CN115307936A - Vehicle detection system and method based on wireless communication - Google Patents
Vehicle detection system and method based on wireless communication Download PDFInfo
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- CN115307936A CN115307936A CN202211161539.6A CN202211161539A CN115307936A CN 115307936 A CN115307936 A CN 115307936A CN 202211161539 A CN202211161539 A CN 202211161539A CN 115307936 A CN115307936 A CN 115307936A
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000004891 communication Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title description 5
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims description 30
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 5
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- 230000008054 signal transmission Effects 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a vehicle detection system and a detection method based on wireless communication, which comprises a detection host, wherein a sensor module is arranged in the detection host, the sensor module is connected with an acquisition module, the acquisition module is connected with a wireless communication module, the detection host is connected with a vehicle-mounted host through the wireless communication module, and the sensor module comprises a signal sensor and an operational amplifier; the acquisition module comprises a power module, a signal processing module, an ADC chip and an MCU chip; the signal processing module comprises a voltage level conversion module, one end of the voltage level conversion module is connected with the operational amplifier, and the other end of the voltage level conversion module is connected with the fully differential amplifier; the full-differential amplifier is connected with the ADC chip, and the ADC chip is connected with the MCU chip. The invention can reduce the power consumption of the acquisition system and reduce unnecessary power loss.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a vehicle detection system based on wireless communication.
Background
The vehicle networking system is characterized in that vehicle-mounted terminal equipment is mounted on a vehicle instrument desk, so that all working conditions and static and dynamic information of a vehicle can be collected, stored and transmitted. The car networking system is divided into three parts: the system comprises vehicle-mounted equipment, a cloud computing processing platform and a data analysis platform. The vehicle monitoring is achieved through the cooperation among the vehicle-mounted equipment, the cloud computing processing platform and the data analysis platform. In the maintenance and detection process of the new energy automobile at present, the vibration detection of the motor is an important detection mode. The vibration information of the motor is generally collected and detected by a portable vibration signal detection device. But the signal that current portable vibration signal detection device gathered generally can not upload to the high in the clouds server of car machine and producer, and is all inconvenient to the self-checking adjustment and the study of car machine, also does not benefit to the real-time performance monitoring of producer's platform to the car. In addition, a large amount of chips have been integrateed on current portable vibration signal detection device's the signal acquisition circuit board, these chips generally adopt the single mode operation in the acquisition process, and the ADC uses fixed sampling frequency usually, this results in some comparatively idle time points in the acquisition process, the collection system is still in the work of full load, a very big part unnecessary consumption has been lost, under the limited condition of battery capacity, so not only can reduce the operating time of collection system, also can harm electronic components such as relevant chip, and then influence the life of equipment.
Disclosure of Invention
The invention aims to provide a vehicle detection system and a detection method based on wireless communication. The portable vibration signal detection device can upload the signals acquired by the portable vibration signal detection device to the vehicle machine and the cloud server for sharing and storing the acquired information. On the other hand, the portable vibration signal detection device can reduce the power consumption of the acquisition system and reduce unnecessary power loss.
The technical scheme of the invention is as follows: a vehicle detection system based on wireless communication comprises a detection host, wherein a sensor module is arranged in the detection host, the sensor module is connected with an acquisition module, the acquisition module is connected with a wireless communication module, the detection host is connected with a vehicle-mounted host and/or a cloud server through the wireless communication module, the sensor module comprises a signal sensor, and the signal sensor is connected with an operational amplifier; the acquisition module comprises a power module, a signal processing module, an ADC chip and an MCU chip; the power supply module is respectively connected with the signal sensor, the signal processing module, the ADC chip and the MCU chip; the signal processing module comprises a voltage level conversion module, one end of the voltage level conversion module is connected with the operational amplifier, and the other end of the voltage level conversion module is connected with the fully differential amplifier; the full-differential amplifier is connected with the ADC chip, and the ADC chip is connected with the MCU chip; the ADC chip has a low-power-consumption sampling mode; the low-power-consumption sampling mode of the ADC chip is started when the frequency of the input vibration signal is smaller than a threshold value, the MCU chip enables and disables the operational amplifier at the moment, and the power module supplies power to the ADC chip in a single power mode.
