CN210571946U

CN210571946U - Vehicle-mounted alcohol detection system

Info

Publication number: CN210571946U
Application number: CN201921596636.1U
Authority: CN
Inventors: 李江
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-05-19
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses an on-vehicle alcohol detecting system, including infrared detection device, signal processing apparatus and controlling means, infrared detection device includes the air chamber, infrared light source, photoelectric detector, exhale the pipeline and give vent to anger the pipeline, the air chamber level sets up in the steering wheel, exhale the pipeline and be linked together with the air chamber respectively with the pipeline of giving vent to anger, infrared light source and photoelectric detector set up both ends about in the air chamber respectively, and photoelectric detector's detection face sets up towards infrared light source, photoelectric detector links to each other with controlling means through signal processing apparatus, controlling means links to each other with infrared detection device, controlling means still links to each other with the braking system of car. The utility model discloses utilize the principle that different organic substances absorb the infrared ray wavelength difference, detect the alcohol concentration in the expired gas, sensitivity is high, and the work persistence is high, only detects the alcohol content in the expired gas and just can start the vehicle when no longer than the setting value to prevent the emergence that wine drove effectively.

Description

Vehicle-mounted alcohol detection system

Technical Field

The utility model relates to an alcohol check out test set field, concretely relates to on-vehicle alcohol detection device.

Background

In the investigation of traffic accidents, all countries in the world consider alcohol to be an important cause of traffic accidents, and when a traffic police drives after drinking, a hand-held alcohol detector is usually adopted to detect the alcohol content in the exhaled air of a driver and is used as the basis for investigation and treatment. Hand-held type alcohol detector mainly includes alcohol sensor and air pump, the air inlet of pipe connection air pump is passed through to the gas outlet of alcohol sensor, the air pump bleeds during the detection, the gas that enters into in the alcohol sensor gets into the air pump air inlet again through the gas outlet entering pipe of alcohol sensor under the air pump suction, it is gaseous to discharge by the air pump gas outlet after through the air pump is inside, the gas that enters into the alcohol sensor produces the signal of telecommunication after through chemical reaction, this signal of telecommunication carries out the calculation of alcohol concentration in getting into the singlechip after enlargiing and AD sampling circuit, show the calculated result on the display screen at last, traffic police carries out the punishment of different orders of magnitude according to this alcohol concentration value, come to carry out the driver.

It is necessary to prevent drunk driving from the source or depend on the driver's consciousness. At present, more and more people can equip an alcohol detector on a vehicle to perform self detection, the existing vehicle-mounted alcohol detector generally has a fuel cell type and a semiconductor type, the cost of the fuel cell type alcohol detector is higher, continuous operation cannot be performed, if a user just blows air from a small opening at the beginning, and when the air blowing amount is increased, the alcohol detector can temporarily stop working, so that the error of a measuring result is caused; the sensitivity of the semiconductor type alcohol detector can change along with the change of the external environment, and the working life is short.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an on-vehicle alcohol detection device can detect the alcohol content in driver's exhalation before the vehicle starts, prevents the emergence that wine drove.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a vehicle-mounted alcohol detection system is arranged on a steering wheel and comprises an infrared detection device, a signal processing device and a control device, wherein the infrared detection device comprises an air chamber, an infrared light source, a photoelectric detector, an expiration pipeline and an air outlet pipeline; infrared light source and photoelectric detector set up respectively in both ends about the air chamber, and photoelectric detector's detection face sets up towards infrared light source, exhales the pipeline and is close to infrared light source one side setting, and the pipeline of giving vent to anger is close to photoelectric detector one side setting, photoelectric detector links to each other with controlling means through signal processing device, and controlling means links to each other with infrared detection device, and controlling means still links to each other with the braking system of car.

Preferably, the signal processing device comprises a filtering and amplifying circuit and an a/D converter, the filtering and amplifying circuit comprises a first operational amplifier and a second operational amplifier, the positive phase input terminal of the first operational amplifier is grounded through a first capacitor, the positive phase input terminal of the first operational amplifier is further connected with the photodetector through a first resistor, the negative phase input terminal of the first operational amplifier is grounded through a second resistor, the negative phase input terminal of the first operational amplifier is further connected with the output terminal of the first operational amplifier through a third resistor, the output terminal of the first operational amplifier is connected with the positive phase input terminal of the second operational amplifier, the negative phase input terminal of the second operational amplifier is grounded through a fourth resistor, the negative phase input terminal of the second operational amplifier is further connected with the output terminal of the second operational amplifier through a fifth resistor, the output terminal of the second operational amplifier is sequentially grounded through a sixth resistor and a second capacitor, and the common end of the sixth resistor and the second capacitor is connected with the A/D converter.

