CN103646501A - Left-in-vehicle-child early warning system based on pressure sensing - Google Patents

Abstract

The invention discloses a left-in-vehicle-child early warning system based on pressure sensing and aims to solve a problem that only detection but not alarming is paid attention to. The left-in-vehicle-child early warning system comprises a system enablement detection unit, a left-in-vehicle-child detection unit, an electrical control unit and an execution unit, wherein a +5V output end of the electrical control unit, the number One to the number Three analog-to-digital conversion chips U1 with a TCL2543 model, an analog-to-digital conversion chip U7 with a model ADC0832 are connected with a controlled system of a relay U12, the other end of the controlled system of the relay U12 is connected with a pin VCC of a single-chip microcomputer, the system enablement detection unit is connected with an input end of the controlled system of the relay U12, the left-in-vehicle-child detection unit is connected with the single-chip microcomputer through the number Two and the number Three signal amplification circuits and the analog-to-digital conversion chip U7 with the model ADC0832, the execution unit is connected with the single-chip microcomputer through the number Four signal amplification circuit, and the execution unit is connected with the single-chip microcomputer through the number Five signal amplification circuit.

Description

Based on pressure sensing child, be set to early warning system in car

Technical field

The present invention relates to a kind of prior-warning device being applied on automobile, or rather, the present invention relates to a kind ofly based on pressure sensing child, be set to early warning system in car.

Background technology

Along with automobile industry develops rapidly, recoverable amount and the utilization rate of automobile raise day by day, for the safety in automobile and hommization systematic research, are also more and more subject to people's attention.Often have in recent years because head of a family carelessness passes into silence children and in car, cause the thing of its death by suffocation to occur, and the children that pass into silence in school bus suffocate or the case of being poisoned to death is also of common occurrence.

Collected at present the suffocate domestic patent of invention of pre-alarming safety device of children in car as follows, but it focuses on the transmission of distress signal, the detection of children being shelved separately to situation can not effectively judge.As

1. Chinese patent notification number is CN202268054, and the day for announcing is on June 6th, 2012, and invention and created name is " a kind of vehicle alarming reminder for children ", and the patent No. is CN201120346745.5, the artificial Zhou Zhenhai of application (patent right).

2. Chinese patent notification number is CN102572156; the day for announcing is on July 11st, 2012; invention and created name is " child alert onboard system and method based on wireless sensor network "; application (patent) number is CN201210007366.2; application (patent right) Ren Wei Nanjing Aero-Space University, invention (design) people is Cao Xiulan; Wu Jie; Tian Yupeng.

Its core of patent that invention and created name is " a kind of vehicle alarming reminder for children " is wireless security security protection electronic technology, comprises at least one radiating portion and at least one receiving unit.Radiating portion is connected by wireless transmission method with receiving unit, and emitter provides to transmit and by receiving trap, received by processing again.The signal that after receiving, judgment means comparison receiving trap is received and the size of prevalue, determine whether report to the police and provide alerting signal by alarm output device.This device emphasis, in warning reminding, is mainly used in children alarming prompting in automobile, article reminding etc., for detection case, does not introduce in detail.

The patent that invention and created name is " child alert onboard system and method based on wireless sensor network " is a kind of child alert onboard system based on wireless sensor network, comprises several vehicle-mounted child node modules, aggregation node module and mobile phone terminal; Vehicle-mounted child node module is arranged in automobile, aggregation node module is arranged in garage or parking lot, described each vehicle-mounted child node module and aggregation node module adopt hub-and-spoke network topology mode to carry out networking, and utilize ZigBee technology to carry out radio communication and data transmission; Described aggregation node module utilizes GSM network that warning message is sent to mobile phone terminal with note form.With invention and created name, be that the patent of " a kind of vehicle alarming reminder for children " is the same, stress warning reminding, in context of detection, need perfect.

Three students of U.S. Johns Hopkins University Huai Ting engineering college (Johns Hopkins University Whiting School of Engineering) have designed and a kind ofly can in inspection vehicle, be set to child's device, but do not have the function that alerting signal is provided to car owner in time.CBS Television (CBS) also once released news and claims associating The Children's Hospital of Philadelphia of U.S. expressway safety management board to be set to prior-warning device in car to the children that sell on the market to have carried out sample survey on July 31st, 2012.Investigation result shows 18 kinds of products and has underproof phenomenon.At aspects such as sensitivity, distant signal transmission, anti-tampering signals, there is obvious defect, can not perfect reach the object of children in protection car.

Summary of the invention

Technical matters to be solved by this invention is to have overcome prior art to have the problem that detection thinks little of warning of only paying attention to, and provides a kind of and has been set to early warning system in car based on pressure sensing child.

For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize: described based on pressure sensing child, be set in car early warning system and by system enable detection unit, child, be set to detecting unit in car, ECU (Electrical Control Unit) and performance element and form.

Modulus conversion chip U7, relay U12 that the modulus conversion chip U1 that described ECU (Electrical Control Unit) is TCL2543 by single-chip microcomputer, ECU (Electrical Control Unit) power module, model, model are ADC0832 form.

ECU (Electrical Control Unit) power module+input port 3 of modulus conversion chip U7 and the system wires of being controlled of relay U12 that the port one 4 of the modulus conversion chip U1 that 5V output terminal is TCL2543 with model and port 20, model are ADC0832 be connected, and relay U12 is connected with the pin VCC electric wire of single-chip microcomputer by the other end of control system.

Model is that the port CLK of modulus conversion chip U7 and the pin P3.4 electric wire of single-chip microcomputer of ADC0832 is connected, and the port DO of the modulus conversion chip U7 that model is ADC0832 is connected with the pin P3.3 electric wire of single-chip microcomputer with port DI is same; Model is that the modulus conversion chip U1 of TCL2543 is connected with single-chip microcomputer electric wire.

The output terminal of system enable detection unit is connected with the control system electric wire of the relay U12 in ECU (Electrical Control Unit); Input port AIN0, input port AIN1 that child is set in the modulus conversion chip U1 that detecting unit in car is TCL2543 by the output terminal of No. 1 signal amplification circuit with model in ECU (Electrical Control Unit) are connected with input port AIN2 electric wire, and the analog input channel CH1 electric wire that child is set to the modulus conversion chip U7 that the output terminal of the interior detecting unit of car by No. 2 signal amplification circuits is ADC0832 with model is connected; Performance element is connected with the pin P1.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) by the input end of No. 3 signal amplification circuits, performance element is connected with single-chip microcomputer pin P2.0, pin P3.0, pin P3.1, pin P2.1, pin P2.2 electric wire in ECU (Electrical Control Unit) by the input end of No. 4 signal amplification circuits, and performance element is connected with the pin P2.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) by the input end of No. 5 signal amplification circuits.

Model described in technical scheme is that the modulus conversion chip U1 of TCL2543 comprises the modulus conversion chip U1 that modulus conversion chip U1 that modulus conversion chip U1 that No. 1 model is TCL2543, No. 2 models are TCL2543, No. 3 models are TCL2543.The port I/O CLOCK of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of modulus conversion chip U1 and the pin P1.3 electric wire of single-chip microcomputer that No. 1 model is TCL2543 are connected; The port I/O CLOCK of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of No. 2 modulus conversion chip U1 that model is TCL2543 is connected with the pin P0.3 electric wire of single-chip microcomputer; The port I/O CLOCK of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.5 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.6 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of modulus conversion chip U1 and the pin P0.7 electric wire of single-chip microcomputer that No. 3 models are TCL2543 are connected.

ECU (Electrical Control Unit) power module described in technical scheme comprises switching mode voltage stabilizing chip U11, diode IN5822, capacitor C 15, C16, inductance L 1.The vehicle power electric wire that the port Vin of switching mode voltage stabilizing chip U11 and output valve are+12V is connected, the port OUTPUT of switching mode voltage stabilizing chip U11 is connected with diode IN5822 electric wire, be connected with one end electric wire of inductance L 1 simultaneously, the other end of diode IN5822 is connected with the negative pole end of capacitor C 16 and while ground connection, the port GND of switching mode voltage stabilizing chip U11 is connected with the negative pole end electric wire of capacitor C 15 and while ground connection, the vehicle power electric wire that the positive terminal of capacitor C 15 and output valve are+12V is connected, the port FEEDBACK of switching mode voltage stabilizing chip U11 with and the positive terminal of capacitor C 16, the other end electric wire of inductance L 1 is connected and the output terminal of conduct+5V voltage, the port ON/OFF ground connection of switching mode voltage stabilizing chip U11.

