CN111540229A - Parking space information guidance control system - Google Patents

Abstract

A parking stall information guidance control system comprises a diffuse reflection infrared detection sensor, a signal acquisition processing module, a controller, a communication module and a data server; the diffuse reflection infrared detection sensor comprises a luminous body and a light receptor, and the luminous body and the light receptor are respectively connected to the signal acquisition processing module; the signal acquisition processing module is connected with the controller, and the controller is connected with the data server through the communication module; the diffuse reflection infrared detection sensors are arranged at four different positions of the parking space, and the luminous bodies emit light upwards; the controller judges the parking space state according to the on-off states of the four diffuse reflection infrared detection sensors collected by the signal collection processing module, the collected parking space state data are uploaded to the data server through the communication module, and the data server transmits the parking space state to the user terminal to guide the vehicle to park in a standard mode. The system realizes real-time detection of whether the motor vehicle is normally parked, and has the advantages of high detection speed, high accuracy and stable performance.

Description

Parking Information Guidance Control System

technical field

The invention relates to a system for regulated parking of vehicles in parking spaces in a parking lot, and belongs to the technical field of vehicle control in parking spaces.

Background technique

Under normal circumstances, the length and width of the parking space in the residential parking lot are 5.0 meters x 2.6 meters, which are suitable for parking vehicles with a length of 4.9 meters and a width of less than 2.0 meters. The standardized parking should make the vehicle as a whole in the parking space. beyond the border.

The traditional parking space navigation only uses GPS/Beidou to navigate to the parking lot location, then blindly enters the parking lot, and manually finds the parking space within the visual distance. In this case, if the parking lot is relatively small, it is easier to find a parking space. If the parking lot is relatively large, and there are multiple floors or multiple underground distributions, it is more difficult to find a parking space. The traditional parking space detection uses wireless geomagnetic technology or ultrasonic technology, which can only detect whether the motor vehicle is parked in the parking space, and cannot judge whether the motor vehicle is parked in a standard and in place.

CN110861581A discloses a system and method for detecting the parking posture of a bus, comprising: two sets of ultrasonic sensors, the two sets of ultrasonic sensors are respectively installed on the body body adjacent to the front and rear wheels on the parking side of the vehicle; an early warning module, when it is determined that the vehicle is parked When the attitude is unqualified, it will give an early warning prompt; the ECU module is used to judge the vehicle's entering state according to the vehicle state information. When parking, open the detection, calculate the distance information between the front and rear wheels of the vehicle and the curb of the platform respectively, and judge the parking posture of the bus according to the distance information, and determine whether the difference between the distances between the front and rear wheels of the vehicle and the curb of the platform exceeds the set value. If it exceeds the set threshold, it is determined that the parking posture of the vehicle is unqualified. However, the system and method only use ultrasonic sensors to detect large buses with a relatively wide parking area, and the judgment of the parking posture of the buses is also relatively broad, so it is not suitable for small cars in the parking lot with dense parking spaces. probe.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a parking space information induction control system capable of detecting and judging whether a motor vehicle is in a parking space or not, with fast detection speed, high accuracy and stable performance.

The parking garage information induction control system of the present invention adopts the following technical solutions.

The system includes a diffuse reflection infrared detection sensor, a signal acquisition and processing module, a controller, a communication module and a data server; the diffuse reflection infrared detection sensor includes a light-emitting body and a light-receiving body, and the light-emitting body and the light-receiving body are respectively connected to the signal collection and processing module; The signal acquisition and processing module is connected to the controller, and the controller is connected to the data server through the communication module; the diffuse reflection infrared detection sensors are arranged in four different positions of the parking space and the luminous bodies are upward to emit light;

The controller judges the parking space status according to the switch status of the four diffuse reflection infrared detection sensors collected by the signal acquisition and processing module, and uploads it to the data server through the communication module. Vehicles are parked according to regulations.

