CN213579907U

CN213579907U - Portable baroceptor detector

Info

Publication number: CN213579907U
Application number: CN202022920380.4U
Authority: CN
Inventors: 周健; 陆小红; 郭宇斌; 俞斌; 苏杰
Original assignee: Wuxi United Trinity Electronics Co ltd
Current assignee: Wuxi United Trinity Electronics Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-06-29
Anticipated expiration: 2030-12-08

Abstract

The utility model discloses a portable baroceptor detector, which relates to the field of automobile electronic sensor detection and comprises a sensor plug, a wiring harness end socket, a connecting wiring harness and a data processing system; the sensor plug is connected with the air pressure sensor and receives a voltage signal output by the air pressure sensor, the harness end socket is connected with a whole vehicle harness, the whole vehicle harness is also connected with an automobile instrument, the first end of the connecting harness is respectively connected with the sensor plug and the harness end socket, the second end of the connecting harness is connected with the data processing system, the harness end socket receives a power supply voltage output by the whole vehicle harness, and also receives an analog pressure signal output by the data processing system and a voltage signal output by the air pressure sensor and outputs the analog pressure signal and the voltage signal to the automobile instrument; the data processing system compares the obtained signals with the display value of the automobile instrument to judge whether the air pressure sensor and/or the whole automobile wire harness breaks down, detection of the sensor in an assembly state is achieved, disassembly and replacement are not needed, and detection efficiency is improved.

Description

Portable baroceptor detector

Technical Field

The utility model belongs to the technical field of automotive electronics sensor detects and specifically relates to a portable baroceptor detector.

Background

The electronic information system is an indispensable control system of the automobile, the electronic sensor is an important component of the electronic information control system, the running condition of each system can be monitored and started in real time, timely and effective data signals are provided for deviation adjustment and fault processing, and powerful support is provided for reliable running of the automobile.

The air pressure sensor is an important component of a vehicle braking system, can convert pressure signals of the air storage tank into electric signals, transmits pressure information of the air storage tank to an automobile instrument through related lines, monitors the pressure information of the air storage tank in real time, and guarantees normal operation of the vehicle braking system.

In the performance judgment of the air pressure sensor, a portable direct-reading detection instrument does not exist, and the air pressure sensor is generally required to be detached to a special test bench for detection. For the maintenance site, when the pressure of the gas storage tank is insufficient, in order to check whether the gas pressure sensor fails, a new gas pressure sensor is only needed to be replaced, and then the gas storage tank is further overhauled according to whether the pressure failure is eliminated, so that the following problems are necessarily caused:

1. the air pressure fault maintenance is complicated, and the maintenance efficiency is seriously influenced;

2. because no special detection equipment is arranged on the site, the direct cause of the fault is difficult to find out in time, and fault misjudgment is easy to cause;

3. unreasonable replacement and installation of new parts can cause maintenance cost to rise;

4. the root cause can not be eliminated in time, and thus the complaint of customers is easy to be caused.

SUMMERY OF THE UTILITY MODEL

The invention provides a portable air pressure sensor detector aiming at the problems and the technical requirements. The data processing system compares the obtained signals with the display value of the automobile instrument to judge whether the air pressure sensor and/or the whole automobile wire harness breaks down, detection of the sensor in an assembly state is achieved, disassembly and replacement are not needed, and detection efficiency is improved.

The technical scheme of the utility model as follows:

a portable air pressure sensor detector comprises a sensor plug, a wire harness end socket, a connecting wire harness and a data processing system; the first end of the sensor plug is used as a first external connection port of the detector to be connected with the air pressure sensor and receive a voltage signal output by the air pressure sensor, the first end of the harness end socket is used as a second external connection port of the detector to be connected with a joint of a whole vehicle harness, the whole vehicle harness is also connected with the automobile instrument, the first end of the connection harness is respectively connected with the second end of the sensor plug and the second end of the harness end socket, the second end of the connection harness is connected with the data processing system, the harness end socket receives a power supply voltage output by the whole vehicle harness and is used for supplying power to the detector, and the harness end socket also receives an analog pressure signal output by the data processing system and a voltage signal output by the air pressure sensor and outputs.

