CN110864060B - High-sensitivity drum brake high-temperature alarm sensing system and code matching debugging method thereof - Google Patents
High-sensitivity drum brake high-temperature alarm sensing system and code matching debugging method thereof Download PDFInfo
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- CN110864060B CN110864060B CN201911084801.XA CN201911084801A CN110864060B CN 110864060 B CN110864060 B CN 110864060B CN 201911084801 A CN201911084801 A CN 201911084801A CN 110864060 B CN110864060 B CN 110864060B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/001—Temperature
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- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
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Abstract
The invention discloses a high-sensitivity drum brake high-temperature alarm sensing system and a code matching debugging method, wherein the system comprises an alarm device and a plurality of sensing devices, each sensing device comprises a temperature control switch, a wireless transceiving module, a battery unit and a heat insulation protective shell, when the temperature of a brake drum exceeds a preset threshold value, the temperature control switch triggers the wireless transceiving module to send out a wireless alarm signal with a code to the alarm device, a voice module is arranged in the alarm device, and when the alarm device receives the wireless alarm signal with the code, voice alarm information corresponding to the wireless alarm signal with the code is played through the voice module. The effect is as follows: compact structure, simple to operate, the security is good, can effectively be applicable to car wheel drum high temperature operational environment, low-power consumption, and battery duration is strong, and temperature-sensing is more accurate moreover.
Description
Technical Field
The invention relates to an automobile electronic product, in particular to a high-sensitivity drum brake high-temperature alarm sensing system and a code matching debugging method thereof.
Background
Drum brakes have been used in automobiles for a century ago, but are still being deployed today on many models (mostly for rear wheels) due to their reliability and strong braking force. It is fixed to the tyre and rotates at the same speed. During braking, the brake shoe is pushed by hydraulic pressure to contact the inner edge of the brake drum, and the friction force generated by the contact is used to restrain the rotation of the tire so as to achieve the purpose of braking. The drum brake consists of a brake bottom plate, a brake cylinder, a brake shoe and other relevant connecting rods, a spring, a pin nail and a brake drum. Currently, the rear wheel is generally mounted. The drum brake has low cost and high absolute braking force, and the inner surface of the brake drum of the drum brake is the position of the brake device for generating brake torque. The diameter of the brake drum of a drum brake assembly can be much smaller than the diameter of the brake disc of a disc brake assembly to achieve the same braking torque. Therefore, large vehicles for heavy loads can only be equipped with drum brakes in a limited space of the rim in order to obtain a strong braking force.
However, the diameter of the brake drum of the drum brake is increased after the brake drum is heated, so that the stroke of stepping on the brake pedal is increased, and the brake reaction is easy to happen to be not as expected. Therefore, when a vehicle adopting drum brakes is driven, the phenomenon that the brake pad is subjected to heat fading due to high temperature caused by continuous braking is avoided as much as possible. There are also medium reports that the brake drum of many trucks is overheated to cause major safety accidents such as brake failure, spontaneous combustion of tires, vehicle explosion, etc.
In view of the above, many researchers have proposed the related art for monitoring the temperature of the brake drum, such as a device for monitoring the temperature of the brake drum of a large truck disclosed in chinese patent 201120039699.4, and a method and a device for measuring the temperature of the brake drum of an automobile by using a contact thermistor disclosed in chinese patent 201310355354.3. The temperature of the brake drum of the automobile is obtained through equipment such as a thermal infrared sensor or a thermistor, and therefore brake high-temperature alarming is achieved.
The wheel has a severe running environment, and particularly when the wheel runs on a road with sludge and riprap, the thermal infrared sensor is easy to damage, so that monitoring failure is caused; secondly, various monitoring devices have weak protection measures, and the monitoring devices are easily melted at high temperature under the high-temperature state of the brake drum; thirdly, the energy consumption of various existing monitoring devices is large, the endurance capacity of a common battery is insufficient, and the power supply of the devices is often insufficient due to untimely maintenance.
Disclosure of Invention
Based on the above defects, the first objective of the present invention is to provide a high-sensitivity drum brake high-temperature alarm sensing system which has a simple structure, is convenient to install, and can be safely operated for a long time.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-sensitivity drum brake high-temperature alarm sensing system is characterized by comprising an alarm device and a plurality of sensing devices wirelessly connected with the alarm device, the sensing device comprises a temperature control switch for sensing the temperature of the brake drum, a wireless transceiver module for sending a high-temperature alarm signal, a battery unit for supplying power to the wireless transceiver module, and a heat insulation protective shell for accommodating the wireless transceiver module and the battery unit, when the temperature of the brake drum exceeds a preset threshold value, the temperature control switch triggers the wireless transceiving module to send out a wireless alarm signal with codes to the alarm device, a voice module is arranged in the alarm device, when the alarm device receives the wireless alarm signal with the code, the voice alarm information corresponding to the wireless alarm signal with the code is played through the voice module.
