Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide a stereo parking garage, comprising:
the parking system comprises a frame, a parking layer and a parking space, wherein the frame comprises a plurality of parking layers, and a plurality of parking spaces are arranged in the parking layers; an inlet and an outlet are arranged on the side surface of one parking layer, and the parking layer is an inlet and outlet layer;
the first vehicle carrying plates are arranged in the frame and used for carrying vehicles lower than a first preset height limit;
the second vehicle carrying plates are arranged in the frame and used for carrying vehicles lower than a second preset height limit, and the first preset height limit is lower than the second preset height limit;
a detection unit comprising
A confirmation detection component for confirming the number of a parking space into which a vehicle entering from the entrance/exit is to be driven;
an entrance detection assembly for determining whether the height of the vehicle exceeds the first preset limit height;
the prompting unit is used for issuing optical signals and/or sound signals; and
the control unit is connected with the detection unit and the prompt unit and used for obtaining the types of the vehicle carrying plates on the parking spaces according to the serial numbers of the parking spaces after the confirmation detection assembly confirms the serial numbers of the parking spaces to which the vehicles are going to enter, confirming whether the vehicles exceed the first preset limit height through the entrance detection assembly, and controlling the prompt unit to issue the ultrahigh prompt information to prompt the driver to drive the vehicles out when the vehicle carrying plates are the first vehicle carrying plates and the heights of the vehicles exceed the first preset limit height.
According to an embodiment of the present invention, the detection unit further includes an entry detection component for detecting whether a vehicle is entering from the entrance/exit;
the control unit is also used for issuing warehousing reminding information through the prompting unit to guide the vehicles to be warehoused when the entering detection assembly detects that the vehicles enter from the inlet and the outlet.
According to one embodiment of the invention, the entry detection assembly comprises
A first emission type photosensor including a first emitter and a first receiver respectively disposed at both sides of an entrance and an exit, the first emitter for continuously emitting a first light beam to the first receiver;
the second opposite-emission photoelectric sensor comprises a second emitter and a second receiver which are respectively arranged at two sides of the inlet and the outlet, and the second emitter is used for continuously emitting a second light beam to the second receiver;
the first light beam and the second light beam are parallel to each other and have the same height, the first light beam is arranged on the outer side of the inlet and the outlet, the second light beam is arranged on the inner side of the inlet and the outlet, and the control unit issues the warehousing reminding information when the second opposite-emission photoelectric sensor is triggered again during the period that the first opposite-emission photoelectric sensor is continuously triggered.
According to one embodiment of the invention, the confirmation detection assembly includes a plurality of specularly reflective optoelectronic switches disposed at the top of the access opening;
the mirror reflection type photoelectric switches are arranged in the parking spaces in the entrance and exit layer in a one-to-one correspondence mode, and each mirror reflection type photoelectric switch is aligned to the middle of the corresponding parking space;
mirror surface parts are arranged at one ends of the first vehicle carrying plate and the second vehicle carrying plate close to the inlet and the outlet, and inclined mirror surfaces are arranged on the mirror surface parts;
when any one of the first vehicle carrying board and the second vehicle carrying board is positioned on a parking space beside an entrance and exit, the mirror surface of the mirror surface part faces to the mirror surface reflection type photoelectric switch aligned with the parking space, the mirror surface reflection type photoelectric switch is used for continuously emitting a third light beam to the mirror surface, the third light beam can be reflected back to the mirror surface reflection type photoelectric switch by the mirror surface, the mirror surface reflection type photoelectric switch is triggered to send a third trigger signal to the control unit, and the control unit obtains the serial number of the parking space into which the vehicle is driving according to the received third trigger signal and starts the entrance detection assembly for detection.
According to an embodiment of the present invention, the entrance detection assembly includes a third correlation type photosensor including a third emitter and a third receiver respectively disposed at both sides of the entrance and the exit;
the height of the third transmitter is the same as that of the third receiver, the third transmitter is used for continuously transmitting a fourth light beam to the third receiver, the height of the position of the fourth light beam from the bottom surface of the access layer is equal to the first preset height limit, and when the third correlation type photoelectric sensor is triggered, the height of the vehicle is indicated to exceed the first preset height limit.