In the above vehicle detection system based on wireless communication, the power module has an IC1 power supply, an IC2 power supply, an IC3 power supply, an analog switch U2 and an analog switch U3, where the IC1 power supply outputs a voltage of 5V, and the IC2 power supply and the IC3 power supply output a voltage of 3.3V; the analog switch U2 and the analog switch U3 are both controlled by an IN end, when the MCU chip outputs a high level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are conducted, and when the MCU chip outputs a low level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are disconnected; when the ADC chip is in a low power consumption mode, the MCU chip controls the chip of the IC2 power supply to stop working, enables the operational amplifier, and conducts the S1 end and the D1 end of the U2 chip of the analog switch to form single power supply mode power supply.
In the vehicle detection system based on wireless communication, the sensor module and the acquisition module perform signal transmission through the IEPE interface.
In the vehicle detection system based on wireless communication, the power supply module includes a constant current source and a voltage stabilizing module, and the power supply module supplies power to the signal sensor through the constant current source; and the power supply module supplies power to the signal processing module, the ADC chip and the MCU chip through the voltage stabilizing module.
In the vehicle detection system based on wireless communication, the ADC chip and the MCU chip are connected through SPI communication.
In the foregoing vehicle detection system based on wireless communication, the fully differential amplifier is an ADA4940 fully differential amplifier; and the output end of the fully differential amplifier is provided with a filter capacitor for filtering out differential mode interference.
The detection method of the vehicle detection system based on the wireless communication comprises the steps that a sensor is arranged on a motor in a modular mode, when an ADC (analog to digital converter) chip is initially electrified, the fastest sampling rate is selected to collect vibration signals of the motor, the vibration signals are transmitted to an MCU (microprogrammed control unit) chip, the MCU chip obtains the maximum frequency of the vibration signals by carrying out Fourier transform on the vibration signals, the MCU chip configures a sampling mode of the ADC chip according to the maximum frequency of the vibration signals, when the frequency of the input vibration signals is greater than 64KHz, the ADC chip is configured into a fast sampling mode, when the frequency of the input vibration signals is greater than 16KHz and less than 64KHz, the ADC chip is configured into a medium sampling mode, when the frequency of the input vibration signals is less than 16KHz, the ADC chip is configured into a low power consumption mode, the MCU chip enables and disables an operational amplifier, and enables and disables the power supply module to supply power to the ADC chip in a single power supply mode; meanwhile, when the voltage amplitude of the vibration signal is lower than 3mV within 10s, the MCU chip judges that the current signal sensor acquisition state is an idle state, the ADC chip is configured to be in a low power consumption mode, and the data volume transmitted between the MCU chip and the upper computer is reduced so as to reduce the power consumption.
Compared with the prior art, the detection system is connected with the vehicle-mounted host and/or the cloud server through the wireless communication module, corresponding signals can be transmitted to the vehicle-mounted host and/or the cloud server through a wireless transmission mode, and detection maintenance personnel and manufacturers can conveniently obtain related sensing signals according to the vehicle-mounted host, so that the information of a vehicle can be conveniently known. The present invention employs an ADC chip model that has low power consumption and is capable of being enabled. When the system collects the vibration signal, the ADC chip firstly defaults to collecting at the maximum sampling rate for obtaining the maximum frequency of the vibration signal, and then the sampling mode of the ADC chip is configured according to the maximum frequency, so that the ADC chip can select different sampling rates according to different frequencies. When the ADC chip acquires a low-amplitude voltage signal for a long time, the MCU main control chip can judge that the time is idle time, so that the power module is controlled to supply power to the ADC chip in a single power mode and control the ADC chip to enter a low-power-consumption mode, the MCU chip can also actively reduce the communication speed between the MCU chip and the ADC chip and between the MCU chip and an upper computer, the data volume transmitted to the upper computer is reduced, and the whole vibration signal acquisition system can monitor the vibration signal in real time and reduce unnecessary power consumption loss. When a larger vibration signal amplitude appears, the whole vibration signal acquisition system can be instantly restored to an acquisition state from an idle state, and sampling can be carried out at a proper sampling rate, so that the power consumption of the whole system is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit schematic of a constant current source;
