阅读说明：本技术 一种基于校车安全装置巡更的实现方法 (Patrol achieving method based on school bus safety device ) 是由 王长宝 张静 刘从军 于 2019-09-02 设计创作，主要内容包括：本发明公开了一种基于校车安全装置巡更的实现方法,在于,当点火钥匙退出ON档和下客门处于打开时,自主触发安全装置电源开启；巡视结束和终止巡视时,自主触发安全装置电源关闭；电源开启：控制安全关门装置阻止头伸出,禁止关车门,输出正常响度下车提示音,并开始巡更控制,待到操作巡视按钮时,开始对人体探测系统的输出响应：①识别到车内无人,输出高响度下车提示音,否则,输出正常响度下车提示音；②待识别到过车内无人或从无人再次识别到车内有人后,允许再次操作巡视按钮,待操作巡视按钮后,而待识别到车内无人时,停止提示音输出,巡更结束,控制安全关门装置阻止头复位缩回,允许关车门,并输出控制信号自主触发安全装置电源关闭。(The invention discloses a patrol realization method based ON a school bus safety device, which is characterized in that when an ignition key exits from an ON gear and a passenger door is opened, a power supply of the safety device is automatically triggered to be started; when the patrol is finished and the patrol is terminated, the power supply of the safety device is triggered to be turned off automatically; and (3) power supply turning on: the safe door closing device of control prevents that the head stretches out, forbids to close the door, outputs normal loudness warning sound of getting off to begin to patrol and control, when waiting to operate to patrol the button, begin to respond to human detection system's output: firstly, recognizing that no person exists in the vehicle, outputting a high-loudness departure warning tone, otherwise, outputting a normal-loudness departure warning tone; and secondly, after no person in the vehicle is identified or the person in the vehicle is identified again, the patrol button is allowed to be operated again, after the patrol button is operated and the person in the vehicle is identified, the output of the prompt tone is stopped, the patrol is finished, the safety door closing device is controlled to prevent the head from resetting and retracting, the vehicle door is allowed to be closed, and a control signal is output to autonomously trigger the power supply of the safety device to be closed.)

1. A patrol realization method based on a school bus safety device comprises a patrol button, a safety door closing device, a voice prompter, a vehicle door state detector, an ignition switch detector, a monitoring controller of a human body detection system and a power switch control module, wherein the patrol button, the safety door closing device, the voice prompter, the vehicle door state detector, the ignition switch detector and the monitoring controller are connected with the monitoring controller; the power input of the car door state detector, the ignition switch detector and the power switch control module is connected with a power supply, and the power input of the patrol button, the safe door closing device, the voice prompter, the human body detection system and the monitoring controller is connected with the power supply through the switch of the power switch control module; one input control end of the power switch control module for triggering to be opened is connected with the vehicle door state detector, and the other input control end of the power switch control module for triggering to be opened is connected with the ignition switch detector; the input control end of the power switch control module, which triggers to close, is connected with the monitoring controller; the method is characterized by comprising the following steps:

1) when the ignition switch detector detects that the ignition key exits from the ON gear, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

2) when the vehicle door state detector detects that the passenger door is in an open position, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

3) the power switch control module triggers an input control end to be opened, when a low level signal output by the ignition switch detector and a low level signal output by the vehicle door state detector are received, the switch of the power switch control module is triggered to be switched on, and the monitoring controller, a patrol button, a safety door closing device, a voice prompter and a human body detection system which are connected with the monitoring controller are electrified;

4) the monitoring controller circular telegram, the prevention head of control safety door closing device stretches out, forbids the door to close, outputs the prompt tone of getting off of normal loudness to begin to patrol control:

waiting to operate the patrol button, starting to respond to the output of the human body detection system, and shielding the patrol button:

firstly, recognizing that no person is in the vehicle, outputting a high-loudness get-off prompt tone, otherwise, keeping/recovering the normal-loudness get-off prompt tone,

secondly, when no person is identified in the vehicle or when no person is identified in the vehicle again, the patrol button is released, when the patrol button is operated, the absence of the person in the vehicle is identified, the prompt tone output is stopped, the patrol is finished, the stopping head of the safety door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6 is carried out;

