JP5504009B2 - Electric car - Google Patents

Description

  The present invention relates to an electric vehicle that performs battery charging by a non-contact charging system, and particularly relates to alignment of a power receiving unit disposed below the floor of the electric vehicle and a power feeding unit disposed on the ground.

  Conventionally, in an electric vehicle that uses a non-contact charging system to charge a battery, the vehicle is parked at a predetermined position, and charging is performed with a power receiving unit provided on the vehicle side facing a power supply unit on the ground. It is like that. Although the power receiving unit and the power feeding unit are remarkably lowered in charging efficiency due to a positional shift when facing each other, the user cannot accurately grasp the positions of the power receiving unit and the power feeding unit while driving. Therefore, in recent years, by detecting the position in the width direction of the vehicle, the positional deviation between the power receiving unit provided in the vehicle and the power feeding unit provided in the charger is detected and notified to the user. And the charging is started when it is detected that the position of the charging unit and the power feeding unit has become a chargeable position (see, for example, Patent Document 1).

JP-A-9-182212

However, in the conventional system, since the location of the power feeding unit is uniquely determined, for example, when the arrangement of the power receiving unit on the vehicle side is moved, the positional relationship between the power receiving unit and the power feeding unit cannot be grasped. As a result, the burden on the user for alignment increases and the charging efficiency may decrease.
And in the conventional system, since unification of arrangement | positioning of a receiving part is requested | required by all the electric vehicles, there exists a subject that the freedom degree of an apparatus layout falls.

  The present invention has been made in view of the above circumstances, and is an electric vehicle capable of accurately and easily aligning the power receiving unit and the power feeding unit while improving the degree of freedom of arrangement of the power receiving unit that performs non-contact charging. Is to provide.

  In order to solve the above-described problem, the invention described in claim 1 includes a travel motor (for example, the travel motor 2 in the embodiment) and a power storage device (for example, the embodiment) that stores electric power supplied to the travel motor. The high-voltage battery 6) in the vehicle, the power receiving unit (for example, the power receiving coil 8 in the embodiment) disposed under the floor, and the navigation for displaying the vehicle travel information on a monitor (for example, the monitor 17 in the embodiment) provided in the vehicle interior. In a contactless rechargeable electric vehicle (for example, the electric vehicle 1, 100 in the embodiment) provided with a system (for example, the navigation system 16 in the embodiment), it is provided in the vicinity of the power receiving unit or integrally with the power receiving unit. The underfloor camera (for example, the underfloor camera 12 in the embodiment, the first A lower camera 12a, a second underfloor camera 12b), and an approach detecting means (for example, an approach detecting means 20 in the embodiment) for detecting the approach of a power feeding unit (for example, the power feeding coil 9 in the embodiment) arranged on the road; Monitor display information switching means (for example, monitor display information switching means 21 in the embodiment) for switching to display the video of the underfloor camera on the monitor when the approach detection means detects the approach to the power feeding unit. It is characterized by providing.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the monitor displays a virtual position of the power receiving unit (for example, the target mark 25 in the embodiment).

  The invention described in claim 3 is the invention according to claim 2, wherein the monitor displays a deviation amount from the virtual position to the power feeding unit.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein a back view camera (for example, the back view camera 11 in the embodiment) for photographing the rear of the vehicle is provided, and the back view is provided. It is characterized in that at least a part of a video range photographed by the camera and a video range photographed by the underfloor camera overlap each other.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the approach detection unit may be configured such that the video of the power feeding unit cannot be captured by the back view camera or the power feeding unit by the underfloor camera. When an image of the above is captured, the approach of the power feeding unit is detected.

  According to a sixth aspect of the present invention, in the fourth aspect of the present invention, when the shift position is in the backward position, the monitor divides a display area and images of the back view camera and the underfloor camera. Are simultaneously displayed.

According to the seventh aspect of the present invention, vehicle travel information is displayed on a travel motor, a power storage device that stores electric power supplied to the travel motor, a power receiving unit disposed under the floor, and a monitor provided in the vehicle interior. the contactless rechargeable electric vehicle that includes a navigation system that, before Symbol receiving portion provided integrally with, comprising a floor camera installed facing road surface direction in the floor, the monitor, the underfloor camera And a display for grasping the position of the power receiving unit on the monitor.

  The invention described in claim 8 is characterized in that, in the invention described in claim 7, the monitor displays a virtual position of the power receiving unit in the underfloor camera.

  The invention described in claim 9 is the invention according to claim 7 or 8, wherein the monitor displays a shift amount in a horizontal direction between the power receiving unit and a power feeding unit arranged on a road. .

  According to a tenth aspect of the present invention, in the invention according to any one of the seventh to ninth aspects, an approach detecting unit that detects an approach of a power feeding unit disposed on a road, and the power feeding unit by the approach detecting unit. And monitor display information switching means for switching to display the video of the underfloor camera on the monitor when an approach to the vehicle is detected.

  The invention described in claim 11 is characterized in that in the invention described in any one of claims 7 to 10, switching operation means for switching the display of the monitor to the image of the underfloor camera is provided.

According to the first aspect of the present invention, when the power receiving unit is arranged under the floor, and the approach detection unit detects the approach to the power supply unit on the road, the monitor display information switching unit displays the video of the underfloor camera. By switching so that the image is displayed on the monitor, the user can steer and guide the power reception unit so as to face the power supply unit while visually checking the image on the monitor. Accordingly, since the degree of freedom of arrangement of the power receiving unit under the vehicle floor is improved, there is an effect that the degree of freedom of device layout under the vehicle floor can be improved.
Furthermore, the user can easily align the power receiving unit and the power feeding unit while visually checking the video on the monitor, thereby reducing the burden on the user and accurately aligning the power receiving unit and the power feeding unit. Therefore, it is possible to prevent a decrease in charging efficiency.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the power receiving unit and the power feeding unit are opposed to each other by matching the positions of the virtual position and the power feeding unit on the monitor. Effective positioning can be achieved and the burden on the user can be further reduced.

