CN210693974U

CN210693974U - Bridge monitoring sensor system based on Can bus

Info

Publication number: CN210693974U
Application number: CN201922467042.7U
Authority: CN
Inventors: 田一鸣; 谢黎明; 吴平平; 杜赛赛; 徐寒亭; 赵翔
Original assignee: Anhui Transport Consulting and Design Institute Co Ltd; Highway Traffic Energy Saving and Environmental Protection Technology and Equipment Transportation Industry R&D Center
Current assignee: Anhui Transport Consulting and Design Institute Co Ltd; Highway Traffic Energy Saving and Environmental Protection Technology and Equipment Transportation Industry R&D Center
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-06-05
Anticipated expiration: 2029-12-31

Abstract

A bridge monitoring sensor system based on a Can bus comprises an MCU (microprogrammed control unit) microprocessor, wherein the MCU microprocessor is respectively connected with a front-end analog signal acquisition circuit, a digital signal isolation circuit and a real-time clock; the Can transceiver is respectively connected with the digital signal isolation circuit, the power isolation circuit and the Can interface and protection circuit; the power input interface and the protection circuit are respectively connected with the first power module and the second power module; the first power supply module supplies power to the MCU microprocessor; the second power module supplies power to the Can transceiver through the power isolation circuit. Under the complex field condition of a large-scale bridge monitoring system, the bridge monitoring sensor system based on the Can bus has a uniform industrial bus interface, a plurality of sensors Can be connected together in the Can bus mode, and the bridge monitoring sensor system has obvious advantages in the aspects of communication capacity, reliability, flexibility, low cost and the like.

Description

Bridge monitoring sensor system based on Can bus

The technical field is as follows:

the utility model belongs to the technical field of the electronic communication technique and specifically relates to a bridge monitoring sensor technique is related to.

Background art:

with the rapid development of economy since the reform is open, domestic traffic networks are continuously abundant and perfect, and bridge construction meets the golden age of construction. The bridge plays a vital role in road transportation and has an irreplaceable position in the process of high-speed rail erection. Along with the rapid development of bridge construction technology, a plurality of large-sized and oversize bridges are developed in China in recent years. The construction time of the bridges is short, most of the bridge structural strength is still in a reasonable range, structural fatigue does not occur, and the health of the bridge structure is highlighted along with the time migration.

At present, in data communication of a domestic large-scale bridge monitoring system, RS-485 industrial buses are mostly adopted as field buses, and the field buses are low in efficiency, poor in real-time performance, low in reliability, high in maintenance cost and the like. The bridge monitoring requirement is strong in anti-interference performance, multi-node and long-distance transmission are achieved, the data acquisition system based on the RS-485 bus cannot meet the requirement, and the Can bus has obvious advantages in the aspects of communication capacity, reliability, flexibility, low cost and the like compared with the RS-485 bus.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bridge monitoring sensor system based on Can bus in order to overcome the defect of above-mentioned current bridge monitoring data communication technique.

To achieve the above object, the present invention is realized by the following specific schemes:

a bridge monitoring sensor system based on a Can bus comprises an MCU (microprogrammed control Unit) microprocessor, a power input interface and protection circuit, a first power module, a second power module, a front-end analog signal acquisition circuit, a power isolation circuit, a digital signal isolation circuit, a real-time clock, a Can transceiver, a Can interface and protection circuit;

the MCU microprocessor is respectively connected with the front-end analog signal acquisition circuit, the digital signal isolation circuit and the real-time clock; the Can transceiver is respectively connected with the digital signal isolation circuit, the power isolation circuit and the Can interface and protection circuit; the power input interface and the protection circuit are respectively connected with the first power module and the second power module; the first power supply module supplies power to the MCU microprocessor; the second power module supplies power to the Can transceiver through the power isolation circuit.

The utility model discloses a further technique:

preferably, the MCU microprocessor selects a 32-bit microprocessor LPC11C14 based on a Cotex-M0 kernel, integrates a Can controller, integrates an API function for initialization and communication used by Can and Can Open standards through an internal ROM, and Can be directly called by a user. The device is provided with a 32KB on-chip Flash program memory, is provided with an 8-channel high-precision 10-bit ADC of +/-1 LSBDNL, and performs Flash ISP programming through a Can interface.