The temperature control switch is adopted to sense the temperature change condition of the brake drum wheel, when the temperature exceeds a preset range, the state of the temperature control switch can be changed, and then the wireless transceiving module is triggered to send alarm information based on the state change of the temperature control switch; under the temperature normal condition, wireless transceiver module is in low-power consumption dormant state, can effectively prolong battery unit's life, adopt wireless transmission and insulate against heat and protect wireless transceiver module and battery unit by thermal-insulated protective housing, can prevent to damage, ensure that the circuit normally works, each induction system sends out the wireless alarm signal of area code, alarm device can take the measure of dealing with in time through the unusual concrete position of voice broadcast temperature, the driver of being convenient for.
Optionally, a heat conduction member for attaching to the brake drum is connected to the heat insulation protective shell, a heat conduction cavity is formed in the heat conduction member, the temperature control switch is arranged in the heat conduction cavity, and heat conduction oil is filled in the heat conduction cavity.
Optionally, the heat conducting cavity is formed by enclosing the heat conducting member and an outer wall of the heat insulation protective shell.
Optionally, the temperature-controlled switch is a normally open or normally closed bimetallic strip switch.
Optionally, the wireless transceiver module includes a wireless transceiver chip of the model CMT2150L, and a crystal oscillator module, an antenna circuit, and a power supply filter circuit are connected to the wireless transceiver chip.
Optionally, the number of the sensing devices is 2-16, and is suitable for the number of the applied vehicle brake drums.
Optionally, the heat conducting member is provided with an abutting surface adapted to a drum surface of the brake drum, and the heat conducting member is closely abutted to the drum surface of the brake drum and is welded and fixed.
Optionally, the antenna of the wireless transceiver module is embedded in the heat insulation protective shell, and the heat insulation protective shell is made of a non-electromagnetic shielding material.
Optionally, the alarm device includes a storage module and a data interface, the storage module is configured to store alarm record information, and the data interface is configured to derive storage information in the storage module.
Based on the system, the invention also provides a code matching debugging method, which is carried out according to the following steps:
s1: pre-storing N pieces of debugging voice prompt information and corresponding alarm voice prompt information in the alarm device according to a preset sequence;
s2: clearing the paired coded information by long pressing the first key, and entering a code matching debugging process;
s3: the value of the counter n is adjusted by pressing a first key for a short time, two wiring terminals of the temperature control switch are triggered to be in short circuit, the temperature control switch in the sensing device is enabled to send out a wireless alarm signal with codes, and a normally-open bimetallic strip switch is selected as the temperature control switch;
s4: when the alarm device receives the wireless alarm signal with the code, the received wireless alarm signal with the code and the nth section of alarm voice prompt information are broadcasted through the voice module, and the corresponding debugging voice prompt information is broadcasted;
s5: confirming the associated alarm information through a second key, and entering an alarm monitoring process;
s6: in the process of alarm monitoring, when the alarm device receives any one associated wireless alarm signal with codes, the voice module broadcasts corresponding alarm voice prompt information.
The invention has the following remarkable effects:
compact structure, simple to operate, the security is good, can effectively be applicable to car wheel drum high temperature operational environment, low-power consumption, battery duration is strong, and temperature-sensing is more accurate moreover, can give corresponding audio alert suggestion to high temperature abnormal position.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
Fig. 1 is a diagram of the topology of the system of the present invention.
Fig. 2 is a schematic block diagram of the system circuitry of the present invention.
FIG. 3 is a diagram of an installation configuration of an induction device in an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an inductive device in accordance with an embodiment of the present invention;
fig. 5 is a flow chart of a method of the present invention.
The labels in FIG. 3 are: the device comprises a temperature control switch 1, a wireless transceiving module 2, a battery unit 3, a heat insulation protective shell 4, a heat conducting piece 5 and heat conducting oil 6.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, the invention provides a high-sensitivity drum brake high-temperature alarm sensing system, which includes 1 alarm device and N sensing devices wirelessly connected to the alarm device, wherein the number of the sensing devices is adapted to the number of applied vehicle brake drums, and the sensing devices can support 16 channels at most, i.e. N can be 16, and can independently detect the brake of each tire.
As can be seen from fig. 2 and 3, the sensing device includes a temperature control switch 1 for sensing the temperature of the brake drum, a wireless transceiver module 2 for sending a high temperature alarm signal, a battery unit 3 for supplying power to the wireless transceiver module, and a heat insulation protective housing 4 for accommodating the wireless transceiver module 2 and the battery unit 3, when the temperature of the brake drum exceeds a preset threshold, the temperature control switch 1 triggers the wireless transceiver module 2 to send a coded wireless alarm signal to the alarm device, and the coded wireless alarm signal corresponds to the installation position of the alarm device; the alarm device is provided with a voice module, and when the alarm device receives the wireless alarm signal with the code, voice alarm information corresponding to the wireless alarm signal with the code is played through the voice module.
