JP5397329B2 - Parking assistance device - Google Patents

Description

  The present invention relates to a parking assistance device, and more particularly to a parking assistance device that displays an image behind the host vehicle.

  There has been proposed a device that supports driving of a driver when a vehicle is parked in a parking frame by displaying an image behind the host vehicle. For example, Patent Document 1 discloses an apparatus that displays a guidance trajectory that is expected when the vehicle moves backward while being fixed at the maximum steering angle. The device of Patent Document 1 displays peripheral information acquired by a sensor and the vehicle position on a display screen. The device of Patent Document 1 displays a guide locus as an integral part of the vehicle symbol on the screen, and displays it on the screen so that the position where the guide locus is within the parking space is the reverse start position. Furthermore, the apparatus of Patent Document 1 also displays a predicted trajectory whose shape changes according to the actual steering angle of the steered wheel, and also allows the steering operation to be guided by overlapping the expected trajectory and the guide trajectory. .

JP 2001-213253 A

  By the way, in general, when a vehicle is parked in a parking frame, the traveling direction of the parking lot and the front-rear direction of the parking frame often form a predetermined angle such as 90 °. Therefore, the angle between the front-rear direction of the vehicle and the front-rear direction of the parking frame is reduced by first moving the vehicle while turning. Next, the vehicle is generally parked in a parking frame by retreating while turning in the opposite direction. However, in the above technique, when the vehicle moves forward and stops, only one guide locus expected when the vehicle moves backward while being fixed at the maximum steering angle is displayed. The length of the arc of the guide track is always constant. For this reason, when the turning angle when the vehicle moves forward and temporarily stops is small, the arc of the guide track is too short, and the reverse start position that is parallel to the parking frame may not be guided. In addition, when the turning angle when the vehicle moves forward and is temporarily stopped is large, the arc of the guide track is too long, and an unnecessarily long curve may be drawn with respect to the parking frame.

  The present invention has been made in consideration of such a situation, and an object thereof is to provide a parking assistance device capable of performing more effective parking assistance.

  The present invention includes a display unit that displays an image behind the host vehicle, and the display unit follows when the host vehicle retreats from a point where the host vehicle is currently located at least when the host vehicle is moving forward or stopped. The trajectory is displayed superimposed on the image behind the host vehicle, a trajectory having a curved portion is displayed, and the length of the curved portion is determined according to the angle between the front and rear direction of the parking frame where the host vehicle is parked and the front and rear direction of the host vehicle. It is a parking assistance device that changes the size and displays it.

  According to this configuration, the display unit that displays the image behind the host vehicle automatically follows the trajectory traced when the host vehicle moves backward from the current position when the host vehicle is at least moving forward or stopped. Overlaid on the image behind the vehicle, displays a trajectory with a curved portion, and changes the length of the curved portion according to the angle between the front and rear direction of the parking frame where the host vehicle is parked and the front and rear direction of the host vehicle And display. For this reason, the driver makes the own vehicle turn backward from the point where the own vehicle is currently turned, and makes the own vehicle move backward at a steering angle 0 at a position where the directions of the own vehicle and the parking frame are parallel. It is easy to intuitively grasp the standard.

  In addition, the present invention includes a display unit that displays an image of the rear of the host vehicle, and the display unit displays an image of the rear of the host vehicle when the host vehicle moves backward from a point where the host vehicle is currently located at least when the host vehicle is moving forward. Are displayed in a superimposed manner, and a trajectory having a curved portion is displayed. The longer the angle formed by the front and rear direction of the parking frame in which the host vehicle is parked and the front and rear direction of the own vehicle, the longer the length of the curved portion is displayed. Parking assistance device.

  According to this configuration, at least when the host vehicle is moving forward, the trajectory traced when the host vehicle retreats from the current position is displayed superimposed on the image behind the host vehicle, the track having a curved portion is displayed, and the host vehicle is displayed. The longer the angle between the front-rear direction of the parking frame where the vehicle is parked and the front-rear direction of the host vehicle, the longer the curved portion is displayed. For this reason, the driver makes the own vehicle turn backward from the point where the own vehicle is currently turned, and makes the own vehicle move backward at a steering angle 0 at a position where the directions of the own vehicle and the parking frame are parallel. It is easy to intuitively grasp the standard.

  In these cases, the display unit displays a trajectory having a curved portion and a straight portion.

  According to this configuration, the display unit displays a trajectory having a curved portion and a straight portion. For this reason, the driver can park the vehicle in the parking frame by performing an operation of turning the vehicle backward while turning the vehicle and an operation of making the vehicle turn backward with the steering angle set to 0 according to the displayed trajectory. This makes it easier to park the host vehicle in the parking frame.

  Further, it is preferable that the display unit displays a trajectory in which the curved portion extends backward from the point where the host vehicle is currently located and the linear portion extends from the rear end portion of the curved portion.