  According to the invention described in claim 3, in addition to the effect of claim 2, the user can recognize the positional shift between the virtual position and the power feeding unit as the shift amount, so that the position can be more accurately aligned. There is.

  According to the invention described in claim 4, in addition to the effect of any one of claims 1 to 3, a part of the shooting range of the back view camera 11 and the underfloor camera overlaps, so that the back view camera When the vehicle is moved backward while visually confirming the power feeding unit photographed by the monitor, and the power feeding unit gradually approaches the vehicle, and the power feeding unit comes out of the shooting area of the back view camera, the power feeding unit is Therefore, there is an effect that it is possible to suppress the user from losing sight of the power feeding unit and to smoothly align the power feeding unit and the power receiving unit.

  According to the invention described in claim 5, in addition to the effect of claim 4, when the video of the power feeding unit cannot be captured by the back view camera or when the video of the power feeding unit is captured by the underfloor camera, Since it is possible to detect that the vehicle is approaching, there is an effect that the power receiving unit and the power feeding unit can be positioned smoothly without losing sight of the power feeding unit from the monitor image.

  According to the sixth aspect of the present invention, in addition to the effect of the fourth aspect, when the shift position of the vehicle is in the backward position, the display area of the monitor is divided, and the image of the back view camera and the underfloor camera are divided. Since the user can smoothly track the power feeding unit with the video of each camera, the power receiving unit and the power feeding unit can be safely positioned.

According to the seventh aspect of the present invention, the power receiving unit is arranged under the floor, and the user can steer and guide the power receiving unit to face the power feeding unit while visually checking the monitor image. There is an effect that the degree of freedom of arrangement of the power receiving unit under the floor is improved, and therefore the degree of freedom of device layout under the floor of the vehicle can be improved.
Further, the user aligns the power receiving unit and the power feeding unit while visually checking the virtual position of the power receiving unit in the video of the underfloor camera displayed on the monitor or the horizontal shift amount of the power receiving unit and the power feeding unit arranged on the road. Therefore, the burden on the user can be reduced, and the power receiving unit and the power feeding unit can be accurately aligned. Therefore, the charging efficiency can be prevented from being lowered.

  According to the eighth aspect of the invention, in addition to the effect of the seventh aspect, the power receiving unit and the power feeding unit are arranged to face each other by matching the positions of the virtual position and the power feeding unit on the monitor. Effective positioning can be achieved and the burden on the user can be further reduced.

  According to the ninth aspect of the invention, in addition to the effect of the seventh or eighth aspect, since the user can recognize the positional deviation between the virtual position and the power feeding unit as the deviation amount, more accurate alignment can be performed. There is an effect that can be done.

  According to the tenth aspect of the present invention, in addition to the effect of any one of the seventh to ninth aspects, when the approach detection unit detects an approach to the power feeding unit on the road, the monitor display information switching unit Since the image of the underfloor camera can be automatically switched to be displayed on the monitor of the navigation system, there is an effect that the burden on the user can be reduced.

  According to the eleventh aspect of the invention, in addition to the effect of any one of the seventh to tenth aspects, the display of the monitor can be switched by the switching operation means when the user wants to see the image of the underfloor camera. Therefore, there is an effect that the convenience can be improved.

1 is a perspective view showing a schematic configuration of an electric vehicle according to a first embodiment of the present invention. It is a block diagram which shows the structure of positioning ECU of the electric vehicle in 1st Embodiment of this invention. It is a figure which shows an example of the image | video of the back view camera displayed on the monitor in 1st Embodiment of this invention. It is a figure which shows an example of the image | video of the underfloor camera displayed on the monitor in 1st Embodiment of this invention. It is a flowchart which shows the control processing of positioning ECU in 1st Embodiment of this invention. It is a side view which shows schematic structure of the electric vehicle in 2nd Embodiment of this invention. It is a figure which shows an example of the image | video of an underfloor camera in case the deviation | shift amount in 2nd Embodiment of this invention is larger than a regulation value. It is a figure which shows an example of the image | video of an underfloor camera in case the deviation | shift amount in 2nd Embodiment of this invention is below a regulation value. It is a flowchart equivalent to FIG. 5 in 2nd Embodiment of this invention. It is a side view equivalent to FIG. 6 in 3rd Embodiment of this invention. It is the arrow line view seen from the A direction of FIG. 10 in 3rd Embodiment of this invention. 6 is a flowchart corresponding to FIG. 5 in a third embodiment of the present invention. It is a block diagram which shows schematic structure of the electric vehicle in 4th Embodiment of this invention. It is a flowchart equivalent to FIG. 5 in 4th Embodiment of this invention. It is explanatory drawing which shows the transition of the electric vehicle in 4th Embodiment of this invention. It is a figure which shows the example of a display of the monitor in the other Example of 1st Embodiment of this invention. It is a figure which shows the example of a display of the monitor in the other Example of 1st, 2nd embodiment of this invention. It is a bottom view which shows arrangement | positioning of the underfloor camera in the other Example of 1st, 2nd embodiment of this invention. It is a figure which shows the example of a display of the deviation | shift amount in the other Example of 1st-4th Embodiment of this invention.