The data processing system comprises a data processing circuit, a power supply processing circuit, a signal acquisition circuit, a D/A processing circuit, a liquid crystal display circuit and a key module, wherein the power supply processing circuit, the signal acquisition circuit, the D/A processing circuit, the liquid crystal display circuit and the key module are connected with the data processing circuit;

the signal acquisition circuit acquires a voltage signal output by the air pressure sensor, a power supply voltage output by the whole vehicle wire harness and a voltage signal output by the whole vehicle wire harness pressure signal acquisition end, the voltage signals are transmitted to the liquid crystal display circuit through the data processing circuit, and the voltage signals are displayed through the display screen.

The key module comprises a first key and a second key, the first key is used for switching a detection mode of the detector, the second key is used for switching detection parameters of the detector, the detection mode comprises a finished automobile wire harness detection mode and an air pressure sensor detection mode, and the detection parameters comprise power supply voltage and analog pressure signals; when the first button selects the whole vehicle wire harness detection mode, the second button is used for sequentially switching and checking whether the power supply voltage output by the whole vehicle wire harness and the whole vehicle wire harness pressure signal acquisition end are normal or not.

The data processing circuit comprises a single chip microcomputer and a switch gating unit, wherein the switch gating unit is respectively connected with a finished automobile wire harness signal acquisition circuit and a sensor signal acquisition circuit in the single chip microcomputer and the signal acquisition circuit;

the single chip microcomputer is realized based on an XC2224 chip, and the switch gating unit is realized based on a CD4050 chip.

The further technical scheme is that the D/A processing circuit comprises a DA converter and is realized based on an MCP4725 chip; when the detector is in an air pressure sensor detection mode, a voltage signal output by the air pressure sensor is output to the data processing circuit through the signal acquisition circuit and then output to the whole vehicle wire harness through the DA converter;

when the detector is in a finished automobile wire harness detection mode, an analog pressure signal output by the data processing system is output to a finished automobile wire harness through the DA converter.

The signal acquisition circuit comprises a sensor signal acquisition circuit, a power supply voltage acquisition circuit and a finished automobile wiring harness signal acquisition circuit;

the signal acquisition circuit includes a plurality of terminals, resistance, electric capacity and diode, and sensor signal acquisition circuit and whole car pencil signal acquisition circuit respectively have two sets of signal acquisition ends, and every signal acquisition end circuit connection looks same portion is: the anode of the diode is respectively connected with the first end of the first resistor and the first end of the first capacitor, the cathode of the diode is connected with the power supply, the common end of the diode and the first capacitor is used as the output end of the signal acquisition circuit and is connected with the singlechip of the data processing circuit, the second end of the first resistor is connected with the first end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are both grounded; in the sensor signal acquisition circuit, the common end of the first resistor and the second capacitor of each group of signal acquisition ends is used as the input end of the signal acquisition circuit and is connected with the air pressure sensor after passing through the corresponding terminal; in the whole vehicle wire harness signal acquisition circuit, the common end of the first resistor and the second capacitor of each group of signal acquisition ends is grounded through a third resistor, the common end of the first resistor and the second capacitor is also used as the input end of the signal acquisition circuit and is connected with a whole vehicle wire harness after passing through corresponding terminals, and in one group of signal acquisition ends, the common end of the first resistor and the second capacitor is also connected with a switch gating unit in a data processing circuit;

in the power supply voltage acquisition circuit, a first end of a fourth resistor is connected with a common end of a fifth resistor and a sixth resistor which are connected in series, the other end of the fifth resistor is connected with a whole vehicle wiring harness after passing through a corresponding terminal, the other end of the sixth resistor is grounded, a second end of the fourth resistor is grounded through a third capacitor, and the second end of the fourth resistor is also used as a power supply acquisition end of a signal acquisition circuit to be connected with a single chip microcomputer of a data processing circuit.

The power supply processing circuit comprises a power supply boost controller and a voltage stabilizer, wherein the power supply processing circuit receives the power supply voltage output by the whole vehicle wire harness collected by the signal collecting circuit, boosts and filters the power supply voltage through the power supply boost controller, outputs the power supply voltage to the voltage stabilizer for voltage stabilization, and distributes the power supply voltage to each circuit of the detector for power supply;

the power supply boost controller is realized based on a TPS61041 chip, and the voltage stabilizer is realized based on an SPX5205 chip.