The infrared beam emitted by the light-emitting body is modulated by frequency, and the modulation frequency is generally 35KHz, and the light-receiving body implements corresponding frequency detection.

After the light receiver receives the infrared beam signal reflected by the light source (the light beam emitted by the light source is blocked by the vehicle), the parking space status signal output by the acquisition and processing module is "0". If the light receiver does not receive the reflected infrared light beam from the light source, Then the parking space status signal output by the signal acquisition and processing module is "1".

The length and width of the parking space are 5.0 meters and 2.6 meters respectively, and two diffuse reflection infrared detection sensors in four different positions are on the center line between the two width boundaries of the parking space and 90 cm away from the nearest width boundary. , the other two diffuse reflection infrared detection sensors are on the center line between the two length boundaries of the parking space and 100 cm away from the nearest length boundary. It is suitable for standard parking of vehicles with a length of 4m-4.9m and a width of 1.7m-2.0m.

The controller adopts a single-chip microcomputer, which is used for outputting the inducing information of the use state of the parking space.

The communication module adopts a 4G wireless communication module.

The signal acquisition and processing module includes a modulation circuit, a carrier frequency circuit, a demodulation circuit, a frequency division circuit and a decoding circuit; the modulation circuit and the carrier frequency circuit are used to modulate the infrared light emitted by the illuminant, and the demodulation circuit, frequency division circuit The circuit and the decoding circuit are used for frequency demodulation and detection; the modulation circuit superimposes the parking space signal on the carrier frequency circuit, and the parking space signal and the carrier frequency signal are superimposed to form a mixed signal with long transmission distance and strong anti-interference ability; the light receiver receives the modulated infrared The optical signal goes through the demodulation circuit, the frequency dividing circuit and the decoding circuit to switch on the light state.

The controller judges the parking space state according to the received parking space state signal output by the signal acquisition and processing module. It is idle, and in other cases (both "0" and "1"), it is irregular parking.

The invention realizes the real-time detection of whether the motor vehicle is parked in a standard manner by emitting infrared light upwards and modulating the light-emitting body, and receiving the reflected infrared light through the light-receiving body to judge the presence or absence of the vehicle and the parking state, with fast detection speed and accuracy. High, stable and reliable performance, low price.

Description of drawings

FIG. 1 is a schematic diagram of the structural principle of the parking space information induction control system in the present invention.

FIG. 2 is a schematic diagram of the arrangement position of the diffuse reflection infrared detection sensors in the parking space.

FIG. 3 is a circuit schematic diagram of a parking space detection diffuse reflection infrared sensor and a signal acquisition and processing module in the present invention.

FIG. 4 is a schematic diagram of infrared light emitted by a light-emitting body and received by a light-receiving body in a diffuse reflection infrared detection sensor.

FIG. 5 is a flow chart of the parking space detection control process in the present invention.

FIG. 6 is a schematic diagram of a parking space information collection and induction process in the present invention.

FIG. 7 is a schematic diagram of the expansion of the parking space information collection terminal in the present invention.

In the figure: 1. Diffuse reflection infrared detection sensor; 2. Signal acquisition and processing module; 3. Controller; 4. Communication module; 5. Data server; 6. Light-emitting body; 7. Light-receiving body; 8. Demodulation circuit; 9 . Carrier frequency circuit; 10. Modulation circuit; 11. Frequency division circuit; 12. Decoding circuit.

Detailed ways

As shown in FIG. 1 , the structure of the parking garage information induction control system of the present invention includes a diffuse reflection infrared detection sensor 1 , a signal acquisition and processing module 2 , a controller 3 , a communication module 4 and a data server 5 , which are connected in sequence. The controller 3 adopts a single-chip microcomputer, which is used to output the parking space state induction information. The communication module 4 adopts a 4G wireless communication module.