  According to this configuration, the display unit displays a locus in which the curved portion extends backward from the point where the host vehicle is currently located and the linear portion extends from the rear end portion of the curved portion. For this reason, the driver can park the host vehicle in the parking frame by performing an operation of turning the host vehicle while turning it backward and an operation of moving the host vehicle backward by setting the steering angle of the host vehicle to 0. It becomes even easier to park the vehicle in the parking frame.

  In this case, the display unit extends from the point where the host vehicle is currently located to a point where the curved part and the front and rear direction of the parking frame where the host vehicle is parked are parallel, and the front and rear direction of the parking frame where the host vehicle is parked. It is preferable to display a trajectory in which the straight line portion and the straight line portion are parallel.

  According to this configuration, the display unit has a parking frame in which the curved portion extends from the point where the host vehicle is currently located to a point where the curved portion and the front and rear direction of the parking frame in which the host vehicle is parked are parallel, and the host vehicle is parked. The trajectory in which the front-rear direction and the straight line portion are parallel is displayed. For this reason, the driver can make the host vehicle parallel to the parking frame by moving the host vehicle backward by setting the steering angle to 0 at a position where the curved portion of the displayed trajectory changes to a straight line portion. It becomes even easier to park the vehicle in the parking frame.

  In addition, it is preferable that the display unit displays one type of trajectory that the host vehicle follows according to the steering angle of the host vehicle when the host vehicle moves backward.

  According to this configuration, the display unit displays one type of trajectory that the host vehicle follows according to the steering angle of the host vehicle when the host vehicle is moving backward. For this reason, the driver can easily grasp the trajectory of the host vehicle according to the steering angle of the host vehicle when the host vehicle is moving backward. In particular, when a display including a plurality of trajectories that can be traced when the host vehicle retreats from a point where the current vehicle is located at any time during forward or stop, the plurality of trajectories are displayed. It is possible to absorb the play caused by the above, and it is easy to park the vehicle in the parking frame accurately.

  Further, it is preferable that the display unit displays a locus when the host vehicle moves backward in a steering direction opposite to the steering direction when the host vehicle is moving forward.

  According to this structure, the locus | trajectory at the time of reversing | reversing in the steering direction opposite to the steering direction at the time of the own vehicle advance is displayed. This eliminates the need for the driver to select which direction the left and right directions are to be displayed for the most frequently used parking method, and makes the operation at the time of parking easier.

  According to the parking assistance apparatus of the present invention, it becomes possible to perform more effective parking assistance.

It is a block diagram which shows the structure of the parking assistance apparatus which concerns on embodiment. It is a flowchart which shows operation | movement of the parking assistance apparatus which concerns on embodiment. It is a top view which shows a series of operation | movement and a locus | trajectory when the vehicle carrying the parking assistance apparatus of embodiment parks in a parking frame. It is a top view which shows the aspect at the time of approaching the parking lot of the vehicle carrying the parking assistance apparatus of embodiment. It is the figure which showed the locus | trajectory displayed on the display of the parking assistance apparatus of embodiment virtually on the plane. It is the figure which showed virtually the image of the parking frame displayed on the display of the parking assistance device of an embodiment on a plane. It is the figure which showed the image and locus | trajectory of the parking frame displayed on the display of the parking assistance apparatus of embodiment on a plane virtually. It is the figure which showed virtually the picture and locus of the parking frame which are superimposed and displayed on the display when moving forward while turning left when entering the parking lot. It is a top view which shows the drawing method of the locus | trajectory in case the direction of a parking frame makes 90 degrees with respect to the approach path of a parking lot. It is a top view which shows the drawing method of the locus | trajectory in case the direction of a parking frame does not make 90 degrees with respect to the approach path of a parking lot. It is the figure which showed the range of the locus | trajectory by the image | video of the parking frame superimposed on the display of the parking assistance apparatus of embodiment, and the predetermined range of the steering angle virtually on the plane. It is the figure which showed another example of the display of FIG. It is the top view which showed the position of the own vehicle in the time T1-T4 in FIG. It is a figure which shows the image | video of the parking frame actually displayed on the display of the parking assistance apparatus of embodiment before time T1 of FIG. It is a figure which shows the image | video and locus | trajectory of the parking frame actually displayed on the display of the parking assistance apparatus of embodiment at the time T1 of FIG. It is a figure which shows the image | video and locus | trajectory of the parking frame actually displayed on the display of the parking assistance apparatus of embodiment at the time T2 of FIG. It is a figure which shows the image | video and locus | trajectory of the parking frame actually displayed on the display of the parking assistance apparatus of embodiment at the time T3 of FIG. It is a figure which shows the image | video and locus | trajectory of the parking frame actually displayed on the display of the parking assistance apparatus of embodiment at the time T4 of FIG.

  Hereinafter, a parking assistance apparatus according to an embodiment of the present invention will be described with reference to the drawings. The parking assist device 10 of this embodiment includes an assist switch 11, a steering angle sensor 12, a yaw rate sensor 13, a vehicle speed sensor 14, a transmission shift position sensor 15, a GPS 16, a rear camera 17, a laser radar 18, a sonar 19, an ECU 20, and a display 31. A speaker 32, an accelerator actuator 41, a brake actuator 42, and a steering actuator 43.

