CN214823220U

CN214823220U - Trailer brake cylinder state on-line monitoring system

Info

Publication number: CN214823220U
Application number: CN202120549706.9U
Authority: CN
Inventors: 李磊; 菅迎宾; 董胜欢; 王庆芬; 霍俊仪; 刘洋
Original assignee: Shijiazhuang Institute of Railway Technology
Current assignee: Shijiazhuang Institute of Railway Technology
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-11-23
Anticipated expiration: 2031-03-17

Abstract

The utility model belongs to vehicle monitoring equipment, and relates to an on-line monitoring system for the brake cylinder state of a trailer, which comprises a pressure sensor and a first controller which are detachably arranged on the trailer; the pressure sensors comprise a first pressure sensor and a second pressure sensor which are arranged on control gas circuits of a driving cavity and a parking cavity of each brake cylinder; the first controller comprises a pressure signal input end connected with the pressure sensor, a wear signal input end connected with a wear sensor arranged on each brake shoe of the trailer and an alarm signal output interface. A second controller comprising a tractor cab mounted to the trailer; the second controller comprises an alarm signal input interface and a man-machine interaction device. The utility model discloses can carry out real-time detection to the gas circuit atmospheric pressure of brake wheel cylinder and the degree of wear of friction disc to send to the driver's cabin through wireless mode and show brake state and carry out audio alert, improve safe driving coefficient, guarantee driver personal safety.

Description

Trailer brake cylinder state on-line monitoring system

Technical Field

The utility model belongs to the vehicle check out test set field in the way, concretely relates to supplementary monitoring vehicle braking system safety state's equipment.

Background

The trailer is hung behind the tractor in the in-transit state, the braking mode of the heavy trailer is pneumatic braking, compressed air is provided by a trailer air pump, the compressed air is stored through an air storage cylinder, the compressed air is communicated to a brake cylinder along an air passage when braking is needed, a control valve on the brake cylinder is opened and closed by the air passage to control the extension of a push rod, the extension action of the push rod of the brake cylinder is transmitted to a brake shoe, and the friction plate of the brake shoe is in contact friction with a brake drum to achieve the purpose of braking. In the braking system of trailer, spare part is more, causes the braking inefficacy easily and causes the accident when having the part hidden danger, installs electronic monitoring system for vehicle braking system among the prior art to learn braking system's safe state through the signal of telecommunication of gathering immediately. The field of engineering vehicles generally considers that the failure caused by excessive wear of brake shoes is a main problem of failure of a brake system, the safety state of the brake system is difficult to master comprehensively only by collecting the wear degree of the brake shoes, further, for a trailer, the trailer and a tractor are not delivered simultaneously, and in use, the tractor of different vehicle manufacturers is frequently replaced, and the safety state of the brake system of the trailer is difficult to master comprehensively without considering the tractor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an installation state monitoring system suitable for a trailer by considering the defects of a detection system installed in the existing braking system,

the utility model discloses a technical scheme is a trailer brake wheel cylinder state on-line monitoring system, the utility model discloses an including following technical scheme in a plurality of embodiments: the device comprises a pressure sensor and a first controller which are detachably arranged on the trailer, and also comprises a second controller which is in communication connection with the first controller; the pressure sensors comprise first pressure sensors arranged on control gas paths of the brake cylinder driving cavities of the trailer and second pressure sensors arranged on control gas paths of the brake cylinder parking cavities of the trailer; the first controller comprises a pressure signal input end connected with the pressure sensor and a first communication interface for outputting a signal carrying pressure information; the second controller establishes a communication link with the first communication interface through a second communication interface of the second controller, and is provided with a human-computer interaction device.

In some preferable technical schemes, a driving cavity air inlet end and a parking cavity air inlet end of the wheel cylinder are both provided with a tee joint; the air inlet end of the first pressure sensor is connected with a tee joint arranged at the air inlet end of a driving cavity of the wheel cylinder, and the air inlet end of the second pressure sensor is connected with a tee joint arranged at the air inlet end of a parking cavity of the wheel cylinder; each brake cylinder is provided with one first pressure sensor and one second pressure sensor.

In one demonstration, the air inlet end of the first pressure sensor is connected with a tee joint arranged at the air inlet end of each wheel cylinder driving cavity, the air inlet end of the second pressure sensor is connected with a tee joint arranged at the air inlet end of each wheel cylinder parking cavity, the signal output end of the pressure sensor is connected with the pressure sensor wiring harness through a waterproof quick-connection connector, and the pressure sensor wiring harness is connected with the signal input end of the single chip microcomputer of the first controller through an analog-to-digital converter in the first controller. The alarm signal output interface of the first controller is a wireless sending module connected with the single chip microcomputer of the first controller, and the signal input end of the wireless sending module is connected with the signal output end of the single chip microcomputer of the first controller. A voltage conversion circuit is arranged in the first controller, the power supply input end of the voltage conversion circuit is connected with the output end of the trailer vehicle-mounted power supply, and the power supply output end of the voltage conversion circuit is connected with the power supply input end of the single chip microcomputer of the first controller. The alarm signal input interface of the second controller is a wireless receiving module connected with the singlechip of the second controller, and the wireless receiving module is wirelessly connected with the wireless sending module. The tee bend and the driving chamber intake pipe intercommunication of brake wheel cylinder driving chamber inlet end, and the tee bend and the parking chamber intake pipe intercommunication of parking chamber inlet end.