Child described in technical scheme is set to detecting unit in car and comprises 9 pressure transducer U3, No. 1 signal amplification circuit.The structure of 9 described pressure transducer U3 is identical, all adopts tekscan

the sensor of Sensors A201, every 3 pressure transducer U3 are on a seat that is arranged on dispersedly automobile rear of one group of shape triangular in shape, and 3 pressure transducer U3 of first group are called No. 1 pressure transducer U3, No. 2 pressure transducer U3, No. 3 pressure transducer U3; The 2nd group is called No. 4 pressure transducer U3, No. 5 pressure transducer U3, No. 6 pressure transducer U3, No. 7 pressure transducer U3, No. 8 pressure transducer U3 and No. 9 pressure transducer U3 with 6 pressure transducer U3 of the 3rd group; No. 1 described signal amplification circuit by No. 1 pressure sensor circuit, No. 2 pressure sensor circuits, No. 3 pressure sensor circuits ... form with No. 9 pressure sensor circuits, No. 1 pressure sensor circuit, No. 2 pressure sensor circuits, No. 3 pressure sensor circuits ... identical with the structure of No. 9 pressure sensor circuits, all comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, the capacitor C 4 and capacitor C 5 that model is TPS60400; model is that the transistorized cathode voltage input port 2 of MCP6004-E/P and a port electric wire of No. 1 pressure transducer U3 are connected, model is that the transistorized cathode voltage input port 3 of MCP6004-E/P is connected with earth terminal GND electric wire, model is that the transistorized cathode voltage input port 2 of MCP6004-E/P is connected with one end electric wire of variable resistor RF, transistorized Voltage-output port 1 electric wire that the other end of variable resistor RF is MCP6004-E/P with model is connected, one end electric wire of the voltage stabilizing diode that another port of No. 1 pressure transducer U3 is IN4370 with model is connected, and output port 1 electric wire of the charge pump U5 that the other end of the voltage stabilizing diode that model is IN4370 is TPS60400 with model is connected, while is connected with the positive terminal electric wire of the capacitor C 3 of one end ground connection, model is that the direct supply electric wire that the input port 2 of the charge pump U5 of TPS60400 is 5V with output valve is connected, while is connected with the positive terminal electric wire of the capacitor C 4 of one end ground connection, model is that the port 4 of the charge pump U5 of TPS60400 is connected with earth terminal GND electric wire, model is that the port 5 of charge pump U5 of TPS60400 is connected with self port 3 electric wire after capacitor C 5, model is that the input port AIN0 electric wire of the transistorized Voltage-output port 1 of the MCP6004-E/P modulus conversion chip U1 that is TCL2543 with No. 1 model is connected, form pressure sensor circuit No. 1, by above-mentioned the same manner, connect into respectively No. 2 pressure sensor circuits, No. 3 pressure sensor circuits and the 2nd group and No. 4 pressure sensor circuits of the 3rd group, No. 5 pressure sensor circuits, No. 6 pressure sensor circuits and No. 7 pressure sensor circuits, No. 8 pressure sensor circuits, No. 9 pressure sensor circuits.

Child described in technical scheme is set to detecting unit in car and also comprises Thermoelectric Infrared Sensor U8 and No. 2 signal amplification circuits.No. 2 signal amplification circuits comprise that model is NPN triode Q3, resistance R 3, resistance R 4, capacitor C 6, the capacitor C 7 of s8050.The direct supply VCC electric wire that the input port 3 of Thermoelectric Infrared Sensor U8 is 5V with output valve is connected, the base stage electric wire of the NPN triode Q3 that 27 whiles of process capacitor C of input port of Thermoelectric Infrared Sensor U8 and one end of resistance R 4 are s8050 with model is connected, the direct supply VCC that the other end of resistance R 4 is 5V with output valve is simultaneously connected with one end electric wire of resistance R 3, and the other end process capacitor C 6 of resistance R 3 is connected with the analog input channel CH1 electric wire of the modulus conversion chip U7 that the model in ECU (Electrical Control Unit) is ADC0832; Model is that the collector electric wire of the NPN triode Q3 of s8050 is connected between resistance R 3 and capacitor C 6, and the emitter of the NPN triode Q3 that model is s8050 is connected with earth terminal GND electric wire.

No. 3 signal amplification circuits described in technical scheme comprise that model is NPN triode Q1, the resistance R 1 of s8050.Model is the grounded emitter of the NPN triode Q1 of s8050, model is that the base stage of NPN triode Q1 and one end electric wire of resistance R 1 of s8050 is connected, the other end of resistance R 1 is connected with the pin P1.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), model is that the collector of NPN triode Q1 and one end electric wire of hummer U4 of s8050 is connected, and the other end of hummer U4 is connected with the positive electrical wire of 5V direct supply.

No. 4 signal amplification circuits described in technical scheme comprise that model is the NPN triode Q4 of s8050, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, capacitor C 8, capacitor C 9, capacitor C 10, capacitor C 11, capacitor C 12, capacitor C 13, capacitor C 14, LED 1.Model is the pin 1 of the dialer module U9 of TC35i, pin 2, pin 3, pin 4, the pin 5 electrochemical capacitor C8 together and after parallel connection afterwards in parallel, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the positive electrical wire of electrochemical capacitor C13 connects, electrochemical capacitor C8, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the negative electrical wire of electrochemical capacitor C13 connects, the negative pole end ground connection of capacitor C 13, as the positive terminal of electrochemical capacitor group and one end electric wire of resistance R 5, be connected simultaneously, the direct supply VCC electric wire that the other end of resistance R 5 is 5V with output valve is connected, model is the pin 6 of the dialer module U9 of TC35i, pin 7, pin 8, pin 9, after pin 10 is in parallel, be connected with the negative pole end electric wire of capacitor C 13 and ground connection, model is that the pin 15 of the dialer module U9 of TC35i is connected with one end electric wire of resistance R 6 and resistance R 9 simultaneously, resistance R 9 other end ground connection, model is that the pin 19 of the dialer module U9 of TC35i is connected with resistance R 10 with resistance R 7 simultaneously, resistance R 10 other end ground connection, the pin 20 of the dialer module U9 that model is TC35i is connected with single-chip microcomputer pin P2.1 electric wire.Model is that the pin 21 of the dialer module U9 of TC35i is connected with resistance R 11 electric wires with resistance R 8 simultaneously, resistance R 11 other end ground connection, model is that pin 24 and the pin 28 of dialer module U9 of TC35i is that port VCC electric wire is connected with the port 2 of common SIM card U10 after in parallel, model is that the pin 25 of dialer module U9 and port 4 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 26 of dialer module U9 and port 5 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 27 of dialer module U9 and port 6 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 29 of dialer module U9 and the port one electric wire of common SIM card U10 of TC35i is connected, model is that the pin 32 of the dialer module U9 of TC35i is connected with resistance R 13 one end electric wires, the base stage electric wire of the triode Q4 that the other end of resistance R 13 is NPN with model is connected, the negative pole end ground connection of capacitor C 14, positive terminal is connected with port 2 electric wires of common SIM card U10, model is the grounded emitter of the triode Q4 of NPN, and collector is connected with the negative pole of diode (LED) 1, and the positive pole of diode (LED) 1 is connected with one end electric wire of resistance R 12, and the direct supply VCC electric wire that the other end of resistance R 12 is 5V with output valve is connected.

No. 5 signal amplification circuits described in technical scheme comprise that model is NPN triode Q2, the resistance R 2 of s8050.Model is the grounded emitter of the NPN triode Q2 of s8050, base stage is connected with one end electric wire of resistance R 2, the other end of resistance R 2 is connected with the pin P2.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), the collector electric wire of the triode Q2 that model is the diode of IN4148 is NPN with one end after relay U6 parallel connection with model is connected, to be the diode of IN4148 be connected with the direct supply electric wire of+12V with the other end after relay U6 parallel connection model, relay U6 one end is connected with the direct supply electric wire of+12V, the other end of relay U6 is connected with one end electric wire of two twinkle SM signal lamp Light, two twinkle SM signal lamp Light other end ground connection.