According to one embodiment of the invention, the entrance detection assembly is further configured to determine whether the height of the vehicle exceeds the second preset limit height;
and when the vehicle carrying plate is a second vehicle carrying plate and the height of the vehicle exceeds the second preset limit height, the prompting unit is controlled to issue ultrahigh prompting information to prompt a driver to drive the vehicle out.
According to an embodiment of the present invention, the entrance detection assembly further includes a fourth correlation type photosensor including a fourth emitter and a fourth receiver respectively disposed at both sides of the entrance and the exit;
the height of the fourth transmitter is the same as that of the fourth receiver, the fourth transmitter is used for continuously transmitting a fifth light beam to the fourth receiver, the height from the position where the fifth light beam is located to the bottom surface of the access layer is equal to the second preset height limit, and when the fourth correlation type photoelectric sensor is triggered, the height of the vehicle is indicated to exceed the second preset height limit.
According to one embodiment of the invention, the detection unit further comprises a plurality of protection detection components, and the protection detection components are arranged in one-to-one correspondence with the parking layers;
the protection detection assembly comprises a fifth correlation type photoelectric sensor, and the fifth correlation type photoelectric sensor comprises a fifth emitter and a fifth receiver which are respectively arranged at two ends of the parking layer;
the heights of the fifth transmitter and the fifth receiver are the same, the fifth transmitter is used for continuously transmitting a sixth light beam to the fifth receiver, the height of the position where the sixth light beam is located from the bottom surface of the corresponding parking layer is equal to the limit height of the corresponding parking layer, and when the fifth correlation type photoelectric sensor is triggered, the vehicle is indicated to have the danger of interference with the top of the parking layer.
According to one embodiment of the invention, each protection detection assembly has at least two fifth correlation type photosensors, and sixth light beams emitted by the two fifth correlation type photosensors intersect in the middle of their corresponding parking levels.
According to one embodiment of the invention, a plurality of said parking levels are stacked one above the other in a vertical direction.
According to one embodiment of the invention, the prompting unit comprises a plurality of prompting components, and each prompting component is correspondingly arranged behind each parking space of the access floor;
each cueing assembly comprises a display screen and a speaker.
According to the technical scheme, the three-dimensional parking garage has the advantages and positive effects that:
when a vehicle enters the garage from an entrance or an exit, the control unit can judge whether the height of the vehicle exceeds the limit height of the vehicle carrying plate which the vehicle is driving into, if so, the control unit can remind a driver of driving the vehicle out of the vehicle carrying plate by issuing ultrahigh reminding information, so that the situation that the vehicle with higher height is extruded or the three-dimensional parking garage is jammed due to the fact that the vehicle enters the first vehicle carrying plate which is used for storing the parking spaces of low vehicles is avoided.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Fig. 1 to 4 are schematic structural views of a stereo parking garage in this embodiment. The stereo garage can be a transverse moving stereo garage. The three-dimensional parking garage comprises a framework 1, a plurality of first vehicle carrying plates 2, a plurality of second vehicle carrying plates 3, a transverse moving mechanism (not shown in the figure), a lifting mechanism 7, a detection unit 6 (refer to fig. 5), a prompt unit 4 and a control unit 5.
Referring to fig. 1 and 2, the frame 1 includes a plurality of vertical columns 11, a plurality of cross beams 13, and a plurality of longitudinal beams 12. The vertical posts 11 are arranged vertically. Crossbeam 13 and longeron 12 mutually perpendicular, and all set up horizontally. The two cross beams 13 and the two longitudinal beams 12 can form a rectangular frame. A plurality of rectangular frames are arranged in the vertical direction. In the present embodiment, two rectangular frames are provided. The vertical upright posts 11 are at least provided with 4, and the 4 vertical upright posts 11 are respectively connected with one corner of each rectangular frame and support each rectangular frame.
Be provided with the multilayer parking layer in the frame 1, a plurality of parking layers are vertical to be stacked up in proper order. A plurality of parking spaces are transversely arranged in each parking layer. The parking level near the top has a height less than the height of the parking level near the bottom, so that the parking level near the top can only park cars of a shorter height, and the parking level near the bottom can park cars of a higher height.