The data processing system also comprises an alarm circuit connected with the data processing circuit, and when the data processing circuit judges that the liquid crystal display value is inconsistent with the automobile instrument display value, the alarm circuit prompts the air pressure sensor and/or the whole automobile wire harness to break down through sound;

the alarm circuit comprises a plurality of resistors, a loudspeaker and a triode, the base of the triode is connected with the singlechip of the data processing circuit through a seventh resistor, the collector of the triode is connected with the first input end of the loudspeaker, the second input end of the loudspeaker is connected with the power supply through an eighth resistor and a ninth resistor in sequence, and the emitting electrode of the triode is grounded.

The further technical scheme is that the main body of the detector has a volume of 120mm multiplied by 68mm multiplied by 25mm, the total weight is 0.2kg, and the detector has a small volume and is convenient to carry and use.

The utility model has the beneficial technical effects that:

the detector is small in size and convenient to carry and use, is respectively connected with the air pressure sensor and the whole vehicle wire harness, is convenient to detect whether the air pressure sensor and the whole vehicle wire harness have faults or not in a maintenance site in time, and can accurately judge the fault reason; during detection, the button module is firstly switched to a whole vehicle wiring harness detection mode, whether the power supply voltage and the analog pressure are normal or not is checked in sequence, if not, the whole vehicle wiring harness is in fault, if so, the button module is switched to an air pressure sensor detection mode, whether a voltage signal output by an air pressure sensor is consistent with a display value of an automobile instrument or not is judged, and if not, the air pressure sensor is in fault; each signal value that data processing system gathered all can demonstrate through the display screen after handling, possess visual function, still report an emergency and ask for help or increased vigilance through the suggestion of alarm unit when having the trouble, compare with traditional sensor detection, the baroceptor of this application detects and need not borrow test bench and other instruments again, realized the detection of baroceptor under the assembled condition, need not to tear open and trade and detect, showing the detection efficiency who has improved baroceptor, the misjudgement rate has been reduced, and the detector passes through the power supply of whole car pencil, need not to connect additional power again.

Drawings

Fig. 1 is a structural diagram of a portable air pressure sensor detector provided in the present application.

FIG. 2 is a functional block diagram of a data processing system provided herein.

Fig. 3 is a circuit diagram of a liquid crystal display circuit provided in the present application.

Fig. 4 is a circuit diagram of a key module provided in the present application.

Fig. 5 is a circuit diagram of a data processing circuit provided in the present application.

Fig. 6 is a circuit diagram of a signal acquisition circuit provided in the present application.

Fig. 7 is a circuit diagram of a D/a processing circuit provided in the present application.

Fig. 8 is a circuit diagram of a power supply processing circuit provided in the present application.

Fig. 9 is a circuit diagram of an alarm circuit provided in the present application.

Detailed Description

The following describes the embodiments of the present invention with reference to the accompanying drawings.

The application discloses portable baroceptor detector, its block diagram is shown in fig. 1, including sensor plug 1, pencil end socket 2, connection pencil 3 and data processing system 4. The first end of the sensor plug 1 is used as a first external connection port of the detector and is connected with the air pressure sensor, the air pressure sensor is connected with the air storage tank, and the sensor plug 1 receives a voltage signal output by the air pressure sensor. The first end of the wire harness end socket 2 serves as a second external connection port of the detector and is connected with a joint of a whole vehicle wire harness, the whole vehicle wire harness is further connected with an automobile instrument, the first end of the connection wire harness 3 is respectively connected with the second end of the sensor plug 1 and the second end of the wire harness end socket 2, the second end of the connection wire harness 3 is connected with the data processing system 4, the wire harness end socket 2 receives power supply voltage output by the whole vehicle wire harness and is used for supplying power to the detector, and the wire harness end socket 2 further receives analog pressure signals output by the data processing system 4 and voltage signals output by the air pressure sensor and outputs the analog pressure signals to the.

The data processing system 4 compares the obtained signals with the display value of the automobile instrument to judge whether the air pressure sensor and/or the whole automobile wire harness have faults or not.