In another preferred technical solution, the second controller is detachably mounted to a cab of a tractor on which the trailer is mounted. One application scenario is that the second controller is used by the tractor driver, the second controller has a one-to-one correspondence with the first controller, and when the trailer switches tractors, the second controller should be detached from its tractor and left or transferred with the trailer, but not left or transferred with the tractor.

In other preferred technical solutions, the second controller is a mobile terminal connected to one or more first controllers at the same time. One application scenario of the method is that the second controller is used by a trailer management unit, the second controller and the first controller are in one-to-many correspondence, and the trailer management unit can conveniently master the current state and the on-the-way historical state of the trailers in jurisdiction in batches at a time.

In other preferred embodiments, the first controller includes a wear signal input connected to a wear sensor mounted on each brake shoe of the trailer. In an exemplary embodiment, a U-shaped metal wire is arranged at the end part of the wear sensor, the U-shaped metal wire is arranged at the innermost wear line position of the friction plate, the signal output end of the wear sensor is connected with a wear sensor wire harness through a waterproof quick-connection joint, and the wear sensor wire harness is connected with the signal input end of a single chip microcomputer of the first controller.

An improvement of one aspect of the above solution is that the first controller comprises a power supply input connected to the trailer power supply circuit; or the trailer is provided with an independent power supply, and the first controller comprises a power supply input end connected to the independent power supply. In one demonstration, a lithium battery is arranged in the first controller, the power supply input end of the lithium battery is connected with the power supply output end of the solar charging device serving as an independent power supply, and the power supply output end of the lithium battery is connected with the power supply input end of the single chip microcomputer of the second controller.

In another aspect, the improvement comprises the second controller including a bus interface for bus connection with the tractor engine ECU. The bus interface comprises a protocol conversion module, and one application scenario of the protocol conversion module is that when a trailer switches tractors, the second controller reads tractor running information or sends safety information to the tractor ECU through connection with the tractor engine ECUs, such as a CAN bus.

In another aspect, the improvement of the above technical solution is that the first controller is provided with a memory for storing unique identification information of the vehicle. One application scenario is that the first controller and the trailer have a one-to-one correspondence, and the unique vehicle identification information realizes the differential identification of the trailer rather than the differential identification of the tractor.

In another aspect, the human-computer interaction device comprises a touch interaction module, a visual interaction module and/or an auditory interaction module; the haptic interaction module includes a setup key to configure security parameters. In one demonstration, the man-machine interaction device comprises a set key, a display module and a voice prompt module, wherein the set key is connected with the signal input end of the single chip microcomputer of the second controller, and the display module and the voice prompt module are both connected with the signal output end of the single chip microcomputer of the second controller.

In another aspect, the improvement of the above technical solution is that the first controller or the second controller includes a neural network unit for determining pressure abnormality according to the collected pressure signal, and the neural network unit stores a neural network model with trained parameters, so as to output determination data of an abnormal safety state according to currently input driving cavity action pressure and parking cavity action pressure for a specific trailer model and maintenance time. In some simplified embodiments, a digital unit that can set a threshold parameter is used to determine an anomaly of the input signal.

It is easy to understand, the utility model provides a trailer wheel cylinder state on-line monitoring system, carry out real-time detection to the degree of wear of the gas circuit atmospheric pressure of wheel cylinder and friction disc, and send testing result to driver's cabin or other receiving terminals through wireless transmission's mode, in some embodiments mode through pilot lamp and audio alert shows braking system operating condition for the driver, solve the problem that the tractor driver can't in time learn wheel cylinder gas circuit atmospheric pressure and friction disc degree of wear in its driver's cabin with this, improve safe driving coefficient, guarantee driver personal safety.

The utility model provides a technical scheme's each different embodiment possesses following beneficial effect at least:

in some embodiments, a pressure sensor is arranged at the air inlet end of the wheel cylinder, an abrasion sensor is arranged on a friction plate of the brake shoe, the air pressure of the wheel cylinder and the abrasion degree of the friction plate are detected in real time, the signals are collected through a sensor wire harness and sent to a first controller, and the signals are sent out from an alarm signal output interface of the first controller, so that the state information of each wheel cylinder and each brake shoe friction plate is collected, and the problem that a driver cannot timely know the air pressure of the wheel cylinder air passage and the abrasion degree of the friction plate is solved.

In other embodiments, the second controller arranged on the receiving end device of the cab is communicated with the alarm signal output interface of the sending end device through the alarm signal input interface, and sends alarm information to the driver through the human-computer interaction device, so that the driver can finally obtain state information of each brake cylinder and each brake shoe friction plate in the cab, the driver can know the braking state of the vehicle conveniently, the safe driving coefficient is improved, and the personal safety of the driver is guaranteed.

In other embodiments, a tee joint is added at the air inlet end of the wheel cylinder and connected with a pressure sensor, so that pressure signals of a driving cavity and a parking cavity of the wheel cylinder can be conveniently acquired, the pressure sensor transmits the pressure signals to an analog-to-digital converter through a pressure sensor wire harness, the analog-to-digital converter converts the pressure analog signals into digital signals and then transmits the digital signals to a single chip microcomputer of a first controller, and finally detection and collection of the pressure signals are achieved.