Compared with prior art the invention has the beneficial effects as follows:

1. of the present inventionly based on pressure sensing child, be set to early warning system in car and differentiate by the mode of pressure transducer and Thermoelectric Infrared Sensor combination, voluntarily life entity situation in the car after stopping is detected, without driver, manually operate, realized the precision and the intellectuality that detect.

2. of the present inventionly based on pressure sensing child, being set in car early warning system and adopting three kinds of type of alarms, is first that the hummer of driver while just having stood up to get off reminded.Secondly on performance element, set up timekeeping system, if car owner does not return in the safe time limit arranging, the dialer of force start based on global system for mobile communications network and two twinkle SM signal lamp are reported to the police, and have improved security performance.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention is further illustrated:

Fig. 1 is the structured flowchart that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-a is system enable detection unit and the ECU (Electrical Control Unit) connection diagram that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-b is pressure transducer and the ECU (Electrical Control Unit) connection diagram that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-c is Thermoelectric Infrared Sensor and the ECU (Electrical Control Unit) connection diagram that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-d is the hummer control circuit connection diagram that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-e is the dialer control circuit connection diagram based on global system for mobile communications network that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 2-f is the two glitch lamp control circuit connection diagrams that are set to early warning system in car based on pressure sensing child of the present invention;

Fig. 3 is that the pressure transducer that is set to early warning system in car based on pressure sensing child of the present invention is at single locational layout schematic diagram;

Fig. 4 is the ECU (Electrical Control Unit) structured flowchart that is set to early warning system in car based on pressure sensing child of the present invention;

Fig. 5 is of the present inventionly set to the ECU (Electrical Control Unit) power module circuitry figure in early warning system in car based on pressure sensing child;

Fig. 6-1 is set to the system enable detection of early warning system in car and the FB(flow block) that child is set to detecting unit subroutine in car for of the present invention based on pressure sensing child;

Fig. 6-2 are the FB(flow block) that is set to the execution subroutine in early warning system in car based on pressure sensing child of the present invention;

In figure: R1～R13. resistance, RF. variable resistor, C1～C14. electric capacity, Q1～Q4. triode, diode (LED) 1, two flashing light Light, inductance L 1.

Embodiment

Below in conjunction with accompanying drawing, the present invention is explained in detail:

Innovative point of the present invention is whether having double check, the judgement of life entity in car, and taked necessary alarm measure, and equipment is simple, and cost is lower, and feasibility and operability are stronger.The present invention is applicable to average family car and school bus etc., to improving the children's ride-on of automobile, has safely vital role.

Consult Fig. 1, of the present inventionly based on pressure sensing child, be set in car early warning system and mainly by system enable detection unit, child, be set to detecting unit in car, ECU (Electrical Control Unit) and performance element etc. and form.Wherein child is set to detecting unit in car and includes 9 pressure transducers and Thermoelectric Infrared Sensor, and performance element includes hummer, two twinkle SM signal lamp, the dialer based on global system for mobile communications network.

One. system enable detection unit

Consult Fig. 2-a, the diode that described system enable detection unit is IN4148 by snap switch K, model forms.To be the diode of IN4148 be connected with one end electric wire of snap switch K with the one end after the control system parallel connection of relay U12 in ECU (Electrical Control Unit) model, the other end ground connection of snap switch K, the other end after the control system parallel connection of the diode that model is IN4148 and relay U12 in ECU (Electrical Control Unit) is connected with the direct supply electric wire of+12V.The ECU (Electrical Control Unit) power module electric wire by the ECU (Electrical Control Unit) of control system one end and can provide+5V of relay U12 in ECU (Electrical Control Unit) is connected, and the other end is connected with the microcontroller power supply pin VCC electric wire in ECU (Electrical Control Unit).

After car owner extracts key, snap switch K is closed, the control system place circuit of relay U12 in ECU (Electrical Control Unit) is connected, relay U12 after circuit connection in ECU (Electrical Control Unit) is connected the connecting circuit of the single-chip microcomputer in the ECU (Electrical Control Unit) power module in ECU (Electrical Control Unit) and ECU (Electrical Control Unit) by control system, makes the single-chip microcomputer supply+5V DC voltage in the ECU (Electrical Control Unit) electric power source pair of module ECU (Electrical Control Unit) in ECU (Electrical Control Unit).When ECU (Electrical Control Unit) starts, start other unit that judgement is set to in-vehicle alarm system based on pressure sensing child and whether should start.

Two. child is set to detecting unit in car

Consult Fig. 2-b and Fig. 2-c, described child is set to detecting unit in car and is comprised of 9 pressure transducer U3, No. 1 signal amplification circuit, Thermoelectric Infrared Sensor and No. 2 signal amplification circuits.

1. pressure transducer

Consult Fig. 2-b, described pressure transducer U3 is tekscan

the sensor of Sensors A201.This pressure transducer U3 can be more accurate the object of sense weight in 45kg, can reach the object that detects child, and this pressure transducer U3 susceptibility is good, can meet the requirement of accurate detection of dynamic.To be that a component is loose be arranged on a seat of automobile rear every three pressure transducer U3.Mounting means is consulted Fig. 3, circle shown in figure on seat represents pressure transducer U3, three pressure transducer U3 that structure is identical are installed on each seat, 3 pressure transducer U3 of first group are called No. 1 pressure transducer U3, No. 2 pressure transducer U3, No. 3 pressure transducer U3, shape triangular in shape, prevent the erroneous judgement causing because of child's shift in position, improved the accuracy and the reliability that detect.

No. 1 signal amplification circuit (by No. 1 identical pressure sensor circuit of structure, No. 2 pressure sensor circuits, No. 3 pressure sensor circuits ... form with No. 9 pressure sensor circuits) comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, capacitor C 4, the capacitor C 5 that model is TPS60400.

No. 1 pressure sensor circuit of take in figure is the connected mode of example explanation pressure transducer U3 with ECU (Electrical Control Unit): the transistorized cathode voltage input port 2 that model is MCP6004-E/P is connected with a port electric wire of No. 1 pressure transducer U3, and the transistorized cathode voltage input port 3 that model is MCP6004-E/P is connected with earth terminal GND electric wire.Model is that the transistorized cathode voltage input port 2 of MCP6004-E/P is connected with one end electric wire of variable resistor RF, transistorized Voltage-output port 1 electric wire that the other end of variable resistor RF is MCP6004-E/P with model is connected, and above formation sign-changing amplifier can amplify the voltage signal of pressure transducer U3.One end electric wire of the voltage stabilizing diode that another port of No. 1 pressure transducer U3 is IN4370 with model is connected, and output port 1 electric wire of the charge pump U5 that the other end of the voltage stabilizing diode that model is IN4370 is TPS60400 with model is connected, the while is connected with the positive terminal electric wire of the capacitor C 3 of one end ground connection.Model is that the direct supply electric wire that the input port 2 of the charge pump U5 of TPS60400 is 5V with output valve is connected, and the while is connected with the positive terminal electric wire of the capacitor C 4 of one end ground connection.Model is that the port 4 of the charge pump U5 of TPS60400 is connected with earth terminal GND electric wire, and the port 5 of the charge pump U5 that model is TPS60400 is that port Cfly+ is that port Cfly-electric wire is connected with self port 3 after capacitor C 5.Model is that the input port AIN0 electric wire of the transistorized Voltage-output port 1 of the MCP6004-E/P modulus conversion chip U1 that is TCL2543 with No. 1 model is connected.