FIG. 3 is a schematic diagram of a supply circuit for a constant current source;
FIG. 4 is a schematic circuit diagram of a voltage regulation module;
FIG. 5 is a circuit schematic of a voltage level translation module;
FIG. 6 is a circuit schematic of a fully differential amplifier;
FIG. 7 is a circuit schematic of an ADC chip;
fig. 8 is a circuit schematic of the MCU chip.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
The embodiment is as follows: the vehicle detection system based on wireless communication comprises a detection host, wherein a sensor module 1 is arranged in the detection host, the sensor module 1 is connected with an acquisition module 2, the acquisition module 2 is connected with a wireless communication module 9, and the detection host is connected with an on-board host and/or a cloud server through the wireless communication module 9 and is used for transmitting a sensor signal to the on-board host and/or the cloud server. Each detection maintenance personnel and manufacturer can conveniently obtain related sensing signals according to the vehicle-mounted host, and further conveniently know the information of the vehicle. The sensor module and the acquisition module are used for signal transmission through an IEPE interface, and the IEPE interface is a two-wire interface, and comprises a signal, a power line and a ground wire. The sensor module 1 comprises a signal sensor 3, and the signal sensor 3 is connected with an operational amplifier 4; the signal sensor adopts an MEMS sensor, and the operational amplifier adjusts the voltage signal output by the signal sensor to meet the standard of an interface; the acquisition module 2 comprises a power module 5, a signal processing module 6, an ADC chip 7 and an MCU chip 8; the power supply module 5 is respectively connected with the signal sensor 3, the signal processing module 6, the ADC chip 7 and the MCU chip 8; the power supply module comprises a constant current source and a voltage stabilizing module, the constant current source is shown in figure 2, a power supply circuit of the constant current source is shown in figure 3, and the power supply module supplies power to the signal sensor through the constant current source; the power module supplies power to the signal processing module, the ADC chip and the MCU chip through the voltage stabilizing module, and the voltage stabilizing chip in the voltage stabilizing module is provided with an enabling terminal pin and can be controlled through an IO pin of the MCU chip, as shown in FIG. 4. The signal processing module 6 comprises a voltage level conversion module, a circuit of the voltage level conversion module is shown in fig. 5, one end of the voltage level conversion module is connected with an operational amplifier, the other end of the voltage level conversion module is connected with a fully differential amplifier, a circuit of the fully differential amplifier is shown in fig. 6, and an ADA4940 fully differential amplifier; the output end of the fully differential amplifier is provided with a filter capacitor (a capacitor C3 and a capacitor C4) for filtering differential mode interference, and the fully differential amplifier is used for converting a current end signal into a fully differential signal to match an ADC chip; the fully differential amplifier is connected with an ADC chip 7, the circuit of the ADC chip is shown in FIG. 7, the ADC chip 7 is connected with an MCU chip 8, and the MCU chip is shown in FIG. 8; the voltage level conversion module converts a 12V +/-2V voltage signal output by the operational amplifier into 2.5V +/-0.6V, and then converts a single-ended voltage signal into a differential signal through the fully differential amplifier and inputs the differential signal into the ADC chip, wherein the equivalent voltage range is 0V +/-1.6V; the ADC chip 8 has a low power consumption sampling mode; the chip is a sigma-delta type ADC chip, the MCU chip can write a register in the chip through SPI communication to configure different functions, the chip has three power consumption modes, namely a fast mode, a medium mode and a low power consumption mode, and the low power consumption mode supports single power supply. The master clock frequencies of the three modes are MCLK/2, MCLK/4 and MCLK/8 respectively, and the decimation rate can be configured to set the sampling speed of different frequencies; the low-power-consumption sampling mode of the ADC chip is started when the frequency of an input vibration signal is less than 16KHz, the MCU chip enables and disables the operational amplifier at the moment, and the power module supplies power to the ADC chip in a single power mode.