The first vehicle carrying plate 2 and the second vehicle carrying plate 3 can be both arranged in a flat plate shape. The first vehicle carrying plate 2 and the second vehicle carrying plate 3 can carry vehicles with different heights. The first vehicle carrying plate 2 is used for carrying vehicles lower than a first preset height limit, and the second vehicle carrying plate 3 is used for carrying vehicles lower than a second preset height limit. The first predetermined height limit is less than the second predetermined height limit. When the vehicle is parked, each first vehicle carrying plate 2 and each second vehicle carrying plate 3 occupy a parking space. The parking position of the first vehicle carrying plate 2 is a parking space of a parking layer with a lower layer height, namely the parking space of the parking layer close to the top exists on the first vehicle carrying plate 2 when the vehicles are stored; the parking position of the second car carrying plate 3 is the parking position of the parking layer with higher layer height, namely the parking position of the parking layer close to the bottom of the second car carrying plate 3 exists when the cars are stored. The height of the parking space where the first vehicle carrying plate 2 is located when the vehicles are stored is smaller than that of the parking space where the second vehicle carrying plate 3 is located when the vehicles are stored.
In this way, the maximum height of the vehicle that can be carried by the first vehicle carrying board 2 is less than the maximum height of the vehicle that can be carried by the second vehicle carrying board 3. For example, the first vehicle carrier 2 can carry at most a car, while the second vehicle carrier 3 can carry an off-road vehicle or an SUV (sport utility vehicle) in addition to a car.
The lifting mechanism 7 can vertically move the first car carrying plate 2 and the second car carrying plate 3, so that the first car carrying plate 2 and the second car carrying plate 3 can change a parking layer. The transverse moving mechanism can transversely move the first car carrying plate 2 and the second car carrying plate 3, so that the first car carrying plate 2 and the second car carrying plate 3 can be translated in a parking layer where the first car carrying plate and the second car carrying plate are located to replace parking spaces. The lifting mechanism 7 and the traversing mechanism are prior art and will not be described in detail herein.
The control unit 5 is a logic control unit 5, and can be a single chip microcomputer, a computer or a PLC controller. The control unit 5 is connected to the lifting mechanism 7 and the traversing mechanism. The control unit 5 is used to control the traversing mechanism and the lifting mechanism 7 to achieve access to the vehicle. The parking layer, which is usually the lowest layer, is provided with an entrance/exit 10, and vehicles enter and exit the three-dimensional parking garage through the entrance/exit 10. When parking is carried out, the logic control unit 5 controls the transverse moving mechanism and/or the lifting mechanism 7 to move the empty first car carrying plate 2 and the empty second car carrying plate 3 to the parking space of the bottommost parking layer, and controls the transverse moving mechanism and/or the lifting mechanism 7 to move the first car carrying plate 2 or the empty second car carrying plate 3 to the designated empty parking space after the vehicle enters the first car carrying plate 2 or the second car carrying plate 3. And the process of taking the vehicle is opposite, the control unit 5 controls the transverse moving mechanism and/or the lifting mechanism 7 to move the first vehicle carrying plate 2 or the second vehicle carrying plate 3 carrying the specified vehicle to the parking space of the bottommost parking layer, and then waits for the driver to drive the vehicle out from the inlet/outlet 10.
The prompting unit 4 can emit light and sound signals to prompt the driver. The prompting unit 4 includes a plurality of prompting components 41, and each prompting component 41 is connected to the control unit 5. The reminder assembly 41 includes a display screen and a speaker. The display screen may be an LED display screen. Each prompting component 41 is correspondingly arranged behind each parking space of the bottommost parking layer.
The detection unit 6 is connected to the control unit 5. The detection unit 6 is used for detecting whether the vehicle is ultrahigh. The detection unit 6 includes an entry detection assembly 61. Entry detection assembly 61 is used to detect whether a vehicle is entering the stereo garage from entrance/exit 10.
Referring to fig. 2 and 3, the entry detection assembly 61 includes a first opposite-type photosensor 611, a second opposite-type photosensor 612, a first mounting bracket 613, and a second mounting bracket 614. The first mounting bracket 613 and the second mounting bracket 614 are respectively disposed at opposite sides of the access opening 10. The first mounting bracket 613 and the second mounting bracket 614 may be fixed to the upright posts 11 at both sides of the port 10, respectively. The first mounting bracket 613 and the second mounting bracket 614 may each be a cross bar extending in a direction parallel to the vehicle entry-and-exit direction. The first mounting bracket 613 and the second mounting bracket 614 have the same height, and may have the same height as a bumper of a vehicle.
