object with respect to the vehicle VA, the relative speed of the object with respect to the vehicle VA, and the type of object (for example, the object moving information on whether it is an object or a stationary object), etc.
- the lane marking information includes the positions of a plurality of lane markings that define lanes, parameters related to the lane markings, and the like.
- the parameters related to the lane marking include the curvature of the lane marking, the lateral position of the vehicle VA with respect to the lane marking (the position in the road width direction), the yaw angle of the vehicle VA with respect to the lane marking, and the like.
- the vehicle surroundings sensor 140 may be one or a combination of radar sensors, camera sensors, LiDAR, and the like.
- the vehicle surroundings sensor 140 may be another sensor as long as it can acquire the above object information and lane marking information.
- the vehicle speed sensor 150 acquires information regarding the speed Va of the vehicle VA.
- FIG. 3 is a diagram for explaining LK control, which is an example of steering control.
- the driving support ECU 110 detects the left lane line LL and the right lane line RL based on the vehicle peripheral information (lane line information).
- the driving assistance ECU 110 recognizes the area between the left lane line LL and the right lane line RL as the area (that is, the lane) in which the vehicle VA should travel.
- the driving assistance ECU 110 sets a line connecting the center positions in the road width direction between the left lane marking LL and the right lane marking RL as the center line Lc. Then, the driving assistance ECU 110 sets the center line Lc as the target trajectory TL for the LK control.
- the travel assistance ECU 110 calculates a steering control amount (for example, steering torque) for causing the vehicle VA to travel along the target trajectory TL.
- the driving assistance ECU 110 outputs the steering control amount to the steering ECU 120 .
- the steering ECU 120 controls the steering actuator 130 based on the steering control amount.
- the vehicle VA equipped with the driving support device is hereinafter referred to as "self-vehicle VA".
- the lane in which the own vehicle VA travels is called “own lane Ln0”
- the lane adjacent to the left side of own lane Ln0 is called “first adjacent lane Ln1”
- the lane adjacent to the right side of own lane Ln0 is called It is called “second adjacent lane Ln2”.
- Other vehicles traveling in the first adjacent lane Ln1 or the second adjacent lane Ln2 are referred to as "adjacent vehicles”.
- FIG. 4 is a diagram showing a situation in which the first adjacent vehicle OV1 is traveling in the first adjacent lane Ln1 and the host vehicle VA overtakes the first adjacent vehicle OV1.
- the first situation such a situation will be referred to as the "first situation”.
- the driving assistance ECU 110 changes the elements of the LK control (hereinafter referred to as "control elements").
- the control element means various processes for executing LK control and parameters used for these processes.
- the control elements include a target trajectory TL that serves as a reference for LK control, a control gain that is used for a steering control amount for LK control, and the like.
- the control element is the target trajectory TL.
- the driving support ECU 110 calculates a line Lofs that separates from the first adjacent lane Ln1 in the first situation. Therefore, the driving assistance ECU 110 obtains a correction value dc for the lateral position of the host vehicle VA with respect to the center line Lc.
- the lateral position of the own vehicle VA means the position in the road width direction within the own lane Ln0.
- the line Lofs is a line offset rightward from the center line Lc by the correction value dc.
- FIG. 5 is a map MP1 for obtaining the correction value dc.
- the map MP1 defines the relationship between the distance Dx in the longitudinal direction of the vehicle between the own vehicle VA and the first adjacent vehicle OV1 and the correction value dc. If the distance Dx is a negative value, this means that the host vehicle VA is behind the first adjacent vehicle OV1. If the distance Dx is zero, this means that the host vehicle VA is right beside the first adjacent vehicle OV1. If the distance Dx is a positive value, this means that the own vehicle VA is ahead of the first adjacent vehicle OV1. If the correction value dc is a positive value, this means that the lateral position of the host vehicle VA is offset to the left with respect to the center line Lc.
- the map MP1 is a map that offsets the lateral position of the host vehicle VA to the right with respect to the center line Lc.
- the driving support ECU 110 obtains the correction value dc according to the map MP1.
- the correction value dc is a predetermined negative value dc1 (for example, ⁇ 0.4 m )become. That is, the host vehicle VA leaves the first adjacent lane Ln1. After that, own vehicle VA overtakes first adjacent vehicle OV1. Along with this, the correction value dc gradually approaches zero and finally becomes zero. That is, the lateral position of the own vehicle VA returns to the center line Lc.
- the value dc1 may be changed as appropriate so that the host vehicle VA does not deviate from the host lane Ln0.
- the driving support ECU 110 sets the line Lofs as the target trajectory TL.
- the travel assistance ECU 110 calculates a steering control amount for causing the vehicle VA to travel along the target trajectory TL.
- the driving assistance ECU 110 outputs the steering control amount to the steering ECU 120 .
- the driving support ECU 110 executes the first control, so that the host vehicle VA can keep a larger distance from the first adjacent vehicle OV1. Pass the right side of the first adjacent vehicle OV1. It is possible to reduce the possibility that the driver feels uneasy.
- the driving assistance ECU 110 uses the map MP1 to gradually change the correction value dc according to the distance Dx. According to this configuration, the lateral position of the vehicle VA can be smoothly changed according to the distance Dx.
- first control the steering control executed in the first situation (that is, the steering control using the line Lofs as the target trajectory TL) will be referred to as "first control”.
- the driving support ECU 110 determines the first start condition based on the vehicle surrounding information.
- the first start condition is a condition for determining whether the current situation is the first situation. Specifically, the first start condition is met when both the following condition A1 and condition A2 are met. Note that the condition A2 may be changed to a condition relating to the inter-vehicle time between the host vehicle VA and the first adjacent vehicle OV1.
- Condition A1 Velocity Va of host vehicle VA > Velocity V1 of first adjacent vehicle OV1
- Condition A2 Distance Dx ⁇ First distance threshold Dxth1 (predetermined negative value)
- the driving assistance ECU 110 determines a first termination condition based on the vehicle surrounding information in order to terminate the first control.
- the first end condition is a condition for determining whether the host vehicle VA has completed overtaking the first adjacent vehicle OV1. Specifically, the first end condition is satisfied when the following condition B1 is satisfied. Note that the condition B1 may be changed to a condition relating to the inter-vehicle time between the own vehicle VA and the first adjacent vehicle OV1. (Condition B1): Distance Dx ⁇ second distance threshold Dxth2 (predetermined positive value)
- FIG. 6 is a diagram showing a situation where the first adjacent vehicle OV1 is traveling in the first adjacent lane Ln1 and the own vehicle VA is overtaken by the first adjacent vehicle OV1.
- a situation where the first adjacent vehicle OV1 is traveling in the first adjacent lane Ln1 and the own vehicle VA is overtaken by the first adjacent vehicle OV1.
- a situation will be referred to as a "second situation”.
- the first adjacent vehicle OV1 gradually approaches the own vehicle VA.
- the driving assistance ECU 110 executes the first control in such a second situation.