In other embodiments, wear sensor's tip is equipped with U type wire, and U type wire sets up the most inboard wearing and tearing line position at the friction disc, and U type wire is worn and torn simultaneously when the most inboard wearing and tearing line position when the friction disc is worn and torn, and wear sensor will send a high level alarm signal, reports to the police when the most inboard position need be changed to the friction disc wearing and tearing, has effectively avoided the friction disc wearing and tearing to cause the brake failure's condition to take place totally. The wear sensor is connected with the wear sensor wire harness through the waterproof quick-plugging connector, the sensor probe can be replaced when the U-shaped metal wire is worn off by using the waterproof quick-plugging connector, and meanwhile, a certain waterproof effect can be achieved in daily driving.

In other embodiments, it is more convenient to adopt wireless sending module transmission signal to make the trailer install the sending terminal equipment additional, has avoided adopting wired connection mode to need demolish the automobile body, and has avoided the trouble from trailer chassis to driver's cabin wiring, has also significantly reduced the probability that the cable that adopts wired connection mode goes wrong.

In other embodiments, the sending end equipment is supplied with power by the vehicle-mounted power supply after voltage transformation of the voltage conversion circuit, all the sending end equipment is started and put into use synchronously when the trailer is started, the power supply by the vehicle-mounted power supply is more convenient, the sending end equipment can be started simultaneously as long as an engine of the trailer is started, the power cannot be cut off without stopping, and the continuity and the stability of detection of the pressure sensor and the abrasion sensor are enhanced.

In other embodiments, the wireless receiving module enables the second controller of the receiving end device to remotely and wirelessly receive the signal sent by the first controller, and the wireless connection enables the receiving end device to be placed at any position of the cab more flexibly, so that the driver can freely select the placing position.

In other embodiments, the second controller is connected with a setting key adopting a self-reset key for setting a pressure alarm threshold value and other functions of receiving end equipment, the application range of the online monitoring system is improved by increasing the setting key, and the corresponding pressure alarm threshold values are set for brake cylinders with different pressure specifications equipped by trailers of different manufacturers by setting the key. The display module and the voice prompt module can transmit the alarm information to the driver in a display and voice mode, so that the driver can acquire the vehicle braking state information more intuitively.

In other embodiments, the receiving end device is powered by the lithium battery, so that the portability of the receiving end device is improved, the limitation of a power line is avoided, and the flexibility of placing the receiving end device by a driver is further improved. The lithium battery can be charged by using the solar charging device, and solar energy can be fully utilized.

In other embodiments, a tee joint is added at the air inlet end of the wheel cylinder, so that an air passage connected with a pressure sensor is added at the air inlet end of the wheel cylinder on the basis of not influencing the original air inlet, and the air pressure at the air inlet end can be detected in real time and can be alarmed.

The technical solutions provided by the present invention are further clearly and completely described below with reference to the accompanying drawings through specific embodiments, so as to be implemented and improved by those skilled in the art, and other technical effects of the technical solutions of the present invention can also be embodied in these specific embodiments.

Drawings

Fig. 1 is a schematic view of a gas circuit connection of a wheel cylinder in an online monitoring system for the brake state of a trailer wheel cylinder in an embodiment of the present invention;

FIG. 2 is a sectional view of the wheel cylinder of the embodiment of FIG. 1;

FIG. 3 is a schematic illustration of a mechanical brake connection of the wheel cylinder of the embodiment of FIG. 1;

FIG. 4 is a schematic structural view of a brake shoe and a brake drum in the embodiment of FIG. 1;

FIG. 5 is an enlarged partial sectional view taken at A in FIG. 4;

fig. 6 is a block diagram of a transmitting terminal device in the on-line monitoring system for the brake cylinder status of the trailer according to an embodiment of the present invention;

fig. 7 is a structural block diagram of a receiving end device in the on-line monitoring system for the brake cylinder status of the trailer according to an embodiment of the present invention.

In the figure: 1. a push rod; 2. pushing the disc; 3. a travelling crane cavity; 4. a parking chamber; 5. a return spring; 6. a membrane; 7. an energy storage piston; 8. a parking spring; 9. a tee joint; 10. a travelling crane cavity air inlet pipe; 11. a parking cavity air inlet pipe; 121. a first pressure sensor; 122. a second pressure sensor; 13. a brake cylinder; 14. a pressure sensor wire harness; 15. a wear sensor wire harness; 16. a drive crank; 17. an eccentric cam; 18. a brake shoe; 19. a friction plate; 20. a wear sensor; 21. a U-shaped metal wire; 22. a brake drum; 23. an analog-to-digital converter; 241. 242, a single chip microcomputer; 25. a voltage conversion circuit; 26. a wireless transmission module; 27. a wireless receiving module; 28. setting a key; 29. a solar charging device; 30. a lithium battery; 31. a display module; 32. and a voice prompt module.

Detailed Description

What need be explained at first, the utility model discloses a conceive of, considering to the trailer, the link that goes out the problem easily should contain the gas circuit of brake wheel cylinder and detect, especially in the state of in the way the gas circuit will seriously influence the braking effect of trailer when leaking gas because sealed improper, can directly reduce the security of driving, and then endanger the safety of driver, vehicle and goods. In the prior art, an on-line monitoring system for detecting and alarming the air pressure of the air passage of the wheel cylinder in real time is not provided, so that a driver can hardly judge whether the air passage of the wheel cylinder leaks air when the trailer brakes, meanwhile, when the friction plate of the brake shoe is worn to the innermost wear line, the alarm lamp gives an alarm, but the wear sensor is connected with the alarm lamp of the cab in a wired mode through a wiring board of the tractor, the wired connection mode has hidden trouble that the line is broken and cannot be detected, once the line is broken, the driver is in extremely dangerous driving condition, moreover, the abrasion alarm signal of the friction plate and the air pressure abnormal signal of the brake cylinder can not be integrated and linked, and the prompt information must be output through the man-machine interface of the tractor, moreover, in the prior art, the voice prompt alarm is not provided, and the driver may ignore the fault state of the vehicle because the driver does not notice the alarm indicator lamp.