5) in the patrol process, the monitoring controller identifies that the ignition key returns to an ON gear, the patrol is terminated, the stopping head of the safe door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6) is carried out;

6) the monitoring controller outputs a high level to an input control end triggered to be closed by the power switch control module, when a door state detector detects that a passenger door is not in an open position, the time delay is started, and after the time delay is up, a low level is output to the input control end triggered to be closed by the power switch control module, the switch of the power switch control module is disconnected, and the monitoring controller, a patrol button connected with the monitoring controller, a safety door closing device, a voice prompter and a human body detection system are powered off.

2. The method for realizing patrol based on the school bus safety device according to claim 1, wherein the getting-off prompt tone with normal loudness is output, and the loudness of the getting-off prompt tone is set to be between 40 decibels and 50 decibels.

3. The method according to claim 1, wherein the high loudness of the get-off prompt tone is set to be greater than 50 db and less than 65 db.

4. The method for realizing patrol based on the safety device of the school bus according to claim 1, wherein the patrol button is a click button.

5. The method according to claim 1, wherein the human body detection system monitors whether people are in the whole compartment in real time.

6. A method for implementing a patrol based on a school bus safety device according to claim 1, wherein said delay time is set between 1 minute and 5 minutes.

Technical Field

The invention relates to the technical field of automobiles, in particular to an anti-missing patrol and control method for a school bus.

Background

At present, omit on the school bus for the student, some set up in the carriage and patrol the button to force attendant or driver to patrol the whole car, treat to patrol the button operation after, show to patrol, can close the door, but its existence: when the student got off the car in-process (the student did not finish all getting off), accompanying person or driver's responsibility is not strong, in advance to getting off behind the tour button operation, probably omit the student on the car as usual, be like this: 201220301199.8, the name is: a passenger missing getting-off reminding control device and a school bus using the same are disclosed; also have through human monitoring devices come whether someone exists in the real-time monitoring car, when nobody, just can close the door, and does not have absolute safe thing in the world, in case human monitoring devices breaks down or the reason of monitoring means, actually have someone but its monitoring can't exist and deem nobody, this moment, if do not go to the car to patrol, probably omit the student on the car as usual, be if the application number is: 201480001683.0, the name is: a school bus child alarm device; there are many methods of post-mortem remediation, not to mention.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a patrol implementation method based on a school bus safety device.

In order to achieve the above purpose, the technical solution of the present invention is:

a patrol realization method based on a school bus safety device comprises a patrol button, a safety door closing device, a voice prompter, a vehicle door state detector, an ignition switch detector, a monitoring controller of a human body detection system and a power switch control module, wherein the patrol button, the safety door closing device, the voice prompter, the vehicle door state detector, the ignition switch detector and the monitoring controller are connected with the monitoring controller; the power input of the car door state detector, the ignition switch detector and the power switch control module is connected with a power supply, and the power input of the patrol button, the safe door closing device, the voice prompter, the human body detection system and the monitoring controller is connected with the power supply through the switch of the power switch control module; one input control end of the power switch control module for triggering to be opened is connected with the vehicle door state detector, and the other input control end of the power switch control module for triggering to be opened is connected with the ignition switch detector; the input control end of the power switch control module, which triggers to close, is connected with the monitoring controller; the implementation method comprises the following steps:

1) when the ignition switch detector detects that the ignition key exits from the ON gear, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

2) when the vehicle door state detector detects that the passenger door is in an open position, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

3) the power switch control module triggers an input control end to be opened, when a low level signal output by the ignition switch detector and a low level signal output by the vehicle door state detector are received, the switch of the power switch control module is triggered to be switched on, and the monitoring controller, a patrol button, a safety door closing device, a voice prompter and a human body detection system which are connected with the monitoring controller are electrified;