- the driver feels that the own vehicle VA has suddenly moved to the right, and the driver feels uneasy.
- the driving assistance ECU 110 performs steering control using the center line Lc as the target trajectory TL in the second situation.
- the driving assistance ECU 110 sets the center line Lc as the target trajectory TL.
- the travel assistance ECU 110 calculates a steering control amount for causing the vehicle VA to travel along the target trajectory TL.
- the driving assistance ECU 110 outputs the steering control amount to the steering ECU 120 . According to this configuration, even if the second situation occurs while the LK control is being executed, the driving support ECU 110 executes the second control, so the own vehicle VA does not move in the lateral direction. It is possible to reduce the possibility that the driver feels uneasy.
- second control the steering control executed in the second situation (that is, the steering control using the center line Lc as the target trajectory TL) will be referred to as "second control".
- the driving support ECU 110 determines the second start condition based on the vehicle peripheral information in order to start the second control.
- the second start condition is a condition for determining whether the current situation is the second situation. Specifically, the second start condition is met when both the following condition C1 and condition C2 are met.
- the condition C2 may be changed to a condition relating to the inter-vehicle time between the host vehicle VA and the first adjacent vehicle OV1.
- Condition C1 Velocity Va of host vehicle VA ⁇ Velocity V1 of first adjacent vehicle OV1
- Condition C2 distance Dx ⁇ third distance threshold Dxth3 (predetermined positive value)
- the driving assistance ECU 110 determines a second termination condition based on the vehicle surrounding information in order to terminate the second control.
- the second end condition is a condition for determining whether or not the first adjacent vehicle OV1 has passed the own vehicle VA. Specifically, the second end condition is satisfied when the following condition D1 is satisfied. Note that the condition D1 may be changed to a condition relating to the inter-vehicle time between the host vehicle VA and the first adjacent vehicle OV1. (Condition D1): Distance Dx ⁇ Fourth distance threshold Dxth4 (predetermined negative value)
- the driving assistance ECU 110 performs steering control using the center line Lc as the target trajectory TL. Specifically, the driving assistance ECU 110 sets the center line Lc as the target trajectory TL. The travel assistance ECU 110 calculates a steering control amount for causing the vehicle VA to travel along the target trajectory TL. The driving assistance ECU 110 outputs the steering control amount to the steering ECU 120 .
- normal control Steering control executed under normal conditions (that is, control using the center line Lc as the target trajectory TL) is called "normal control".
- FIGS. 7 and 8 are flowcharts showing routines executed by the driving support ECU 110 according to the first embodiment.
- the driving assistance ECU 110 repeatedly executes the routines of FIGS. 7 and 8 at a predetermined period dT (eg, 50 ms).
- dT eg, 50 ms
- the driving support ECU 110 reads vehicle peripheral information (step 701).
- the driving support ECU 110 detects adjacent vehicles based on the vehicle surrounding information (step 702). Note that the current situation is a normal situation, so the driving assistance ECU 110 does not detect an adjacent vehicle.
- the driving support ECU 110 determines whether the first flag Flg1 is "1" (step 703). If the first flag Flg1 is "1", this means that the current situation is the first situation. If the first flag Flg1 is "0", this means that the current situation is not the first situation. Assuming that the first flag Flg1 is "0", the driving support ECU 110 makes a "No" determination and proceeds to step 704.
- the driving support ECU 110 determines whether the second flag Flg2 is "1" (step 704). If the second flag Flg2 is "1", this means that the current situation is the second situation. If the second flag Flg2 is "0", this means that the current situation is not the second situation. Assuming that the second flag Flg2 is "0", the driving support ECU 110 makes a "No" determination and proceeds to step 705.
- the driving support ECU 110 determines whether or not there is an adjacent vehicle behind the host vehicle VA (step 705). Under normal conditions, the driving assistance ECU 110 determines "No” and proceeds to step 711 (proceeds from B in FIG. 7 to B in FIG. 8). The driving support ECU 110 determines whether or not there is an adjacent vehicle ahead of the own vehicle VA (step 711). The driving support ECU 110 determines “No” and proceeds to step 717 . The driving assistance ECU 110 performs normal control as described above. The driving support ECU 110 sets the center line Lc as the target locus TL (step 717). Next, the driving assistance ECU 110 executes smoothing processing on the target trajectory TL (step 718).
- the smoothing process is a process of making the target trajectory TL into a smooth curve so that no step occurs in the target trajectory TL.
- the driving support ECU 110 executes steering control (step 719). Specifically, the driving assistance ECU 110 calculates a steering control amount for causing the vehicle VA to travel along the target trajectory TL.
- the driving assistance ECU 110 outputs the steering control amount to the steering ECU 120 .
- the steering ECU 120 controls the steering actuator 130 based on the steering control amount.
- First Situation Assume that the current situation is the situation shown in FIG. 4 and that the host vehicle VA is about to overtake the first adjacent vehicle OV1. In this case, the driving assistance ECU 110 executes steps 701 , 702 , 703 and 704 and then proceeds to step 705 .
- the driving support ECU 110 may treat an adjacent vehicle that satisfies the following condition E1 or condition E2 as a target vehicle for the process described below.
- Condition E1 The distance in the road width direction between the own vehicle VA and the adjacent vehicle is equal to or less than a predetermined distance.
- Condition E2 The distance in the road width direction between the lane marking that defines own lane Ln0 and the adjacent vehicle is equal to or less than a predetermined distance. This is for the following reasons. For example, if the distance in the road width direction between the own vehicle VA and the adjacent vehicle is relatively large, the driver of the own vehicle VA may feel uneasy even if the own vehicle VA passes by the adjacent vehicle. because it is low.
- the driving support ECU 110 determines "No” in step 705, and proceeds to step 711 (proceeds from B in FIG. 7 to B in FIG. 8).
- the driving support ECU 110 determines whether or not there is an adjacent vehicle ahead of the own vehicle VA (step 711).
- the driving support ECU 110 determines “Yes” and proceeds to step 712 .
- the driving support ECU 110 determines whether or not the first start condition is satisfied (step 712). If the first start condition is not satisfied, the driving assistance ECU 110 determines "No" and proceeds to step 717 (proceeds from D to D in FIG. 8). The driving assistance ECU 110 performs normal control as described above.
- the driving support ECU 110 determines “Yes” and proceeds to step 713 .
- the driving assistance ECU 110 sets the first flag Flg1 to "1" (step 713).
- the driving assistance ECU 110 executes the first control.
- the driving assistance ECU 110 calculates the line Lofs using the map MP1 as described above.
- the driving support ECU 110 sets the line Lofs as the target locus TL (step 714).
- the driving assistance ECU 110 executes smoothing processing on the target trajectory TL (step 718).
- the driving support ECU 110 executes steering control (step 719).
- the driving support ECU 110 executes steps 701 and 702, and then proceeds to step 703.