Next, an electric vehicle according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show a schematic configuration of the electric vehicle 1 of this embodiment.
The electric vehicle 1 includes a travel motor (MOT) 2, and the driving force of the travel motor 2 is distributed and transmitted to the left and right drive wheels 4 and 4 via a gear (not shown). When the driving force is transmitted from the driving wheels 4 and 4 to the traveling motor 2 side when the electric vehicle 1 decelerates, the traveling motor 2 functions as a generator to generate a so-called regenerative braking force, and the kinetic energy of the vehicle body is electrically converted. Recover as energy.

The travel motor 2 is, for example, a DC brassless motor or the like, and is connected to an inverter (not shown) that controls driving and power generation of the travel motor 2. The inverter is connected to a high voltage battery 6 that exchanges power with the traveling motor 2.
The high-voltage battery 6 is disposed under the rear seat or in the vicinity of the floor panel, and is connected to a power receiving unit (not shown) that performs non-contact charging. The power receiving unit includes a power receiving coil 8 attached under the floor such as the lower surface of the floor panel, and charges the high voltage battery 6 by converting the power generated in the power receiving coil 8 by electromagnetic induction into direct current. Here, under the floor means below the floor panel.

  A charging facility (not shown) for charging the high-voltage battery 6 by non-contact charging is provided outside the passenger compartment such as a parking lot, and the power supply coil 9 is installed on the ground (road surface) of a predetermined parking area by being embedded. Has been. When an alternating current is passed through the power feeding coil 9 with the power receiving coil 8 and the power feeding coil 9 facing each other, an alternating current flows through the power receiving coil 8 due to the influence of electromagnetic induction from the power feeding coil 9.

  The electric vehicle 1 includes a back view camera (CCD_Rr) 11 that captures the rear of the vehicle, and an underfloor camera (CCD_UND) 12 that captures the vehicle lower side. These cameras are CCDs or the like, and output their photographing data to the positioning ECU 15. The underfloor camera 12 is a camera for photographing the feeding coil 9 that is mainly installed on the ground in the parking area, and is installed facing substantially vertically downward. The back view camera 11 is installed facing slightly below the rear of the vehicle, which is difficult for the driver to visually recognize. The arrangement of the underfloor camera 12 may be in the vicinity of the power receiving coil 8, but since the frequency of the electric vehicle 1 entering the parking area while retreating is high, the width of the power receiving coil 8 installed under the floor of the vehicle. It is preferable to be arranged adjacent to the vehicle front side in the approximate center of the direction.

The positioning ECU 15 performs display control of the monitor 17 of the navigation system 16 in order to support the alignment operation between the power receiving coil 8 and the power feeding coil 9, and the monitor 17 when the positioning between the charging coil and the power feeding coil 9 is performed. Is switched from the normal navigation screen to the images of the underfloor camera 12 and the back view camera 11 for display control. The monitor 17 is installed, for example, above the center console in the vehicle interior.
The positioning ECU 15 is connected to a shift position sensor 18 that detects a shift position, and can detect a shift position, for example, reverse (for example, “R”), forward (for example, “D”), and the like. Here, the navigation system 16 normally obtains the current position of the vehicle based on GPS signals received from GPS satellites, and executes map matching processing based on the current position of the vehicle and previously stored map data. Then, for example, processing such as route search and route guidance is executed for the destination set in accordance with the input operation of the operator. Then, video and audio related to route guidance are output by the monitor 17 and a speaker (not shown).

The positioning ECU 15 includes an approach detection unit 20 that detects that the power feeding coil 9 has approached the electric vehicle 1, and a monitor display information switching unit 21 that switches and controls the monitor 17 based on the detection result of the approach detection unit 20. .
The approach detection means 20 detects the power supply coil 9 by extracting the power supply coil 9 from the images of the back view camera 11 and the underfloor camera 12 by image processing. Further, the approach detection unit 20 captures an image of the feeding coil 9 when the image of the feeding coil 9 captured by the back view camera 11 is out of the shooting range, for example, when the electric vehicle 1 moves backward, or by the underfloor camera 12. In this case, it is detected that the feeding coil 9 has approached the electric vehicle 1. Here, various approaches can be used to detect the approach of the power supply coil 9. For example, a wireless device capable of near field communication is attached to the power supply coil 9, and the power supply coil 9 and the wireless device on the electric vehicle 1 side are connected. When it is determined that a line has been established, the approach detection unit 20 may detect the approach of the power feeding coil 9.

  The monitor display information switching means 21 performs control to switch the display on the monitor 17 of the navigation system 16 from the normal navigation screen to the video of the underfloor camera 12 when the approach detection means 20 detects the approach of the power feeding coil 9. For example, the monitor display information switching means 21 switches the display on the monitor 17 to the image of the back view camera 11 when the image of the power supply coil 9 is captured by the back view camera 11 and detects the approach of the power supply coil 9. At that time, control for switching to the image of the underfloor camera 12 may be performed. Further, a switching operation means such as a button for switching to an image of the underfloor camera 12 is provided, and the monitor display information switching means 21 monitors the monitor 17 when the switching operation means is operated by the user regardless of the detection result of the approach detection means 20. May be switched to the video of the underfloor camera 12. When the switching operation means is provided as described above, the display on the monitor 17 can be switched when the user wants to view the video of the underfloor camera 12, so that the convenience can be improved.