4) the monitoring controller circular telegram, the prevention head of control safety door closing device stretches out, forbids the door to close, outputs the prompt tone of getting off of normal loudness to begin to patrol control:

waiting to operate the patrol button, starting to respond to the output of the human body detection system, and shielding the patrol button:

firstly, recognizing that no person is in the vehicle, outputting a high-loudness get-off prompt tone, otherwise, keeping/recovering the normal-loudness get-off prompt tone,

secondly, when no person is identified in the vehicle or when no person is identified in the vehicle again, the patrol button is released, when the patrol button is operated, the absence of the person in the vehicle is identified, the prompt tone output is stopped, the patrol is finished, the stopping head of the safety door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6 is carried out;

5) in the patrol process, the monitoring controller identifies that the ignition key returns to an ON gear, the patrol is terminated, the stopping head of the safe door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6) is carried out;

6) the monitoring controller outputs a high level to an input control end triggered to be closed by the power switch control module, when a door state detector detects that a passenger door is not in an open position, the time delay is started, and after the time delay is up, a low level is output to the input control end triggered to be closed by the power switch control module, the switch of the power switch control module is disconnected, and the monitoring controller, a patrol button connected with the monitoring controller, a safety door closing device, a voice prompter and a human body detection system are powered off.

The loudness of the get-off prompt tone which outputs the normal loudness is set to be between 40 decibels and 50 decibels.

The loudness of the get-off prompt tone for outputting high loudness is set to be greater than 50 decibels and less than 65 decibels.

The patrol button is a point touch button.

The human body detection system monitors whether people exist in the whole carriage in real time.

The above-mentioned delay time is set to be between 1 minute and 5 minutes.

Has the advantages that:

the invention discloses a patrol realization method based on a school bus safety device, which is mainly characterized in that:

the method has the advantages that in the process of getting off a student, two times of patrol are required to be performed in the student, the time of the last patrol is limited, and patrol is performed when a human body detection system determines that no person exists in the student at least once;

when the human body detection system determines that no person exists in the vehicle, a high-loudness vehicle getting-off prompt tone is output, so that missing students can be called, and physical and psychological health of the students is not influenced;

after the first tour, the human body detection system determines whether a person is in the vehicle, so that the responsibility of people-following managers and drivers can be enhanced;

and the school bus safety device is automatically powered on when patrolling, and is automatically powered off when the patrol is finished and the patrol is stopped.

The characteristics are favorable for preventing children from being missed, and the school bus safety device is independently powered on and off, so that convenience is brought to and electricity is saved.

Drawings

FIG. 1 is a schematic diagram of a school bus safety device based on which the patrol implementation method of the present invention is based;

FIG. 2 is a schematic diagram of a power-saving power supply connection of a school bus safety device based on the patrol implementation method of the present invention;

FIG. 3 is a schematic diagram of an embodiment of a power switch control module for power saving and power supply of a school bus safety device according to the patrol implementation method of the present invention;

FIG. 4 is a flow chart of a patrol implementation method in a power-on state of the school bus safety device;

FIG. 5 is a flow chart of a patrol implementation method in a power-saving and power-supplying state of a school bus safety device;

wherein: 1. the system comprises a monitoring controller, 2, an ignition switch detector, 3, a vehicle door state detector, 4, a patrol button, 5, a voice prompter, 6, a human body detection system, 7, a safe door closing device, D1, D2, D3, a diode, 10, a power switch control module, 20, a power supply, C1, C2. capacitors, T1, a first switch tube, T2, a second switch tube, R1, R2, R3, R4, R5 and R6. resistors, SCR, J relay and 11 or door.

Detailed Description

As shown in fig. 1, the school bus safety device comprises a monitoring controller 1 connected with a patrol button 4, a safety door closing device 7, a voice prompter 5, a vehicle door state detector 3, an ignition switch detector 2 and a human body detection system 6.

The patrol button is a point-touch button, is arranged at a place which cannot be covered by children below 1.2 meters at the tail of the carriage and is used for guiding drivers and passengers to walk from the front part to the rear part in the carriage to patrol the carriage.