- the driving support ECU 110 determines "Yes” and proceeds to step 715 (proceeds from A in FIG. 7 to A in FIG. 8).
- the driving support ECU 110 determines whether or not the first termination condition is satisfied (step 715). If the first termination condition is not satisfied, the driving assistance ECU 110 continues the first control. That is, the driving assistance ECU 110 determines “No” and executes steps 714 , 718 and 719 .
- the driving support ECU 110 determines "Yes” and proceeds to step 716 .
- the driving assistance ECU 110 sets the first flag Flg1 to "0" (step 716).
- Driving assistance ECU 110 terminates the first control and executes normal control.
- the driving support ECU 110 sets the center line Lc as the target locus TL (step 717).
- the driving assistance ECU 110 executes smoothing processing on the target trajectory TL (step 718).
- the driving support ECU 110 executes steering control (step 719).
- the driving assistance ECU 110 executes steps 701 , 702 , 703 and 704 and then proceeds to step 705 .
- the driving support ECU 110 determines “Yes” and proceeds to step 706 .
- the driving support ECU 110 determines whether or not the second start condition is satisfied (step 706). If the second start condition is not satisfied, the driving assistance ECU 110 determines "No" and proceeds to step 717 (from D in FIG. 7 to D in FIG. 8). The driving assistance ECU 110 performs normal control as described above.
- the driving assistance ECU 110 determines “Yes” and proceeds to step 707 .
- the driving assistance ECU 110 sets the second flag Flg2 to "1" (step 707).
- the driving assistance ECU 110 executes the second control.
- the driving assistance ECU 110 proceeds to step 710 (proceeds from C in FIG. 7 to C in FIG. 8).
- the driving support ECU 110 sets the center line Lc as the target locus TL (step 710).
- the driving support ECU 110 executes smoothing processing on the target trajectory TL (step 718). Then, the driving support ECU 110 executes steering control (step 719).
- the driving support ECU 110 executes steps 701, 702 and 703, and then proceeds to step 704.
- the driving support ECU 110 determines “Yes” and proceeds to step 708 .
- the driving support ECU 110 determines whether or not the second termination condition is satisfied (step 708). If the second termination condition is not satisfied, the driving assistance ECU 110 continues the second control. That is, the driving support ECU 110 makes a "No" determination and proceeds to step 710 (proceeds from C in FIG. 7 to C in FIG. 8).
- the driving support ECU 110 determines "Yes” and proceeds to step 709 .
- the driving assistance ECU 110 sets the second flag Flg2 to "0" (step 709). Therefore, the driving assistance ECU 110 terminates the second control and executes the normal control.
- the driving support ECU 110 proceeds to step 717 (proceeds from D in FIG. 7 to D in FIG. 8).
- the driving support ECU 110 sets the center line Lc as the target locus TL (step 717).
- the driving assistance ECU 110 executes smoothing processing on the target trajectory TL (step 718).
- the driving support ECU 110 executes steering control (step 719).
- the driving support ECU 110 executes determination processing to determine whether the current situation is the first situation or the second situation based on the vehicle surrounding information, and based on the result of the determination process, Steering control is executed to cause the host vehicle VA to travel along the target trajectory TL.
- the driving assistance ECU 110 controls the lateral position of the host vehicle VA by setting (or changing) the target trajectory TL according to the determined situation (first situation or second situation). As a result, the driver's sense of security can be improved.
- the driving assistance ECU 110 may set the control gain of the steering control used in the second situation larger than the control gain used in situations other than the second situation.
- the driving assistance ECU 110 applies a large torque to the steering mechanism to return the lateral position of the vehicle VA to the target trajectory TL. Therefore, the driver feels a heavy load on the operation of the steering wheel. Therefore, the lateral position of the own vehicle VA is easily maintained on the target locus TL (center line Lc). It is possible to prevent the host vehicle VA from approaching the first adjacent vehicle OV1 traveling from behind the host vehicle VA.
- Example 2 The configuration of the second embodiment will be described with reference to FIGS. 9 to 11.
- FIG. In the first situation the second adjacent vehicle OV2 may be traveling in the second adjacent lane Ln2.
- the driving assistance ECU 110 changes the correction value dc according to cases a to d described below.
- the own vehicle VA is about to overtake the first adjacent vehicle OV1. That is, the current situation is the first situation.
- the driving assistance ECU 110 obtains the correction value dc according to the map MP1 shown in FIG.
- the minimum value of the correction value dc in the map MP1 is "dc1 (eg -0.4m)”. Therefore, the driving assistance ECU 110 calculates a line Lofs that is offset to the right by "dc1" with respect to the central line Lc.
- the driving assistance ECU 110 sets the line Lofs as the target trajectory TL. In the case a, since a sufficient distance is secured between the own vehicle VA and the first adjacent vehicle OV1, the driver's sense of security can be improved.
- the own vehicle VA is about to overtake the first adjacent vehicle OV1.
- a second adjacent vehicle OV2 is traveling in the second adjacent lane Ln2.
- the second adjacent vehicle OV2 is about to overtake the own vehicle VA, but the distance in the vehicle longitudinal direction between the own vehicle VA and the second adjacent vehicle OV2 is relatively large (that is, greater than the predetermined distance).
- case b the driving assistance ECU 110 obtains the correction value dc according to the map MP2 shown in FIG.
- the minimum value of the correction value dc in the map MP2 is "dc2 (eg -0.2m)".
- the driving assistance ECU 110 calculates a line Lofs that is offset to the right by "dc2" with respect to the central line Lc.
- the driving assistance ECU 110 sets the line Lofs as the target trajectory TL.
- the correction value dc is smaller than in the case a considering the second adjacent vehicle OV2 approaching the own vehicle VA from behind. Therefore, the driver's sense of security can be improved.
- the own vehicle VA is about to overtake the first adjacent vehicle OV1
- the second adjacent vehicle OV2 is about to overtake the own vehicle VA.
- the distance in the vehicle longitudinal direction between the own vehicle VA and the second adjacent vehicle OV2 is smaller than in the example of FIG.
- case c the driving assistance ECU 110 obtains the correction value dc according to the map MP3 shown in FIG.
- the minimum value of the correction value dc in the map MP3 is "dc3 (eg -0.1 m)".
- the driving assistance ECU 110 calculates a line Lofs that is offset to the right by "dc3" with respect to the central line Lc.
- the driving assistance ECU 110 sets the line Lofs as the target trajectory TL.
- the correction value dc is smaller than in case b. Therefore, the driver's sense of security can be improved.
- the own vehicle VA is about to overtake the first adjacent vehicle OV1
- the second adjacent vehicle OV2 is about to overtake the own vehicle VA.
- the distance in the vehicle longitudinal direction between the own vehicle VA and the second adjacent vehicle OV2 is zero. That is, the second adjacent vehicle OV2 is about to pass by the own vehicle VA.
- case d the driving assistance ECU 110 obtains the correction value dc according to the map MP4 shown in FIG.