Preferably, the control device comprises a microprocessor, a display, a voice prompter and a driving circuit, wherein the display, the voice prompter and the driving circuit are respectively connected with the microprocessor, and the microprocessor is connected with the A/D converter; the drive circuit comprises a triode and a voltage stabilizer, the base electrode of the triode is connected with the PWM output port of the microprocessor through a first resistor, the emitting electrode of the triode is grounded, the collecting electrode of the triode is sequentially connected with the input end of the voltage stabilizer through an eighth resistor and a first diode, the input end of the voltage stabilizer is connected with the positive electrode of a power supply, the input end of the voltage stabilizer is grounded through a third capacitor, the voltage control end of the voltage stabilizer is grounded through a ninth resistor, the output end of the voltage stabilizer is grounded through a fourth capacitor, and the output end of the voltage stabilizer is connected with the infrared light.

Preferably, an infrared filter is disposed on both the emission side of the infrared light source and the detection surface side of the photodetector.

Preferably, a fan is arranged in the air outlet pipeline.

Preferably, a heating device is further arranged in the air chamber, the heating device comprises a heating plate and a thermistor, and the heating plate and the thermistor are both connected with the microprocessor.

Preferably, the end part of the expiration pipeline is detachably provided with a blowing nozzle and a plug, and the end part of the air outlet pipeline is detachably provided with a plug.

The utility model detects the alcohol concentration in the exhaled air by using the principle that different organic substances absorb different wavelengths of infrared rays, and compared with fuel cell type and semiconductor type alcohol detectors, the sensitivity and the working durability are greatly improved; infrared detection device sets up in the steering wheel, does not influence driver's driving experience, just the utility model discloses link to each other with the braking system of car, only can start the vehicle when detecting the alcohol content in the gas of exhalation and be no longer than the setting value to prevent the emergence that wine drove effectively.

Drawings

Fig. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

FIG. 3 is a schematic block diagram of the present invention;

fig. 4 is a schematic circuit diagram of the filter amplifier circuit of the present invention;

fig. 5 is a schematic circuit diagram of the driving circuit of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1 to 5, the utility model discloses an on-vehicle alcohol detecting system sets up on the steering wheel, including consecutive infrared detection device, signal processing apparatus and controlling means, infrared detection device is arranged in detecting the alcohol content in driver's exhalation gas, and the signal that detects inputs controlling means after signal processing apparatus handles, and controlling means links to each other with the braking system of car, and only when detecting the alcohol content in driver's exhalation gas and being less than the setting value, the car just opens.

The infrared detection device comprises an air chamber 1, an infrared light source 2, a photoelectric detector 8, an expiration pipeline 4 and an air outlet pipeline 6, wherein the air chamber 1 is horizontally arranged in the steering wheel, the expiration pipeline 4 and the air outlet pipeline 6 are respectively communicated with the air chamber 1, the expiration pipeline 4 and the air outlet pipeline 6 are respectively arranged close to two ends of the air chamber 1, and the expiration pipeline 4 and the air outlet pipeline 6 both extend out of the steering wheel; infrared light source 2 and photodetector 8 set up both ends about in air chamber 1 respectively, and photodetector 8's detection face sets up towards infrared light source 2, all be provided with infrared filter 3 on infrared light source 2's transmitting side and photodetector 8's detection face side, the light of infrared light source 2 transmission is filtered the back through infrared filter 3, make the light of specific wavelength pass through air chamber 1, filter the back through infrared filter 3 again, make the infrared light reinforcing that photodetector 8 received, improve the degree of accuracy that detects, photodetector 8 links to each other with signal processing device.

The end part of the expiration pipeline 4 is detachably provided with a blowing nozzle and a plug, the end part of the air outlet pipeline 6 is detachably provided with a plug, when the air conditioner is used, the plug is opened, air is blown into the air chamber 1 through the blowing nozzle, infrared light emitted by the infrared light source 3 is absorbed by air in the air chamber 1, a difference value exists between the amount of the infrared light received by the photoelectric detector 8 and the amount of the infrared light emitted by the infrared light source 2, the difference value is related to the concentration of alcohol in the air chamber 1, the alcohol content in the exhaled air can be judged according to a signal detected by the photoelectric detector 8, the signal detected by the photoelectric detector 8 is input into the control device after being processed by the signal processing device, whether the amount exceeds the standard is judged by the control device, if the amount exceeds the standard, the control device controls the starting system of an automobile; after the detection is finished, the blowing nozzle can be pulled out, and then the expiration pipeline 4 and the air outlet pipeline 6 are respectively plugged by plugs to prevent ash falling.