The above system is suitable for underground or above-ground parking lots in residential quarters, and vehicles with a length of 4 meters to 4.9 meters and a width of 1.7 meters to 2.0 meters are parked according to regulations. As shown in Figure 2, the length and width of the parking space are 5.0 meters and 2.6 meters respectively, and four diffuse reflection infrared detection sensors 1 are set at different positions in the parking space. Two diffuse reflection infrared detection sensors are arranged on the center line between the two width boundaries of the parking space, and the diffuse reflection infrared detection sensor is 90 cm away from the nearest width boundary, on the center line between the two length boundaries of the parking space Two diffuse reflection infrared detection sensors are set, and the diffuse reflection infrared detection sensors are 100 cm away from the nearest length boundary. Therefore, it is determined that the length and width of the vehicle do not exceed 4.9 meters and 2.0 meters, respectively, and are not less than 4 meters and 1.7 meters (minimum vehicle length: 5.0 meters - 1.0 meters = 4.0 meters, minimum vehicle width: 2.6 meters - 0.9 meters = 1.7 meters ).

As shown in Figure 3, the connection circuit between the diffuse reflection infrared detection sensor 1 and the signal acquisition and processing module 2, the signal acquisition and processing module 2 includes a demodulation circuit 8, a carrier frequency circuit 9, a modulation circuit 10, a frequency division circuit 11 and a decoding circuit 12. The demodulation circuit 8 is IC3, the carrier frequency circuit 9 is IC2, the modulation circuit 10 is IC1, the frequency dividing circuit 11 is IC4, and the decoding circuit 12 is IC5.

The diffuse reflection infrared detection sensor 1 adopts an infrared photoelectric switch, including a light-emitting body 6 (infrared light-emitting diode) and a light-receiving body 7 (infrared receiving diode). with or without. The light-emitting body 6 continuously emits modulated infrared light, the light-receiving body 7 receives the infrared light signal, and the light-emitting body 6 and the light-receiving body 7 are respectively connected to the signal acquisition and processing module 2 in two ways.

As shown in FIG. 4 , the light-emitting body 6 of the diffuse reflection infrared detection sensor 1 emits light upward, and the light-receiving body 7 receives the infrared light emitted by the light-emitting body 6 and reflected back after being blocked by the vehicle (the effective emission distance of the infrared light emitted by the light-emitting body 6 is is 100 cm). The output of the signal acquisition and processing module 2 is 0 when there is a vehicle blocking between the light-emitting body 6 and the light-receiving body 7 , and 1 otherwise.

In order to enable the light receiver 7 of the diffuse reflection infrared detection sensor 1 to distinguish the effective infrared signal from the infrared radiation in the background environment, so as to provide a detection range with good effect, the infrared beam emitted by the light-emitting body 6 is modulated by the modulation circuit 10, The receiving part of the light receiver 7 is demodulated, divided and decoded by the corresponding demodulation circuit 8 , frequency division circuit 11 and decoding circuit 12 . The infrared beam emitted by the light emitting body 6 can be modulated using a continuous tone signal or a single tone pulse frequency modulation signal. The infrared modulation frequency is generally 35KHz, and the interference signal beyond 35KH will be filtered, making the detection more accurate and reliable. The modulation of the infrared beam can suppress the inherent noise of the modulation circuit, the carrier frequency circuit and other links in the signal acquisition process and the interference of the external electromagnetic field, and has a higher detection ability.

The modulation circuit 10 and the carrier frequency circuit 9 are used for modulating the infrared light emitted by the light-emitting body 6, and the demodulation circuit 8, the frequency dividing circuit 11 and the decoding circuit 12 are used for frequency demodulation and detection.

The modulation circuit 10 superimposes the detection signal of the diffuse reflection infrared detection sensor 1 on the carrier frequency circuit 9, and the detection signal and the carrier frequency signal are superimposed to form a mixed signal with long transmission distance and strong anti-interference ability. The light receiver 7 receives the diffuse reflection infrared light signal, and performs state conversion through the demodulation circuit 8 , the frequency dividing circuit 11 and the decoding circuit 12 .