  The support switch 11 is a switch for displaying an image behind the host vehicle captured by the rear camera 17 on the display 31 by a driver's operation. As will be described later, in the present embodiment, after the support switch 11 is turned on by the driver's operation, the travel locus and the travel locus area when the host vehicle moves backward are superimposed on the image behind the host vehicle on the display 31. Displayed. Note that the support switch 11 can display only the image behind the host vehicle when operated by the driver.

  The rudder angle sensor 12 is a sensor that detects a rudder angle that is an angle of the front tire with respect to the front-rear direction of the host vehicle. The yaw rate sensor 13 is a sensor that detects the yaw rate of the host vehicle using a gyro sensor or the like. The vehicle speed sensor 14 is a sensor that detects the vehicle speed of the host vehicle by detecting the rotational speed of the wheels of the host vehicle. The transmission shift position sensor 15 is a sensor that detects whether the shift position of the transmission of the host vehicle is in the forward “D” position or the reverse “R” position.

  The GPS (Global Positioning System) 16 is for performing positioning of the host vehicle by receiving a signal from GPS hygiene, for example. In the present embodiment, the GPS 16 is not an essential configuration.

  The rear camera 17 is a camera that captures an image behind the host vehicle. The laser radar 18 and the sonar 19 are not essential in the present embodiment, but are for recognizing obstacles, parking frames, and the like around the host vehicle.

  The ECU (electronic control unit) 20 is for controlling the entire host vehicle. The ECU 20 includes a drawing calculation unit 21, a database 22, and a travel control unit 23. The drawing calculation unit 21 stores the signals from the support switch 11, the steering angle sensor 12, the yaw rate sensor 13, the vehicle speed sensor 14, the transmission shift position sensor 15, the GPS 16, the rear camera 17, the laser radar 18 and the sonar 19, and the database 22. This is a device for superimposing and drawing a travel locus area when the host vehicle is moving backward on an image behind the host vehicle based on the information that has been made.

  The database 22 is for storing information relating to turning characteristics such as a turning radius of the host vehicle, dimensions such as a total length, a full width, and a total height of the host vehicle. The database stores information about parking frames such as an angle formed by the traveling direction of the road and the front-rear direction of the parking frame for each parking lot.

  The travel control unit 23 is not essential in the present embodiment, but the support switch 11, the steering angle sensor 12, the yaw rate sensor 13, the vehicle speed sensor 14, the transmission shift position sensor 15, the GPS 16, the rear camera 17, the laser radar 18, and the sonar For driving the accelerator actuator 41, the brake 42, and the steering actuator 43 based on the signal from the signal 19 and the information stored in the database 22 to intervene in the driving operation of the driver and provide parking assistance It is.

  The display 31 displays an image behind the host vehicle captured by the rear camera 17. In addition, the display 31 superimposes and displays a traveling locus (rear wheel locus) and a traveling locus range when the host vehicle is moving backward on an image behind the host vehicle. The display 22 can be an independent liquid crystal display or the like for parking assistance. Or the display 22 is good also as a display for navigation systems. The speaker 32 is for providing parking assistance to the driver by voice.

  The accelerator actuator 41, the brake 42, and the steering actuator 43 are not essential in the present embodiment, but the accelerator operation, the brake operation, and the steering operation are intervened in the driving operation of the driver according to the command signal from the travel control unit 23 of the ECU 20, respectively. To do. Alternatively, the accelerator actuator 41, the brake 42, and the steering actuator 43 may intervene in the driving operation of the driver by giving reaction force or haptic feeling to the accelerator pedal, the brake pedal, and the steering wheel, respectively.

  Hereinafter, operation | movement of the parking assistance apparatus 10 of this embodiment is demonstrated. First, an outline of the operation will be described with reference to FIGS. As shown in FIG. 3, a situation is assumed in which the host vehicle VM on which the parking assist device 10 of the present embodiment is mounted is traveling on a track of a parking lot. In the example of FIG. 3, the running direction of the parking lot and the front-rear direction of the parking frame P are 90 °, and the other vehicle VO is also stopped. Here, as shown in FIG. 2, the support switch 11 is turned on by the driver of the host vehicle VM (S11). At this time, an image behind the host vehicle VM by the rear camera 17 is displayed on the display 31.

  By the operation of the driver who sees the display on the display 31, the host vehicle VM travels at an angle with the running direction of the parking lot in order to reduce the angle between the front-rear direction of the parking frame P and the front-rear direction of the host vehicle VM. The vehicle advances while turning to increase the angle θ and passes through the locus L1. The trajectory L1 in this case is free according to the driver's operation, and the host vehicle VM passes through trajectories L1 of various advance angles θ. At this time, the drawing calculation unit 21 of the parking assist device 10 performs processing as described later (S12 to S14). Regardless of the steering angle of the host vehicle VM at that time, a trajectory or a predetermined range of a predetermined steering angle. The range of the trajectory with a fixed steering angle is superimposed on the image behind the host vehicle VM by the rear camera 17 and displayed on the display 31 (S15).