In this embodiment, as shown in fig. 4, the power module has an IC1 power supply, an IC2 power supply, an IC3 power supply, an analog switch U2 and an analog switch U3, where the IC1 power supply outputs 5V voltage, the IC2 power supply and the IC3 power supply output 3.3V voltage, and U4 is an operational amplifier; the EN end of the IC is an enabling pin, when the MCU chip inputs a high level to the EN pin, the IC chip starts to work, and when the MCU chip inputs a low level, the chip does not work; the same is true for the DISABLE end of U4; the analog switch U2 and the analog switch U3 are both controlled by an IN end, when the MCU chip outputs a high level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are connected, and when the MCU chip outputs a low level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are disconnected; the same is true for the DISABLE end of U4; when the ADC chip works in normal power consumption, three power supply ends are needed, a LowPower _ EN pin of the MCU chip is at a low level, a LowPower _ NEN pin is at a high level, S1 and D1 of the analog switch U3 chip are conducted, S2 and D2 of the analog switch U2 chip are conducted, namely AVDD1 is connected with 5V, AVDD2 is connected with 3.3V, and IOVDD is connected with 3.3V; when the ADC enters a low power consumption mode, the MCU chip pulls down the IOVDD _ EN, the IC2 power supply chip stops working, the LowPower _ NEN pin of the MCU chip is at a low level, the LowPower _ EN pin is at a high level, the operational amplifier of the U4 is enabled, and the S1 and the D1 of the analog switch U2 chip are switched on, so that the AVDD1, the AVDD2 and the IOVDD are all 3V, namely, single power supply is used for supplying power.
The signal acquisition of the acquisition system of this embodiment is that, when the ADC chip is initially powered on, the fastest sampling rate is selected to transmit the acquired vibration signal to the MCU chip, the MCU chip obtains the maximum frequency of the vibration signal by performing fourier transform on the vibration signal, the MCU chip configures the sampling mode of the ADC chip according to the maximum frequency of the vibration signal, when the frequency of the input vibration signal is greater than 64KHz, the ADC chip is configured in the fast sampling mode, when the frequency of the input vibration signal is greater than 16KHz and less than 64KHz, the ADC chip is configured in the medium sampling mode, when the frequency of the input vibration signal is less than 16KHz, the ADC chip is configured in the low power consumption mode, and the MCU chip enables and disables the operational amplifier, and the power module supplies power to the ADC chip in the single power mode; meanwhile, when the voltage amplitude of the vibration signal is lower than 3mV within 10s, the MCU chip judges that the current signal sensor acquisition state is an idle state, the ADC chip is configured to be in a low power consumption mode, and the data volume transmitted between the MCU chip and the upper computer is reduced so as to reduce the power consumption.
In summary, the acquisition system of the present invention employs an ADC chip model that has low power consumption and is capable of being enabled. When the system collects the vibration signal, the ADC chip firstly defaults to collecting at the maximum sampling rate for obtaining the maximum frequency of the vibration signal, and then the sampling mode of the ADC chip is configured according to the maximum frequency, so that the ADC chip can select different sampling rates according to different frequencies. When the ADC chip of the invention collects low-amplitude voltage signals for a long time, the MCU main control chip can judge that the time is idle time, thereby controlling the power module to supply power to the ADC chip in a single power mode and controlling the ADC chip to enter a low-power mode, and the MCU chip can also actively reduce the communication speed between the MCU chip and the ADC chip and an upper computer, reduce the data quantity transmitted to the upper computer, so that the whole vibration signal collection system can monitor vibration signals in real time and reduce unnecessary power loss. When a larger vibration signal amplitude appears, the whole vibration signal acquisition system can be instantly restored to an acquisition state from an idle state, and sampling can be carried out at a proper sampling rate, so that the power consumption of the whole system is reduced. Meanwhile, the invention can accurately detect the abnormal running state of the motor and has the advantages of simple structure and convenient detection.