Optionally, the main body of the detector has a volume of 120mm × 68mm × 25mm, the total weight is 0.2kg, and the detector has a small volume and is convenient to carry and use. The detector is respectively connected with the air pressure sensor and the whole vehicle wire harness, so that whether the air pressure sensor and the whole vehicle wire harness break down or not can be detected conveniently in time on a maintenance site, and the failure reason can be accurately judged.

Optionally, the structure of the sensor plug 1 and the harness end socket 2 can be adapted according to the structure requirement of the actual finished automobile harness and the sensor plug connector, the size and the structure of the connection harness 3 can be adapted according to the actual detection requirement, and the application does not limit the structure.

Fig. 2 shows a schematic block diagram of the data processing system 4, the data processing system 4 includes a data processing circuit, and a power processing circuit, a signal acquisition circuit, a D/a processing circuit, a liquid crystal display circuit and a key module 407 connected to the data processing circuit, and the second end of the connection harness 3 is connected to the signal acquisition circuit and the D/a processing circuit, respectively.

The signal acquisition circuit acquires a voltage signal output by the air pressure sensor, a power supply voltage output by a finished automobile wire harness and a voltage signal output by a finished automobile wire harness pressure signal acquisition end, the voltage signals are processed and analyzed by the data processing circuit and then transmitted to the liquid crystal display circuit, the display circuit is displayed through the display screen 406, the circuit diagram of the liquid crystal display circuit is shown in figure 3, and the display screen 406 is optional and is realized based on an LC082H1 chip.

Fig. 4 shows a circuit diagram of the key module 407, where the key module 407 includes a first key S1 and a second key S2, the first key S1 is used to switch a detection mode of the detector, the second key S2 is used to switch detection parameters of the detector, the detection modes include a whole vehicle harness detection mode and an air pressure sensor detection mode, and the detection parameters include a supply voltage and an analog pressure signal. When the first key S1 selects the whole vehicle harness detection mode, the second key S2 is used for sequentially switching and checking whether the power supply voltage output by the whole vehicle harness and the whole vehicle harness pressure signal acquisition end are normal or not.

Fig. 5 shows a circuit diagram of a data processing circuit, the data processing circuit includes a single chip microcomputer 401, a switch gating unit 402 and peripheral circuits thereof, the switch gating unit 402 is respectively connected to the single chip microcomputer 401 and a whole vehicle harness signal acquisition circuit and a sensor signal acquisition circuit in the signal acquisition circuit, when the detector is in a whole vehicle harness detection mode, the single chip microcomputer 401 controls the switch gating unit 402 to disconnect from the sensor signal acquisition circuit, and the switch gating unit 402 is used for shielding a voltage signal output by the air pressure sensor, so that the situation that a harness end socket 2 simultaneously outputs a voltage signal and an analog pressure signal output by the air pressure sensor, and interference is caused to whole vehicle harness detection is avoided.

Optionally, the single chip microcomputer 401 is implemented based on an SAK-XC2224L-20F66L chip, and the switch gating unit 402 is implemented based on a CD4050 chip.

It should be noted that the peripheral circuit of the single chip microcomputer is a conventional existing circuit, which is not described herein.

Fig. 6 shows a circuit diagram of a signal acquisition circuit, which includes a sensor signal acquisition circuit, a supply voltage acquisition circuit, and a vehicle harness signal acquisition circuit.