The technical solution 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The technical scheme on which the embodiments of the utility model are based is a trailer brake cylinder state on-line monitoring system, which comprises a pressure sensor and a first controller which are detachably arranged on a trailer, and a second controller which is in communication connection with the first controller; the pressure sensors comprise first pressure sensors arranged on control gas circuits of the driving cavities of the brake cylinders of the trailer and second pressure sensors arranged on control gas circuits of the parking cavities of the brake cylinders of the trailer; the first controller comprises a pressure signal input end connected with the pressure sensor and a first communication interface for outputting a signal carrying pressure information; the second controller establishes a communication link with the first communication interface through a second communication interface of the second controller, and is provided with a human-computer interaction device.

The system for monitoring the state of the wheel cylinder of the trailer in the first embodiment comprises a pressure sensor and a first controller which are arranged on the trailer, and a second controller which is arranged on a tractor. Referring to fig. 1-7, in this embodiment, each wheel pair of the trailer is provided with a wheel brake cylinder 13, a tee joint 9 is connected to an air inlet end of a driving cavity of the wheel brake cylinder 13, one air port of the tee joint 9 at the air inlet end of the driving cavity is communicated with a first pressure sensor 121 of the driving cavity through an air pipe, and the other air port is communicated with an original air inlet pipe 10 of the driving cavity and used for supplying air to the driving cavity; the air inlet end of the parking cavity of the wheel cylinder 13 is connected with a tee joint 9, one air port of the tee joint 9 at the air inlet end of the parking cavity is communicated with a second pressure sensor 122 of the parking cavity through an air pipe, and the other air port is communicated with an original air inlet pipe 13 of the parking cavity and used for supplying air to the parking cavity. The tee joint that increases on original gas circuit has increased the detection gas port of the second pressure sensor 122 in the first pressure sensor 121 and the parking chamber of driving a vehicle chamber on the basis that does not influence original admitting air, realizes detecting the atmospheric pressure in the driving chamber and the parking chamber of brake wheel cylinder 13 from this. The first controller includes a single chip microcomputer 241, an analog-to-digital converter 23, and a wireless transmission module 26 as a first communication interface. The pressure sensor 12 including each of the first pressure sensor 121 and the second pressure sensor 122 transmits the pressure signal acquired by each of the first pressure sensor 121 and the second pressure sensor to the analog-to-digital converter 23 with multiple inputs and outputs through the pressure sensor harness 14, the analog-to-digital converter 23 converts the pressure analog signal into a digital signal and transmits the digital signal to the single chip 24 of the first controller, and finally, the detection and collection of the pressure signal are realized.

As shown in fig. 4-5, a friction plate 19 is arranged on the brake shoe 18, a small hole is formed on the friction plate 19, a wear sensor 20 is arranged in the hole, a U-shaped metal wire 21 is arranged at the end part of the wear sensor 20, the U-shaped metal wire is arranged at the innermost wear line position of the friction plate 19, and the wear sensor 20 sends out a high-level alarm signal when the U-shaped metal wire 21 is worn away along with the abrasion of the friction plate 19. The wear sensor 20 is connected with the wear sensor wire harness 15 through a waterproof quick-plugging connector, the wear sensor 20 is more convenient to replace by using the waterproof quick-plugging connector, and meanwhile, a certain waterproof effect can be achieved in daily driving. The wear sensor 20 transmits a wear signal of the friction plate 19 of the brake shoe 18 to the single chip microcomputer 24 of the first controller through the wear sensor wire harness 15, and finally, the wear signal is detected and collected.

The alarm signal output interface of first controller is the wireless sending module 26 of being connected with the singlechip 24 of first controller, and the signal input part of wireless sending module 26 is connected with the singlechip 24's of first controller signal output part, and wireless sending module 26 sends the signal through wireless mode, has avoided arranging the problem that wired cable could send the signal to the driver's cabin from trailer chassis to driver's cabin. Be equipped with voltage conversion circuit 25 in the first controller, voltage conversion circuit 25's power input end is connected with trailer vehicle mounted power's output, voltage conversion circuit 25's power output end is connected with the power input end of the singlechip 24 of first controller, the sending end equipment is supplied power by vehicle mounted power after voltage conversion circuit 25 vary voltage, all sending end equipment all start-up when the trailer starts in step and put into use, strengthened continuity and stability that pressure sensor 12 and wear sensor 20 detected.

A second controller is arranged in a tractor cab of the trailer; the second controller comprises an alarm signal input interface and a man-machine interaction device, wherein the alarm signal input interface is in communication connection with the alarm signal output interface. The alarm signal input interface of the second controller is a wireless receiving module 27 connected with the single chip microcomputer of the second controller, the wireless receiving module 27 is in wireless connection with a wireless sending module 26, the wireless receiving module 27 can be in pairing connection with the wireless sending module 26, and receives signals sent by the wireless sending module 26 and sends the signals to the single chip microcomputer 24 of the second controller, so that receiving end equipment does not need to be connected by a wired signal cable, and the flexibility of the placement position of the receiving end equipment is improved.