The first opposite emission type photosensor 611 includes a first emitter 615 and a first receiver 616. The first emitter 615 and the first receiver 616 are respectively disposed on an outer end of the first mounting bracket 613 and an outer end of the second mounting bracket 614, and the first emitter 615 and the first receiver 616 are at the same height. The first emitter 615 continuously emits a first light beam to the first receiver 616. The first receiver 616 continuously sends the first trigger signal to the control unit 5 when there is an obstruction of the opaque item between the first emitter 615 and the first receiver 616.
The second opposite-type photosensor 612 includes a second transmitter 618 and a second receiver 617. A second transmitter 618 and a second receiver 617 are respectively disposed at an end of the first mounting bracket 613 and an end of the second mounting bracket 614, and the second transmitter 618 and the second receiver 617 are at the same height. The second transmitter 618 continuously transmits a second light beam to the second receiver 617. The second receiver 617 continues to transmit the second trigger signal to the control unit 5 when there is an obstruction of the light-tight article between the second transmitter 618 and the second receiver 617.
The first light beam emitted by the first emitter 615, which is arranged inside the frame 1, and the second light beam emitted by the second emitter 618, which is arranged outside the frame 1, are parallel to each other and have the same height. The distance between the first light beam and the second light beam is greater than or equal to a preset distance. The preset distance is larger than the shoulder width of a common human body. The preset distance may be 0.5 meters. Thus, when the vehicle enters the garage, the vehicle sequentially blocks the first light beam and the second light beam, and the control unit 5 can sequentially receive the first trigger signal and the second trigger signal.
When the control unit 5 receives the second trigger signal while continuously receiving the first trigger signal, it issues a warehousing reminding message to the prompt unit 4. The manner of sending the warehousing reminding information by the control unit 5 may be to display the text information of "please pour in" or "please advance" on the display screen, and to broadcast the corresponding voice of "please pour in" or "please advance" through the speaker.
When the control unit 5 receives the second trigger signal again during the period of continuously receiving the first trigger signal, it indicates that the vehicle blocks the first light beam and the second light beam in sequence, and the vehicle enters the garage. Meanwhile, the second light beam is blocked when the first light beam is continuously blocked, the fact that the width of the object blocking the light is larger than the preset distance is indicated, and the fact that people enter the three-dimensional parking garage can be eliminated.
Referring to fig. 5, the detection unit 6 further includes a confirmation detection component 62. The confirmation detecting module 62 is used to confirm the number of the parking space into which the vehicle entering from the entrance/exit 10 is going to enter. Referring to FIG. 3, the confirmation detection assembly 62 includes a plurality of specularly reflective photoelectric switches 621. A plurality of the specularly reflective photoelectric switches 621 are disposed above the access opening 10, and the plurality of the specularly reflective photoelectric switches 621 may be fixed on the beam 13 above the access opening. The specularly reflective photoelectric switches 621 are disposed in one-to-one correspondence with parking spaces in the bottommost parking level. In the vehicle entrance/exit direction, each of the specularly reflective photoelectric switches 621 is aligned with the middle position of the parking space corresponding thereto.
Mirror portions 622 are arranged on the first vehicle carrying plate 2 and the second vehicle carrying plate 3. The mirror surface portions 622 are both arranged at the middle positions of the first vehicle carrying board 2 and the second vehicle carrying board 3 near the one ends of the doorway. The mirror surface portion 622 includes an inclined mirror surface. And a mirror reflection type photoelectric switch 621 in which a mirror surface of the mirror surface portion 622 is aligned toward a parking space when the first vehicle carrying board 2 and the second vehicle carrying board 3 are located at the bottommost parking space and waiting for a vehicle to enter. The specularly reflective photoelectric switch 621 sends the third light beam toward the mirror, which can reflect the third light beam back to the specularly reflective photoelectric switch 621. The specularly reflective photoelectric switch 621 sends a third trigger signal to the control unit 5 when the third light beam is blocked.
In the control unit 5, each of the specularly reflective photoelectric switches 621 is previously associated with one of the lowermost parking spaces. It is possible to establish a list in the control unit 5 in which the number of each of the specularly reflective photoelectric switches 621 corresponds to the number of each parking space of the lowermost layer. After receiving a third trigger signal sent by one specular reflection type photoelectric switch 621, the control unit 5 can know that a vehicle enters a parking space corresponding to the specular reflection type photoelectric switch 621.