The signal acquisition circuit includes a plurality of terminals, resistance, electric capacity and diode D1, and sensor signal acquisition circuit and whole car pencil signal acquisition circuit respectively have two sets of signal acquisition ends, and every signal acquisition end circuit connection looks partyse is: the anode of the diode D1 is connected to the first end of the first resistor R1 and the first end of the first capacitor C1, the cathode of the diode D1 is connected to the power supply VDD, the common end of the diode D1 and the first capacitor C1 is used as the output end of the signal acquisition circuit and is connected to the single chip microcomputer 401 of the data processing circuit, specifically, two groups of signal acquisition ends of the sensor signal acquisition circuit are connected to the 14 pin S _ AD _ IN and the 16 pin AD _ IN _ S _ NTC of the single chip microcomputer 401 respectively; two groups of signal acquisition ends of the finished vehicle wiring harness signal acquisition circuit are respectively connected with 11 pins ECU _ IN _ Vout and 12 pins AD _ IN _ ECU _ NTC of the singlechip 401. The second end of the first resistor R1 is connected to the first end of the second capacitor C2, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded. In the sensor signal acquisition circuit, the common end of a first resistor R1 and a second capacitor C2 of each group of signal acquisition ends is used as the input end of the signal acquisition circuit and is connected with the air pressure sensor after passing through corresponding terminals and a connecting wire harness 3, in one group of signal acquisition ends, the common end of a first resistor R1 and a second capacitor C2 is connected with a power supply VDD through a second resistor R2, and the common end is also connected with switch gating units 4051-Y1 pins in the data processing circuit. In the whole vehicle wire harness signal acquisition circuit, the common end of a first resistor R1 and a second capacitor C2 of each group of signal acquisition ends is grounded through a third resistor R3, the common end of the first resistor R1 and the second capacitor C2 is also used as the input end of the signal acquisition circuit and is connected with a whole vehicle wire harness after being connected with a wire harness 3 through corresponding terminals, and in one group of signal acquisition ends, the common end of the first resistor R1 and the second capacitor C2 is also connected with switch gating units 4051-Y0 pins in a data processing circuit.

IN the Power supply voltage acquisition circuit, a first end of a fourth resistor R4 is connected with a common end of a fifth resistor R5 and a sixth resistor R6 which are connected IN series, the other end of the fifth resistor R5 is connected with a finished vehicle wiring harness after being connected with a wiring harness 3 through a corresponding terminal, the other end of the sixth resistor R6 is grounded, a second end of the fourth resistor R4 is grounded through a third capacitor C3, a second end of the fourth resistor R4 is also used as a Power supply acquisition end of a signal acquisition circuit to be connected with a single chip microcomputer 401 of a data processing circuit, and specifically, the 18-pin AD _ IN _ Power of the single chip microcomputer 401 is connected.

Fig. 7 shows a circuit diagram of a D/a processing circuit including a DA converter 403, which is implemented based on MCP4725 chips. When the detector is in the detection mode of the air pressure sensor, a voltage signal output by the air pressure sensor is output to the data processing circuit through the signal acquisition circuit (i.e. the sensor signal acquisition circuit) for processing and analysis, and then is output to the whole vehicle wiring harness through the connection wiring harness 3 after being processed by the DA converter 403.

When the detector is in a finished automobile wiring harness detection mode, the analog pressure signal output by the data processing system 4 is matched and processed by the DA converter 403 and then is output to the finished automobile wiring harness through the connecting wiring harness 3.

Fig. 8 shows a circuit diagram of a power processing circuit, which includes a power boost controller 404, a voltage stabilizer 405 and peripheral circuits thereof, where the power processing circuit receives a power supply voltage output by a whole vehicle harness acquired by a signal acquisition circuit (that is, a power supply voltage acquisition circuit), the power supply voltage is boosted (boosted to 10V) and filtered by the power boost controller 404, and then output to the voltage stabilizer 405 for voltage stabilization (voltage stabilization to 5V), and then distributed to each circuit of the detector for power supply (connection relation is not shown in fig. 2). It should be noted that the peripheral circuits of the power boost controller 404 and the voltage regulator 405 are conventional circuits, and are not described herein again.

Optionally, the power supply boost controller 404 is implemented based on a TPS61041 chip, and the voltage regulator 405 is implemented based on an SPX5205 chip.

Optionally, the data processing system 4 further includes an alarm circuit connected to the data processing circuit, a circuit diagram of which is shown in fig. 9, and when the data processing circuit determines that the liquid crystal display value is inconsistent with the automobile instrument display value, the alarm circuit prompts the air pressure sensor and/or the entire automobile harness to malfunction by sound.

The alarm circuit comprises a plurality of resistors, a loudspeaker B1 and a triode Q1, the base electrode of the triode Q1 is connected with the single chip microcomputer 401 of the data processing circuit through a seventh resistor R7, the collector electrode of the triode Q1 is connected with the first input end of the loudspeaker B1, the second input end of the loudspeaker B1 is connected with the power supply ECU _5V through an eighth resistor R8 and a ninth resistor R9 in sequence, and the emitting electrode of the triode Q1 is grounded.