By above-mentioned the same manner, connect into respectively No. 2 pressure sensor circuits and No. 3 pressure sensor circuits, No. 2 pressure sensor circuits and No. 3 pressure sensor circuits are identical with the structure of No. 1 pressure sensor circuit, all comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, capacitor C 4, the capacitor C 5 that model is TPS60400.The three cover pressure sensor circuits that are connected respectively with No. 1 pressure transducer U3, No. 2 pressure transducer U3, No. 3 pressure transducer U3 form one group of pressure sensor circuit altogether, and the modulus conversion chip U1 that is TCL2543 with No. 1 model is connected.Wherein: the input port AIN0 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model is MCP6004-E/P is TCL2543 with No. 1 model is connected.The input port AIN1 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model in No. 2 pressure sensor circuits that are connected with No. 2 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 1 model is connected.The input port AIN2 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model in No. 3 pressure sensor circuits that are connected with No. 3 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 1 model is connected.

Model is that the port CS of No. 1 modulus conversion chip U1 and the pin P1.0 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) of TCL2543 is connected.Model is port one 0 and port one 3 ground connection of No. 1 modulus conversion chip U1 of TCL2543, and the port one 4 of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with vehicle-mounted+5V direct supply with port 20.The port I/O CLOCK of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.3 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit).

6 pressure transducer U3 of other 2 groups that child is set to detecting unit in car are called No. 4 pressure transducer U3, No. 5 pressure transducer U3, No. 6 pressure transducer U3, No. 7 pressure transducer U3, No. 8 pressure transducer U3, No. 9 pressure transducer U3.

The associated component being connected respectively with No. 4 pressure transducer U3, No. 5 pressure transducer U3, No. 6 pressure transducer U3 is by the three cover pressure sensor circuits i.e. No. 4 pressure sensor circuits, No. 5 pressure sensor circuits and No. 6 pressure sensor circuits that connect into second group shown in mentioned above and Fig. 2-b.No. 4 pressure sensor circuits, No. 5 pressure sensor circuits are identical with the structure of No. 6 pressure sensor circuits, all comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, capacitor C 4, the capacitor C 5 that model is TPS60400.The modulus conversion chip U1 that the three cover pressure sensor circuits of second group are TCL2543 with No. 2 models is connected.Wherein: the input port AIN0 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that the model in No. 4 pressure sensor circuits that are connected with No. 4 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 2 models is connected.The input port AIN1 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that the model being connected with No. 5 pressure transducer U3 in No. 5 pressure sensor circuits is MCP6004-E/P is TCL2543 with No. 2 models is connected.The input port AIN2 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model in No. 6 pressure sensor circuits that are connected with No. 6 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 2 models is connected.The port CS of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.0 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit).The port I/O CLOCK of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of No. 2 modulus conversion chip U1 that model is TCL2543 is connected with the pin P0.3 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit).

The associated component being connected respectively with No. 7 pressure transducer U3, No. 8 pressure transducer U3, No. 9 pressure transducer U3 is by the three cover pressure sensor circuits i.e. No. 7 pressure sensor circuits, No. 8 pressure sensor circuits and No. 9 pressure sensor circuits that connect into respectively the 3rd group shown in mentioned above and Fig. 2-b.No. 7 pressure sensor circuits, No. 8 pressure sensor circuits are identical with the structure of No. 9 pressure sensor circuits, all comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, capacitor C 4, the capacitor C 5 that model is TPS60400.The modulus conversion chip U1 that the three cover pressure sensor circuits of the 3rd group are TCL2543 with No. 3 models is connected.Wherein: the input port AIN0 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that the model in No. 7 pressure sensor circuits that are connected with No. 7 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 3 models is connected.The input port AIN1 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model in No. 8 pressure sensor circuits that are connected with No. 8 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 3 models is connected.The input port AIN2 electric wire of the modulus conversion chip U1 that the transistorized Voltage-output port 1 that model in No. 9 pressure sensor circuits that are connected with No. 9 pressure transducer U3 is MCP6004-E/P is TCL2543 with No. 3 models is connected.The port CS of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.4 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit).The port I/O CLOCK of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.5 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.6 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.7 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit).

Child is set to detecting unit in car and adopts the numerical value sum M of every group of 3 pressure transducer U3 to represent tested child's body weight, consults Fig. 6-1, M shown in figure ₀₁and M ₀₂represent respectively to have set, according to 2～18 years old children's body weight percentile curves figure of China can determine native system towards child's possible weight range.If the value of M, not within the scope of systemic presupposition, is of the present inventionly set to early warning system in car based on pressure sensing child and automatically resets and close.If the value of M meets the scope of systemic presupposition, every 0.5s carries out one-time detection instruction again, repeatedly carries out 3 times.If 3 times result all meets systemic presupposition scope, open Thermoelectric Infrared Sensor.

2. Thermoelectric Infrared Sensor

Consult Fig. 2-c, Thermoelectric Infrared Sensor U8 is a kind of new type of high sensitivity detecting element.Can be with variation the output electrical signals of the infrared energy of noncontact form human body radiation, whether outwards its effect is while having doubtful child's weight in pressure transducer judges car, to detect this weight radiations heat energy, and then determines whether life entity.

No. 2 signal amplification circuits comprise that model is NPN triode Q3, resistance R 3, resistance R 4, capacitor C 6, the capacitor C 7 of s8050.

Shown in Fig. 2-c, be the annexation of Thermoelectric Infrared Sensor U8 of the present invention with No. 2 signal amplification circuits and ECU (Electrical Control Unit): the NPN triode Q3 that model is s8050, resistance R 3 and resistance R 4 formation amplifying circuits.The direct supply VCC electric wire that the input port 3 of Thermoelectric Infrared Sensor U8 and output valve are+5V is connected, the input port 2 of Thermoelectric Infrared Sensor U8 is connected with capacitor C 7 electric wires, the other end while of capacitor C 7 is connected with the base stage electric wire of the NPN triode Q3 that the resistance R 4 in amplifying circuit is s8050 with model, and the direct supply VCC that the other end of resistance R 4 is 5V with output valve simultaneously and one end electric wire of resistance R 3 are connected.The other end of the resistance R 3 in amplifying circuit is connected with capacitor C 6 electric wires, and the input port 3 of the modulus conversion chip U7 that the other end of capacitor C 6 is ADC0832 with model is that analog input channel CH1 electric wire is connected; Model is that the collector electric wire of the NPN triode Q3 of s8050 is connected between resistance R 3 and capacitor C 6, and the emitter of the NPN triode Q3 that model is s8050 is connected with earth terminal GND electric wire.Model is that to be port CS be connected with the pin P3.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) the port one of the modulus conversion chip U7 of ADC0832.Model is that the port 2 of modulus conversion chip U7 of ADC0832 is vacant, port 4 ground connection.Model is that the port 5 of the modulus conversion chip U7 of ADC0832 is that port DI is data-signal input port, and port 6 is that port DO is data-signal output port, and both are connected with the pin P3.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) simultaneously.Model is that the port 7 of the modulus conversion chip U7 of ADC0832 is that port CLK is control chip input end of clock mouth, is connected with the pin P3.4 electric wire of single-chip microcomputer in ECU (Electrical Control Unit).Model is that to be port VCC be connected with the direct supply electric wire of+5V the port 8 of the modulus conversion chip U7 of ADC0832.

The double check of 9 pressure transducer U3 and Thermoelectric Infrared Sensor U8 has accuracy and reliability significantly.When the signal detecting as Thermoelectric Infrared Sensor U8 does not meet preset range, of the present inventionly based on pressure sensing child, be set to early warning system in car and automatically close.If signal meets preset range, judge the children that truly having in car passes into silence and performance element is opened.

Three. performance element

Described performance element is comprised of hummer, two twinkle SM signal lamp, dialer (GSM dialer), No. 3 signal amplification circuits, No. 4 signal amplification circuits and No. 5 signal amplification circuits based on global system for mobile communications (Global System of Mobile communication is GSM) network.Consulting Fig. 6-2, is the workflow block diagram of performance element shown in figure.

1. hummer

Consult Fig. 2-d, the hummer of described performance element is common active buzzer U4.

No. 3 signal amplification circuits comprise that model is NPN triode Q1, the resistance R 1 of s8050.

The annexation of diagram hummer U4 and ECU (Electrical Control Unit) is: the grounded emitter of the NPN triode Q1 that model is s8050, model is that the base stage of the NPN triode Q1 of s8050 is connected with resistance R 1 electric wire, resistance R 1 other end is connected with the pin P1.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), model is that the collector of the NPN triode Q1 of s8050 is connected with one end electric wire of (BUZZER) hummer U4, and the other end of hummer (BUZZER) U4 is connected with the positive electrical wire of+5V direct supply.