Referring to fig. 1 and 3, the detection unit 6 further comprises an entrance detection assembly 63 for determining whether the height of the vehicle exceeds a first preset limit and for determining whether the height of the vehicle exceeds a second preset limit. The entrance detection assembly 63 is connected to the control unit 5. The entrance detection assembly 63 includes a third correlation type photosensor 631 and a fourth correlation type photosensor 632. The third correlation photoelectric sensor 631 is configured to measure whether the vehicle exceeds a first preset height limit corresponding to the first vehicle loading board 2. The fourth correlation type photoelectric sensor 632 is configured to measure whether the vehicle exceeds a second preset height limit corresponding to the second vehicle carrying board 3.
The third correlation type photosensor 631 includes a third emitter 633 and a third receiver 634. The third emitter 633 and the third receiver 634 are respectively disposed on the upright posts 11 at both sides of the port 10, and the heights of the third emitter 633 and the third receiver 634 are the same. The third emitter 633 can emit a fourth light beam to the third receiver 634. The height from the position of the fourth light beam to the bottom surface of the access layer is equal to the first preset height limit. When there is four light beams blocked by the light-tight article between the third emitter 633 and the third receiver 634, the third receiver 634 continuously transmits the fourth trigger signal to the control unit 5.
The fourth correlation type photosensor 632 includes a fourth transmitter 635 and a fourth receiver 636. The fourth transmitter 635 and the fourth receiver 636 are respectively disposed on the upright posts 11 at both sides of the port 10, and the heights of the fourth transmitter 635 and the fourth receiver 636 are the same. The fourth transmitter 635 can transmit one fifth light beam to the fourth receiver 636. The height from the position of the fifth light beam to the bottom surface of the access layer is equal to a second preset limit height. When the fifth light beam is blocked by the opaque object between the fourth transmitter 635 and the fourth receiver 636, the fifth trigger signal is continuously transmitted from the fourth receiver 636 to the control unit 5.
After receiving the third trigger signal, the control unit 5 activates the entrance detection component 63 to detect whether the vehicle exceeds the first preset limit height and the second preset limit height. That is, when the check detecting unit 62 detects that the vehicle partially enters the lowest parking space, the control unit 5 triggers the third and fourth correlation photoelectric sensors 631 and 632 to measure the height of the vehicle.
The control unit 5 judges whether the height of the vehicle is matched with the type of the vehicle carrying plate or not through the following steps:
step S1: after receiving the third trigger signal sent by the specular reflection type photoelectric switch 621, the third correlation type photoelectric sensor 631 is enabled to measure the vehicle to determine whether the vehicle exceeds a first preset limit height, and the fourth correlation type photoelectric sensor 632 is enabled to measure the vehicle to determine whether the vehicle exceeds a second preset limit height;
in this step, after the third correlation type photosensor 631 is activated, the third transmitter 633 transmits the fourth light beam to the third receiver 634, and if the fourth light beam cannot reach the third receiver 634, the third receiver 634 transmits a fourth trigger signal to the control unit 5.
When the fourth opposite-type photosensor 632 is activated, the fourth transmitter 635 transmits the fifth light beam to the fourth receiver 636, and if the fifth light beam cannot reach the fourth receiver 636, the fourth receiver 636 transmits a fifth trigger signal to the control unit 5.
The control unit 5 determines whether the vehicle exceeds a first preset limit height by whether a fourth trigger signal is received or not, and determines whether the vehicle exceeds a second preset limit height by whether a fifth trigger signal is received or not.
Step S2: inquiring the number of the parking space corresponding to the mirror reflection type photoelectric switch 621 sending the third trigger signal, and inquiring the type of the vehicle carrying board stored in the parking space according to the number of the parking space;
in the control unit 5, a list in which the communication interface connected to each of the specular reflection type photoelectric switches 621 corresponds to the number of each of the specular reflection type photoelectric switches 621 is recorded in advance, and the control unit 5 may obtain the number of the specular reflection type photoelectric switch 621 according to which communication interface the third trigger signal is input from;
and then, the serial number of the parking space is inquired according to the serial number of the mirror reflection type photoelectric switch 621 to obtain whether the vehicle carrying board parked on the parking space is the first vehicle carrying board 2 or the second vehicle carrying board 3.