The safety door closing device is arranged on a passenger door of a vehicle and used for specifically controlling whether the passenger door allowed to be opened is closed or not. When the stop head (power head) of the electric element of the safe door closing device extends out, the door is blocked, and the door of a passenger can not be closed. When the stop head (power head) of the electric element of the safe door closing device is reset and retracted, the passenger door can be closed. When the monitoring controller controls the safe door closing device to be electrified, a stopping head (power head) of an electric element of the safe door closing device extends out; when the monitoring controller controls the safe door closing device to be powered off, the stop head (power head) of the electric element of the safe door closing device resets and retracts.

The voice prompter is arranged in the vehicle and used for outputting a departure prompting sound, calling personnel in the vehicle to get off the vehicle and reminding the driver and the passengers to patrol the vehicle. Whether the voice prompter outputs or not and the output volume are monitored by the controller. When the monitoring controller outputs a voice stopping control signal to the voice prompter, the voice prompter stops outputting the departure prompting sound; when the monitoring controller outputs the playing voice and the sound loudness control signal to the voice prompter, the voice prompter outputs the departure prompting sound, and the loudness is controlled by the sound loudness control signal: when the sound loudness control signal is a normal loudness control signal, the voice prompter outputs a get-off prompt tone with normal loudness, and the loudness of the get-off prompt tone with normal loudness is set to be between 40 decibels and 50 decibels; when the sound loudness control signal is a high loudness control signal, the voice prompter outputs a high loudness get-off prompt tone, and the loudness of the high loudness get-off prompt tone of the invention is set to be more than 50 decibels and less than 65 decibels.

The vehicle door state detector is arranged at the lower vehicle door and used for detecting whether the vehicle door is in the opening position or not, outputting a signal that the vehicle door is in the opening position to the monitoring controller 1 when detecting that the vehicle door is in the opening position, and otherwise, outputting a signal that the vehicle door is not in the opening position to the monitoring controller 1.

The ignition switch detector is arranged at an ignition switch of the vehicle and used for detecting the state of the ignition switch of the vehicle, outputting a signal that the ignition key exits the ON gear to the monitoring controller 1 when detecting that the ignition key exits the ON gear, and outputting a signal that the ignition key returns to the ON gear to the monitoring controller 1 when detecting that the ignition key returns to the ON gear.

The human body detection system is fixedly installed in the carriage, is used for comprehensively monitoring whether people exist in the carriage, namely is used for monitoring whether people exist in the whole carriage in real time, and comprises video monitoring, a seat switch and the like. A monitoring, identifying and judging module for determining whether a person exists in the carriage or not is embedded in the human body detection system and is used for determining whether the person exists in the carriage or not through on-off processing and identifying and judging of the real-time video monitoring image and the seat switch and transmitting the result to the monitoring controller. The human body detection system receives a request output signal sent by the monitoring controller, releases the monitoring, identifying and judging module whether a person exists, processes, identifies and judges the real-time video monitoring image and the on-off of the seat switch, and outputs a person signal in the carriage to the monitoring controller when the person exists, otherwise, outputs an unmanned signal in the carriage to the monitoring controller. The human body detection system receives a request stop output signal sent by the monitoring controller, suspends the released monitoring and identifying judgment module for whether a person exists, and stops processing, identifying and judging the real-time video monitoring image and the on-off state of the seat switch.

The monitoring controller is used for more comprehensive patrol identification and control and comprises a central processing unit, an identification program module, a control program module, a request program module and corresponding input and output interface circuits connected with external equipment such as a patrol button, a safe door closing device, a voice prompter, a vehicle door state detector, an ignition switch detector, a human body detection system and the like.

When the monitoring controller identifies that the ignition key exits from an ON gear through the ignition switch detector, and identifies that the door of the passenger car is in an open position through the door state detector, the door opened is identified to be completely discharged, the stop head (power head) of the safe door closing device is controlled to stretch out, namely, the monitoring controller controls the safe door closing device to be electrified, and the door is forbidden to be closed.

When the monitoring controller recognizes that the ignition key returns to the ON gear through the ignition switch detector, the stopping head (power head) of the safe door closing device is controlled to reset and retract, namely the monitoring controller controls the safe door closing device to be powered off/keep powered off, and the vehicle door is allowed to be closed.