Claims (7)
1. Vehicle detecting system based on radio communication, including detecting the host computer, be equipped with sensor module (1) in the detection host computer, sensor module (1) is connected with collection module (2), and collection module (2) are connected with wireless communication module (9), the detection host computer is connected with the on-vehicle host computer through wireless communication module (9), and on-vehicle host computer and high in the clouds server are connected, its characterized in that: the sensor module (1) comprises a signal sensor (3), and the signal sensor (3) is connected with an operational amplifier (4); the acquisition module (2) comprises a power module (5), a signal processing module (6), an ADC chip (7) and an MCU chip (8); the power module (5) is respectively connected with the signal sensor (3), the signal processing module (6), the ADC chip (7) and the MCU chip (8); the signal processing module (6) comprises a voltage level conversion module, one end of the voltage level conversion module is connected with the operational amplifier (4), and the other end of the voltage level conversion module is connected with a fully differential amplifier; the fully differential amplifier is connected with the ADC chip (7), and the ADC chip (7) is connected with the MCU chip (8); the ADC chip (8) has a low power consumption sampling mode; the low-power-consumption sampling mode of the ADC chip is started when the frequency of the input vibration signal is smaller than a threshold value, the MCU chip enables and disables the operational amplifier, and the power module supplies power to the ADC chip in a single power mode.
2. The wireless-communication-based vehicle detection system of claim 1, wherein: the power module is provided with an IC1 power supply, an IC2 power supply, an IC3 power supply, an analog switch U2 and an analog switch U3, wherein the IC1 power supply outputs 5V voltage, and the IC2 power supply and the IC3 power supply output 3.3V voltage; the analog switch U2 and the analog switch U3 are both controlled by an IN end, when the MCU chip outputs a high level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are conducted, and when the MCU chip outputs a low level to the IN end, the S1 end and the D1 end of the analog switch U2 or the analog switch U3 are disconnected; when the ADC chip is in a low power consumption mode, the MCU chip controls the chip of the IC2 power supply to stop working, enables the operational amplifier, and conducts the S1 end and the D1 end of the analog switch U2 chip to form single power supply mode power supply.
3. The wireless-communication-based vehicle detection system of claim 1, wherein: the sensor module and the acquisition module are used for signal transmission through an IEPE interface.
4. The wireless-communication-based vehicle detection system of claim 1, wherein: the power supply module comprises a constant current source and a voltage stabilizing module, and the power supply module supplies power to the signal sensor through the constant current source; and the power supply module supplies power to the signal processing module, the ADC chip and the MCU chip through the voltage stabilizing module.
5. The wireless-communication-based vehicle detection system of claim 1, wherein: and the ADC chip and the MCU chip are connected through SPI communication.
6. The wireless-communication-based vehicle detection system of claim 1, wherein: the fully differential amplifier is an ADA4940 fully differential amplifier; and the output end of the fully differential amplifier is provided with a filter capacitor for filtering out differential mode interference.
7. The detection method of a vehicle detection system based on wireless communication according to any one of claims 1 to 6, characterized in that: the sensor is arranged on the motor in a modular mode, when an ADC chip is initially electrified, the fastest sampling rate is selected to collect vibration signals of the motor, the vibration signals are transmitted to an MCU chip, the MCU chip obtains the maximum frequency of the vibration signals by carrying out Fourier transform on the vibration signals, the MCU chip configures the sampling mode of the ADC chip according to the maximum frequency of the vibration signals, when the frequency of the input vibration signals is greater than 64KHz, the ADC chip is configured to be in a fast sampling mode, when the frequency of the input vibration signals is greater than 16KHz and less than 64KHz, the ADC chip is configured to be in a medium sampling mode, when the frequency of the input vibration signals is less than 16KHz, the ADC chip is configured to be in a low power consumption mode, the MCU chip enables and disables an operational amplifier, and the power module supplies power to the ADC chip in a single power mode; meanwhile, when the voltage amplitude of the vibration signal is lower than 3mV within 10s, the MCU chip judges that the current signal sensor acquisition state is an idle state, the ADC chip is configured to be in a low power consumption mode, and the data volume transmitted between the MCU chip and the upper computer is reduced so as to reduce the power consumption.
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