The man-machine interaction device comprises a set key 28, a display module 31 and a voice prompt module 32, wherein the set key 28 is connected with the signal input end of the singlechip 24 of the second controller, and the display module 31 and the voice prompt module 32 are both connected with the signal output end of the singlechip 24 of the second controller. The setting key 28 is a self-reset key, and is used for setting a pressure alarm threshold value and other functions of receiving end equipment, and for brake cylinders with different pressure specifications equipped by trailers of different manufacturers, the corresponding pressure alarm threshold value is input by using the setting key 28. Display module 31 and voice prompt module 32 can transmit alarm information for the driver with the mode of different colour lights and voice broadcast, make the more audio-visual vehicle braking status information of acquireing of driver. A lithium battery 30 is arranged in the second controller, a power supply input end of the lithium battery 30 is connected with a power supply output end of the solar charging device 29, and a power supply output end of the lithium battery 30 is connected with a power supply input end of the singlechip 24 of the second controller. The receiving terminal equipment is powered by the lithium battery 30, so that the portability of the receiving terminal equipment is further improved, the receiving terminal equipment is not limited by a power line, and a driver can place the receiving terminal equipment at a position suitable for observation in a cab. Lithium battery 30 can utilize solar charging device 29 to charge, can make full use of solar energy, and lithium battery 30 also can be charged by vehicle mounted power or domestic power through power adapter simultaneously, has increased the convenience of receiving terminal equipment.

The signal output ends of the first pressure sensor 121 and the second pressure sensor 122 of each wheel cylinder 13 are connected with the signal input end of the analog-to-digital converter 23 supporting multi-channel input and output through the pressure sensor wire harness 14, so that the analog-to-digital converter 23 is connected with the first pressure sensor and the second pressure sensor of each wheel cylinder 13 and converts the air pressure value detected by the pressure sensor 12 from analog quantity to digital quantity, and the multi-channel input and output analog-to-digital converter 23 and the pressure sensor wire harness 14 avoid configuring an analog-to-digital converter 23 for each pressure sensor 12, thereby saving the assembly cost. The signal output end of the analog-to-digital converter 23 is connected with the signal input end of the singlechip 24 of the first controller, and the digital air pressure value is sent to the singlechip 24 of the first controller. The signal output end of the wear sensor 20 is connected with the signal input end of the single chip microcomputer 24 of the first controller through the wear sensor wire harness 15, the output end of the single chip microcomputer 24 of the first controller is connected with the signal input end of the wireless sending module 26, and the wireless sending module 26 sends out data sent by the single chip microcomputer 24 of the first controller in a wireless mode. The wireless receiving module 27 and the wireless transmitting module 26 are connected by wireless, and the wireless transmitting module 26 and the wireless receiving module 27 are connected by pairing. The signal output end of the wireless receiving module 27 is connected with the signal input end of the single chip microcomputer 24 of the second controller, the wireless receiving module 27 receives the signal sent by the wireless sending module 26 and then sends the data to the single chip microcomputer 24 of the second controller, the signal output end of the single chip microcomputer 24 of the second controller is respectively connected with the display module 31 and the voice prompt module 32, after the single chip microcomputer 24 of the second controller receives the data, the single chip microcomputer 24 judges through an internal program to send an instruction for lighting an indicator lamp with a corresponding color to the display module 31, and meanwhile, corresponding voice alarm information is played to the voice prompt module 32.

As shown in fig. 1-3, a push rod 1 extends from the interior of the wheel cylinder 13, a bolt hole is formed in the head of the push rod 1 and is connected with a transmission crank 16 through a bolt, an eccentric cam 17 is arranged at the end of a rotating shaft of the transmission crank 16, the eccentric cam 17 contacts and pushes a brake shoe 18 open when rotating, and the brake shoe 18 drives a friction plate 19 to contact with a brake drum 22 and generate friction, so that wheel braking is realized. During the braking process of the wheel, the air pressure in the driving chamber 3 and the parking chamber 4 of the wheel cylinder 13 changes correspondingly, the first pressure sensor and the second pressure sensor detect the change of the air pressure value, and the U-shaped metal wire 21 of the abrasion sensor 20 is worn out when the friction plate is abraded to the innermost abrasion line to detect the abrasion degree of the friction plate 19.

The system for on-line monitoring of the brake cylinder status of the trailer provided in the second embodiment is different from the first embodiment in that the system is applied to a large transportation vehicle such as a trailer, wherein the trailer comprises three axles, each axle comprises two wheels, and each wheel comprises a brake cylinder 13. The utility model discloses need to set up six brake wheel cylinders 13 altogether, one set of sending terminal equipment that contains the first controller and one set of receiving terminal equipment that contains the second controller.