- the minimum value of the correction value dc in the map MP4 is "dc4 (eg -0.05m)".
- the driving assistance ECU 110 calculates a line Lofs that is offset to the right by "dc4" with respect to the central line Lc.
- the driving assistance ECU 110 sets the line Lofs as the target trajectory TL.
- the correction value dc is smaller than in case c. Therefore, the driver's sense of security can be improved.
- dc4 may be zero for case d.
- the driving assistance ECU 110 sets the center line Lc as the target trajectory TL. Since the lateral position of the own vehicle VA is maintained on the center line Lc, the driver's sense of security can be further improved.
- FIG. 14 is a flow chart showing a routine executed by the driving assistance ECU 110 according to the second embodiment.
- the driving assistance ECU 110 executes the routine of FIG. 14 instead of the routine of FIG.
- the routine in FIG. 14 differs from the routine in FIG. 8 in that steps 1401 to 1405 are added. Note that steps that are the same as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.
- the driving support ECU 110 determines "Yes” in step 712 and sets the first flag Flg1 to "1" (step 713). Next, the driving support ECU 110 determines which of cases a to d the current situation corresponds to, based on the vehicle peripheral information (step 1401).
- the driving assistance ECU 110 selects the map MP1 (step 1402). In case b, the driving assistance ECU 110 selects the map MP2 (step 1403). In case c, the driving assistance ECU 110 selects the map MP3 (step 1404). In case d, the driving assistance ECU 110 selects the map MP4 (step 1405).
- the driving support ECU 110 calculates the line Lofs using the selected map, and sets the line Lofs as the target trajectory TL (step 714).
- the processing after this step is the same as in FIG.
- the driving support ECU 110 determines whether or not the second adjacent vehicle OV2 exists in the second adjacent lane Ln2, and changes the correction value dc when the second adjacent vehicle OV2 exists. Specifically, the magnitude (absolute value) of the correction value dc decreases as the magnitude (absolute value) of the distance in the vehicle longitudinal direction between the host vehicle VA and the second adjacent vehicle OV2 decreases. Therefore, the driver's sense of security can be improved.
- the driving support ECU 110 may be configured to proceed to step 1401 when the determination in step 715 is “No”. In this case, the driving assistance ECU 110 can appropriately select any one of the maps MP1 to MP4 according to changes in the relationship between the own vehicle VA and the second adjacent vehicle OV2.
- the driving assistance ECU 110 sets the control gain of the steering control when the second adjacent vehicle OV2 exists in the second adjacent lane Ln2 (for example, case b, case c, or case d) to the second adjacent lane Ln2. may be set larger than when the second adjacent vehicle OV2 does not exist (case a).
- the driving assistance ECU 110 applies a large torque to the steering mechanism to return the lateral position of the vehicle VA to the target trajectory TL. Therefore, the driver feels a heavy load on the operation of the steering wheel. Therefore, the lateral position of the own vehicle VA is easily maintained on the target trajectory TL. It is possible to prevent the host vehicle VA from approaching the second adjacent vehicle OV2.
- FIG. 15 is a map MP5 for obtaining the correction factor Rc by which the correction value dc1 is multiplied.
- the map MP5 defines the relationship between the inter-vehicle time Tin between the own vehicle VA and the first adjacent vehicle OV1 and the correction factor Rc.
- the driving assistance ECU 110 can calculate the inter-vehicle time Tin based on the relative speed and the distance Dx of the first adjacent vehicle OV1 with respect to the host vehicle VA. If the inter-vehicle time Tin is 5 s, this means that the host vehicle VA is present at a relatively distant position behind the first adjacent vehicle OV1. Therefore, the correction rate Rc is 0%. In this case, the driving assistance ECU 110 drives along the center line Lc. As the headway time Tin decreases, the correction factor Rc increases. That is, the closer the host vehicle VA is to the first adjacent vehicle OV1, the larger the magnitude (absolute value) of the final correction value dc.
- the driving assistance ECU 110 in the third embodiment executes the routines of FIGS. 7 and 8. FIG. However, the processing of step 714 is different from that of the first embodiment.
- the driving support ECU 110 obtains the correction factor Rc using the map MP5.
- the driving assistance ECU 110 obtains the final correction value dc by multiplying the correction value dc1 by the correction factor Rc.
- the driving support ECU 110 calculates the line Lofs using the correction value dc, and sets the line Lofs as the target trajectory TL.
- the driving support ECU 110 can offset the lateral position of the host vehicle VA to the right side with respect to the center line Lc according to the inter-vehicle time Tin.
- the host vehicle VA passes on the right side of the first adjacent vehicle OV1 with a larger gap with respect to the first adjacent vehicle OV1. It is possible to reduce the possibility that the driver feels uneasy.
- the driving assistance ECU 110 uses the map MP5 to gradually change the correction value dc according to the time headway Tin. According to this configuration, the lateral position of the vehicle VA can be smoothly changed according to the inter-vehicle time Tin.
- driving assistance ECU 110 executes the first control.
- the driving assistance ECU 110 executes the second control.
- FIG. 16 is a flow chart showing a routine executed by the driving assistance ECU 110 according to the fourth embodiment.
- the driving assistance ECU 110 executes the routine of FIG. 16 instead of the routine of FIG.
- the routine in FIG. 16 differs from the routine in FIG. 8 in that steps 1601 and 1602 are added. Steps that are the same as those in FIG. 8 are assigned the same reference numerals, and descriptions thereof are omitted.
- the driving support ECU 110 proceeds to step 1601 via step 707.
- the driving support ECU 110 determines whether the relative speed Vrs is equal to or greater than a predetermined speed threshold Vrth (step 1601). If the relative speed Vrs is equal to or greater than the predetermined speed threshold value Vrth, the driving support ECU 110 determines “Yes” and proceeds to step 1602 .
- the driving support ECU 110 calculates the line Lofs using the correction value dc, and sets the line Lofs as the target trajectory TL (step 1602).
- the correction value dc may be "dc1 (eg -0.4m)".
- the correction value dc may be obtained so as to change according to the distance Dx or the time headway Tin, as described above.
- the processing after this step (steps 718 and 719) is the same as in FIG.
- the driving support ECU 110 determines "No" and executes steps 710, 718 and 719.
- the driving assistance ECU 110 executes the first control to set the target locus TL away from the first adjacent lane Ln1.
- the distance between own vehicle VA and first adjacent vehicle OV1 increases.
- the first adjacent vehicle OV1 passes the side of the own vehicle VA, it is possible to reduce the possibility of the own vehicle VA swaying in the lateral direction due to the wind pressure generated by the passage of the first adjacent vehicle OV1. Therefore, it is possible to reduce the possibility that the driver of the own vehicle VA feels uneasy.
- Example 5 The configuration of Example 5 will be described with reference to FIG.
- the host vehicle VA overtakes the first adjacent vehicle OV1
- the lateral position of the vehicle VA moves again onto the line Lofs. Since the own vehicle VA wobbles in the lateral direction, the driver of the own vehicle VA may feel uneasy.