As shown in fig. 4, the patrol implementation method in the power-on state of the school bus safety device is as follows:

discernment ignition key withdraws from ON shelves when the monitor controller through the ignition switch detector, and discerns through door state detector that the door of next door is in the open position, the door of affirming opening is carried out and is got off the visitor comprehensively, send request output signal to human detection system, and the head (unit head) that prevents of control safety door closing device stretches out, monitor controller control safety door closing device circular telegram promptly, forbid the door and close, monitor controller control voice prompt device outputs the prompt tone of getting off of normal loudness, and begin to patrol and control: waiting for operation of the patrol button: the monitoring controller waits to patrol the button operation, begins to respond to human body detection system's output to the button is patrolled in the shielding:

the method includes the steps of identifying that no person exists in a vehicle, and controlling a voice prompt to output a high-loudness get-off prompt tone;

secondly, identifying a person in the vehicle, and controlling the voice prompter to keep/recover to output a get-off prompt tone with normal loudness;

releasing the shielded patrol button when no person is identified in the vehicle or when no person identifies the person in the vehicle again;

after the shielded patrol button is released, waiting for the operation patrol button: after waiting to operate the tour button, when waiting to discern nobody in the car, control voice prompt and stop prompt tone output to the affirmation is patrolled and is ended: and controlling the stopping head (power head) of the safe door closing device to reset and retract, namely controlling the safe door closing device to be powered off by the monitoring controller, allowing the door to be closed, and sending a request to the human body detection system to stop outputting signals.

During the patrol control, the monitoring controller recognizes that the ignition key returns to the ON position, and terminates the patrol: and controlling the stopping head (power head) of the safe door closing device to reset and retract, namely controlling the safe door closing device to be powered off by the monitoring controller, allowing the door to be closed, and sending a request to the human body detection system to stop outputting signals.

The school bus safety device works in a power-on state, a vehicle speed detection module and a mark register are further arranged in a monitoring controller in the school bus safety device, when the vehicle speed detection module identifies that the vehicle has speed (runs), the monitoring controller sets the mark register to be 1, and when the monitoring controller determines that the patrol is finished, the mark register is cleared to be 0.

When the monitoring controller identifies that the ignition key exits from the ON gear through the ignition switch detector and identifies that the door of the passenger car is in the open position through the door state detector, the opened door is determined to be fully released, namely the door is completely released when the marking register is read to be in the state of '1', otherwise, the input of the ignition switch detector and the door state detector is not responded. The purpose is as follows: the vehicle is prevented from repeatedly patrolling after stopping, and the vehicle is prevented from patrolling when the door is opened.

When the end of the patrol is determined as described above, the flag register is also cleared to "0".

The power on/off of the school bus safety device is generally connected into a manual switch or a normally-on state. In order to save electricity and facilitate, the invention also adds the power switch control module 10, only connect the ignition switch detector and the car door state detector into the normal power state, the other power is supplied by the power through the added power switch control module, and aiming at the voice prompter and the human body detection system, the power switch control module is connected with the power input through the isolating diode respectively.

When the school bus safety device is in the power-on state, the school bus safety device is always connected with the power supply.