As shown in fig. 1 to 7, when the engine of the trailer is started, the on-vehicle power supply changes the generated electricity into the voltage used by the transmitting-end device and supplies the electric power to the respective transmitting-end devices through the voltage conversion circuit 25 that allows wide voltage input. The sending end device comprises six first pressure sensors, six second pressure sensors, six wear sensors 20, an analog-to-digital converter 23, a vehicle-mounted power supply, a voltage conversion circuit 25, a single chip microcomputer 24 and a wireless sending module 26. The three-way valve 9 of the driving cavity air inlet end and the three-way valve 9 of the parking cavity air inlet end of the wheel cylinder 13 are provided with a first pressure sensor and a second pressure sensor which are used for monitoring the pressure of the driving cavity 3 and the parking cavity 4 of the wheel cylinder 13 and judging whether air leakage occurs or not, the first pressure sensor and the second pressure sensor are connected with a multi-channel input and output analog-to-digital converter 23 through a pressure sensor wire harness 14, an analog signal value of detected air pressure is converted into a digital signal through the analog-to-digital converter 23 and is sent to a single chip microcomputer 24 of a first controller, and the single chip microcomputer 24 of the first controller sends a pressure signal through a wireless sending module 26. A small hole is formed in a friction plate 19 on a brake shoe 18, an abrasion sensor 20 is installed in the small hole, a U-shaped metal wire 21 is arranged at the top of the abrasion sensor 20, the U-shaped metal wire 21 is installed at the innermost abrasion line position of the friction plate 19, when the friction plate 19 is abraded to the innermost position, the U-shaped metal wire 21 at the top of the abrasion sensor 20 is abraded off at the same time, the abrasion sensor 20 sends a high-level alarm signal from a signal output end, the abrasion alarm signal is sent to a single chip microcomputer 24 of a first controller, and the single chip microcomputer 24 of the first controller sends a wireless signal of the abrasion sensor 20 through a wireless sending module 26. Therefore, the functions of real-time monitoring, signal processing and wireless transmission of the air pressure of the brake cylinder 13 and the abrasion degree of the friction plate 19 are realized. Wear sensor 20 is connected with wear sensor pencil 15 through waterproof quick connector, can play certain waterproof effect, and after the U type wire 21 at wear sensor 20 top was worn out, can improve the efficiency of changing through quick convenient change wear sensor 20 of quick connector.

The receiving terminal device comprises a solar charging device 29, a lithium battery 30, a wireless receiving module 27, a second controller singlechip 24, a setting key 28, a display module 31 and a voice prompt module 32. The solar charging device 29 is used for absorbing solar energy and converting the solar energy into electric energy to charge the lithium battery 30, and the lithium battery 30 supplies power to each receiving terminal device, so that the receiving terminal devices are not connected by a power cable. The lithium battery 30 may also be charged by an onboard power supply or a household power supply through a power adapter. The wireless receiving module 27 receives the wireless data sent by the wireless sending module 26 and sends the wireless data to the single chip microcomputer 24 of the second controller, and the single chip microcomputer 24 of the second controller processes the data and then lights the indicator lamp with the corresponding color through the display module 31 and sends the corresponding voice prompt information through the voice prompt module 32. The setting key 28 adopting the self-reset key is arranged on the singlechip 24 of the second controller, so that the pressure alarm safety threshold value can be input and other functions of receiving end equipment can be set aiming at trailers of different manufacturers and brake cylinders 13 of different pressure specifications, and the application range of the on-line monitoring system is expanded. The driver places the receiving end equipment at a position easy to observe, the receiving end equipment sends out welcome voice after being started, and the wireless sending module 26 and the wireless receiving module 27 are successfully connected in a matched mode after the trailer is started and powered on, and the connection state is broadcasted through voice. The driver judges the air pressure state of the wheel cylinder 13 and the abrasion state of the friction plate 19 through the different color indicator lights which are lighted on the display module 31 in normal driving, when the air pressure of the wheel cylinder 13 changes or the friction plate 19 is abraded due to normal driving, braking and the like in driving, the indicator lights on the display module 31 change along with the change, specifically, the red light indicates the brake state, the green light indicates the driving state, and the yellow light indicates the abrasion alarm of the friction plate 19.

The brake wheel cylinder 13 is a double-cavity brake wheel cylinder, a tee joint is added on the original basis at the air inlet end of a driving cavity and the air inlet end of a parking cavity of the brake wheel cylinder 13, one air port of the tee joint 9 at the air inlet end of the driving cavity is communicated with an air storage cylinder through a driving cavity air inlet pipe 10, and the other air port is connected to a first pressure sensor of the driving cavity 3 through an air pipe to detect the air pressure of the driving cavity 3; one of the gas ports of the tee joint 9 at the air inlet end of the parking cavity is communicated with the air storage cylinder through the air inlet pipe 11 of the parking cavity, and the other gas port is connected into the second pressure sensor of the parking cavity 4 through the air pipe to detect the air pressure of the parking cavity 4. The trailer engine drives the air pump to generate compressed air, the compressed air is stored in the air storage cylinder, and the air storage cylinder is connected with six brake cylinders 13 of the trailer through control valves. Six first pressure sensors and six second pressure sensors at six shaft ends are simultaneously connected with a single chip microcomputer 24 of a first controller through analog-to-digital converters 23, and wear sensors 20 at six shaft ends are simultaneously connected with the single chip microcomputer 24 of the first controller.