Preferably, the Can transceiver interface chip is TJA1040 and has high EMC performance, and Can bus signals CANTX and CANRX come out from C8051F040, are electrically isolated by digital isolation circuits, and then pass through the Can bus transceiver.

Preferably, the digital signal isolation circuit adopts a double-path high-speed magnetic isolator ADUM3201 for digital isolation, so that instantaneous interference on a bus is avoided.

Preferably, the power isolation circuit is ZY0505BS-1W for power isolation, so that the stability and the safety of the node are improved.

Preferably, the front-end analog signal acquisition circuit integrates a strain gauge, a displacement gauge and an acceleration sensor.

The beneficial effects of the utility model reside in that:

a bridge monitoring sensor system of Can bus for large-scale bridge detects has solved the current sensor standard and has not unified, because of various monitoring parameter points are comparatively discrete, the problem that inefficiency, real-time poor, reliability are low, the maintenance cost is high that the environment is complicated to lead to.

Description of the drawings:

in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts;

fig. 1 is a block diagram of the system structure of the present invention.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1, the utility model provides a bridge monitoring sensor system based on Can bus, including MCU microprocessor, power input interface and protection circuit, power module 1, power module 2, front end analog signal acquisition circuit, power isolation circuit, digital signal isolation circuit, real-time clock, Can transceiver, Can interface and protection circuit;

the MCU microprocessor is respectively connected with the front-end analog signal acquisition circuit, the digital signal isolation circuit and the real-time clock; the Can transceiver is respectively connected with the digital signal isolation circuit, the power isolation circuit and the Can interface and protection circuit; the power input interface and the protection circuit are respectively connected with the power module 1 and the power module 2; the power supply module 1 supplies power to the MCU microprocessor; the power module 2 supplies power to the Can transceiver through a power isolation circuit.

The MCU microprocessor selects a 32-bit microprocessor LPC11C14 based on a Cotex-M0 inner core, integrates a Can controller, integrates an API function for initialization and communication used by Can and Can Open standards through an internal ROM, and Can be directly called by a user. The device is provided with a 32KB on-chip Flash program memory, is provided with an 8-channel high-precision 10-bit ADC of +/-1 LSBDNL, and performs Flash ISP programming through a Can interface.

The Can transceiver interface chip is TJA1040 and has high EMC performance, and Can bus signals CANTX and CANRX come out from C8051F040, are respectively subjected to electrical isolation through a digital isolation circuit, and then pass through the Can bus transceiver.

The digital signal isolation circuit adopts a double-path high-speed magnetic isolator ADUM3201 for digital isolation, and instantaneous interference on a bus is avoided.

The power isolation circuit is used for power isolation for ZY0505BS-1W, and stability and safety of the node are improved.

The front-end analog signal acquisition circuit integrates a strain gauge, a displacement gauge and an acceleration sensor.

The system is initialized after being powered on. Based on the consideration of low power consumption, after initializing the Can, the master controller MCULPC11C14 puts all the IO, the on-chip peripherals of the MCU and the off-chip sensor devices into a low power consumption or power down mode state, and then sets itself into a sleep mode. The MCU is awakened at regular time through the RTC in the sensor, the host Can send a designated operation command to the sensor through the Can, the MCU performs corresponding operation after receiving the command word transmitted by the host, and data acquisition is performed through the front-end analog signal acquisition circuit. For example, the strain, the temperature and the humidity of the current bridge are collected, and data are returned to the remote host through the Can transceiver according to the requirement, so that the advanced industrialized and automatic data collection function is realized.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a bridge monitoring sensor system based on Can bus which characterized in that: the system comprises an MCU (microprogrammed control Unit) microprocessor, a power input interface and protection circuit, a first power module, a second power module, a front-end analog signal acquisition circuit, a power isolation circuit, a digital signal isolation circuit, a real-time clock, a Can transceiver, a Can interface and a protection circuit;

2. The Can bus-based bridge monitoring sensor system of claim 1, wherein: the digital signal isolation circuit adopts a double-path high-speed magnetic isolator ADUM3201 for digital isolation.

3. The Can bus-based bridge monitoring sensor system of claim 1, wherein: the power isolation circuit is used for power isolation for ZY0505 BS-1W.

4. The Can bus-based bridge monitoring sensor system of claim 1, wherein: the front-end analog signal acquisition circuit integrates a strain gauge, a displacement gauge and an acceleration sensor.