  The host vehicle VM stops after reaching the turning point TP1 by the driver's operation viewed using the display 31 as a guide. At this time, when the drawing calculation unit 21 of the parking assistance apparatus 10 detects that the transmission shift position is set to the reverse “R” position by the transmission shift position sensor 15 or the like (S16), the drawing of the host vehicle VM at that time One type of locus L2 corresponding to the steering angle and a locus L3 parallel to the front-rear direction of the parking frame P are superimposed on the rear image and displayed on the display 31 (S17). By the operation of the driver viewing the display on the display 31, the host vehicle VM moves backward while turning in the direction opposite to the locus L1, and passes through the locus L2. When the host vehicle VM reaches the turning point TP2, the host vehicle VM retreats at a steering angle of 0 ° and passes through the locus L3 by the operation of the driver who views the display 31. Finally, the host vehicle VM parks in the parking frame P.

  Hereinafter, each operation will be described in detail. As shown in FIG. 4, when the host vehicle VM enters a parking lot where parking frames are installed on both sides of the parking lot runway, after the support switch 11 is turned on (S <b> 11), the parking assistance device 10. The drawing calculation unit 21 of the ECU 20 initializes the traveling angle θ of the host vehicle VM to the traveling angle θ = 0 (S12). The drawing calculation unit 21 is an angle formed by the rudder angle sensor 12, the yaw rate sensor 13, the vehicle speed sensor 14 or the GPS 16 and information stored in the database 22 and the front-rear direction of the host vehicle VM and the direction of the parking lot track. The magnitude and direction of the advance angle θ are acquired (S13).

  In this case, the traveling angle θ is acquired by assuming that the host vehicle VM is traveling in parallel with the direction of the parking lot when the support switch 11 is turned on, and initializing the traveling angle θ = 0. Based on the detected values of the steering angle sensor 12, the yaw rate sensor 13, and the vehicle speed sensor 14, the magnitude and direction of the traveling angle θ can be acquired. Alternatively, the magnitude and direction of the traveling angle θ can be acquired from information acquired by the GPS 16 and information stored in the database 22. Furthermore, in this embodiment, the relationship between the front-rear direction of the parking frame P and the front-rear direction of the host vehicle VM is determined by the advance angle θ. The relationship between the front-rear direction of the parking frame P and the front-rear direction of the host vehicle VM can also be acquired by the distance from the VM or the distance or angle between the other vehicle VO parked in the parking frame P and the host vehicle VM. it can.

  When the advance angle θ is equal to or greater than the threshold value (S14), the drawing calculation unit 21 automatically determines the trajectory range with a constant rudder angle or the trajectory range with a predetermined rudder angle by the rear camera 17 according to the magnitude and direction of the advance angle θ. The image is superimposed on the image behind the vehicle VM and displayed on the display 31 (S15).

  In the present embodiment, the locus and the range of the locus are actually superimposed on the rear image of the host vehicle VM by the rear camera 17, but in the following description, the locus displayed on the display 31 for convenience of explanation. In the following description, it is assumed that the range of the trajectory is virtually represented as a bird's-eye view on a plane. However, in the present embodiment, an image behind the host vehicle VM may be actually displayed as a bird's-eye view image on the display 31 and a trajectory followed by the host vehicle VM may be displayed superimposed on the bird's-eye view image. Or the locus | trajectory which the own vehicle VM traces may be superimposed and displayed on maps, such as a navigation system.

  For example, when the host vehicle VM moves forward on the right side of the parking lot and draws a locus L1, as shown in FIG. 5, the drawing calculation unit 21 sets a constant steering angle on the left side in the opposite direction. A trajectory L2 that is a trajectory of a pair of rear wheels when steered is drawn. The trajectory L2 extends backward from the current position of the host vehicle VM, and is parallel to the front-rear direction of the parking frame P at a turning point TP2 that is the rear end portion. In addition, the drawing calculation unit 21 draws a locus L3 that is a locus of a pair of rear wheels when steering is performed at a steering angle 0 from the turning point TP2 that is the rear end portion of the locus L2. The locus L3 is parallel to the front-rear direction of the parking frame P.

  As shown in FIG. 6, a parking frame P photographed by the rear camera is displayed on the display 31. As shown in FIG. 7, the drawing calculation unit 21 displays the trajectory L2 and the trajectory L3 in FIG. 5 superimposed on the image of the parking frame P in FIG. On the other hand, when the host vehicle VM moves forward while turning to the left side of the parking lot and draws a trajectory L1, as shown in FIG. 8, the drawing calculation unit 21 sets a fixed steering angle on the right side in the opposite direction. The trajectory L2 and the trajectory L3, which are the trajectories of the pair of rear wheels when the vehicle is steered, are superimposed and displayed on the image of the parking frame P in the same manner as in FIG.