- the driving assistance ECU 110 continues the first control. The lateral position of the own vehicle VA is maintained on the line Lofs. It is possible to prevent the vehicle VA from swaying in the lateral direction.
- the driving assistance ECU 110 executes the routines shown in FIGS. 7 and 8. FIG. However, the processing of step 715 is different from that of the first embodiment.
- the driving support ECU 110 determines whether the following first termination condition is satisfied.
- the first end condition of this example is satisfied when both condition B1 and condition B2 are satisfied.
- Condition B1 Distance Dx ⁇ second distance threshold Dxth2 (predetermined positive value)
- Condition B2 There is no other adjacent vehicle within a predetermined distance range in front of the first adjacent vehicle OV1.
- the driving assistance ECU 110 continues the first control when the adjacent vehicle OV3 exists further ahead of the first adjacent vehicle OV1. It is possible to prevent the vehicle VA from swaying in the lateral direction. It is possible to reduce the possibility that the driver of the own vehicle VA feels uneasy.
- FIG. 18 is a flow chart showing a routine executed by the driving assistance ECU 110 according to the sixth embodiment.
- the driving assistance ECU 110 executes the routine of FIG. 18 instead of the routine of FIG.
- the routine in FIG. 18 differs from the routine in FIG. 8 in that steps 1801 and 1802 are added. Note that steps that are the same as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.
- step 712 the driving assistance ECU 110 executes step 713 and proceeds to step 1801.
- the driving support ECU 110 determines whether the time Tov is equal to or less than the time threshold Toth (step 1801). If the time Tov is less than or equal to the time threshold Toth, the driving assistance ECU 110 determines “Yes” and proceeds to step 1802 .
- the driving assistance ECU 110 corrects the target trajectory TL so that the current lateral position of the vehicle VA is maintained.
- the processing after this step (steps 718 and 719) is the same as in FIG.
- step 714 the processing after this step (steps 714, 718 and 719) is the same as in FIG.
- the driving support ECU 110 corrects the target trajectory TL so that the current lateral position of the vehicle VA is maintained when the time Tov is equal to or less than the time threshold Toth during execution of the first control. . Therefore, lateral movement of the own vehicle VA is suppressed. It is possible to reduce the possibility that the driver of the own vehicle VA feels uneasy.
- the driving assistance ECU 110 uses the reliability DR defined below in order to accurately determine whether the current situation is the first situation.
- the reliability DR is an index representing the probability of the degree of proximity between the host vehicle VA and the first adjacent vehicle OV1.
- the driving assistance ECU 110 calculates the reliability DR using the distance Dy. As shown in FIG. 19, the distance Dy is the distance between the first adjacent vehicle OV1 and the left lane line LL representing the boundary between the own lane Ln0 and the first adjacent lane Ln1.
- the distance Dy is calculated as a positive value.
- the driving support ECU 110 adds, subtracts, or maintains the reliability DR according to the table in FIG. 20 at a predetermined cycle dT (eg, 50 ms).
- dT eg, 50 ms
- the upper limit of reliability DR is "20" and the lower limit of reliability DR is "0".
- the driving support ECU 110 detects the first adjacent vehicle OV1
- the driving support ECU 110 starts calculating the reliability DR.
- the reliability DR is "0" at the beginning.
- the driving support ECU 110 adds "2.0" to the reliability DR.
- the driving assistance ECU 110 adds "1.0" to the reliability DR.
- Dy2 ⁇ Dy ⁇ Dy3 the driving assistance ECU 110 maintains the current reliability DR.
- Dy3 ⁇ Dy the driving assistance ECU 110 subtracts "1.0" from the reliability DR.
- the driving support ECU 110 determines the start of the first control using the reliability DR.
- the first start condition is that (i) the first adjacent vehicle OV1 exists in front of the own vehicle VA, (ii) the speed Va of the own vehicle VA is greater than the speed V1 of the first adjacent vehicle OV1, and (iii) is established when the reliability DR reaches "20".
- the driving assistance ECU 110 determines to start the second control using the reliability DR.
- the second start condition is that (i) the first adjacent vehicle OV1 exists behind the host vehicle VA, (ii) the speed V1 of the first adjacent vehicle OV1 is greater than the speed Va of the host vehicle VA, and and (iii) is established when the reliability DR reaches "20".
- the driving support ECU 110 may use the reliability DR to determine the end of the first control. In this example, the driving assistance ECU 110 gradually decreases the reliability DR after starting the first control. The first termination condition is met when the reliability DR reaches a predetermined value (for example, any value between 0 and 10). Similarly, the driving assistance ECU 110 may use the reliability DR to determine the end of the second control. In this example, the driving assistance ECU 110 gradually decreases the reliability DR after starting the second control. The second end condition is met when the reliability DR reaches a predetermined value (for example, any value between 0 and 10).
- the driving assistance ECU 110 determines the first situation or the second situation according to the change in the distance Dy. Even if the accuracy of the vehicle surroundings sensor 140 is low, it is less likely to be affected by noise or the like, and chattering of determination results can be eliminated. It is possible to improve the accuracy of determining whether the current situation is the first situation or the second situation.
- the reliability DR is not limited to the above example, and is based on the relative speed of the first adjacent vehicle OV1 with respect to the own vehicle VA and/or the distance Dx in the vehicle longitudinal direction between the own vehicle VA and the first adjacent vehicle OV1. may be calculated using
- the driving support ECU 110 may add, subtract, or maintain the reliability DR according to the table of FIG. 21 at a predetermined period dT (eg, 50 ms).
- the table of FIG. 21 is a table used to determine the first situation, and is used in situations where the distance Dx is a negative value.
- Dx1 and Dx2 are both negative values and Dx1>Dx2.
- the reliability DR increases as the own vehicle VA approaches the first adjacent vehicle OV1 from behind the first adjacent vehicle OV1.
- the host vehicle VA decelerates in a situation behind the first adjacent vehicle OV1, thereby causing the host vehicle VA to gradually move away from the first adjacent vehicle OV1. In this case, the reliability DR becomes small.
- the upper limit of reliability DR is "20" and the lower limit of reliability DR is "0".
- the driving assistance ECU 110 determines the start of the first control using the reliability DR. The first start condition is satisfied when the reliability DR reaches "20". Furthermore, the driving assistance ECU 110 determines the end of the first control using the reliability DR. The driving assistance ECU 110 gradually decreases the reliability DR after starting the first control. The first termination condition is met when the reliability DR reaches a predetermined value (for example, any value between 0 and 10). According to this configuration, the driving assistance ECU 110 is configured to determine the first situation according to the change in the distance Dx. Even if the accuracy of the vehicle surroundings sensor 140 is low, the accuracy of determination of the first situation can be improved. Note that the driving assistance ECU 110 may determine the second situation using a similar method.