As shown in fig. 2, the school bus safety device saves electricity and supplies power, and is additionally provided with a power switch control module 10, a diode D1 and a diode D2; the power switch control module 10 is provided with two input control ends which are triggered to be turned on and turned off, and one input control end which is triggered to be turned off and controlled by high and low levels; a power supply cut-off control program module is additionally arranged in the monitoring controller 1 and is used for identifying the working state and outputting a corresponding power supply cut-off control signal to an input control end of the power supply switch control module 10 for triggering to be closed according to the working state; the power supply input of the ignition switch detector 2 and the vehicle door state detector 3 are directly connected with the power supply 20, and the ignition switch detector 2 and the vehicle door state detector 3 are additionally provided with a trigger power supply opening control signal output end which is respectively connected with an input control end for triggering and opening of the power supply switch control module 10; the ignition switch detector 2 is arranged to detect that the ignition key exits an ON gear, trigger a power supply starting control signal output end to output a low level to the power supply switch control module 10, and otherwise, output a high level to the power supply switch control module 10; according to the invention, a vehicle door state detector 3 is arranged to detect that a passenger door is in an open position, trigger a power supply start control signal output end to output a low level to a power supply switch control module 10, otherwise, output a high level to the power supply switch control module 10; the power input of the power switch control module 10 is connected with the power supply 20, the power output of the power switch control module 10 directly supplies power to the monitoring controller 1, the patrol button 4 and the safety door closing device 7, the power output of the power switch control module 10 is connected with the power input end of the voice prompter 5 after being connected with the forward serial diode D1, the power output of the power switch control module 10 is connected with the power input end of the human body detection system 6 after being connected with the forward serial diode D2, the monitoring controller 1 is additionally provided with a trigger power supply closing control signal output end which is connected with the input control end of the power switch control module 10 for triggering closing, when the monitoring controller 1 finishes patrol or detects that an ignition key returns to an ON gear, the monitoring controller 1 outputs a trigger power supply closing control signal to the power switch control module 10 to trigger the ON-off of the power supply, and saving electricity.

In order to prevent other power supplies for supplying power to the voice prompter 5 and the human body detection system 6 from being connected in series with other circuits of the school bus safety device to affect power saving, the voice prompter 5 and the human body detection system 6 are generally multipurpose, so that in the invention, a power supply output forward string diode D1 of the power switch control module 10 is connected with a power supply input end of the voice prompter 5, and a power supply output forward string diode D2 of the power switch control module 10 is connected with a power supply input end of the human body detection system 6.

As shown in fig. 3, the power switch control module 10 for saving power and supplying power for the school bus safety device includes: the circuit comprises an OR gate 11, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a first switch tube T1, a second switch tube T2, a silicon controlled rectifier SCR, a diode D3, a relay J, a capacitor C1 and a capacitor C2; the positive pole of the power supply 20 is connected with the normally open contact of the relay J in series and then is output OUT of the power switch control module 10; the output OUT of the power switch control module 10 is connected in series with the capacitor C1 and then is connected to the negative electrode of the power supply 20; the power supply input end of the OR gate 11 is connected with the anode of the power supply 20, and the power supply cathode of the OR gate 11 is connected with the cathode of the power supply 20; one input end of the OR gate 11 is connected with a trigger power supply starting control signal output end additionally arranged on the ignition switch detector 2, and the other input end of the OR gate 11 is connected with a trigger power supply starting control signal output end additionally arranged on the vehicle door state detector 3; the output end of the or gate 11 is connected in series with the resistor R3 and then connected with the base of the first switch tube T1, the base of the first switch tube T1 is connected in series with the resistor R4 and then connected with the negative electrode of the power supply 20, and the emitter of the first switch tube T1 is connected with the negative electrode of the power supply 20; one end of a resistor R1 is connected with the anode of the power supply 20, the other end of the resistor R1 is connected with one end of a capacitor C2 and the collector of a first switch tube T1 in parallel, the other end of the capacitor C2 is connected with one end of a resistor R2 and the control end (grid) of a Silicon Controlled Rectifier (SCR) in parallel, the other end of a resistor R2 and the cathode of the Silicon Controlled Rectifier (SCR) are connected with the cathode of the power supply 20, the anode of the Silicon Controlled Rectifier (SCR) is connected with the anode of the power supply 20 after being connected with a relay J coil in series, and a diode D3 for follow current is connected with the relay J coil in parallel; one end of the resistor R5 is connected with a trigger power supply closing control signal output end additionally arranged on the monitoring controller 1, the other end of the resistor R5 is connected with one end of the resistor R6 and the base electrode of the second switch tube T2 in parallel, the other end of the resistor R6 and the emitter electrode of the second switch tube T2 are connected with the negative electrode of the power supply 20, and the collector electrode of the second switch tube T2 is connected with the anode of the SCR.

The capacitor C1 is used to ensure that the power output of the power switch control module 10 disappears after a proper delay after the relay J is disconnected, which is beneficial to effectively cutting off the power supply.