A fan 7 is arranged in the air outlet pipeline 6 and is used for pumping out the humid air in the air chamber 1 to protect the equipment in the air chamber 1.

The signal processing device comprises a filter amplifying circuit and an A/D converter, the filter amplifying circuit comprises a first operational amplifier U1 and a second operational amplifier U2, the non-inverting input terminal of the first operational amplifier U1 is grounded through a first capacitor C1, the non-inverting input terminal of the first operational amplifier U1 is also connected with the photodetector 8 through a first resistor R1, the inverting input terminal of the first operational amplifier U1 is grounded through a second resistor R2, the inverting input terminal of the first operational amplifier U1 is also connected with the output terminal of the first operational amplifier U1 through a third resistor R3, the output terminal of the first operational amplifier U1 is connected with the non-inverting input terminal of the second operational amplifier U2, the inverting input terminal of the second operational amplifier U2 is grounded through a fourth resistor R4, the inverting input terminal of the second operational amplifier U2 is also connected with the output terminal of the second operational amplifier U2 through a fifth resistor R5, the output terminal of the second operational amplifier U2 is sequentially grounded through a sixth resistor R6 and a second capacitor C2, the common terminal of the sixth resistor R6 and the second capacitor C2 is connected to the A/D converter.

The light intensity detected by the photoelectric detector 8 is weak, and after noise reduction and amplification by the two-stage operational amplifier, the light intensity is input into the A/D converter and converted into a signal which can be identified by the control device.

The control device comprises a microprocessor, a display, a voice prompter and a driving circuit, wherein the display, the voice prompter and the driving circuit are respectively connected with the microprocessor, the microprocessor is connected with the A/D converter, the display is used for displaying the detected alcohol concentration, the voice prompter is used for reminding a driver, and the driving circuit is used for driving the infrared light source. The signal processed by the signal processing circuit is input into the microprocessor, the microprocessor judges whether the signal exceeds a set value or not, and the microprocessor is used for outputting a PWM signal and driving the infrared light source 2 to work.

The driving circuit comprises a triode VT1 and a voltage stabilizer U3, the base electrode of the triode VT1 is connected with the PWM output port of the microprocessor through a first resistor R1, the emitter electrode of the triode VT1 is grounded, the collector electrode of the triode VT1 is connected with the input end of the voltage stabilizer U3 through an eighth resistor R8 and a first diode D1 in sequence, the input end of the voltage stabilizer U3 is connected with a power supply anode VCC, the input end of the voltage stabilizer U3 is grounded through a third capacitor C3, the voltage control end of the voltage stabilizer U3 is grounded through a ninth resistor R9, the output end of the voltage stabilizer U3 is grounded through a fourth capacitor C4, and the output end of the voltage stabilizer U3 is connected with the infrared light source 2.

In addition, still be provided with heating device in the air chamber 1, heating device includes hot plate 9 and thermistor 5, and hot plate 9 and thermistor 5 all link to each other with microprocessor, and hot plate 9 is used for heating air chamber 1, improves infrared light source 2 and photodetector 8's temperature stability, and when the high temperature in air chamber 1, by thermistor 5 output signal to microprocessor, microprocessor control hot plate 9 stop work. The process is the prior art and is not the point of the invention of the present application, and therefore is not described in detail.

In this embodiment, the infrared light source 2 is an IRL715 infrared light source, the a/D converter is an ADS8325 type a/D converter, the microprocessor is an S3C2440A controller, the first operational amplifier U1 and the second operational amplifier U2 are both AD8552 operational amplifiers, and the regulator U3 is an LM371 three-terminal regulator.