  FIG. 3 shows an example of a monitor image when the image of the feeding coil 9 is captured by the back view camera 11. On the monitor 17 shown in FIG. 3, a ladder-shaped guide line L for guiding the electric vehicle 1 to the parking area A partitioned by a white line is displayed. The guide line L includes a front / rear guide line La indicating a vehicle width position and a left / right guide line Lb indicating a distance from the rear end of the vehicle. The front / rear guide line La and the left / right guide line Lb are used as a reference. By visually recognizing the video, the user can easily grasp each position of the parking area A relative to the vehicle position.

  On the other hand, FIG. 4 shows an example of a monitor image when an image of the feeding coil 9 is captured by the underfloor camera 12. As shown in FIG. 4, when switching to the image of the underfloor camera 12, the target mark 25, which is a virtual position corresponding to the position of the power receiving coil 8, is displayed on the monitor 17 by the display control of the positioning ECU 15. Displayed in the center. When the user drives and steers and moves the electric vehicle 1 so that the target mark 25 overlaps the power supply coil 9, and the position of the target mark 25 and the position of the power supply coil 9 coincide on the monitor 17, the actual power reception coil 8. And the center of the feeding coil 9 are in a state of being opposed to each other in the vertical direction. Since the arrangement of the power receiving coil 8 may vary depending on the vehicle type and specifications, information on the position of the target mark 25 corresponding to the position of the power receiving coil 8 of the host vehicle is stored in advance in storage means (not shown) such as a nonvolatile memory. Has been.

  When the positioning ECU 15 displays the image of the underfloor camera 12, the horizontal displacement between the center position 26 of the target mark 25 and the center position 27 of the image of the feeding coil 9 (for example, at the screen corner of the monitor 17). ○○ cm etc.) is displayed. The amount of deviation is calculated based on the position of the power feeding coil 9 detected by the positioning ECU 15 and the position of the power receiving coil 8 (or target mark 25) set in advance. When the calculated amount of deviation becomes smaller than a preset value of the amount of deviation, the positioning ECU 15 indicates that the power receiving coil 8 and the power feeding coil 9 are properly opposed to each other by the monitor 17 or the speaker (not shown) of the navigation system 16. Notification output (for example, "OK" display on the monitor 17) is performed.

  The electric vehicle 1 in this embodiment has the above-described configuration. Next, control processing by the positioning ECU 15 of the electric vehicle 1 will be described with reference to a flowchart of FIG.

  First, in a state where the screen of the normal navigation system 16 is displayed on the monitor 17, it is determined based on the detection result of the shift position sensor 18 whether the shift position is reverse (R), that is, in the reverse position (step S001). ). If the shift position is not reverse (No in step S001), it is determined whether or not the feeding coil 9 is approaching (step S002), and if it is not approaching (No in step S002), normal The display of the screen of the navigation system 16 is continued, the shift position is determined again, and when the power feeding coil 9 is approaching (Yes in step S002), the power feeding coil 9 is approaching the vehicle body by the forward movement, so the monitor 17 Is switched to display an image taken by the underfloor camera 12 (step S004).

  On the other hand, if it is determined that the shift position is in reverse (Yes in step S001), the monitor display is switched to the image of the back view camera 11 (step S003), and it is determined whether or not the feeding coil 9 is approaching. (Step S004). If the feeding coil 9 is not approaching (No in step S004), the video of the back view camera 11 is displayed on the monitor 17 until approaching, and if the feeding coil 9 is approaching (Yes in step S004), The display on the monitor 17 is switched from the image of the back view camera 11 to the image of the underfloor camera 12 (step S005).

  Next, a deviation amount between the target mark 25 indicating the position of the power receiving coil 8 and the position of the power feeding coil 9 is calculated (step S006), and information on the deviation amount is displayed on the monitor 17 (step S007). If the amount of deviation is not less than the specified value (step S008), the process returns to the above-described deviation amount calculation (step S006) and repeats the above-described processing. On the other hand, when the amount of deviation is less than or equal to a preset specified value (Yes in step S008), an “OK” display on the monitor 17 indicates that the power receiving coil 8 and the power feeding coil 9 are properly arranged to face each other. The user is notified by voice output from a speaker or the like (step S009), and this series of control processing is temporarily terminated. In the flowchart of FIG. 5, the case where the monitor 17 is temporarily switched to the image of the back view camera 11 and then switched to the underfloor camera 12 when the electric vehicle 1 enters the parking area by reversing is described as an example. When the approach detection based on the video of the back view camera 11 is not performed, switching to the video of the back view camera 11 may be omitted.

  Therefore, according to the electric vehicle 1 of the first embodiment described above, when the power receiving coil 8 is disposed under the floor of the electric vehicle 1 and the approach detection means 20 detects the approach to the power feeding coil 9 on the ground, the monitor display By switching the image of the underfloor camera 12 to be displayed on the monitor 17 of the navigation system 16 by the information switching means 21, the electric vehicle 1 is arranged so that the power receiving coil 8 faces the power supply coil 9 while the user visually recognizes the image of the monitor 17. Can be guided by turning and reversing or moving forward, so that the arrangement of the power receiving coil 8 can be determined relatively freely if the arrangement of the power receiving coil 8 is under the floor of the electric vehicle 1. The degree can be improved.

  Furthermore, since the user can easily align the power receiving coil 8 and the power feeding coil 9 while visually recognizing the image on the monitor 17, the burden on the user can be reduced and the power receiving coil 8 and the power feeding coil 9 can be connected to each other. Since the alignment can be performed accurately, a decrease in charging efficiency can be prevented.

  Since the power receiving coil 8 and the power feeding coil 9 are arranged to face each other by matching the positions of the target mark 25 and the power feeding coil 9, which are virtual positions of the power receiving coil 8, on the monitor 17, more reliable alignment is achieved. It becomes possible, and the burden on the user can be further reduced.