The infrared light emission circuit of the diffuse reflection infrared detection sensor 1 is composed of two 555 time base circuits, which generate 1.5KHz modulation pulses and 35KHz carrier frequency pulses respectively. A 1.5KHZ modulated pulse oscillator is composed of modulation circuit 10 (IC1), R9, R13 and D5, of which D5 is used to adjust the duty cycle of the pulse cycle. When C19 is charging, D5 is forward biased, and the charging current direction is: Power→R9→D5→C19, charging time constant T1≈R9C19, D5 is reverse biased when C19 is discharging, the discharge current direction is: C19→R13→7 pin→ground, and the discharging time constant T2=R13C19. R13≈3R9, so an output pulse with a duty cycle of about 1:15 is obtained.

The 35KHZ ground carrier frequency pulse oscillator is composed of modulation circuit 9 (IC2), R11, R12 and C18. The oscillator is controlled by IC1. When the 3-pin of IC1 is at a high level, IC2 oscillates and outputs a 35kHZ carrier frequency pulse. When pin 3 is low, IC2 stops vibrating and has no output. When IC2 oscillates, its output turns on and off the transistor VT1 at a frequency of 35KHZ, and drives the infrared light-emitting tube HD1 to send out infrared control pulse signals. Resistor R14 limits the driving current of the two infrared light-emitting tubes (light-emitting body 6) to about 1A. Since the duty ratio of the transmitted carrier frequency pulse is 1:15, the average current consumption of this circuit is still small.

IC3 is an infrared receiving preamplifier circuit μPC1373H, which adjusts the receiving frequency to 35KHZ and outputs a modulated signal of 1.5KHZ from pin 1 after internal amplification and detection. IC4 is a bistable flip-flop composed of double D flip-flops 4013. The flip-flop is used as a frequency divider. For each input of two pulses, 1 pin outputs one pulse. After IC4 divides the modulation signal of 1.5KHZ, a pulse signal of 750HZ is obtained. It is limited by D8 and D9, and coupled to IC5 audio decoder LM567 through C27. When the input terminal 3 of LM567 inputs the audio signal of 750HZ, its output terminal 8 outputs a low level, through C26, The C30 extends the output pulse width to about 1.5 seconds. That is, the low level makes the drive transistor VT2 turn on, so that it outputs a high level.

The signal acquisition and processing module 2 transmits the processed signal to the controller 3, and the controller 3 judges the parking space state according to the switch states of the diffuse reflection infrared detection sensors 1 vertically arranged in four different positions of the parking space, and 0000 is the standard parking (four). The light-emitting body of the diffuse reflection infrared detection sensor is completely blocked by the vehicle, and the light-receiving body receives the reflected light of the light-emitting body). Other states are irregular parking (the illuminants of the four diffuse reflection infrared detection sensors are partially blocked by the vehicle). As shown in FIG. 3 , the specific operation process of the controller 3 is as follows.

As shown in Figure 5: After power-on, initialize first, and then wait for the acquisition time ①. When the acquisition time is up, the controller 3 reads the port state collected by the signal acquisition and processing module 2, and the controller 3 compares the newly read state with the Compare the original state, and if there is a change, judge whether the parking space has changed from no car to having a car? If it is necessary to judge whether the parking is regulated according to the status value, if the parking is regulated, upload the data to the data server 5, and then return to the waiting time for collection ①. If the parking is not regulated, the data will be uploaded to the data server 5, and the driver or the owner of the vehicle will be notified "please regulate the parking" until the driver or the owner regulated the parking. Then go back to the waiting time for collection ①, and cycle in turn to determine whether there is a change from no car to having a car, and if so, upload the data to the data server 5 . Then, the program returns to waiting for the acquisition time ①, and loops in turn. If the state value collected by controller 3 is "1111", it means that the parking space is free, and if the state value collected by controller 3 is "0000", the parking space is "standard parking", and the state value collected by controller 3 is not all "0" or not all "1" ”, the parking space is misplaced parking.