The utility model discloses at the during operation, at first open microprocessor, infrared light source 2 sends the infrared light to air chamber 1 in, then the driver blows in gas through exhaling pipeline 4 in to air chamber 1, the infrared light that infrared light source 3 sent is by the gas absorption back in the air chamber 1, detected by photoelectric detector 8, signal that photoelectric detector 8 detected falls through signal processing device and falls the input microprocessor after the amplification process, judge whether this alcohol content exceeds standard by microprocessor, if not exceed standard, then the vehicle can normally start, if exceed standard, then the braking system lock of microprocessor control car dies, the car can not start, and voice prompt device carries out the pronunciation and reminds. The process of judging whether the alcohol content exceeds the standard by the microprocessor is controlled by a program in the microprocessor, and a person skilled in the art can set the threshold and the program, and the process is the prior art and is not described again.

The utility model detects the alcohol concentration in the exhaled air by using the principle that different organic substances absorb different wavelengths of infrared rays, and compared with fuel cell type and semiconductor type alcohol detectors, the sensitivity and the working durability are greatly improved; the infrared monitoring device is arranged in the steering wheel and connected with a braking system of the automobile, and the automobile can be started only when the alcohol content in the exhaled gas is detected to be not more than a set value, so that drunk driving is effectively prevented.

Claims

1. The utility model provides an on-vehicle alcohol detecting system, sets up on the steering wheel, its characterized in that: the infrared detection device comprises an air chamber, an infrared light source, a photoelectric detector, an expiration pipeline and an air outlet pipeline, wherein the air chamber is horizontally arranged in the steering wheel, the expiration pipeline and the air outlet pipeline are respectively communicated with the air chamber, the expiration pipeline and the air outlet pipeline are respectively arranged close to two ends of the air chamber, and both the expiration pipeline and the air outlet pipeline extend out of the steering wheel; infrared light source and photoelectric detector set up respectively in both ends about the air chamber, and photoelectric detector's detection face sets up towards infrared light source, exhales the pipeline and is close to infrared light source one side setting, and the pipeline of giving vent to anger is close to photoelectric detector one side setting, photoelectric detector links to each other with controlling means through signal processing device, and controlling means links to each other with infrared detection device, and controlling means still links to each other with the braking system of car.

2. The vehicle alcohol detection system of claim 1, wherein: the signal processing device comprises a filtering amplifying circuit and an A/D converter, the filtering amplifying circuit comprises a first operational amplifier and a second operational amplifier, the positive phase input end of the first operational amplifier is grounded through a first capacitor, the positive phase input end of the first operational amplifier is also connected with a photoelectric detector through a first resistor, the negative phase input end of the first operational amplifier is grounded through a second resistor, the negative phase input end of the first operational amplifier is also connected with the output end of the first operational amplifier through a third resistor, the output end of the first operational amplifier is connected with the positive phase input end of the second operational amplifier, the negative phase input end of the second operational amplifier is grounded through a fourth resistor, the negative phase input end of the second operational amplifier is also connected with the output end of the second operational amplifier through a fifth resistor, and the output end of the second operational amplifier is sequentially grounded through a sixth resistor and a second capacitor, and the common end of the sixth resistor and the second capacitor is connected with the A/D converter.

3. The vehicle-mounted alcohol detection system according to claim 1 or 2, wherein: the control device comprises a microprocessor, a display, a voice prompter and a driving circuit, wherein the display, the voice prompter and the driving circuit are respectively connected with the microprocessor, and the microprocessor is connected with the A/D converter; the drive circuit comprises a triode and a voltage stabilizer, the base electrode of the triode is connected with the PWM output port of the microprocessor through a first resistor, the emitting electrode of the triode is grounded, the collecting electrode of the triode is sequentially connected with the input end of the voltage stabilizer through an eighth resistor and a first diode, the input end of the voltage stabilizer is connected with the positive electrode of a power supply, the input end of the voltage stabilizer is grounded through a third capacitor, the voltage control end of the voltage stabilizer is grounded through a ninth resistor, the output end of the voltage stabilizer is grounded through a fourth capacitor, and the output end of the voltage stabilizer is connected with the infrared light.

4. The vehicle alcohol detection system of claim 3, wherein: and infrared filters are arranged on the emitting side of the infrared light source and the detecting surface side of the photoelectric detector.

5. The vehicle alcohol detection system of claim 4, wherein: and a fan is arranged in the air outlet pipeline.

6. The vehicle alcohol detection system of claim 5, wherein: and a heating device is also arranged in the air chamber, and comprises a heating plate and a thermistor which are both connected with the microprocessor.

7. The vehicle alcohol detection system of claim 6, wherein: the equal detachably of tip of exhaling the pipeline is provided with blow gun and end cap, and the tip detachably of pipeline of giving vent to anger is provided with the end cap.