  Further, since the amount of deviation is displayed on the screen of the monitor 17, the amount of deviation in the horizontal direction between the center position of the target mark 25 and the center position of the feeding coil 9 can be recognized as a numerical value. Accurate alignment can be performed.

  Next, an electric vehicle 1 according to a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the imaging range of the underfloor camera 12 and the back view camera 11 is optimized assuming that the vehicle always enters the parking area A while retreating. About the structure of the electric vehicle 1 in this 2nd Embodiment, the same code | symbol is attached | subjected to the same part as 1st Embodiment, using FIG. 2 of 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted (henceforth, below). The same applies to the third embodiment).

  As shown in FIG. 6, a receiving coil 8, a high voltage battery 6, and an underfloor camera 12 are installed under the floor of the electric vehicle 1. Further, a back view camera 11 is installed at the rear of the vehicle body of the electric vehicle 1, and a monitor 17 of the navigation system 16 is installed in the vehicle interior. The back view camera 11 is installed to face obliquely downward and rearward, and its photographing range (indicated by a chain line in FIG. 6) is a range from a substantially vertical lower side to a substantially horizontal rear side.

  The underfloor camera 12 is disposed on the vehicle front side substantially in the center of the power receiving coil 8 in the width direction, and is installed facing diagonally downward and rearward in the same manner as the back view camera 11. In addition, the shooting range of the underfloor camera 12 (indicated by a chain line in FIG. 6) is set from the lower front side of the power receiving coil 8 to the range that overlaps the front side of the shooting range of the back view camera 11 in the vehicle front-rear direction. Is done. That is, as shown in FIG. 7, when the electric vehicle 1 enters the parking area while retreating, the image of the power supply coil 9 is displayed immediately before the power supply coil 9 installed on the ground enters below the vehicle body. And the underfloor camera 12.

Next, control processing by the positioning ECU 15 of the second embodiment will be described with reference to the flowchart of FIG. Note that the same processes as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted (hereinafter, the flowchart of the third embodiment is also the same).
First, when the reverse position is detected by the shift position sensor 18 (Yes in step S001), the positioning ECU 15 (see FIG. 2) switches the monitor 17 to the image of the back view camera 11 (step S003). When the feeding coil 9 captured by the view camera 11 is detected by image processing and the approach of the feeding coil 9 to the vehicle body is detected by the approach detection means 20 (Yes in step S004), the monitor display information switching means 21 monitors 17 images are switched from the back view camera 11 to the underfloor camera 12 (step S005).

  Further, as in the first embodiment, the positioning ECU 15 displays a target mark 25 indicating a virtual position on the ground vertically below the power receiving coil 8 on the image of the underfloor camera 12 of the monitor 17 (see FIG. 7). Further, a current deviation amount between the center of the target mark 25 and the center of the feeding coil 9 is calculated (step S006) and displayed at the corner of the monitor 17 (step S007). As shown in FIG. When the center positions of the power supply coil 25 and the power supply coil 9 substantially coincide with each other and the amount of deviation is equal to or less than the specified value (Yes in step S008), the power reception coil 8 and the power supply coil are connected via the monitor 17 or the speaker of the navigation system 16. A notification output indicating that 9 is properly opposed is performed (step S009).

  Therefore, according to the electric vehicle 1 of the second embodiment described above, the back-view camera 11 and the underfloor camera 12 are arranged so that a part of the photographing range overlaps, and is thus photographed by the back-view camera 11. When the electric vehicle 1 is retreated while visually confirming the power supply coil 9 on the monitor 17 and the power supply coil 9 gradually approaches the electric vehicle 1 and comes out of the shooting area of the back view camera 11, the power supply coil 9 is Since it is within the shooting area of the underfloor camera 12, it is possible to smoothly prevent the user from losing sight of the feed coil 9 when the display on the monitor 17 is switched from the image of the back view camera 11 to the image of the underfloor camera 12. And the receiving coil 8 can be aligned.

  Next, the electric vehicle 1 of 3rd Embodiment of this invention is demonstrated, referring FIG. 10, FIG. In the third embodiment, a second underfloor camera 12b is added to the configuration of the second embodiment.

  As shown in FIGS. 10 and 11, in the electric vehicle 1 of the third embodiment, a power receiving coil 8 is installed under the floor at the rear of the vehicle. A first underfloor camera 12a and a second underfloor camera 12b are installed. Similar to the underfloor camera 12 of the second embodiment described above, the first underfloor camera 12a is installed on the front side of the power receiving coil 8 so as to face obliquely downward and rearward. The second underfloor camera 12b is installed at a position symmetrical to the power receiving coil 8 in the vehicle front-rear direction with respect to the first underfloor camera 12a so as to face obliquely downward and forward. That is, the shooting range of the second underfloor camera 12b is substantially symmetric with the first underfloor camera 12a in the vehicle front-rear direction. In addition, in the electric vehicle 1 of this embodiment, although the example which arrange | positions the receiving coil 8 under the floor of a vehicle rear part is shown, it is not restricted to this arrangement | positioning.

  The positioning ECU 15 detects the approach of the power feeding coil 9 by the approach detection means 20, and based on the detection result of the shift position sensor 18 at this time, the monitor 17 displays the video of the back view camera 11 when the shift is in the retracted position. When the shift is in the forward position (for example, “D”, etc.), the monitor 17 is switched from the normal navigation screen to the image of the second underfloor camera 12b. Here, when the electric vehicle 1 moves forward and approaches the power supply coil 9, the user can visually observe the power supply coil 9 through the front window glass, and therefore the video of the front view camera (not shown) is monitored 17. The control to display is not performed.