As shown in Figure 6, the controller 3 uploads the parking information to the data server 5 through the communication module 4, and the data server 5 pushes information such as irregular parking and misplaced parking to the user's mobile phone terminal through SMS and WeChat to guide the user's vehicle to park in a standard way. .

As shown in Figure 7, if there are many parking spaces in the garage, multiple parking space information collection terminals (controller 3) need to be used. If each parking space information collection terminal is equipped with a wireless communication module, the use cost will increase a lot. In order to solve this problem, it can be managed in layers. The parking garage management terminal can be connected with multiple (up to 256) parking space information collection terminals (controllers) through the R485 bus, and then connected with the data server 5 through the communication module 4 to achieve effective information. send.

The present invention realizes the information induction control of the guided parking space through the photoelectric collection technology and the transmission control technology, and has a significant effect compared with the prior art, as shown in the following table.

Claims (7)

1. A parking stall information guidance control system is characterized by comprising a diffuse reflection infrared detection sensor, a signal acquisition processing module, a controller, a communication module and a data server; the diffuse reflection infrared detection sensor comprises a luminous body and a light receptor, and the luminous body and the light receptor are respectively connected to the signal acquisition processing module; the signal acquisition processing module is connected with the controller, and the controller is connected with the data server through the communication module; the diffuse reflection infrared detection sensors are arranged at four different positions of the parking space, and the luminous bodies emit light upwards;

the controller judges the parking space state according to the on-off states of the four diffuse reflection infrared detection sensors acquired by the signal acquisition and processing module, and uploads the parking space state to the data server through the communication module, and the data server transmits the parking space state to the user terminal to guide the vehicle to park in a standard mode.

2. The carport information guidance control system according to claim 1, characterized in that: the infrared light beam emitted by the luminous body is modulated by frequency, and the modulation frequency is 35 KHz.

3. The carport information guidance control system according to claim 1, characterized in that: after the light receptor receives the infrared beam signal reflected by the light emitter, the parking space state signal output by the signal acquisition and processing module is '0', otherwise, the parking space state signal is '1'.

4. The carport information guidance control system according to claim 1, characterized in that: the parking space length and width are 5.0 meters and 2.6 meters respectively, two diffuse reflection infrared detection sensors in four different positions are arranged on a central line between two width boundaries of the parking space and are 90 centimeters away from the nearest width boundary, and the other two diffuse reflection infrared detection sensors are arranged on a central line between two length boundaries of the parking space and are 100 centimeters away from the nearest length boundary.

5. The carport information guidance control system according to claim 1, characterized in that: the controller adopts a single chip microcomputer and is used for outputting the using state induction information of the parking space.

6. The carport information guidance control system according to claim 1, characterized in that: the signal acquisition processing module comprises a modulation circuit, a carrier frequency circuit, a demodulation circuit, a frequency division circuit and a decoding circuit; the modulation circuit and the carrier frequency circuit are used for modulating infrared light emitted by the luminous body, and the demodulation circuit, the frequency division circuit and the decoding circuit are used for frequency demodulation and detection; the modulation circuit superposes the parking space signal on the carrier frequency circuit, and the parking space signal and the carrier frequency signal are superposed into a mixed signal with long transmission distance and strong anti-interference capability; the light receptor receives the modulated infrared light signal and carries out on-state conversion through the demodulation circuit, the frequency division circuit and the decoding circuit.

7. The carport information guidance control system according to claim 1, characterized in that: the controller judges the parking space state according to the received parking space state signal output by the signal acquisition processing module, if the parking space state is standard parking when four '0's are received, the parking space state is idle when four '1's are received, and the parking space state is not standard parking under other conditions.

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