And the SCR is a one-way SCR and is used for triggering and keeping the J coil of the relay to be electrified.

The or gate 11 is a two-input or gate, that is, when both input ends input a low level, its output end outputs a low level, otherwise, its output end outputs a high level. Two input ends of the or gate 11 are two input control ends of the power switch control module 10 for triggering to be turned on respectively.

When the output of the or gate 11 changes from high level output to low level output, the first switch tube T1 changes from on saturation to off, the power supply 20 generates an effective trigger control signal to the control end (gate) of the silicon controlled SCR through the resistor R1 and the capacitor C2, the silicon controlled SCR is triggered to turn on, the relay J coil is energized, after the capacitor C2 is full, the trigger control signal of the silicon controlled SCR disappears, and at this time, when the or gate 11 keeps outputting low level, the power supply 20 sends no trigger control signal to the control end (gate) of the silicon controlled SCR through the resistor R1 and the capacitor C2.

When the output of the or gate 11 changes from low level output to high level output, the first switch tube T1 changes from off to on saturation, the capacitor C2 forms a discharge loop through the first switch tube T1 and the resistor R2, and the capacitor C2 discharges, so as to: when the or gate 11 outputs a low level again, the first switch tube T1 is turned from on saturation to off, and the power supply 20 generates a trigger control signal to the control terminal (gate) of the SCR through the resistor R1 and the capacitor C2, so as to meet the requirement of the control signal for triggering and turning on the SCR. Because the negative voltage is formed on the resistor R2 in the discharging process of the capacitor C2, an effective trigger signal cannot be generated on the SCR. And because the first switch tube T1 that is turned on plays a clamping role, no trigger signal (so to speak, no effective trigger signal) is sent to the control end (gate) of the SCR after the capacitor C2 finishes discharging.

Due to the effect of the capacitor C2 during the low level output period of the or gate 11, i.e. the off period of the first switch transistor T1, a valid trigger signal is generated to trigger the SCR to turn on, and when the capacitor C2 is full, no trigger signal (so to speak, no valid trigger signal) is sent to the control terminal (gate) of the SCR.

During the high level output period of the or gate 11, i.e. during the saturation conduction period of the first switch tube T1, no effective trigger signal is sent to the SCR control terminal (gate) during the discharge process of the capacitor C2, and the conducted first switch tube T1 plays a clamping role, so that no effective trigger signal is sent to the SCR control terminal (gate) after the capacitor C2 discharges.

And when the conducted silicon controlled rectifier SCR has no trigger signal, controlling the current of the conducted silicon controlled rectifier SCR to be smaller than the maintaining current, and conducting the silicon controlled rectifier SCR to be disconnected. The second switch tube T2 is turned off, and the current passing through the SCR is not affected. The second switch tube T2 is in conduction saturation, the voltage drop is only about 0.3V, and the conduction voltage drop of the thyristor SCR is greater than 1V, so that the conduction thyristor SCR is turned off.

The SCR is switched on, the coil of the relay J is switched on, the normally open contact of the relay J is switched on, and the power supply 20 reaches the output OUT through the normally open contact switched on by the relay J. The SCR is turned off, the coil of the relay J is not electrified, the normally open contact of the relay J is disconnected/kept disconnected, and the power supply 20 cannot reach the output OUT through the normally open contact disconnected by the relay J.

The base electrode of the second switch tube T2 is connected to the additional trigger power supply turn-off control signal output end of the monitoring controller 1 through a resistor R5, and the input end of the resistor R5 connected with the outside is the input control end for the power supply switch control module 10 to trigger turn-off.