  In addition, as a method for determining whether the host vehicle VM is parked in the left or right parking frame P, it is possible to use a driver's input operation, or based on the GPS 16 positioning information and information stored in the database 22 in advance. It may be set for each parking lot whether to park in the left or right parking frame P.

  Hereinafter, a method of drawing the loci L2 and L3 on the display 31 will be described in detail. As shown in FIG. 9, when the direction of the parking lot runway and the front-rear direction of the parking frame P are 90 °, the drawing calculation unit 21 has a center angle of (90 ° −advance angle | θ | ) Is drawn with respect to a predetermined rudder angle from a pair of rear wheels of the host vehicle VM, a locus L2 parallel to the front-rear direction of the parking frame P can be drawn at the rear end. The drawing calculation unit 21 can draw the locus L3 by extending a straight line from the rear end portion of the locus L2 in the same direction as the rear end portion of the locus L2.

  As shown in FIG. 10, when the direction of the parking lot runway and the front-rear direction of the parking frame P are inclined at | θp | other than 90 °, the drawing calculation unit 21 has a center angle of ( By drawing a circular arc of | θp | −advance angle | θ |) with a predetermined rudder angle from a pair of rear wheels of the host vehicle VM, a trajectory L2 parallel to the front-rear direction of the parking frame P is drawn at the rear end. be able to. About the locus | trajectory L3, it is the same as that when the direction of the runway of a parking lot and the front-back direction of the parking frame P have comprised 90 degrees.

  By using the methods of FIGS. 9 and 10, the drawing calculation unit 21 increases the angle L2 of the curve portion as the angle formed by the front-rear direction of the parking frame P in which the host vehicle VM is parked and the front-rear direction of the host vehicle increases. The length is displayed longer, and the length of the locus L2 of the curved portion is shortened and displayed as the angle formed by the front-rear direction of the parking frame P in which the host vehicle VM is parked and the front-rear direction of the host vehicle decreases.

  Further, in the case of parallel parking where the direction of the parking lot runway and the front-rear direction of the parking frame are the same, the drawing calculation unit 21 has two arcs having the same center angle and different left and right turning directions. By displaying a trajectory combining the straight line and the image on the display 31 so as to be superimposed on the image of the parking frame P, the driver of the host vehicle VM can be notified of the reverse start position.

  In addition, the parking assistance apparatus 10 can also recognize the parking frame P and the other vehicle VO by the laser radar 18, the sonar 19, and the like, and can inform the driver of the own vehicle VM by a voice by the speaker 32. Alternatively, the parking assist device 10 can forcibly intervene in the driver's driving and notify the driver of the host vehicle VM of the reverse start position by the travel control unit 23, the brake actuator 42, and the steering actuator 43. Further, the parking assist device 10 applies a reaction force or a haptic feeling to the accelerator pedal or the steering wheel by the travel control unit 23, the accelerator actuator 41, and the steering actuator 43, thereby setting the reverse start position to the driver of the host vehicle VM. Can also be notified.

  In addition, the parking assist device 10 displays the rear image of the display 31 after the host vehicle VM stops at the reverse start position such as the turning point TP1, and the driver of the host vehicle VM has any locus L2 on any parking frame P. , L3 may be set for parking. Even when the driver forgets to operate the support switch 11, the parking support device 10 uses the information of the laser radar 18, the sonar 19, the GPS 16, the database 22, etc. The other vehicle VO may be recognized, the advance angle θ and the front-rear direction of the parking frame P may be estimated, and similarly, the locus L2 and the locus L3 may be superimposed on the image of the parking frame P and displayed.

  Note that the trajectories L2 and L3 based on the angle between the front-rear direction of the host vehicle VM and the front-rear direction of the parking frame P do not correspond to the steering angle at that time of the host vehicle VM, and at least stop of the host vehicle VM. Any structure may be used as long as it is displayed on the display 31 while the vehicle is moving forward or forward, and may be always displayed even when the vehicle is moving backward. Alternatively, as described above, at the time of reverse, only one type of trajectories L2 and L3 corresponding to the steering angle of the host vehicle VM at that time is displayed on the display 31, and corresponding to the current steering angle of the host vehicle VM. Alternatively, the loci L2 and L3 based on the angle between the front-rear direction of the host vehicle VM and the front-rear direction of the parking frame P may be deleted from the display 31.

  In the above example, whether the host vehicle VM is moving forward, stopped, or moving backward is determined by the detection value of the transmission shift position sensor 15, but the operation of the accelerator, the brake, etc., the vehicle speed sensor 14, and the GPS 16 Using the detected value or the like, it may be determined whether the host vehicle VM is moving forward, stopped, or moving backward.