When the trailer is in a driving state, the parking cavity air inlet pipe 11 connected with the tee joint 9 at the air inlet end of the parking cavity supplies air for a long time, and a second pressure sensor of the parking cavity 4 detects a certain air pressure value; the air in the travelling crane cavity air inlet pipe 10 connected with the tee joint 9 at the air inlet end of the travelling crane cavity is cut off, and the air pressure detected by the first pressure sensor in the travelling crane cavity 3 is zero. The parking cavity 4 is filled with compressed air, the energy storage piston 7 is pushed by air pressure to move backwards, meanwhile, the parking spring 8 is compressed, and the energy storage piston 7 does not eject out the diaphragm 6; compressed air in the service chamber 3 is exhausted, the push rod 1 is retracted into the brake cylinder 13 under the pushing of the push disc 2 by the return spring 5, the eccentric cam 17 connected with the push rod 1 does not rotate, the brake shoe 18 is not spread, and the friction plate 19 of the brake shoe 18 is separated from the brake drum 22 without contact and friction. The first pressure sensor and the second pressure sensor transmit air pressure detection data to the single chip microcomputer 24 of the first controller through the analog-to-digital converter 23, and the single chip microcomputer 24 of the first controller sends out wireless data through the wireless sending module 26. The wireless receiving module 27 receives the wireless data and transmits the wireless data to the single chip microcomputer 24 of the second controller, and the single chip microcomputer 24 of the second controller sends a green light lighting instruction to the display module 31 after being judged by an internal program, so that a green light is turned on, and a red light is turned off.

When a driver steps on a brake pedal in a driving state, the parking cavity air inlet pipe 11 connected with the tee joint 9 at the air inlet end of the parking cavity supplies air for a long time, and a second pressure sensor of the parking cavity 4 detects a certain air pressure value; a travelling crane cavity air inlet pipe 10 connected with a travelling crane cavity air inlet end tee joint 13 is changed from air cut-off to ventilation, compressed air is filled in a travelling crane cavity 3, and a first pressure sensor of the travelling crane cavity 3 detects a certain air pressure value. The parking cavity 4 is filled with compressed air, the energy storage piston 7 keeps a compressed state, the parking spring 8 keeps a compressed state, and the energy storage piston 7 does not eject out the diaphragm 6; the driving cavity 3 is filled with compressed air, the diaphragm 6 is pushed out by the compressed air, the push disc 2 is pushed by the diaphragm 6, the push disc 2 drives the push rod 1 to be pushed forwards, the push rod 1 enables the eccentric cam 17 to rotate for an angle through the transmission crank 16, the eccentric cam 17 pushes the brake shoe 18 open when rotating, and the brake shoe 18 drives the friction plate 19 to be in contact with the brake drum 22 to generate friction force, so that the purpose of braking in the driving process is achieved. The first pressure sensor and the second pressure sensor transmit data to the single chip microcomputer 24 of the first controller through the analog-to-digital converter 23, and the single chip microcomputer 24 of the first controller sends out wireless data through the wireless sending module 26. The wireless receiving module 27 receives the wireless data and transmits the wireless data to the single chip microcomputer 24 of the second controller, and the single chip microcomputer 24 of the second controller sends a red light lighting instruction to the display module 31 after being judged by an internal program, the red light is on, the green light is off, and meanwhile, the voice prompt module 32 sends a driving brake voice prompt.

When a driver releases a brake pedal in a driving state, the parking cavity air inlet pipe 11 connected with the tee joint 9 at the air inlet end of the parking cavity supplies air for a long time, and a second pressure sensor of the parking cavity 4 detects a certain air pressure value; a travelling crane cavity air inlet pipe 10 connected with a travelling crane cavity air inlet end tee joint 13 is changed from ventilation to air interruption, compressed air in the travelling crane cavity 3 is rapidly discharged, and air pressure detected by a first pressure sensor of the travelling crane cavity 3 is zero. The parking cavity 4 is filled with compressed air, the energy storage piston 7 is pushed by air pressure to keep a compressed state, the parking spring 8 keeps the compressed state, and the energy storage piston 7 does not eject out the diaphragm 6; compressed air in the service cavity 3 is exhausted, the push disc 2 is reset under the pushing of the return spring 5, the push rod 1 is retracted into the brake cylinder 13, the eccentric cam 17 connected with the push rod 1 is driven by the transmission crank 16 to rotate and reset, the brake shoe 18 is not propped open, the friction plate 19 of the brake shoe 18 is separated from the brake drum 22 and is not contacted and rubbed, and service braking is finished. The first pressure sensor and the second pressure sensor transmit data to the single chip microcomputer 24 of the first controller through the analog-to-digital converter 23, and the single chip microcomputer 24 of the first controller sends out wireless data through the wireless sending module 26. The wireless receiving module 27 receives the wireless data and transmits the wireless data to the single chip microcomputer 24 of the second controller, and the single chip microcomputer 24 of the second controller sends a green light lighting instruction to the display module 31 after being judged by an internal program, the green light is on, the red light is off, and meanwhile, a voice prompt of 'brake release' is sent out through the voice prompt module 32.