The working principle of the portable air pressure sensor detector is as follows:

the whole vehicle wire harness joint connected with the air pressure sensor is pulled out, the air pressure sensor is connected with the sensor plug 1, the whole vehicle wire harness joint is connected with the wire harness end socket 2, the whole vehicle power supply is turned on, and the engine is flamed out.

Firstly, a first key S1 is pressed to select a finished automobile wire harness detection mode, then a second key S2 is pressed to sequentially switch and examine whether a power supply voltage output by a finished automobile wire harness and a simulated pressure signal output by a finished automobile wire harness pressure signal acquisition end are normal or not, meanwhile, a display screen 406 displays the power supply voltage or the simulated pressure, if the power supply voltage is abnormal, the subsequent steps are not carried out, the simulated pressure is generated by a data processing circuit and a D/A processing circuit and is used for detecting whether a signal matching end of the finished automobile wire harness is normal or not, at the moment, a switch gating unit 402 is disconnected with a sensor signal acquisition circuit, and if the simulated pressure is consistent with a display value of an automobile instrument, the finished automobile wire harness is normal.

If the voltage signal is consistent with the display value of the automobile instrument, the normal state of the air pressure sensor is preliminarily judged, otherwise, the fault exists in the air pressure sensor.

And finally, performing dynamic detection on the sensor, stepping on the brake, judging that the air pressure sensor is normal if the display screen 406 shows that the pressure of the sensor is reduced along with air bleeding during the braking of the automobile, and judging that the air pressure sensor has a fault if the voltage value of the sensor is unchanged.

Compared with the traditional sensor detection, the air pressure sensor detection does not need to borrow test bed and other instruments, the detection of the air pressure sensor in the assembly state is realized, the detection is not needed to be disassembled and replaced, the detection efficiency of the air pressure sensor is obviously improved, the misjudgment rate is reduced, and the detector is supplied with power through the whole vehicle wire harness and does not need to be connected with an additional power supply.

What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.

Claims

1. A portable air pressure sensor detector is characterized by comprising a sensor plug, a wire harness end socket, a connecting wire harness and a data processing system; the utility model discloses a pressure sensor, including sensor plug, sensor terminal socket, wire harness end socket, detector, wire harness end socket, sensor plug's first end conduct the first external connection port of detector is connected with baroceptor, receives and comes from the voltage signal of baroceptor output, the first end of wire harness end socket conduct the second external connection port of detector and the articulate of whole car pencil, motormeter is still connected to whole car pencil, the first end of connecting the pencil is connected respectively the second end of sensor plug and the second end of wire harness end socket, the second end of connecting the pencil is connected data processing system, wire harness end socket receives the supply voltage who comes from whole car pencil output and is used for giving the detector power supply, wire harness end socket still receives the analog pressure signal of data processing system output and the voltage signal of baroceptor output gives motormeter.

2. The portable baroceptor detector of claim 1, wherein the data processing system comprises a data processing circuit, and a power processing circuit, a signal acquisition circuit, a D/a processing circuit, a liquid crystal display circuit and a key module which are connected to the data processing circuit, wherein the second end of the connection harness is connected to the signal acquisition circuit and the D/a processing circuit respectively;

the signal acquisition circuit acquires the voltage signal output by the air pressure sensor, the power supply voltage output by the whole vehicle wire harness and the voltage signal output by the whole vehicle wire harness pressure signal acquisition end, and the voltage signal is transmitted to the liquid crystal display circuit through the data processing circuit and displayed through the display screen.

3. The portable baroceptor detector of claim 2, wherein the key module comprises a first key and a second key, the first key is used for switching a detection mode of the detector, the second key is used for switching detection parameters of the detector, the detection mode comprises a whole vehicle wiring harness detection mode and a baroceptor detection mode, and the detection parameters comprise the supply voltage and the analog pressure signal; when the first key selects the whole vehicle wire harness detection mode, the second key is used for sequentially switching and checking the power supply voltage output by the whole vehicle wire harness and whether the whole vehicle wire harness pressure signal acquisition end is normal or not.