  As shown in FIGS. 7 to 10, the drawing calculation unit 21 can display one type of trajectories L2 and L3 on the display 31, but in the present embodiment, different turning radii (steering angles) are provided. It is possible to display the range of the locus L2 by the arc and the locus L3 following the locus L2. As shown in FIG. 11, the drawing calculation unit 21 may display, for example, a locus L2 based on the steering angle α1 that is the maximum steering angle and a locus L2 ′ based on the steering angle α2 that is 70% of the maximum steering angle. it can. Linear trajectories L3 and L3 'extend from turning points TP2 and TP2' which are rear ends of the trajectories L2 and L2 ', respectively. The drawing calculation unit 21 displays the range surrounded by the trajectories L2 to L3 'for each of the pair of rear wheels as the trajectory range Z, and displays the image on the parking frame P in a shaded manner on the display 31.

Alternatively, the drawing operation unit 21, as shown in FIG. 12, the range surrounded by the locus L2, L3 for the rear wheel of the pair to the locus range Z _1, the trajectory L2 for the rear wheel of the pair ', L3' surrounded by range as trajectory range Z _4, can be superimposed on the image of the parking frame P by shading on the display 31. Further, the drawing calculation unit 21 draws a locus in a similar manner for each predetermined angle with respect to the steering angle between the locus L2 and L2 ′, and displays a range surrounded by a pair of rear wheels as locus ranges Z ₂ and Z ₃ . be able to. Thereby, a plurality of candidates for the reverse start position can be presented to the driver.

  Hereinafter, the example of the image | video actually displayed on the display 31 in the parking assistance apparatus 10 of this embodiment is demonstrated. In the following description, as illustrated in FIG. 13, a description will be given assuming a situation in which the host vehicle VM is parked with respect to a parking frame P having white lines A to C. When the driver switch 11 is turned on by the driver while the host vehicle VM is traveling straight on the parking lot runway, as shown in FIG. 14, an image behind the host vehicle VM is displayed on the display 11 by the rear camera 17. Is displayed.

  In the present embodiment, the drawing calculation unit 21 starts the superimposed display of the trajectories L2 and L3 and the trajectory range Z after the parking frame P is displayed on the video on the display 31 unless there is an operation by the driver in principle. . In order to start the superimposed display of the trajectories L2 and L3 and the trajectory range Z after the parking frame P is displayed on the image of the display 31, as described above, the drawing operation is performed after the advance angle θ becomes equal to or greater than a predetermined threshold. The unit 21 is enabled by starting display of the trajectories L2 and L3 and the trajectory range Z. Alternatively, the drawing calculation unit 21 recognizes the parking frame P using the laser radar 18, the sonar 19, the GPS 16, the database 22, and the like, thereby estimating the time and place where the parking frame P is displayed on the display 31 image. Thus, the superimposition display of the trajectories L2 and L3 and the trajectory range Z can be started after the parking frame P is displayed on the video of the display 31. In this case, immediately before the parking frame P in which the host vehicle VM is parked is displayed in the image behind the host vehicle VM, or when the host vehicle VM is parked in the image behind the host vehicle VM. It may be the time when the frame P is displayed.

  When the time T1 is reached and the advance angle θ exceeds the threshold, the drawing calculation unit 21 superimposes and displays the trajectories L2 to L3 'and the trajectory range Z on the rear image on which the parking frame P is displayed, as shown in FIG. When the advance angle θ increases from time T2 to time T3, the locus L2 and L2 ′ of the curved portion becomes shorter as shown in FIGS.

  At time T3, the driver viewing the parking frame P and the trajectory range Z on the display 31 determines that the host vehicle VM has arrived at the reverse start position, stops the host vehicle VM, and then moves backward. . At time T4 when the host vehicle VM starts to move backward, as shown in FIG. 18, the drawing calculation unit 21 displays only one type of trajectories L2 and L3 based on the steering angle detected by the steering angle sensor 12 of the host vehicle VM. indicate. When the rudder angle is changed, the loci L2 and L3 are also changed and displayed on the display 31.

  According to the present embodiment, the drawing calculation unit 21 and the display 31 that display an image behind the host vehicle VM can be traced when the host vehicle VM moves backward from the point where the host vehicle is currently located. A trajectory range Z including the types of trajectories L2 to L3 ′ is displayed so as to overlap the image behind the host vehicle VM. For this reason, for the driver, a plurality of loci L2 to L3 'having different steering angles and the like are options. Therefore, for example, even when the host vehicle VM is retreated at the maximum rudder angle and passes through a point where the host vehicle VM can be parked in the parking frame P, a plurality of trajectories with different rudder angles and the like are different. By selecting, it becomes easy to absorb the variation in the reverse start position and park the host vehicle VM in the parking frame P.

