CN203126535U - Automatic automobile-mounted alcohol detecting device - Google Patents

Abstract

The utility model discloses an automatic vehicle-mounted alcohol detection device, which comprises a control box, a gas sensor, a digital-to-analog conversion module, a control unit, a normally open relay and a buzzer. Wherein, the gas sensor is installed on the lower surface of the sun visor above the driver's head, and the other components are packaged in the control box, and the control box is placed under the center console of the car cab; wherein, the gas sensor The signal output terminal is connected to the input terminal of the digital-analog conversion module, the output terminal of the digital-analog conversion module is connected to the input terminal of the control unit, the normally open relay and the buzzer are respectively connected to the output port of the control unit; the control terminal of the normally open relay is connected to Car engine starting circuit. The device can stably and effectively measure the exhaled gas of each driver. If the driver's breath alcohol content exceeds the national limit value, it can prevent the car from starting, and technically prohibits the driver after drinking from driving.

Description

An automatic vehicle alcohol detection device

technical field

The utility model belongs to the field of process control and relates to an alcohol detection device, in particular to an intelligent vehicle-mounted alcohol detection device.

Background technique

In recent years, more and more traffic accidents caused by drunk driving have become the primary factor of traffic accidents. Although relevant state departments have promulgated a series of laws and regulations on drunk driving, due to the current detection Most of them are implemented by the traffic police, which leads to complex inspection procedures and strong randomness. It cannot be guaranteed that every driver can be tested, and eventually drivers who are lucky will still drive after drinking. Existing hand-held alcohol detectors can only detect drivers manually, which is a waste of manpower.

Therefore, for the shortcoming that the hand-held alcohol detector cannot carry out the alcohol test to each driver, it is very necessary to design an automatic vehicle alcohol detector.

Contents of the invention

In view of the defects or deficiencies in the above-mentioned prior art, the purpose of this utility model is to provide an automatic vehicle-mounted alcohol detection device, which can stably and effectively measure the breath exhaled by each driver. When the content exceeds the national limit value, it can prevent the car from starting, and the driver who has drunk is technically prohibited from driving.

For realizing above-mentioned technical task, the utility model takes following technical solution:

An automatic vehicle-mounted alcohol detection device includes a control box, a gas sensor, a digital-to-analog conversion module, a control unit, a normally-open relay and a buzzer. Wherein, the gas sensor is installed on the lower surface of the sun visor above the driver's head, and the other components are packaged in the control box, and the control box is placed under the center console of the car cab; wherein, the gas sensor The signal output terminal is connected to the input terminal of the digital-analog conversion module, the output terminal of the digital-analog conversion module is connected to the input terminal of the control unit, the normally open relay and the buzzer are respectively connected to the output port of the control unit; the control terminal of the normally open relay is connected to Automobile engine starting circuit.

Further, the control unit adopts STA89C51 single-chip microcomputer; the gas sensor adopts MQ-3 gas sensor; and the digital-to-analog conversion module adopts ADC0809.

Compared with the existing alcohol detection devices in the market, the utility model has the advantages of;

The MQ-3 type in the utility model has high detection sensitivity, and the output signal is at the volt level; the response speed is less than 10 seconds. Therefore, the utility model can stably and effectively measure the gas exhaled by the driver. If the alcohol content of the gas exceeds the national standard, the buzzer will be started and the car will be prevented from starting, thus ensuring the safety of the driver and road traffic.

Design principle of the present utility model is as follows:

The intelligent on-board alcohol detection device invented by the utility model, when the driver turns the start key to ON, the detection system is powered on, the control unit is initialized, the gas sensor is preheated, and after 20s the control unit sends a short sound alarm command to the buzzer to prompt The driver does a breath test. When the alcohol content of the driver's exhaled breath exceeds the national regulations, the control unit sends a continuous long sound command to the buzzer, but does not send a command to the relay to prevent the engine from starting. When the alcohol content of the driver's exhaled breath does not exceed the national regulations, the control unit does not send instructions to the buzzer, but sends instructions to the relay, the relay is closed, the starting circuit is connected, and the engine starts normally.

Description of drawings

Fig. 1 is a structural block diagram of the utility model.

The utility model is further explained below in conjunction with the accompanying drawings and specific embodiments.

Detailed ways

As shown in Figure 1, the automatic vehicle-mounted alcohol detection device of the present invention includes a control box, a gas sensor, a digital-to-analog conversion module, a control unit, a normally open relay and a buzzer. Wherein, the gas sensor is installed on the lower surface of the sun visor above the driver's head, and the other components are packaged in the control box, and the control box is placed under the center console of the car cab; wherein, the gas sensor The signal output terminal is connected to the input terminal of the digital-analog conversion module, the output terminal of the digital-analog conversion module is connected to the input terminal of the control unit, the normally open relay and the buzzer are respectively connected to the output port of the control unit; the control terminal of the normally open relay is connected to Automobile engine starting circuit.

In this embodiment, the product selection of the above-mentioned components is as follows: the control unit adopts the STA89C51 type single-chip microcomputer; the gas sensor adopts the MQ-3 type gas sensor, and its working voltage is 5V; the digital-to-analog conversion module adopts ADC0809; the normally open relay and the buzzer The operating voltage of the device is 5V.

The working process of the present utility model is as follows:

The utility model is applied to ordinary automobiles, and is mainly used to cut off the starting circuit and prevent the engine from starting when necessary.

When the start switch is in the ON position, the gas sensor, digital-to-analog converter and control unit are powered on, the gas sensor is preheated, and the digital-to-analog converter and control unit are initialized. After 20s, the control unit sends a short-sound alarm command to the buzzer, and the buzzer prompts the driver to perform a breath test. When the alcohol content of the driver's exhaled breath exceeds the national regulations, the control unit sends a continuous long sound command to the buzzer, but does not send a command to the normally open relay. Therefore, the engine starting circuit is broken and the engine cannot be started.

When the alcohol content of the driver's exhaled breath does not exceed the national regulations, the control unit sends instructions to the relay, but does not send instructions to the buzzer. After the relay is energized, the normally open switch is closed, the engine starting circuit is connected, and the engine starts normally.

Since the device of the present invention detects the alcohol content of the driver's exhaled gas in the cab, the sensitivity of the gas sensor should be improved in order to reach the national limit value.

Claims (2)

1. an automatic vehicle-mounted alcohol detection device, is characterized in that, comprises control box, gas sensor, digital-to-analog conversion module, control unit, normally open relay and buzzer; Wherein, described gas sensor is installed on driver's head top The lower surface of the sun visor, and the other components are packaged in the control box, and the control box is placed under the center console of the car cab; wherein, the signal output end of the gas sensor is connected to the input end of the digital-to-analog conversion module, and the digital The output end of the analog conversion module is connected to the input end of the control unit, the normally open relay and the buzzer are respectively connected to the output port of the control unit; the control end of the normally open relay is connected to the starting circuit of the automobile engine. the 2. The automatic vehicle-mounted alcohol detection device as claimed in claim 1, wherein said control unit adopts STA89C51 type single-chip microcomputer; said gas sensor adopts MQ-3 type gas sensor; said digital-to-analog conversion module adopts ADC0809. the

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