4. The portable baroceptor detector of claim 3, wherein the data processing circuit comprises a single chip microcomputer and a switch gating unit, the switch gating unit is respectively connected with a whole vehicle harness signal acquisition circuit and a sensor signal acquisition circuit in the single chip microcomputer and the signal acquisition circuit, when the detector is in the whole vehicle harness detection mode, the single chip microcomputer controls the switch gating unit to be disconnected from the sensor signal acquisition circuit, and the switch gating unit is used for shielding a voltage signal output by the baroceptor;

the single chip microcomputer is realized based on an SAK-XC2224L-20F66L chip, and the switch gating unit is realized based on a CD4050 chip.

5. The portable barometer detector of claim 3, wherein the D/A processing circuitry comprises a DA converter, implemented on MCP4725 chips.

6. The portable baroceptor detector of claim 2, wherein the signal acquisition circuit comprises a sensor signal acquisition circuit, a supply voltage acquisition circuit and a vehicle harness signal acquisition circuit;

the signal acquisition circuit includes a plurality of terminals, resistance, electric capacity and diode, sensor signal acquisition circuit and whole car pencil signal acquisition circuit respectively have two sets of signal acquisition ends, every the same part is connected to signal acquisition end circuit: the anode of the diode is respectively connected with the first end of the first resistor and the first end of the first capacitor, the cathode of the diode is connected with the power supply, the common end of the diode and the first capacitor is used as the output end of the signal acquisition circuit and is connected with the singlechip of the data processing circuit, the second end of the first resistor is connected with the first end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are both grounded; in the sensor signal acquisition circuit, the common end of the first resistor and the second capacitor of each group of signal acquisition ends is used as the input end of the signal acquisition circuit and is connected with the air pressure sensor after passing through corresponding terminals, and in one group of signal acquisition ends, the common end of the first resistor and the second capacitor is connected with a power supply through the second resistor and is also connected with a switch gating unit in the data processing circuit; in the whole vehicle wire harness signal acquisition circuit, the common end of the first resistor and the second capacitor of each group of signal acquisition ends is grounded through a third resistor, the common end of the first resistor and the second capacitor is also used as the input end of the signal acquisition circuit and is connected with the whole vehicle wire harness after passing through corresponding terminals, and in one group of signal acquisition ends, the common end of the first resistor and the second capacitor is also connected with a switch gating unit in the data processing circuit;

in the power supply voltage acquisition circuit, the first end of a fourth resistor is connected with the common end of a fifth resistor and a sixth resistor which are connected in series, the other end of the fifth resistor is connected with the whole vehicle wiring harness after passing through a corresponding terminal, the other end of the sixth resistor is grounded, the second end of the fourth resistor is grounded through a third capacitor, and the second end of the fourth resistor is also used as the power supply acquisition end of the signal acquisition circuit to be connected with the single chip microcomputer of the data processing circuit.

7. The portable baroceptor detector of claim 2, wherein the power processing circuit comprises a power boost controller and a voltage stabilizer, the power processing circuit receives the power supply voltage output by the vehicle harness and acquired by the signal acquisition circuit, the power supply voltage is boosted and filtered by the power boost controller, and then the power supply voltage is output to the voltage stabilizer for voltage stabilization and then distributed to each circuit of the detector for power supply;

the power supply boost controller is realized on the basis of a TPS61041 chip, and the voltage stabilizer is realized on the basis of an SPX5205 chip.

8. The portable barometer detector of claim 2, wherein said data processing system further comprises an alarm circuit coupled to said data processing circuit, said alarm circuit audibly indicating a failure of said barometer and/or a vehicle wiring harness when said data processing circuit determines that a liquid crystal display value is not consistent with said vehicle instrument display value;

the alarm circuit comprises a plurality of resistors, a loudspeaker and a triode, the base of the triode is connected with the single chip microcomputer of the data processing circuit through a seventh resistor, the collector of the triode is connected with the first input end of the loudspeaker, the second input end of the loudspeaker is connected with the power supply through an eighth resistor and a ninth resistor in sequence, and the emitting electrode of the triode is grounded.

9. The portable barosensor meter of any one of claims 1 to 8, wherein the portable barosensor meter has a body volume of 120mm x 68mm x 25mm and a total weight of 0.2kg, and wherein the portable barosensor meter is small and easy to carry and use.