Hummer shown in figure is arranged near operating seat.Its effect be judgement in car truly have the children that pass into silence time, when driver leaves automobile, carry out in time warning reminding, Accident prevention occurs.When hummer is opened, start timing, after 2 minutes, restart pressure transducer, obtain quality state amount M.When M value is within possible error range, while being not more than preset value Kid.Can think that child is out of danger, of the present inventionly based on child, be set to early warning system in car and automatically reset and close.When M value is greater than limit of error value, think that child still in car, need to further remind car owner by the dialer based on global system for mobile communications network, remove in time child's danger.

2. the dialer based on global system for mobile communications network

Consult Fig. 2-e, the described dialer based on global system for mobile communications network (GSM) comprises that model is the dialer module U9 of TC35i, common SIM card U10.

No. 4 signal amplification circuits comprise that model is the NPN triode Q4 of s8050, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, capacitor C 8, capacitor C 9, capacitor C 10, capacitor C 11, capacitor C 12, capacitor C 13, capacitor C 14, LED 1.

Dialer and the ECU (Electrical Control Unit) annexation of diagram based on global system for mobile communications network is: the pin 1 of the dialer module U9 that model is TC35i, pin 2, pin 3, pin 4, electrochemical capacitor C8 after pin 5 is in parallel simultaneously and after parallel connection, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the positive electrical wire of electrochemical capacitor C13 is connected, electrochemical capacitor C8, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the positive electrical wire of electrochemical capacitor C13 is connected, the other end of electric capacity (negative pole) ground connection, the output terminal (positive terminal) of the anodal while of electrochemical capacitor C13 as electrochemical capacitor group is connected with one end electric wire of resistance R 5, the direct supply VCC electric wire that the other end of resistance R 5 and output valve are+5V is connected.Model is pin 6, pin 7, pin 8, pin 9, pin 10 rear being connected with the negative pole end of capacitor C 13 and ground connection in parallel of the dialer module U9 of TC35i.Model is that the pin 15 of the dialer module U9 of TC35i is connected with one end electric wire of resistance R 6 and resistance R 9 simultaneously, and resistance R 6 other ends are connected with the single-chip microcomputer pin P2.0 electric wire in ECU (Electrical Control Unit), resistance R 9 other end ground connection.Model is that the pin 18 of the dialer module U9 of TC35i is connected with single-chip microcomputer pin P3.0 electric wire.Model is that the pin 19 of the dialer module U9 of TC35i is connected with resistance R 10 with resistance R 7 simultaneously, and resistance R 7 other ends are connected with single-chip microcomputer pin P3.1 electric wire, resistance R 10 other end ground connection.Model is that the pin 20 of the dialer module U9 of TC35i is connected with single-chip microcomputer pin P2.1 electric wire.Model is that the pin 21 of the dialer module U9 of TC35i is connected with resistance R 11 electric wires with resistance R 8 simultaneously, and resistance R 8 other ends are connected with single-chip microcomputer pin P2.2 electric wire, resistance R 11 other end ground connection.Model is that pin 24 and the pin 28 of dialer module U9 of TC35i is that port VCC electric wire is connected with the port 2 of common SIM card U10 after in parallel, model is that the pin 25 of dialer module U9 and the port 4 of common SIM card U10 of TC35i is that port RST is connected, model is that the pin 26 of dialer module U9 and the port 5 of common SIM card U10 of TC35i is that port I/O electric wire is connected, model is that the pin 27 of dialer module U9 and the port 6 of common SIM card U10 of TC35i is that port CLK electric wire is connected, model is that the pin 29 of the dialer module U9 of TC35i is that port GND is connected with the port one of common SIM card U10.Model is that the pin 32 of the dialer module U9 of TC35i is connected with resistance R 13 one end electric wires.The base stage electric wire of the triode Q4 that the other end of resistance R 13 is NPN with model is connected.One end of capacitor C 14 (negative pole end) ground connection, the other end (positive terminal) is port with the port 2(of common SIM card U10) VCC electric wire is connected.The port 3 of common SIM card U10 is that port NC is vacant.Model is the grounded emitter of the triode Q4 of NPN, and collector is connected with the negative pole of diode (LED) 1, and the positive pole of diode (LED) 1 is connected with one end electric wire of resistance R 12, and the direct supply VCC electric wire that the other end of resistance R 12 and output valve are+5V is connected.

The described dialer based on global system for mobile communications network (GSM) is existing shaped article at present, domestic brought into use based on global system for mobile communications network dial device have the A2D series of Falcom, the WMO2 of Wavecome series, the TC35 series of Siemens, the DM10/DM20 series of Ericsson, in emerging ZXGM18 series etc., and the function of these modules, usage difference are little.Wherein the TC35 series module cost performance of Siemens is very high, and has had domestic wireless device networking card.So that the design selects is the TC35i of Siemens TC35 series.TC35i is the up-to-date wireless product that Siemens releases, compatible, compact to design with TC35 in function, has greatly dwindled the volume of consumer products.And be easy to upgrade to GPRS module.This module integrates radio circuit and base band, and the AT command interface of standard is provided to user, for data, voice, short message and fax provide quick, reliable, safe transmission, and user friendly application and development and design.

Dialer based on global system for mobile communications network (GSM) is arranged under assistant driver seat, its effect is to ring children's danger in rear car while not removing yet at judgement hummer, to the driver who leaves automobile, send reminding short message, prevent that tragedy accident from occurring.Hummer rings after 2 minutes and sends note for the first time, later at interval of a reminding short message of transmission in 5 minutes.If car owner comes back within 20 minutes, ECU (Electrical Control Unit) is closed, and can think that child has departed from possible danger.If still reactionless after 20 minutes, think that child still in car, may produce danger, need to near pedestrian, wait and carry out warning reminding by two twinkle SM signal lamps, remove in time child's danger.

3. pair twinkle SM signal lamp

Consult Fig. 2-f, the two twinkle SM signal lamps shown in figure are the basic configuration of automobile own.Control circuit is modified on the circuit of automobile own.Amended circuit comprises that model is diode and relay U6, the two twinkle SM signal lamp Light of IN4148.

No. 5 signal amplification circuits comprise that model is NPN triode Q2, the resistance R 2 of s8050.

The two twinkle SM signal lamps of diagram are as follows with ECU (Electrical Control Unit) connected mode: the collector electric wire of the NPN triode Q2 that the one end after the control system parallel connection of the diode that model is IN4148 and relay U6 is s8050 with model is connected, and the other end after the control system parallel connection of the diode that model is IN4148 and relay U6 is connected with the direct supply electric wire of+12V.Relay U6 is connected with the direct supply electric wire of+12V by control system one end, and the other end is connected with one end electric wire of two twinkle SM signal lamp Light, two twinkle SM signal lamp Light other end ground connection.Model is the grounded emitter of the NPN triode Q2 of s8050, and base stage is connected with one end electric wire of resistance R 2.The other end of resistance R 2 is connected with the pin P2.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit).Relay U6 in two glitch lamp control circuits controls the switching of two twinkle SM signal lamp Light, its effect is that car owner does not come back and takes measures on customs clearance after confirm sending note, when the children's danger in car is not removed yet, to the pedestrian of the vehicle periphery signal that gives the alarm, prevent that tragedy accident from occurring.

Four. ECU (Electrical Control Unit)

Consult Fig. 4, the modulus conversion chip U1(that described ECU (Electrical Control Unit) is TLC2543 by single-chip microcomputer, ECU (Electrical Control Unit) power module, model comprises the modulus conversion chip U1 that modulus conversion chip U1 that modulus conversion chip U1 that No. 1 model is TCL2543, No. 2 models are TCL2543, No. 3 models are TCL2543), model is ADC0832 modulus conversion chip U7, relay U12 form.

Single-chip microcomputer in described ECU (Electrical Control Unit) is the electronic installation that the self-editing computer program of realizing the interior child of inspection vehicle and the prompting that gives the alarm is housed, and described computer program comprises that system enable detection and child are set to detecting unit subroutine, execution subroutine in car.ECU (Electrical Control Unit) has been implemented the function of computer program, makes to be set to early warning system in car based on pressure sensing children and can realize child and the correlation functions such as prompting that give the alarm in inspection vehicle.