  In other words, with only a circular arc having a constant turning radius, the point where the parking frame P and the tracks L2 and L3 overlap is a single point when the track L1 is allowed to travel freely, and passes the stop position for starting the reverse. It may be difficult to stop. On the other hand, in the present embodiment, since there is a degree of freedom in the candidate stop positions to be guided, the host vehicle VM can be easily stopped at the reverse start position. Further, in the present embodiment, even in a place where the parking frame P is not clearly displayed with a white line or the like, the tracks L2 and L3 displayed in a superimposed manner are matched with the target parking position displayed on the display 31. The driver can know an appropriate reverse start position. Furthermore, in this embodiment, the driver can know the parking position and the reverse start position even from a position away from the parking frame P by adjusting the length of the linear trajectories L3, L3 '.

  Moreover, in this embodiment, the drawing calculation part 21 and the display 31 which display the image | video behind the own vehicle VM are according to the time when the parking frame P which the own vehicle VM parks is displayed in the image behind the own vehicle VM. For example, after the time when the parking frame P is displayed, the trajectories L2, L3, etc. that are traced when the host vehicle VM retreats from the point where the host vehicle VM is currently located are displayed superimposed on the image behind the host vehicle VM. For this reason, it is easier for the driver of the host vehicle VM to grasp the reverse start position of the host vehicle VM, compared to a device that displays a trajectory traced when the host vehicle VM does not display the parking frame P. It becomes easy to park the own vehicle VM in the parking frame P. Here, displaying the loci L2, L3, etc. according to the time when the parking frame P is displayed means that the time when the parking frame P is displayed does not coincide with the time when the loci L2, L3, etc. are displayed. However, when the situation where the parking frame P is displayed approaches or after a while after the parking frame P is displayed, the heads of the loci L2 and L3 may be displayed. In any configuration, since the locus is not displayed in a situation far from the parking frame, annoyance is reduced. Whether or not to display the trajectories L2, L3, etc. is determined based on the advance angle θ, image recognition of the environment outside the host vehicle VM such as the parking frame P, and recognition using map information and position information. Technology is also possible.

  In addition, according to the present embodiment, the drawing calculation unit 21 and the display 31 that display an image behind the host vehicle VM follow the locus L2, when the host vehicle VM moves backward from the current position when the host vehicle moves forward. L3 is displayed superimposed on the image behind the host vehicle VM, a track having a locus L2 which is a curved portion and a track L3 which is a straight line portion is displayed, and the front and rear directions of the parking frame P in which the host vehicle VM is parked. The length of the locus L2 that is a curved portion is changed and displayed according to the angle formed by the front-rear direction of the VM. For this reason, the driver turns the host vehicle VM backward while turning the host vehicle VM from the position where the host vehicle VM is currently located, and moves the host vehicle VM at a steering angle of 0 at a position where the directions of the host vehicle VM and the parking frame P are parallel. It becomes easy to intuitively grasp the guideline for the backward operation.

  Further, according to the present embodiment, when the host vehicle VM moves forward, the trajectories L2 and L3 traced when the host vehicle VM moves backward from the current position are displayed on the video behind the host vehicle VM, and the curved portion is displayed. A trajectory that has a trajectory L2 and a trajectory L3 that is a straight line portion is displayed, and a trajectory that is a curved portion increases as the angle formed by the front-rear direction of the parking frame P in which the host vehicle VM is parked and the front-rear direction of the host vehicle VM increases. L2 is displayed with a longer length. For this reason, the driver turns the host vehicle VM backward while turning the host vehicle VM from the position where the host vehicle VM is currently located, and moves the host vehicle VM at a steering angle of 0 at a position where the directions of the host vehicle VM and the parking frame P are parallel. It becomes easy to intuitively grasp the guideline for the backward operation.

  In the present embodiment, the trajectories L2 and L3 that are not linked to the steering angle of the host vehicle VM are displayed when the host vehicle VM moves forward. Therefore, the drawing calculation unit 21 does not necessarily recognize the position of the parking frame P and the like, and the loci L2 and L3 are only required if the front-rear direction of the parking frame P and the traveling angle θ of the host vehicle VM are known. Can be displayed. Therefore, an apparatus such as an ECU for recognizing the parking frame P is not required, and the apparatus can be configured at low cost.

  In the present embodiment, the drawing calculation unit 21 and the display 31 display a trajectory having a trajectory L2 that is a curved portion and a trajectory L3 that is a straight portion, and is a curved portion rearward from the point where the host vehicle VM is currently located. The trajectory L2 extends, and a trajectory is displayed in which the trajectory L3, which is a straight line portion, extends from the rear end portion of the trajectory L2, which is a curved portion. For this reason, the driver can park the host vehicle VM in the parking frame P by performing an operation of moving the host vehicle VM backward while turning and an operation of moving the host vehicle VM backward by setting the steering angle of the host vehicle VM to 0. This makes it easier to park the host vehicle VM in the parking frame P.

  Moreover, in this embodiment, the drawing calculation part 21 and the display 31 are points where the trajectory L2 that is a curved portion from the point where the host vehicle VM is currently located and the front-rear direction of the parking frame P where the host vehicle VM is parked are parallel. The trajectory L2 that is a curved portion extends to the front, and a trajectory in which the front-rear direction of the parking frame P in which the host vehicle VM is parked and the trajectory L3 that is a linear portion is parallel is displayed. For this reason, if the driver moves the host vehicle VM backward by setting the steering angle to 0 at the turning point TP2 where the track L2 that is the curved portion of the displayed track changes to the track L3 that is the straight line portion, Since it can be made parallel to the parking frame P, it becomes even easier to park the host vehicle VM in the parking frame P.