- the driving assistance ECU 110 may set a first area A1 in front of the host vehicle VA and within the first adjacent lane Ln1.
- the first area A1 is an area for determining whether or not there is a first adjacent vehicle OV1 that the host vehicle VA will overtake.
- the driving assistance ECU 110 may start the first control when the first adjacent vehicle OV1 enters the first area A1.
- the driving assistance ECU 110 may end the first control when the first adjacent vehicle OV1 leaves the first area A1.
- the driving support ECU 110 may change the length Lx1 of the first area A1 in the longitudinal direction according to the speed Va of the own vehicle VA. For example, the greater the velocity Va, the greater the length Lx1 may be set.
- the driving support ECU 110 may change the length Lx1 of the first area A1 in the front-rear direction according to the running curvature of the vehicle VA.
- the driving assistance ECU 110 may set the second area A2 within the second adjacent lane Ln2.
- a second area A2 is used to determine case d. That is, when the first adjacent vehicle OV1 exists within the first area A1 and the second adjacent vehicle OV2 exists within the second area A2, the driving assistance ECU 110 executes the process for case d.
- the driving assistance ECU 110 obtains the correction value dc according to the map MP4 shown in FIG.
- the driving assistance ECU 110 calculates a line Lofs that is offset to the right by "dc4" with respect to the central line Lc.
- the driving assistance ECU 110 sets the line Lofs as the target trajectory TL.
- the second area A2 extends from a position in front of the own vehicle VA to a position behind the own vehicle VA.
- the length Lx2 in the front-rear direction of the second area A2 is smaller than the length Lx1 in the front-rear direction of the first area A1, so the second area A2 is smaller than the first area A1.
- the front end A2_f of the second area A2 is closer to the vehicle VA than the front end A1_f of the first area A1.
- the driving support ECU 110 may change the length Lx2 of the second area A2 in the front-rear direction according to the speed Va of the own vehicle VA.
- the driving support ECU 110 may change the length Lx2 of the second area A2 in the front-rear direction according to the driving curvature of the vehicle VA.
- SYMBOLS 110 Driving assistance ECU, 120... Steering ECU, 130... Steering actuator, 140... Vehicle periphery sensor, 150... Vehicle speed sensor
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Abstract
Description
(走行支援装置の構成)
図1は、走行支援装置の構成を示した図である。走行支援装置は、車両(自車両)VAに搭載される。走行支援装置は、走行支援ECU110と、操舵ECU120と、操舵アクチュエータ130と、車両周辺センサ140と、車速センサ150とを備える。
図3は、操舵制御の一例であるLK制御を説明するための図である。走行支援ECU110は、車両周辺情報(区画線情報)に基づいて、左区画線LL及び右区画線RLを検出する。走行支援ECU110は、左区画線LLと右区画線RLとの間の領域を、車両VAが走行すべき領域(即ち、車線)として認識する。走行支援ECU110は、左区画線LLと右区画線RLとの間の道路幅方向の中心位置を結んだラインを、中央ラインLcとして設定する。そして、走行支援ECU110は、中央ラインLcをLK制御の目標軌跡TLとして設定する。走行支援ECU110は、車両VAを目標軌跡TLに沿って走行させるための操舵制御量(例えば、操舵トルク)を演算する。走行支援ECU110は、操舵制御量を操舵ECU120に出力する。操舵ECU120は、操舵制御量に基づいて、操舵アクチュエータ130を制御する。
図4は、第1隣接車両OV1が第1隣接車線Ln1を走行しており、且つ、自車両VAが第1隣接車両OV1を追い越す状況を示した図である。以降において、このような状況は「第1状況」と称呼される。
(条件A1):自車両VAの速度Va > 第1隣接車両OV1の速度V1
(条件A2):距離Dx ≧ 第1距離閾値Dxth1(所定の負の値)
(条件B1):距離Dx ≧ 第2距離閾値Dxth2(所定の正の値)
図6は、第1隣接車両OV1が第1隣接車線Ln1を走行しており、且つ、自車両VAが第1隣接車両OV1に追い越される状況を示した図である。以降において、このような状況は「第2状況」と称呼される。
(条件C1):自車両VAの速度Va < 第1隣接車両OV1の速度V1
(条件C2):距離Dx ≦ 第3距離閾値Dxth3(所定の正の値)
(条件D1):距離Dx ≦ 第4距離閾値Dxth4(所定の負の値)
以降において、第1状況でも第2状況でもない状況は、「通常状況」と称呼される。通常状況において、走行支援ECU110は、中央ラインLcを目標軌跡TLとして用いた操舵制御を実行する。具体的には、走行支援ECU110は、中央ラインLcを目標軌跡TLとして設定する。走行支援ECU110は、車両VAを目標軌跡TLに沿って走行させるための操舵制御量を演算する。走行支援ECU110は、操舵制御量を操舵ECU120に出力する。