  The electric vehicle 1 according to the third embodiment has the above-described configuration. Next, the operation of the electric vehicle 1 will be described with reference to the flowchart of FIG.

  First, in a state where the screen of the normal navigation system 16 is displayed on the monitor 17, the search for the feeding coil 9 is started (step S101), and it is determined whether or not the feeding coil 9 is approaching the vehicle body (step S102). ).

If it is determined that the power supply coil 9 is not approached (No in step S102), the search for the power supply coil 9 is continued, and if it is determined that the power supply coil 9 is approached (Yes in step S102), the shift position sensor. Based on the detection result of 18, it is determined whether the direction in which the electric vehicle 1 enters the parking area is forward (step S103). If it is not an approach by advance (No in step S103), the electric vehicle 1 enters the parking area while retreating, so that the video of the first underfloor camera 12a is displayed on the monitor 17, while if it is an approach by advance ( In step S103, Yes), the video of the second underfloor camera 12b is displayed on the monitor 17.
And after performing the control process which concerns on the deviation | shift amount similar to step S006 to S009 of 1st Embodiment, this series of control processes are once complete | finished.

  Therefore, according to the electric vehicle 1 of the third embodiment described above, the traveling direction of the electric vehicle 1 is provided by providing the first underfloor camera 12a facing obliquely downward and the second underfloor camera 12b facing obliquely downward and forward, respectively. When the electric vehicle 1 approaches the power supply coil 9, the image of the power supply coil 9 can be quickly captured regardless of whether the electric vehicle 1 travels forward or backward. Can be displayed on the monitor 17.

  Next, an electric vehicle 100 according to a fourth embodiment of the present invention will be described with reference to the drawings. The electric vehicle 100 according to the fourth embodiment is provided with a so-called automatic parking assist system that automatically guides to the parking area by self-supporting in the configuration of the first embodiment described above, and the power receiving coil 8 and the power feeding described above. The positioning of the coil 9 is automated. Therefore, the same code | symbol is attached | subjected and demonstrated to the same part as the electric vehicle 1 of each embodiment mentioned above.

  FIG. 13 shows a schematic configuration of an electric vehicle 100 in the fourth embodiment. Similar to the first embodiment, the electric vehicle 100 includes a traveling motor 2, and the traveling motor 2 is connected to an inverter 5 that controls driving and power generation. The inverter 5 includes a bridge circuit formed by bridge connection using a plurality of switching elements such as IGBTs, and is controlled by pulse width modulation.

  The inverter 5 is connected to a high-voltage battery 6 that transmits and receives supply power supplied to the travel motor 2 during driving and output power output from the travel motor 2 during power generation by regenerative operation. The inverter 5 receives a control command from the EV_MGECU 37 that is an electronic control unit, and controls driving and power generation of the traveling motor 2. For example, when the traveling motor 2 is driven, the inverter 5 is based on a torque command output from the EV_MGECU 37. While the traveling motor 2 is driven and controlled by converting the DC power output from the motor into three-phase PWM output, the three-phase AC power output from the traveling motor 2 is converted into DC power when the traveling motor 2 generates power. The high voltage battery 6 is controlled to be charged.

  The high-voltage battery 6 is disposed under the rear seat or under the floor of the vehicle, and is connected to a power receiving unit (not shown) that charges the high-voltage battery 6 by converting the power generated in the power receiving coil 8 by electromagnetic induction. . On the other hand, similarly to the first embodiment, the power feeding coil 9 is installed on the ground of the predetermined parking area A, and the power receiving coil 8 and the power feeding coil 9 are appropriately arranged to face each other, so that an alternating current flows through the power feeding coil 9. AC current flows through the power receiving coil 8 by electromagnetic induction.

  The electric vehicle 1 includes an EPS motor 30 such as a DC brassless motor for assisting steering that constitutes an electric power steering device (hereinafter simply referred to as EPS), and pulse width modulation (PWM) for driving control of the EPS motor 30. ) And the like, an EPS_ECU 32 that controls the drive thereof, and a steering sensor 33 (STRG_SENS) for feedback control. The electric vehicle 1 can be steered by the driving of the EPS motor 30 without steering by the user.

  Further, a 12V battery 34, which is a low voltage battery, is connected to the EPS inverter 31, and a DC / DC converter that performs voltage conversion from a high voltage to a low voltage and from a low voltage to a high voltage between the 12V battery 34 and the high voltage battery 6, respectively. (D / V) 35 is interposed. The 12V battery 34 can be charged by the DC / DC converter 35 by voltage conversion from a high voltage system.

  The electric vehicle 100 further includes an automatic parking assist ECU 36 that constitutes an automatic parking assist system that automatically enters the parking area by reversing. The automatic parking assist system includes a plurality of cameras such as CCDs that photograph the surroundings of the electric vehicle 100 in order to detect the relative position of the vehicle with respect to a target in the parking area A, for example, a white line or a wall. Here, if there is no target around the parking area, such as a garage or garage at home, it can be preliminarily partitioned with a simple object such as a white line tape. It is preferable to input information such as the position of the coil 9.

  The plurality of cameras include a camera capable of photographing the front and the left and right of the vehicle body in addition to the back view camera 11 and the underfloor camera 12 described above, and photographing data thereof is input to the automatic parking assist ECU 36. The automatic parking assist ECU 36 outputs the input video of the underfloor camera 12 to the positioning ECU 15. Here, the underfloor camera 12 of the fourth embodiment has the same configuration as the underfloor camera 12 of the first embodiment or the second embodiment described above, and the width direction of the power receiving coil 8 installed under the floor of the electric vehicle 100. Adjacent to the vehicle front side at the approximate center. In the block diagram of FIG. 13, for the sake of illustration, only the underfloor camera 12 for photographing the underfloor of the vehicle body and the back view camera 11 for photographing the rear of the vehicle body are shown, and the other cameras are omitted.