The school bus safety device is power-saving and power-supplying, and the on/off realization method of the additionally arranged power switch control module 10 is as follows:

the ignition switch detector 2 outputs a low level to an input control end which is connected with a power switch control module 10 and is triggered to be turned ON when detecting that an ignition key exits an ON gear, otherwise, outputs a high level to the input control end which is connected with the power switch control module 10 and is triggered to be turned ON;

secondly, the vehicle door state detector 3 detects that the lower passenger door is in an open position, and outputs a low level to the input control end which is connected with the power switch control module 10 and triggers opening, otherwise, outputs a high level to the input control end which is connected with the power switch control module 10 and triggers opening;

thirdly, when the power switch control module 10 receives that the ignition switch detector 2 and the vehicle door state detector 3 both output low levels, the SCR is triggered and kept on, the coil of the relay J is electrified, the normally open contact of the relay J is connected, and the power supply 20 reaches the output end through the normally open contact of the relay J;

after the patrol is finished or terminated, the monitoring controller 1 outputs a high level to an input control end triggered to be closed by the power switch control module 10, the time delay is started when the monitoring controller 1 detects that the passenger door is not in an open position through the vehicle door state detector 3, and after the time delay is up, the monitoring controller 1 outputs a low level to the input control end triggered to be closed by the power switch control module 10 until the J coil of the relay is powered off;

and fifthly, the coil of the relay J is powered off, the normally open contact of the relay J is disconnected, and therefore the power output of the power switch control module 10 is cut off.

The above-mentioned delay time is set between 1 minute and 5 minutes.

The safety device of the school bus is connected into a power-saving power supply state, and the monitoring program in the monitoring controller is set as follows: when the monitoring controller is powered on, the following defaults are performed: the ignition key exits from an ON gear and the door of the passenger car is located at an opening position, namely, the passenger car is completely checked by default, a request output signal is sent to the human body detection system, a stop head (power head) of the safe door closing device is controlled to stretch out, namely, the monitoring controller controls the safe door closing device to be electrified and forbids the door to be closed, and the monitoring controller controls the voice prompt to output a getting-off prompt tone with normal loudness and starts to patrol and control.

As shown in fig. 5, the patrol implementation method of the school bus safety device in the power-saving and power-supplying state is as follows:

1) when the ignition switch detector detects that the ignition key exits from the ON gear, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

2) when the vehicle door state detector detects that the passenger door is in an open position, outputting a low level to the input control end triggered to be opened by the corresponding power switch control module, otherwise, outputting a high level to the input control end triggered to be opened by the corresponding power switch control module;

3) the power switch control module triggers an input control end to be opened, when a low level signal output by the ignition switch detector and a low level signal output by the vehicle door state detector are received, the switch of the power switch control module is triggered to be switched on, and the monitoring controller, a patrol button, a safety door closing device, a voice prompter and a human body detection system which are connected with the monitoring controller are electrified;

4) the monitoring controller circular telegram, the prevention head of control safety door closing device stretches out, forbids the door to close, outputs the prompt tone of getting off of normal loudness to begin to patrol control:

waiting to operate the patrol button, starting to respond to the output of the human body detection system, and shielding the patrol button:

firstly, recognizing that no person is in the vehicle, outputting a high-loudness get-off prompt tone, otherwise, keeping/recovering the normal-loudness get-off prompt tone,

secondly, when no person is identified in the vehicle or when no person is identified in the vehicle again, the patrol button is released, when the patrol button is operated, the absence of the person in the vehicle is identified, the prompt tone output is stopped, the patrol is finished, the stopping head of the safety door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6 is carried out;

5) in the patrol process, the monitoring controller identifies that the ignition key returns to an ON gear, the patrol is terminated, the stopping head of the safe door closing device is controlled to reset and retract, the vehicle door is allowed to be closed, and the step 6) is carried out;

6) the monitoring controller outputs a high level to an input control end triggered to be closed by the power switch control module, when a door state detector detects that a passenger door is not in an open position, the time delay is started, and after the time delay is up, a low level is output to the input control end triggered to be closed by the power switch control module, the switch of the power switch control module is disconnected, and the monitoring controller, a patrol button connected with the monitoring controller, a safety door closing device, a voice prompter and a human body detection system are powered off.

The school bus safety device is connected to a power-saving power supply state to work, an opened bus door read and judged by an ignition switch detector and a bus door state detector in a monitoring controller is a function shielding screen for passengers to get off comprehensively, namely the monitoring controller is powered on to be identified: the ignition key exits the ON gear and the lower door is in the open position.

The purpose of the above delay is: so that repeated night watching can not occur in the delay time.