図7及び図8は、実施例1における走行支援ECU110が実行するルーチンを示したフローチャートである。走行支援ECU110は、所定の周期dT(例えば、50ms)で図7及び図8のルーチンを繰り返し実行する。以下では、「通常状況」、「第1状況」及び「第2状況」のそれぞれについて処理の流れを説明する。
走行支援ECU110は、車両周辺情報を読み込む(ステップ701)。走行支援ECU110は、車両周辺情報に基づいて、隣接車両を検出する(ステップ702)。なお、現在の状況は通常状況であるので、走行支援ECU110は、隣接車両を検出しない。
現在の状況が図4の状況になり、自車両VAが第1隣接車両OV1を追い越そうとしていると仮定する。この場合、走行支援ECU110は、ステップ701、ステップ702、ステップ703及びステップ704を実行し、その後、ステップ705に進む。
(条件E1):自車両VAと隣接車両との間の道路幅方向の距離が、所定の距離以下である。
(条件E2):自車線Ln0を規定する区画線と隣接車両との道路幅方向の距離が、所定の距離以下である。
これは、以下の理由による。例えば、自車両VAと隣接車両との間の道路幅方向の距離が比較的大きい場合、自車両VAが隣接車両の横を通過しても、自車両VAの運転者が不安に感じる可能性が低いためである。
現在の状況が図6の状況になり、第1隣接車両OV1が自車両VAを追い越そうとしていると仮定する。この場合、走行支援ECU110は、ステップ701、ステップ702、ステップ703、ステップ704を実行し、その後、ステップ705に進む。走行支援ECU110は、「Yes」と判定してステップ706に進む。
上記の構成によれば、走行支援ECU110は、車両周辺情報に基づいて、現在の状況が第1状況又は第2状況であるかを判定する判定処理を実行し、判定処理の結果に基づいて、自車両VAを目標軌跡TLに沿って走行させる操舵制御を実行する。走行支援ECU110は、判定された状況(第1状況又は第2状況)に応じて目標軌跡TLを設定(又は変更)することにより、自車両VAの横位置を制御する。これにより、運転者の安心感を向上させることができる。
走行支援ECU110は、第2状況において使用される操舵制御の制御ゲインを、第2状況以外の状況において使用される制御ゲインに比べて大きく設定してもよい。この構成において、第2状況において自車両VAの運転者がハンドルを操作すると、走行支援ECU110は、自車両VAの横位置を目標軌跡TLに戻すための大きなトルクをステアリング機構に付与する。従って、運転者がハンドルの操作に対して大きな負荷を感じる。従って、自車両VAの横位置が目標軌跡TL(中央ラインLc)に維持され易くなる。自車両VAが、自車両VAの後方から走行してくる第1隣接車両OV1に接近するのを防ぐことができる。
図9~図11を用いて、実施例2の構成を説明する。第1状況において、第2隣接車両OV2が第2隣接車線Ln2を走行している場合がある。走行支援ECU110は、以下で説明するケースa~ケースdに応じて、補正値dcを変更する。
図14は、実施例2における走行支援ECU110が実行するルーチンを示したフローチャートである。走行支援ECU110は、図8のルーチンに代えて、図14のルーチンを実行する。図14のルーチンは、ステップ1401~ステップ1405が追加されている点において、図8のルーチンと異なる。なお、図8と同じステップについては、同一の符号を付してその説明を省略する。
上記構成によれば、走行支援ECU110は、第2隣接車線Ln2に第2隣接車両OV2が存在するかを判定し、第2隣接車両OV2が存在する場合、補正値dcを変更する。具体的には、自車両VAと第2隣接車両OV2との間の車両前後方向における距離の大きさ(絶対値)が小さくなるほど、補正値dcの大きさ(絶対値)が小さくなる。従って、運転者の安心感を向上させることができる。
なお、走行支援ECU110は、ステップ715において「No」と判定した場合、ステップ1401に進むように構成されてもよい。この場合、走行支援ECU110は、自車両VAと第2隣接車両OV2との間の関係の変化に応じて、マップMP1~MP4の何れかを適宜選択することができる。
図15を用いて、実施例3の構成を説明する。図15は、補正値dc1に対して乗算する補正率Rcを求めるためのマップMP5である。第1状況において、走行支援ECU110は、補正値dc1(例えば、-0.4m)に対して補正率Rcを乗算することにより、自車両VAの横位置の最終的な補正値dcを求める(dc=dc1×Rc)。
実施例3における走行支援ECU110は、図7及び図8のルーチンを実行する。但し、ステップ714の処理が実施例1と異なる。走行支援ECU110は、ステップ714において、マップMP5を用いて補正率Rcを求める。走行支援ECU110は、補正値dc1に対して補正率Rcを乗算することにより、最終的な補正値dcを求める。走行支援ECU110は、補正値dcを用いてラインLofsを演算し、ラインLofsを目標軌跡TLとして設定する。
上記構成によれば、走行支援ECU110は、車間時間Tinに応じて、自車両VAの横位置を中央ラインLcに対して右側へオフセットさせることができる。自車両VAが、第1隣接車両OV1に対してより大きく間隔を空けて第1隣接車両OV1の右側を通過する。運転者が不安に感じる可能性を低減することができる。更に、走行支援ECU110は、マップMP5を用いて、車間時間Tinに従って補正値dcを徐々に変更する。この構成によれば、車両VAの横位置を車間時間Tinに従って滑らかに変化させることができる。
第2状況において、自車両VAに対する第1隣接車両OV1の相対速度が比較的大きいと仮定する。この場合、第1隣接車両OV1が自車両VAの横を通過する際に、第1隣接車両OV1の通過により生じる風圧により自車両VAが横方向にふらつく可能性がある。従って、自車両VAの運転者が不安に感じる可能性もある。そこで、第2状況において、走行支援ECU110は、自車両VAに対する第1隣接車両OV1の相対速度Vrsを演算する。相対速度Vrsは、第1隣接車両OV1の速度V1と自車両VAの速度Vaとの差分である(Vrs=V1-Va)。相対速度Vrsが所定の速度閾値Vrth以上である場合、走行支援ECU110は、第1制御を実行する。これに対し、相対速度Vrsが所定の速度閾値Vrth未満である場合、走行支援ECU110は、第2制御を実行する。
図16は、実施例4における走行支援ECU110が実行するルーチンを示したフローチャートである。走行支援ECU110は、図8のルーチンに代えて、図16のルーチンを実行する。図16のルーチンは、ステップ1601~ステップ1602が追加されている点において、図8のルーチンと異なる。図8と同じステップについては、同一の符号を付してその説明を省略する。
上記構成によれば、相対速度Vrsが大きい場合には、走行支援ECU110は、目標軌跡TLを第1隣接車線Ln1から離れるように設定する第1制御を実行する。自車両VAと第1隣接車両OV1との間の間隔が大きくなる。第1隣接車両OV1が自車両VAの横を通過する際に、第1隣接車両OV1の通過により生じる風圧により自車両VAが横方向にふらつく可能性を低減できる。従って、自車両VAの運転者が不安に感じる可能性を低減できる。
図17を用いて、実施例5の構成を説明する。第1状況において、自車両VAが第1隣接車両OV1を追い越した時点にて、第1隣接車両OV1の前方に更に隣接車両OV3が存在する場合がある。この場合、自車両VAの横位置が一旦中央ラインLcに戻った後に、自車両VAの横位置が再度ラインLofs上に移動する。自車両VAが横方向にふらつくので、自車両VAの運転者が不安に感じる可能性がある。これを考慮して、自車両VAが第1隣接車両OV1を追い越した時点にて第1隣接車両OV1の前方に更に隣接車両OV3が存在する場合、走行支援ECU110は、第1制御を継続する。自車両VAの横位置がラインLofs上に維持される。自車両VAが横方向にふらつくのを防ぐことができる。