The modulus conversion chip U7 supply+5V DC voltage that the modulus conversion chip U1 that ECU (Electrical Control Unit) power module is TLC2543 to model respectively and model are ADC0832.The core of ECU (Electrical Control Unit) is single-chip microcomputer, and the pin VCC of single-chip microcomputer is connected with the system wires of being controlled of relay U12, and relay U12 is connected with ECU (Electrical Control Unit) power module electric wire by the other end of control system.The control system of relay U12 is connected with the output terminal electric wire in enable detection unit, and enable detection unit controls relay U12 is by the break-make of control system place circuit, and when circuit is connected, ECU (Electrical Control Unit) power module is to single-chip microcomputer supply+5V DC voltage.

Consult Fig. 2-b, the signal output part of each pressure transducer U3 is connected with transistorized cathode voltage input port 2 electric wires that model in No. 1 signal amplification circuit (i.e. 1 to No. 9 pressure sensor circuit) is MCP6004-E/P, model is the input port AINX electric wire of the transistorized Voltage-output port 1 of the MCP6004-E/P modulus conversion chip U1 that is TCL2543 with 1 to No. 3 model (X=0 that is connected, 1,2).When each pressure transducer U3 is No. 1 pressure transducer U3 of first group, No. 2 pressure transducer U3, No. 3 pressure transducer U3, the other end of the modulus conversion chip U1 that No. 1 model is TLC2543 is connected with single-chip microcomputer pin P1.0, P1.1, P1.2, P1.3.When each pressure transducer U3 is No. 4 pressure transducer U3, No. 5 pressure transducer U3, No. 6 pressure transducer U3, the other end of the modulus conversion chip U1 that No. 2 models are TLC2543 is connected with single-chip microcomputer pin P0.0, P0.1, P0.2, P0.3.When each pressure transducer U3 is No. 7 pressure transducer U3, No. 8 pressure transducer U3, No. 9 pressure transducer U3, the other end of the modulus conversion chip U1 that No. 3 models are TLC2543 is connected with single-chip microcomputer pin P0.4, P0.5, P0.6, P0.7 electric wire.

Consult Fig. 2-c, to be port OUT be connected with one end electric wire of electrochemical capacitor C7 in No. 2 signal amplification circuits the signal output port 2 of Thermoelectric Infrared Sensor U8, the port 3 of the modulus conversion chip U7 that No. 2 signal amplification circuit other ends are ADC0832 with model is that port CHI electric wire is connected, and the modulus conversion chip U7 other end that model is ADC0832 is that port CLK is connected with the pin P3.4 electric wire of single-chip microcomputer.

Consult Fig. 2-d, the signal input port of hummer U4 is connected with the collector electric wire of the NPN triode Q1 that model in No. 3 signal amplification circuits is s8050, and the other end of No. 3 signal amplification circuits is connected with the pin P1.5 electric wire of single-chip microcomputer.

Consult Fig. 2-e, the signal input pin 20 of the dialer U9 based on global system for mobile communications network is connected with single-chip microcomputer pin P2.1 electric wire, and pin 18 is connected with single-chip microcomputer pin P3.0 electric wire.Pin 15, pin 19, pin 21 are connected with No. 4 signal amplification circuit electric wires respectively.The other end of No. 4 signal amplification circuits is connected with single-chip microcomputer pin P2.0, pin P3.1, pin P2.2 electric wire.

Consult Fig. 2-f, the collector electric wire of the triode Q2 that the signal input port of two twinkle SM signal lamps is NPN with model in No. 5 signal amplification circuits is connected.The other end of No. 5 signal amplification circuits is connected with the pin P2.3 electric wire of single-chip microcomputer.

1. single-chip microcomputer

Of the present inventionly based on pressure sensing child, be set to early warning system in car and adopt the single-chip microcomputer that model is STC89C51, be arranged on operating seat below, the STC series monolithic adopting is the single-chip microcomputer of a kind of novel 51 kernels of the up-to-date release of U.S. STC Corporation.Model be the single-chip microcomputer of STC89c51 contain Flash program storage, SRAM, UART, SPI, A the module such as D, PWM.

Consult Fig. 6-1, it is as follows that system enable detection unit and child are set to the interior detecting unit subroutine flow process of car:

After car owner extracts key, ECU (Electrical Control Unit) power module is to the circuit communication of single-chip microcomputer power supply, and ECU (Electrical Control Unit) starts.

Each pressure transducer U3 starts detected pressures, system counts i=1 now, and three pressure transducer U3 detect respectively and obtain three data M ₁, M ₂, M ₃, and three data are added and obtain general pressure value M, judge that whether M is at preset value M ₀₁with M ₀₂(M ₀₁with M ₀₂maximum, minimum pressure reference quantity that to be user set in advance according to the age of detected object and body weight) between, if not judge that this weight is not children, system finishing process enters holding state; If other three data m again detected after 0.5 second ₁, m ₂, m ₃, carry out respectively M ₁-m ₁, M ₂-m ₂, M ₃-m ₃, judge whether three pressure difference values of gained are less than error permissible value Δ.If be greater than error permissible value, illustrate that this weight is children, start performance element; If be less than error permissible value, make i=i+1, and the step that repeats described detected pressures is above until variable i is greater than 3.

If above-mentioned trace routine gained pressure difference value is less than error permissible value all the time, still can not accurately judge whether this weight is children, next should open Thermoelectric Infrared Sensor, obtain quantity of state T, if T=0 illustrates the heat that this weight distributes and does not belong in the scope of life entity distribute heat, be not children, system finishing process enters holding state; If it is children that T is not equal to 0 this weight of explanation, start performance element.

Consult Fig. 6-2, of the present invention based on pressure sensing child, to be set to the execution subroutine flow process in early warning system in car as follows: receive after the signal that single-chip microcomputer sends that hummer starts and timer starts timing, after 2 minutes, start each pressure transducer U3 detected pressures and obtain general pressure value M, judging whether M is less than preset value M ₀₁(minimum pressure reference quantity), if M is less than M ₀₁illustrate that children are removed, native system finishes process and enters holding state; If M is greater than M ₀₁illustrate that children still on the seat, system counts initial value P=1 is set, timer timing also starts the dialer (GSM dialer) based on global system for mobile communications network, during this time each pressure transducer U3 continue to detect time delay after 5 minutes counting variable P add 1, and repeat dialing with the step of pressure detection until P is greater than 4.

If said procedure is carried out rear system, do not stop yet illustrating children still on the seat, now open two twinkle SM signal lamps continuous firing, each pressure transducer U3 constantly detects simultaneously, judges whether general pressure value M belongs to children's weight range, until M is less than M ₀₁, illustrate that children are removed, close two twinkle SM signal lamps, system finishing process enters holding state.

2. ECU (Electrical Control Unit) power module

Consult Fig. 5, controller power source module of the present invention comprises switching mode voltage stabilizing chip U11, diode IN5822, capacitor C 15, C16, inductance L 1.

Described switching mode voltage stabilizing chip U11 is that model is the chip of LM2576; LM2576 series is the 3A electric current output buck switching mode chip that National Semiconductor produces; it includes fixed oscillator (52kHz) and benchmark voltage stabilizer (1.23V); and there is perfect holding circuit; comprise current limit and hot breaking circuit etc., utilize this device only to need few peripheral components just can form efficient mu balanced circuit.LM2576 series comprises LM2576 (maximum input voltage 40V) and two series of LM2576HV (maximum input voltage 60V).Each series of products all provide a plurality of voltage class products such as 3.3V (3.3), 5V (5.0), 12V (12), 15V (15) and adjustable (ADJ).In addition, this chip also provides the external control pin of duty.