When the trailer is started and the air pressure signal detected by the pressure sensor 12 at a specific shaft end is inconsistent with the signals at other shaft ends, the singlechip 24 of the second controller receives the inconsistent pressure signal and judges the inconsistent pressure signal through an internal program, and then the voice prompt module 32 continuously sends out the voice prompt of inconsistent air pressure signal. And when the air pressure signals detected by the six first pressure sensors and the six second pressure sensors are consistent again after the inspection and the overhaul, stopping the voice prompt. When the friction plate 19 of any one brake shoe 18 at the six shaft ends is worn to the innermost wear line position, the U-shaped metal wire 21 at the top of the sensor probe of the wear sensor 20 is worn off and simultaneously sends out a high-level alarm signal, the singlechip 24 of the second controller receives the wear alarm signal and judges through an internal program, and then sends out a yellow light lightening instruction to the display module 31, the yellow light is lightened, and meanwhile, the voice prompt of friction plate wear is sent out through the voice prompt module 32. When the single chip microcomputer 24 of the second controller receives the high level alarm signal sent by the wear sensor 20, and the display module 31 is lighted by yellow light, if the driver is still in the driving state, that is, the first pressure sensor of the driving cavity 3 detects that the air pressure is zero, and the second pressure sensor of the parking cavity 4 detects a certain air pressure value and the green light is lighted, the single chip microcomputer 24 of the second controller continuously sends out a voice prompt of "before replacing the friction plate, do not need to continue driving" through the voice prompt module 32, and reminds the driver to replace the friction plate 19 in time. When the wireless receiving module 27 and the wireless sending module 26 are disconnected, the single chip microcomputer 24 of the second controller continuously sends out a voice prompt of 'wireless connection disconnection' through the voice prompt module 32, and reminds a driver to reset and reconnect the online monitoring system. When the lighting state of the indicator lamp is inconsistent with the actual driving brake state, a driver manually judges that the on-line monitoring system has a fault and timely checks and maintains the on-line monitoring system equipment.

The on-line monitoring system for the state of the wheel cylinder of the trailer provided in the third embodiment is different from the first and second embodiments in that when the engine of the trailer stops working, the vehicle-mounted power supply correspondingly stops working, and at this time, the storage battery of the trailer serves as an independent power supply to supply power for the sending-end equipment.

The on-line monitoring system for the status of the wheel cylinder of the trailer provided in the fourth embodiment is different from the above embodiments in that the single chip microcomputer 24 and the wireless transmission module 26 of the first controller in the transmitting-end device can be replaced by an integrated wireless transmission device, and the receiving-end single chip microcomputer 36 and the wireless reception module 27 in the receiving-end device can be replaced by an integrated wireless receiver.

The trailer wheel cylinder state online monitoring system provided in the fifth embodiment is different from the above embodiments in that the first pressure sensor 121 of the driving chamber 3, the second pressure sensor 122 of the parking chamber 4, and the analog-to-digital converter 23 may be replaced by digital pressure sensors, the output signals of the digital pressure sensors are digital signals, and analog-to-digital conversion is not required, and the signal output ends thereof are directly connected with the signal input ends of the single chip microcomputer 24 of the first controller.

The system for monitoring the state of the wheel cylinder of the trailer in the sixth embodiment is different from the above embodiments in that the pneumatic brake system can be replaced by a hydraulic brake system, and the pressure sensor 12 in the sending-end device can be changed to detect the pressure of the hydraulic oil in the hydraulic brake system.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications of the invention can be made, or equivalent changes and modifications can be made to some of the technical features of the embodiments.

Claims

1. The utility model provides a trailer brake wheel cylinder state on-line monitoring system which characterized in that: the device comprises a pressure sensor and a first controller which are detachably arranged on the trailer, and also comprises a second controller which is in communication connection with the first controller; the pressure sensors comprise first pressure sensors (121) arranged on control gas paths of driving cavities of all brake cylinders (13) of the trailer and second pressure sensors (122) arranged on control gas paths of parking cavities of all the brake cylinders (13); the first controller comprises a pressure signal input end connected with the pressure sensor (12) and a first communication interface for outputting a signal carrying pressure information; the second controller establishes a communication link with the first communication interface through a second communication interface of the second controller, and is provided with a human-computer interaction device.

2. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the air inlet end of the driving cavity and the air inlet end of the parking cavity of the brake cylinder (13) are both provided with a tee joint (9); the air inlet end of the first pressure sensor is connected with a tee joint (9) arranged at the air inlet end of a driving cavity of the wheel cylinder (13), and the air inlet end of the second pressure sensor is connected with the tee joint (9) arranged at the air inlet end of a parking cavity of the wheel cylinder (13); each wheel cylinder (13) is provided with one first pressure sensor and one second pressure sensor.

3. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the second controller is detachably mounted in a cab of a tractor for hanging the trailer.

4. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the second controller is a mobile terminal connected with one or a plurality of the first controllers at the same time.

5. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the first control unit comprises a wear signal input connected to a wear sensor (20) mounted on each brake shoe (18) of the trailer.

6. The on-line monitoring system for the brake cylinder state of the trailer as claimed in any one of claims 1 to 5, wherein: the trailer comprises a trailer power supply loop, and the first controller comprises a power supply input end connected to the trailer power supply loop; or the trailer is provided with an independent power supply, and the first controller comprises a power supply input end connected to the independent power supply.

7. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 3, characterized in that: the second controller comprises a bus interface for bus connection with the tractor engine ECU.

8. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the first controller is provided with a memory for storing unique identification information of the vehicle.

9. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the man-machine interaction device comprises a touch interaction module, a visual interaction module and/or an auditory interaction module; the haptic interaction module includes a set key (28) to configure a security parameter.

10. The on-line monitoring system for the state of the wheel cylinder of the trailer as claimed in claim 1, characterized in that: the first controller or the second controller comprises a neural network unit for judging pressure abnormity according to the collected pressure signals.