実施例5における走行支援ECU110は、図7及び図8のルーチンを実行する。但し、ステップ715の処理が実施例1と異なる。走行支援ECU110は、ステップ715において、以下の第1終了条件が成立するかを判定する。本例の第1終了条件は、条件B1及び条件B2の両方が成立したときに成立する。
(条件B1):距離Dx ≧ 第2距離閾値Dxth2(所定の正の値)
(条件B2):第1隣接車両OV1の前方の所定の距離範囲以内に別の隣接車両が存在しない。
上記構成によれば、第1隣接車両OV1の前方に更に隣接車両OV3が存在する場合、走行支援ECU110は、第1制御を継続する。自車両VAが横方向にふらつくのを防ぐことができる。自車両VAの運転者が不安に感じる可能性を低減できる。
第1状況において、自車両VAの速度Vaが第1隣接車両OV1の速度V1よりもかなり大きい場合、自車両VAが第1隣接車両OV1を追い越すまでのかかる時間が小さい。第1制御により自車両VAが短い時間で横方向に移動すると、自車両VAの運転者が不安に感じる可能性がある。これを考慮して、第1状況において、走行支援ECU110は、自車両VAが第1隣接車両OV1を追い越すまでのかかる時間Tovを演算する。時間Tovが所定の時間閾値Toth以下である場合、走行支援ECU110は、自車両VAの現在の横位置を維持する。
図18は、実施例6における走行支援ECU110が実行するルーチンを示したフローチャートである。走行支援ECU110は、図8のルーチンに代えて、図18のルーチンを実行する。図18のルーチンは、ステップ1801~ステップ1802が追加されている点において、図8のルーチンと異なる。なお、図8と同じステップについては、同一の符号を付してその説明を省略する。
上記構成によれば、走行支援ECU110は、第1制御の実行中において時間Tovが時間閾値Toth以下である場合、自車両VAの現在の横位置が維持されるように、目標軌跡TLを補正する。従って、自車両VAの横方向の移動が抑制される。自車両VAの運転者が不安に感じる可能性を低減できる。
図19を用いて、実施例7の構成を説明する。車両周辺センサ140の精度が低い場合がある。走行支援ECU110は、現在の状況が第1状況であるかを精度良く行うために、以下に定義する信頼度DRを用いる。信頼度DRは、自車両VAと第1隣接車両OV1との接近度合の確からしさを表す指標である。走行支援ECU110は、距離Dyを用いて信頼度DRを演算する。図19に示すように、距離Dyは、第1隣接車両OV1と、自車線Ln0と第1隣接車線Ln1との境界を表す左区画線LLとの間の距離である。距離Dyは、正の値として演算される。
上記構成によれば、走行支援ECU110は、距離Dyの変化に応じて、第1状況又は第2状況を判定する。車両周辺センサ140の精度が低い場合でも、ノイズ等による影響を受けにくく、判定結果のチャタリングも無くすことができる。現在の状況が第1状況又は第2状況であるかの判定精度を向上させることができる。
信頼度DRは、上記の例に限定されず、自車両VAに対する第1隣接車両OV1の相対速度、及び/又は、自車両VAと第1隣接車両OV1との間の車両前後方向における距離Dxを用いて演算されてもよい。
図22を用いて、実施例8の構成を説明する。走行支援ECU110は、第1状況を判定するために、自車両VAの前方で且つ第1隣接車線Ln1内に、第1領域A1を設定してもよい。第1領域A1は、自車両VAが追い越すことになる第1隣接車両OV1が存在するかを判定するための領域である。走行支援ECU110は、第1領域A1内に第1隣接車両OV1が進入したときに、第1制御を開始してもよい。走行支援ECU110は、第1領域A1から第1隣接車両OV1が出たときに、第1制御を終了してもよい。
Claims (14)
- 自車両の周辺領域に関する車両周辺情報を取得する少なくとも1つのセンサと、
前記車両周辺情報に基づいて、現在の状況が第1状況又は第2状況であるかを判定する判定処理を実行し、
前記判定処理の結果に基づいて、前記自車両を目標軌跡に沿って走行させる操舵制御を実行するように構成された少なくとも1つのプロセッサと、
を備え、
前記第1状況は、前記自車両が、前記自車両が走行する自車線に隣接する第1隣接車線を走行する第1他車両を追い越す状況であり、
前記第2状況は、前記自車両が、前記第1他車両に追い越される状況である、
走行支援装置。 - 請求項1に記載の走行支援装置において、
前記プロセッサは、前記第1状況において、前記目標軌跡を前記第1隣接車線から離れるように設定する第1制御を実行するように構成された、
走行支援装置。 - 請求項2に記載の走行支援装置において、
前記プロセッサは、前記第1隣接車線において前記第1他車両の前方に第2他車両が存在する場合、前記第1制御を継続するように構成された、
走行支援装置。 - 請求項2に記載の走行支援装置において、
前記プロセッサは、前記第1制御において、中央ラインに対して補正値だけオフセットしたラインを、前記目標軌跡として設定するように構成され、
前記中央ラインは、前記自車線における道路幅方向の中心位置を結んだラインである、 走行支援装置。 - 請求項4に記載の走行支援装置において、
前記プロセッサは、前記自車両と前記第1他車両との間の車両前後方向における距離、又は、前記自車両と前記第1他車両との間の車間時間に従って、前記補正値を変更するように構成された、
走行支援装置。 - 請求項4に記載の走行支援装置において、
前記プロセッサは、
前記自車線に隣接し且つ前記第1隣接車線とは反対側に存在する第2隣接車線に第2他車両が存在するかを判定し、
前記第2他車両が存在する場合、前記補正値を変更する
ように構成された、
走行支援装置。 - 請求項6に記載の走行支援装置において、
前記プロセッサは、
前記自車両の前方で且つ前記第1隣接車線内に設定された第1領域を用いて、前記第1状況を判定し、
前記第2隣接車線内に設定された第2領域を用いて、前記第2他車両が存在するかを判定する
ように構成された、
走行支援装置。 - 請求項2に記載の走行支援装置において、
前記プロセッサは、前記第1制御において、
前記自車線に隣接し且つ前記第1隣接車線とは反対側に存在する第2隣接車線に第2他車両が存在するかを判定し、
前記第2他車両が存在する場合の前記操舵制御の制御ゲインを、前記第2他車両が存在しない場合に比べて大きく設定するように構成された、
走行支援装置。 - 請求項2に記載の走行支援装置において、
前記プロセッサは、前記第1制御の実行中において前記自車両が前記第1他車両を追い越すまでにかかる時間が所定の時間閾値以下である場合、前記自車両の現在の横位置が維持されるように前記目標軌跡を補正するように構成された、
走行支援装置。 - 請求項1に記載の走行支援装置において、
前記プロセッサは、前記第2状況において、前記目標軌跡を中央ラインに設定する第2制御を実行するように構成され、
前記中央ラインは、前記自車線における道路幅方向の中心位置を結んだラインである、 走行支援装置。 - 請求項1に記載の走行支援装置において、
前記プロセッサは、前記第2状況において前記自車両と前記第1他車両との間の相対速度が所定の速度閾値以上である場合、前記目標軌跡を前記第1隣接車線から離れるように設定する第1制御を実行するように構成された、
走行支援装置。 - 請求項1に記載の走行支援装置において、
前記プロセッサは、前記自車両と前記第1他車両との間の道路幅方向の距離又は車両前後方向の距離の変化に応じて、前記第1状況又は前記第2状況を判定するように構成された、
走行支援装置。 - 請求項1に記載の走行支援装置において、
前記プロセッサは、前記自車両の前方で且つ前記第1隣接車線内に設定された第1領域を用いて、前記第1状況を判定するように構成された、
走行支援装置。 - 請求項13に記載の走行支援装置において、
前記プロセッサは、前記自車両の速度又は走行曲率に応じて、前記第1領域の車両前後方向における長さを変更するように構成された、
走行支援装置。
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| JP2019156295A (ja) * | 2018-03-15 | 2019-09-19 | 本田技研工業株式会社 | 走行制御装置、車両および走行制御方法 |
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