The vehicle power electric wire that the maximum voltage input port 1 of switching mode voltage stabilizing chip U11 is port Vin is+12V with output valve is connected, the output port 2 of switching mode voltage stabilizing chip U11 is that port OUTPUT is connected with diode IN5822 electric wire, is connected with one end electric wire of inductance L 1 simultaneously.The other end of diode IN5822 is connected with the negative pole end of capacitor C 16 and ground connection simultaneously, and the other end output voltage values of inductance L 1 is+burning voltage of 5V.The port 3 of switching mode voltage stabilizing chip U11 is that port GND is connected with the negative pole end electric wire of capacitor C 15 and ground connection simultaneously, and the positive terminal of capacitor C 15 with output valve is+and the vehicle power electric wire of 12V is connected.The port 4 of switching mode voltage stabilizing chip U11 is that port FEEDBACK is connected with the positive terminal electric wire of capacitor C 16.The port 5 of switching mode voltage stabilizing chip U11 is port ON/OFF ground connection.

3. the modulus conversion chip that model is TLC2543

The modulus conversion chip U1 that the model that native system adopts is TLC2543 is 12 analog to digital converters of 11 input ends, has the advantages such as conversion is fast, good stability, simple with Microprocessor Interface, price is low.It is a kind of multichannel A/D converter with Serial Peripheral Interface (SPI).

The model that native system adopts is that the interlock circuit of the modulus conversion chip U1 of TLC2543 connects and can consult Fig. 2-a and the related Sections of described pressure transducer U3 above.

4. the modulus conversion chip that model is ADC0832

A kind of 8 bit resolutions, double channel A/D conversion chip that the modulus conversion chip U7Shi National Semiconductor that the model that native system adopts is ADC0832 produces, it reaches as high as 256 grades, can adapt to general analog quantity conversion requirement.Its internal electric source input is multiplexing with reference voltage, makes the analog voltage input of chip between 0～5V.Chip switching time is only 32 μ S, and according to there being Double Data output to can be used as data check, to reduce data error, slewing rate is fast and stability is strong.Independently chip enable input, articulates with processor many devices and controls become convenient.By DI data input pin, can realize easily the selection of channel function.

The model that native system adopts is that the interlock circuit of the modulus conversion chip U7 of ADC0832 connects and can consult Fig. 2-b and described Thermoelectric Infrared Sensor U8 related Sections above.

Each designed signal amplification circuit of native system connect can consult Fig. 2-a to Fig. 2-e and above described child be set to detecting unit and performance element related Sections in car.

Based on pressure sensing child, be set in car the principle of work of early warning system as follows:

Consult Fig. 1, the present invention's ECU (Electrical Control Unit) when car owner pulls up car key and prepares to get off starts, and makes child be set to detecting unit in car and start after ECU (Electrical Control Unit) self check non-fault.Child is set to after the interior detecting unit startup of car, 9 pressure transducer U3 detect on corresponding seat, whether there be the weight of force value in setting range automatically, if there is the weight of the dynamic change of force value in setting range, signal feedback, to ECU (Electrical Control Unit), starts performance element; If have the weight of force value in setting range but start Thermoelectric Infrared Sensor without dynamic change and further judge whether it is life entity.If judged on seat, have life entity to exist, signal feedback is to the single-chip microcomputer of ECU (Electrical Control Unit), and single-chip microcomputer starts performance element.First performance element sends alarm signal by hummer after starting in time.If car owner does not take measures, start timing, timing surpassed after the time of setting, and the dialer that single-chip microcomputer is controlled again based on global system for mobile communications network sends an SOS and reminds car owner's mobile phone.If car owner's Single-chip Controlling vehicle self of not taking measures yet is opened two twinkle SM signal lamps and is sent an SOS towards periphery after repeatedly reminding.

Claims (8)

1. based on pressure sensing child, be set to an early warning system in car, it is characterized in that, described based on pressure sensing child, be set in car early warning system and by system enable detection unit, child, be set to detecting unit in car, ECU (Electrical Control Unit) and performance element and form;

Modulus conversion chip U7, relay U12 that the modulus conversion chip U1 that described ECU (Electrical Control Unit) is TCL2543 by single-chip microcomputer, ECU (Electrical Control Unit) power module, model, model are ADC0832 form;

ECU (Electrical Control Unit) power module+input port 3 of modulus conversion chip U7 and the system wires of being controlled of relay U12 that the port one 4 of the modulus conversion chip U1 that 5V output terminal is TCL2543 with model and port 20, model are ADC0832 be connected, and relay U12 is connected with the pin VCC electric wire of single-chip microcomputer by the other end of control system;

Model is that the port CLK of modulus conversion chip U7 and the pin P3.4 electric wire of single-chip microcomputer of ADC0832 is connected, and the port DO of the modulus conversion chip U7 that model is ADC0832 is connected with the pin P3.3 electric wire of single-chip microcomputer with port DI is same; Model is that the modulus conversion chip U1 of TCL2543 is connected with single-chip microcomputer electric wire;

The output terminal of system enable detection unit is connected with the control system electric wire of the relay U12 in ECU (Electrical Control Unit); Input port AIN0, input port AIN1 that child is set in the modulus conversion chip U1 that detecting unit in car is TCL2543 by the output terminal of No. 1 signal amplification circuit with model in ECU (Electrical Control Unit) are connected with input port AIN2 electric wire, and the analog input channel CH1 electric wire that child is set to the modulus conversion chip U7 that the output terminal of the interior detecting unit of car by No. 2 signal amplification circuits is ADC0832 with model is connected; The input end of performance element by No. 3 signal amplification circuits is connected with the pin P1.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), performance element is connected with single-chip microcomputer pin P2.0, pin P3.0, pin P3.1, pin P2.1, pin P2.2 electric wire in ECU (Electrical Control Unit) by the input end of No. 4 signal amplification circuits, and performance element is connected with the pin P2.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit) by the input end of No. 5 signal amplification circuits.

2. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, the modulus conversion chip U1 that described model is TCL2543 comprises the modulus conversion chip U1 that modulus conversion chip U1 that modulus conversion chip U1 that No. 1 model is TCL2543, No. 2 models are TCL2543, No. 3 models are TCL2543;

The port I/O CLOCK of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 1 model is TCL2543 is connected with the pin P1.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of modulus conversion chip U1 and the pin P1.3 electric wire of single-chip microcomputer that No. 1 model is TCL2543 are connected;

The port I/O CLOCK of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.1 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 2 models are TCL2543 is connected with the pin P0.2 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of No. 2 modulus conversion chip U1 that model is TCL2543 is connected with the pin P0.3 electric wire of single-chip microcomputer;

The port I/O CLOCK of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.5 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), the port DATA INPUT of the modulus conversion chip U1 that No. 3 models are TCL2543 is connected with the pin P0.6 electric wire of the single-chip microcomputer in ECU (Electrical Control Unit), and the port DATA OUT of modulus conversion chip U1 and the pin P0.7 electric wire of single-chip microcomputer that No. 3 models are TCL2543 are connected.

3. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, described ECU (Electrical Control Unit) power module comprises switching mode voltage stabilizing chip U11, diode IN5822, capacitor C 15, C16, inductance L 1;

The vehicle power electric wire that the port Vin of switching mode voltage stabilizing chip U11 and output valve are+12V is connected, the port OUTPUT of switching mode voltage stabilizing chip U11 is connected with diode IN5822 electric wire, be connected with one end electric wire of inductance L 1 simultaneously, the other end of diode IN5822 is connected with the negative pole end of capacitor C 16 and while ground connection, the port GND of switching mode voltage stabilizing chip U11 is connected with the negative pole end electric wire of capacitor C 15 and while ground connection, the vehicle power electric wire that the positive terminal of capacitor C 15 and output valve are+12V is connected, the port FEEDBACK of switching mode voltage stabilizing chip U11 with and the positive terminal of capacitor C 16, the other end electric wire of inductance L 1 is connected and the output terminal of conduct+5V voltage, the port ON/OFF ground connection of switching mode voltage stabilizing chip U11.

4. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, described child is set to detecting unit in car and comprises 9 pressure transducer U3, No. 1 signal amplification circuit;

The structure of 9 described pressure transducer U3 is identical, all adopts tekscan the sensor of Sensors A201, every 3 pressure transducer U3 are on a seat that is arranged on dispersedly automobile rear of one group of shape triangular in shape, and 3 pressure transducer U3 of first group are called No. 1 pressure transducer U3, No. 2 pressure transducer U3, No. 3 pressure transducer U3; The 2nd group is called No. 4 pressure transducer U3, No. 5 pressure transducer U3, No. 6 pressure transducer U3, No. 7 pressure transducer U3, No. 8 pressure transducer U3 and No. 9 pressure transducer U3 with 6 pressure transducer U3 of the 3rd group;

No. 1 described signal amplification circuit by No. 1 pressure sensor circuit, No. 2 pressure sensor circuits, No. 3 pressure sensor circuits ... form with No. 9 pressure sensor circuits, No. 1 pressure sensor circuit, No. 2 pressure sensor circuits, No. 3 pressure sensor circuits ... identical with the structure of No. 9 pressure sensor circuits, all comprise that model is transistor, variable resistor RF, the model of the MCP6004-E/P voltage stabilizing diode that is IN4370, charge pump U5, capacitor C 3, the capacitor C 4 and capacitor C 5 that model is TPS60400;

Model is that the transistorized cathode voltage input port 2 of MCP6004-E/P and a port electric wire of No. 1 pressure transducer U3 are connected, model is that the transistorized cathode voltage input port 3 of MCP6004-E/P is connected with earth terminal GND electric wire, model is that the transistorized cathode voltage input port 2 of MCP6004-E/P is connected with one end electric wire of variable resistor RF, transistorized Voltage-output port 1 electric wire that the other end of variable resistor RF is MCP6004-E/P with model is connected, one end electric wire of the voltage stabilizing diode that another port of No. 1 pressure transducer U3 is IN4370 with model is connected, and output port 1 electric wire of the charge pump U5 that the other end of the voltage stabilizing diode that model is IN4370 is TPS60400 with model is connected, while is connected with the positive terminal electric wire of the capacitor C 3 of one end ground connection, model is that the direct supply electric wire that the input port 2 of the charge pump U5 of TPS60400 is 5V with output valve is connected, while is connected with the positive terminal electric wire of the capacitor C 4 of one end ground connection, model is that the port 4 of the charge pump U5 of TPS60400 is connected with earth terminal GND electric wire, model is that the port 5 of charge pump U5 of TPS60400 is connected with self port 3 electric wire after capacitor C 5, model is that the input port AIN0 electric wire of the transistorized Voltage-output port 1 of the MCP6004-E/P modulus conversion chip U1 that is TCL2543 with No. 1 model is connected, form pressure sensor circuit No. 1,

By above-mentioned the same manner, connect into respectively No. 2 pressure sensor circuits, No. 3 pressure sensor circuits and the 2nd group and No. 4 pressure sensor circuits of the 3rd group, No. 5 pressure sensor circuits, No. 6 pressure sensor circuits and No. 7 pressure sensor circuits, No. 8 pressure sensor circuits, No. 9 pressure sensor circuits.

5. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, described child is set to detecting unit in car and also comprises Thermoelectric Infrared Sensor U8 and No. 2 signal amplification circuits;

No. 2 signal amplification circuits comprise that model is NPN triode Q3, resistance R 3, resistance R 4, capacitor C 6, the capacitor C 7 of s8050;

The direct supply VCC electric wire that the input port 3 of Thermoelectric Infrared Sensor U8 is 5V with output valve is connected, the base stage electric wire of the NPN triode Q3 that 27 whiles of process capacitor C of input port of Thermoelectric Infrared Sensor U8 and one end of resistance R 4 are s8050 with model is connected, the direct supply VCC that the other end of resistance R 4 is 5V with output valve is simultaneously connected with one end electric wire of resistance R 3, and the other end process capacitor C 6 of resistance R 3 is connected with the analog input channel CH1 electric wire of the modulus conversion chip U7 that the model in ECU (Electrical Control Unit) is ADC0832; Model is that the collector electric wire of the NPN triode Q3 of s8050 is connected between resistance R 3 and capacitor C 6, and the emitter of the NPN triode Q3 that model is s8050 is connected with earth terminal GND electric wire.

6. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, No. 3 described signal amplification circuits comprise that model is NPN triode Q1, the resistance R 1 of s8050;

Model is the grounded emitter of the NPN triode Q1 of s8050, model is that the base stage of NPN triode Q1 and one end electric wire of resistance R 1 of s8050 is connected, the other end of resistance R 1 is connected with the pin P1.5 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), model is that the collector of NPN triode Q1 and one end electric wire of hummer U4 of s8050 is connected, and the other end of hummer U4 is connected with the positive electrical wire of 5V direct supply.

7. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, No. 4 described signal amplification circuits comprise that model is the NPN triode Q4 of s8050, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, capacitor C 8, capacitor C 9, capacitor C 10, capacitor C 11, capacitor C 12, capacitor C 13, capacitor C 14, LED 1;

Model is the pin 1 of the dialer module U9 of TC35i, pin 2, pin 3, pin 4, the pin 5 electrochemical capacitor C8 together and after parallel connection afterwards in parallel, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the positive electrical wire of electrochemical capacitor C13 connects, electrochemical capacitor C8, electrochemical capacitor C9, electrochemical capacitor C10, electrochemical capacitor C11, electrochemical capacitor C12, the negative electrical wire of electrochemical capacitor C13 connects, the negative pole end ground connection of capacitor C 13, as the positive terminal of electrochemical capacitor group and one end electric wire of resistance R 5, be connected simultaneously, the direct supply VCC electric wire that the other end of resistance R 5 is 5V with output valve is connected, model is the pin 6 of the dialer module U9 of TC35i, pin 7, pin 8, pin 9, after pin 10 is in parallel, be connected with the negative pole end electric wire of capacitor C 13 and ground connection, model is that the pin 15 of the dialer module U9 of TC35i is connected with one end electric wire of resistance R 6 and resistance R 9 simultaneously, resistance R 9 other end ground connection, model is that the pin 19 of the dialer module U9 of TC35i is connected with resistance R 10 with resistance R 7 simultaneously, resistance R 10 other end ground connection, the pin 20 of the dialer module U9 that model is TC35i is connected with single-chip microcomputer pin P2.1 electric wire.Model is that the pin 21 of the dialer module U9 of TC35i is connected with resistance R 11 electric wires with resistance R 8 simultaneously, resistance R 11 other end ground connection, model is that pin 24 and the pin 28 of dialer module U9 of TC35i is that port VCC electric wire is connected with the port 2 of common SIM card U10 after in parallel, model is that the pin 25 of dialer module U9 and port 4 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 26 of dialer module U9 and port 5 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 27 of dialer module U9 and port 6 electric wires of common SIM card U10 of TC35i are connected, model is that the pin 29 of dialer module U9 and the port one electric wire of common SIM card U10 of TC35i is connected, model is that the pin 32 of the dialer module U9 of TC35i is connected with resistance R 13 one end electric wires, the base stage electric wire of the triode Q4 that the other end of resistance R 13 is NPN with model is connected, the negative pole end ground connection of capacitor C 14, positive terminal is connected with port 2 electric wires of common SIM card U10, model is the grounded emitter of the triode Q4 of NPN, and collector is connected with the negative pole of diode (LED) 1, and the positive pole of diode (LED) 1 is connected with one end electric wire of resistance R 12, and the direct supply VCC electric wire that the other end of resistance R 12 is 5V with output valve is connected.

8. according to claimed in claim 1, based on pressure sensing child, be set to early warning system in car, it is characterized in that, No. 5 described signal amplification circuits comprise that model is NPN triode Q2, the resistance R 2 of s8050;

Model is the grounded emitter of the NPN triode Q2 of s8050, base stage is connected with one end electric wire of resistance R 2, the other end of resistance R 2 is connected with the pin P2.3 electric wire of single-chip microcomputer in ECU (Electrical Control Unit), the collector electric wire of the triode Q2 that model is the diode of IN4148 is NPN with one end after relay U6 parallel connection with model is connected, to be the diode of IN4148 be connected with the direct supply electric wire of+12V with the other end after relay U6 parallel connection model, relay U6 one end is connected with the direct supply electric wire of+12V, the other end of relay U6 is connected with one end electric wire of two twinkle SM signal lamp Light, two twinkle SM signal lamp Light other end ground connection.

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