Step S3: when the vehicle carrying plate is the first vehicle carrying plate 2 and the vehicle is higher than the first preset height limit or the vehicle carrying plate is the second vehicle carrying plate 3 and the vehicle is higher than the second preset height limit, the control prompt unit 4 sends the ultrahigh reminding information.
The step S3 includes steps S31 to S34.
Step S31: judging whether the vehicle carrying board is the first vehicle carrying board 2, if so, entering the step S32, otherwise, entering the step S33;
step S32: judging whether the vehicle exceeds a first preset limit height, and if so, entering step S34;
step S33: judging whether the vehicle exceeds a second preset limit height, and if so, entering step S34;
step S34: the control prompt unit 4 issues the ultrahigh reminding information.
The prompt unit 4 issues the superelevation prompting information, which may be that "the vehicle is superelevated and please exit" is displayed through a display screen corresponding to the parking space where the vehicle is located, and "the vehicle is superelevated and please exit" is broadcasted through a speaker corresponding to the parking space where the vehicle is located.
By adopting the steps, the control unit 5 can judge whether the height of the vehicle exceeds the limit height of the vehicle carrying plate which the vehicle is driving into, and if the height of the vehicle exceeds the limit height of the vehicle carrying plate, the control unit reminds the driver to drive the vehicle out of the vehicle carrying plate by issuing the ultrahigh reminding information, so that the situation that the vehicle with higher height is extruded or the three-dimensional parking garage is jammed due to the fact that the vehicle with higher height enters the first vehicle carrying plate 2 which is used for being stored in the parking space of the low vehicle is avoided. Meanwhile, when the height of the vehicle is larger than the limit height of the second vehicle carrying plate 3, the vehicle cannot be stored in the stereo parking garage, and therefore the ultrahigh reminding information is issued to remind a driver of driving the vehicle out.
Referring to fig. 3 and 4, the detection unit 6 further includes a plurality of guard detection assemblies 64. Starting from the second parking level, each parking level is provided with a protective detection assembly 64. The protection detection component 64 is used for measuring whether the height of a vehicle on the parking layer exceeds the limit height of the parking layer. The guard detection assembly 64 includes a fifth correlation type photosensor 640, and the fifth correlation type photosensor 640 includes a fifth emitter 641 and a fifth receiver 642. The fifth receiver 642 is connected to the control unit 5.
The fifth transmitter 641 and the fifth receiver 642 are disposed at opposite ends of their corresponding parking levels, respectively. The fifth transmitter 641 and the fifth receiver 642 may be disposed on the two longitudinal beams 12 at the opposite ends of the parking level, respectively. The heights of the fifth transmitter 641 and the fifth receiver 642 are the same. The fifth transmitter 641 continuously transmits one sixth light beam to the fifth receiver 642. The height of the sixth beam from the bottom of the parking level is the limit height of the parking level beyond which a vehicle is likely to interfere with the top of the parking level. When there is an opaque object between the fifth emitter 641 and the fifth receiver 642 to block the sixth light beam, the fifth receiver 642 continuously transmits the sixth trigger signal to the control unit 5.
When the control unit 5 receives the sixth trigger signal, it immediately stops the operation of the power plant of the stereo garage, for example the lifting mechanism 7. This protection detection subassembly 64 can play the guard action when entry detection subassembly 63 is unusual ageing, avoids getting into the super high vehicle of stereo garage and is extruded.
Further, each guard detection assembly 64 includes two fifth correlation type photosensors 640, and the sixth light beams emitted by the two fifth correlation type photosensors 640 intersect at the middle of their corresponding parking levels.
Therefore, the measurement area can be maximized under the condition that the fifth correlation type photoelectric sensor 640 is used as little as possible, and the probability of missed detection is reduced.
Further, after confirming that the detection component 62 is triggered, the control unit 5 delays for 2 seconds to issue parking-in-place information through the prompting unit 4. The words "OK" may be displayed on the display screen and "parking in place" is announced by voice.
Although the present invention has been disclosed with reference to certain embodiments, numerous variations and modifications may be made to the described embodiments without departing from the scope and ambit of the present invention. It is to be understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the scope of the appended claims and their equivalents.