  As in the first embodiment described above, the positioning ECU 15 is connected to the shift position sensor 18 and includes an approach detection means 20 and a monitor display information switching means 21. The positioning ECU 15 performs control for switching the monitor 17 of the navigation system 16 to the image of the underfloor camera 12 by the monitor display information switching means 21 when the approach detection means 20 detects the approach of the electric vehicle 100 when the electric vehicle 100 moves backward. . An ABS sensor (SENS) 40 is connected to the positioning ECU 15 via an ABS_ECU 39 that performs braking control of an ABS (anti-lock brake system), and information on the wheel speed of the host vehicle detected by the ABS sensor 40 is input. Then, this wheel speed information is output to the automatic parking assist ECU 36. In FIG. 13, the approach detection means 20 and the monitor display information switching means 21 are omitted for the sake of illustration.

  Further, the positioning ECU 15 calculates the amount of horizontal displacement between the center position of the power feeding coil 9 (target mark 25) and the center position of the power receiving coil 8 based on the image of the underfloor camera 12, and this amount of displacement is calculated. When the guidance request from the user is input from the positioning switch (SW) 38, information on the amount of deviation is output to the automatic parking assist ECU 36. .

  When the information on the amount of deviation is input from the positioning ECU 15, the automatic parking assist ECU 36 obtains a vehicle trajectory in which the amount of deviation is less than or equal to a predetermined amount of deviation set in advance, and the electric vehicle 100 along this trajectory. Is controlled to output to EV_MGECU 37 and EPS_ECU 32 so that the vehicle moves backward and stops, and motor driving and steering control of electric vehicle 100 are performed. Here, the automatic parking assist ECU 36 performs feedback control of the wheel speed and the steering angle based on the detection results of the steering sensor 33 and the ABS sensor 40 when the electric vehicle 100 is moving backward.

  The electric vehicle 100 according to the fourth embodiment has the above-described configuration. Next, control processing of the positioning ECU 15 using the automatic parking assist ECU 36 will be described with reference to the flowchart of FIG. 14 and FIG. Here, FIG. 15 is a diagram illustrating the movement of the electric vehicle 100 corresponding to the flowchart, and the control state of the electric vehicle 100 transitions in the order indicated by the arrows in the drawing. In the description of FIG. 15, each state of the electric vehicle 100 will be referred to as “upper left of FIG. 15, upper right of FIG. 15, middle left of FIG. 15, middle right of FIG. 15, lower left of FIG.

  First, as shown in the upper left of FIG. 15, the electric vehicle 100 enters the parking lot, and it is determined whether the electric vehicle 100 has stopped based on the wheel speed information detected by the ABS sensor 40 and the positioning switch 38 is operated. It is determined whether it has been performed (step S301 and step S302). When it is determined that the electric vehicle 100 is not stopped or the positioning switch 38 is not operated (No in Step S301 or No in Step S302), these determination processes are repeated, as shown in the upper right of FIG. When it is determined that the electric vehicle 100 is stopped and the positioning switch 38 is operated (Yes in Step S301 and Yes in Step S302), the parking position is recognized as the positioning condition (Step S304), Parking assist control is started (step S305), and as shown in the middle left of FIG. 15, the electric vehicle 100 along the track R so that the electric vehicle 100 fits into one parking area A defined by the white line in FIG. Is automatically retracted. Here, as positioning conditions for starting parking assist control, there is a parking area A behind the electric vehicle 100, and the longitudinal direction of the electric vehicle 100 is substantially perpendicular to the longitudinal direction of the parking area A. It is necessary to be.

  Next, it is determined whether or not the approach of the power feeding coil 9 to the electric vehicle 100 is detected (step S305). If the approach of the power feeding coil 9 is not detected, the parking assist control process is continued (in step S305). No) On the other hand, when the feeding coil 9 is present in the parking area A as shown in the right middle of FIG. 15 and the approach of the feeding coil 9 is detected, the positioning of the receiving coil 8 and the feeding coil 9 is determined. Starting (step S306), the display on the monitor 17 is switched to the image of the underfloor camera 12 as shown in the lower left of FIG.

  Then, similarly to step S006 of the first embodiment described above, a deviation amount between the target mark 25 indicating the position of the power receiving coil 8 and the position of the power feeding coil 9 is calculated (step S307), and the deviation amount is equal to or less than a specified value. It is determined whether or not (step S308). If the amount of deviation is not less than the specified value, the process returns to the calculation of the amount of deviation (step S307) and repeats the above-described processing, and when the amount of deviation is less than the specified value, as shown in the lower right of FIG. The electric vehicle 100 is stopped and a parking completion notification (OK display on the monitor 17 or the like) is performed (step S309).

  Therefore, according to the electric vehicle 100 of the fourth embodiment described above, the automatic parking assist ECU 36 can be operated simply by stopping the electric vehicle 100 and operating the positioning switch 38 so that the user satisfies the predetermined positioning condition in the parking lot. As a result, the electric motor 100 is moved and stopped so that the travel motor 2 and the EPS motor 30 are driven and controlled so that the arrangement of the power receiving coil 8 and the power feeding coil 9 is in the optimum position, thereby increasing the burden on the user. Without having to do so, it is possible to improve the charging efficiency and save energy.