  In the present embodiment, the drawing calculation unit 21 and the display 31 display one type of trajectory followed by the host vehicle VM according to the steering angle of the host vehicle VM when the host vehicle VM is moving backward. For this reason, the driver can easily grasp the trajectory of the host vehicle VM according to the steering angle of the host vehicle VM when the host vehicle VM is moving backward. In particular, when a display including a plurality of trajectories that can be traced when the host vehicle VM retreats from a point where the current vehicle VM is retreated at any time during forward movement or stoppage, The play generated by the trajectory can be absorbed, and the host vehicle VM can be easily parked in the parking frame P accurately.

  In the present embodiment, the loci L2 and L3 when the host vehicle VM moves backward in the steering direction opposite to the steering direction when the host vehicle VM moves forward are displayed. This eliminates the need for the driver to select which direction the left and right directions are to be displayed for the most frequently used parking method, and makes the operation at the time of parking easier. In the present embodiment, the drawing calculation unit 21 does not necessarily recognize the position or the like of the parking frame P. If the azimuth in the front-rear direction of the parking frame P and the traveling angle θ of the host vehicle VM are known, driving is performed. The trajectories L2 and L3 can be displayed without specifying whether the person parks in the left or right parking frame P. Therefore, an apparatus such as an ECU for recognizing the parking frame P is not required, and the apparatus can be configured at low cost.

  On the other hand, in this embodiment, the drawing calculation unit 21 and the display 31 that display an image behind the host vehicle VM are one type of trajectory traced when the host vehicle VM moves backward from the current position when the host vehicle VM moves forward. L2 and L3 having a locus L2 that is a curved portion extending backward from a point where the host vehicle VM is currently located and a locus L3 that is a straight portion extending from the rear end portion of the locus L2 that is a curved portion. From the point where the vehicle VM is currently located, the locus L2 which is a curved portion extends to a point where the locus L2 which is a curved portion is parallel to the front-rear direction of the parking frame P where the own vehicle VM is parked, and parking where the own vehicle VM is parked It is also possible to display a trajectory in which the front-rear direction of the frame P is parallel to the trajectory L3 that is a straight line portion. For this reason, it is easy for the driver to intuitively understand the locus during parking. In addition, the driver makes the steering angle of the host vehicle VM 0 at the turn-back position TP2 at which the driver turns the host vehicle VM backward while turning, and L2 that is the curved portion of the trajectory displayed thereafter changes to L3 that is the straight portion. Thus, the host vehicle VM can be parked in the parking frame P by performing an operation of moving backward. Therefore, it becomes easier to park the host vehicle VM in the parking frame P.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Parking assistance apparatus, 11 ... Support switch, 12 ... Steering angle sensor, 13 ... Yaw rate sensor, 14 ... Vehicle speed sensor, 15 ... Transmission shift position sensor, 16 ... GPS, 17 ... Rear camera, 18 ... Laser radar, 19 ... Sonar, 20 ... ECU, 21 ... Drawing operation unit, 22 ... Database, 23 ... Running control unit, 31 ... Display, 32 ... Speaker, 41 ... Accelerator actuator, 42 ... Brake actuator, 43 ... Steering actuator.

Claims (6)

It has a display unit that displays the video behind the host vehicle,
The display unit is
At least when the host vehicle is moving forward, a trajectory traced when the host vehicle retreats from a point where it is currently located is displayed superimposed on the image behind the host vehicle,
Displaying the trajectory having a curved portion;
A parking assistance device that displays a longer length of the curved portion as the angle between the front-rear direction of the parking frame in which the host vehicle parks and the front-rear direction of the host vehicle increases. The parking support device according to claim 1 , wherein the display unit displays the locus having the curved portion and the straight portion. The parking support device according to claim 2 , wherein the display unit displays the locus in which the curved portion extends backward from a point where the host vehicle is currently located and the linear portion extends from a rear end portion of the curved portion. . The display unit has a parking frame in which the curved portion extends from a point where the host vehicle is currently located to a point where the curved portion and the front and rear direction of the parking frame in which the host vehicle is parked are parallel, and the host vehicle is parked The parking assistance device according to claim 3 , wherein the trajectory in which the front-rear direction and the straight line portion are parallel is displayed. The parking support according to any one of claims 1 to 4 , wherein the display unit displays one type of the trajectory followed by the host vehicle according to a steering angle of the host vehicle when the host vehicle is moving backward. apparatus. The parking support device according to any one of claims 1 to 5 , wherein the display unit displays the trajectory when the host vehicle moves backward in a steering direction opposite to a steering direction when the host vehicle moves forward.

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