The present invention is not limited to the configuration of each of the above-described embodiments, and the design can be changed without departing from the gist thereof.
For example, in each of the above-described embodiments, the case where non-contact charging is performed using the power receiving coil 8 and the power feeding coil 9 has been described, but power is transmitted using microwaves between the power transmitting electrode on the ground and the power receiving electrode under the vehicle floor. The present invention can also be applied to an electric vehicle that performs non-contact charging.

  In the first embodiment described above, the case where the target mark 25 is displayed on the screen of the monitor 17 has been described. However, the present invention is not limited to this configuration. For example, the target mark 25 may be omitted as shown in FIG. . Also in this case, the user can make the power receiving coil 8 and the power feeding coil 9 face each other by moving the electric vehicle 1 so that the power feeding coil 9 is located at the substantially center position of the monitor 17 while observing the amount of deviation. .

  Furthermore, as another example in the first embodiment and the second embodiment described above, the screen of the monitor 17 is divided, for example, as shown in FIG. 17, the image of the back view camera 11 and the image of the underfloor camera 12. May be displayed at the same time. With this configuration, when the shift position is in the backward position, the display area of the monitor 17 is divided, and the user can view the video of the back view camera 11 and the video of the underfloor camera 12 at the same time. Since the user can smoothly track the power feeding coil 9 captured in each image of the back view camera 11 and the underfloor camera 12, the power receiving coil 8 and the power feeding coil 9 can be positioned safely.

Furthermore, in the first embodiment and the second embodiment described above, the case where the underfloor camera 12 is disposed in the vicinity of the power receiving coil 8 has been described. However, as shown in FIG. May be.
In the first to fourth embodiments described above, the case where the shift amount is displayed as a numerical value on the monitor 17 has been described. However, the display is not limited to a numerical value as long as the display allows the user to recognize the shift amount. As shown in the figure, the amount of deviation may be displayed according to color shading or color change. FIG. 19 shows an example in which the closer the color is, that is, the smaller the amount of deviation becomes.
Further, a case will be described in which the approach detection means 20 is provided to automatically switch the display on the monitor 17 to the image of the underfloor camera 12 or the underfloor cameras 12a and 12b by the monitor display information switching means 21 when the approach of the feeding coil 9 is detected. However, when the switching operation means is provided, the approach detection means 20 may be omitted.

  Moreover, although the case where the automatic parking assist system is mounted in the electric vehicle 100 of the fourth embodiment has been described, the invention is not limited to the automatic parking assist system, and the driving motor 2 and the steering motor of the electric vehicle are operated without user operation. Even when a self-sustained traveling system that can move the vehicle by drive control is used, it is possible to automatically align the power receiving coil 8 and the power feeding coil 9 and charge the battery efficiently.

1,100 Electric vehicle 2 Traveling motor 6 High voltage battery (power storage device)
8 Power receiving coil (power receiving unit)
9 Feeding coil (feeding part)
DESCRIPTION OF SYMBOLS 11 Back view camera 12 Underfloor camera 12a 1st underfloor camera 12b 2nd underfloor camera 16 Navigation system 17 Monitor 20 Approach detection means 21 Monitor display information switching means 25 Target mark

Claims (11)

A traveling motor;
A power storage device that stores electric power supplied to the travel motor;
A power receiving unit arranged under the floor;
In a non-contact rechargeable electric vehicle including a navigation system that displays vehicle travel information on a monitor provided in a vehicle interior,
An underfloor camera that is provided near the power receiving unit or integrally with the power receiving unit and is installed facing the road surface under the floor;
An approach detection means for detecting the approach of the power feeding unit arranged on the road;
An electric vehicle comprising: monitor display information switching means for switching so that an image of the underfloor camera is displayed on the monitor when the approach detection means detects approach to the power feeding unit.   The electric vehicle according to claim 1, wherein the monitor displays a virtual position of the power reception unit.   The electric vehicle according to claim 2, wherein the monitor displays a shift amount from the virtual position to the power feeding unit. Provide a back view camera to capture the back of the vehicle,
The electric vehicle according to any one of claims 1 to 3, wherein at least a part of an image range captured by the back view camera and an image range captured by the underfloor camera overlap each other. .   The approach detecting means detects the approach of the power feeding unit when the video of the power feeding unit is not captured by the back view camera or when the video of the power feeding unit is captured by the underfloor camera. The electric vehicle according to claim 4.   5. The electric vehicle according to claim 4, wherein the monitor divides a display area and simultaneously displays the images of the back view camera and the underfloor camera when the shift position is in the backward position. A traveling motor;
A power storage device that stores electric power supplied to the travel motor;
A power receiving unit arranged under the floor;
In a non-contact rechargeable electric vehicle including a navigation system that displays vehicle travel information on a monitor provided in a vehicle interior,
Before SL power receiving portion provided integrally with, comprising a floor camera installed facing road surface direction in the floor,
The monitor is configured to display an image of the underfloor camera and to display the power receiving unit position on the monitor.   The electric vehicle according to claim 7, wherein the monitor displays a virtual position of the power receiving unit in the underfloor camera.   The electric vehicle according to claim 7 or 8, wherein the monitor displays a shift amount in a horizontal direction between the power receiving unit and a power feeding unit arranged on the road. An approach detection means for detecting the approach of the power feeding unit arranged on the road;
The monitor display information switching means for switching to display the video of the underfloor camera on the monitor when the approach detection means detects the approach to the power supply unit. The electric vehicle according to claim 1.   The electric vehicle according to any one of claims 7 to 10, further comprising switching operation means for switching the display on the monitor to an image of the underfloor camera.

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