As shown in fig. 4, in this embodiment, the temperature control switch 1 may adopt a normally open or normally closed bimetallic strip switch, as an implementation manner, a closed temperature controller with a model number of KSD9700 is adopted, the wireless transceiver module 2 includes a wireless transceiver chip with a model number of CMT2150L, the temperature control switch 1 is connected between a switch signal pin of the wireless transceiver chip and a power ground terminal, the wireless transceiver chip is connected with a crystal oscillator module, an antenna circuit and a power filter circuit, and the battery unit adopts a button battery. As can be seen from fig. 2, in the drawing, Y1 denotes a crystal oscillator module, which provides a clock signal for the wireless transceiver chip, VCC provides a working power supply for the button battery, an antenna circuit is formed by the inductor L1, the inductor L2, the capacitor C1, and the capacitor C2, and is used for transmitting a wireless signal outwards, the capacitor C0 and the capacitor C5 are power filter circuits, and the temperature-controlled switch 1 is equivalent to the switch element K1. In a low-temperature state, the switch is closed, and a switch signal pin of the wireless transceiving chip is grounded, so that a low-power-consumption dormant state is maintained; along with the rise of temperature, the inside of the temperature control switch 1 deforms, when the preset temperature threshold value is reached, the temperature control switch 1 is automatically switched off, the wireless transceiver chip receives a switch trigger signal, automatically wakes up to send a section of wireless signal, receives the final draft and can make an alarm response by receiving the wireless signal, so that a driver is prompted to pay attention to the temperature of the wheel drum, and timely treatment measures are convenient to take.
As another embodiment, the temperature control switch 1 is a normally open switch, is connected in series with a power line, is disconnected at low temperature, and is powered on only at high temperature to trigger the wireless transceiver chip to work, so that energy consumption is saved.
As can also be seen from fig. 3, in order to enable the temperature control switch 1 to more accurately sense the temperature of the automobile wheel drum, the heat-conducting member 5 for attaching to the brake drum wheel is connected to the heat-insulating protective shell 4, a heat-conducting cavity is formed on the heat-conducting member 5, the temperature control switch 1 is arranged in the heat-conducting cavity, and heat-conducting oil 6 is further filled in the heat-conducting cavity.
The temperature control switch 1 can be directly attached to the brake drum wheel, but the contact surface is limited, so that on one hand, the fixation is inconvenient, and the product is easy to fall off; on the other hand, the heat conduction efficiency is low, the temperature detection is inaccurate, and the heat conduction piece 5 is additionally arranged, so that the installation and the fixation are convenient, and the falling-off is prevented; and the contact area can be increased, the heat conduction efficiency is improved, meanwhile, the temperature control switch 1 is completely coated by the heat conduction oil 6, and the detection precision is higher.
In specific implementation, the heat conducting cavity may be formed by enclosing the heat conducting member 5 and the outer wall of the heat insulating protective shell 6. Also can independently set up the heat conduction chamber, in advance with temperature detect switch 1 built-in the heat conduction intracavity, then be connected fixedly with thermal-insulated protective housing 6 with heat-conducting piece 5 again.
In order to facilitate installation, the heat conducting piece 5 is provided with a binding surface matched with the drum surface of the brake drum wheel, the heat conducting piece is tightly attached to the drum surface of the brake drum wheel and is welded and fixed, and during specific implementation, a high-temperature resistant magnet and a high-temperature adhesive can be used for adhesion and fixation.
In order to ensure the normal transmission of wireless signals, the antenna of the wireless transceiver module 2 is embedded in the heat-insulating protective shell 4, and the heat-insulating protective shell 4 is made of a non-electromagnetic shielding material. The antenna of the wireless transceiver module 4 can also be directly led out of the heat insulation protective shell 4, so that the attenuation of the shell to signals is reduced.
As can also be seen from fig. 2, the alarm device includes a storage module for storing alarm record information and a data interface for deriving the stored information in the storage module. The alarm information triggered each time is recorded in the storage module as an alarm log and can be directly read through a data interface (such as a USB interface) so as to verify the reliability of the system, and if a driver does not take mandatory measures after the alarm, the driver can trace the responsibility by reading corresponding data.
Based on the above system, this embodiment further provides a code matching method, and in the specific implementation, the first key may be defined as a code matching key, the second key may be defined as a monitoring key, and based on the circuit block diagram shown in fig. 2, the controller of the alarm device may further be connected to an LED display module, for example, a 16-channel temperature monitoring, and the LED display module may generally employ a 2-digit nixie tube.
As shown in fig. 5, during code matching debugging, a code matching debugging process is started by pressing a first key for a long time, the long time is usually greater than 3s, the system automatically sets a counter n to 1, and 16 pieces of debugging voice prompt information and corresponding alarm voice prompt information are prestored in the alarm device according to a preset sequence, as shown in table 1:
table 1: voice prompt information table
In the code matching debugging process, the value of a counter n is adjusted by pressing a first key for a short time, a user adjusts the value of the counter n according to the position where a current sensing device is installed, and then two wiring terminals of a temperature control switch are triggered to be in short circuit to enable the temperature control switch to send out a wireless alarm signal with codes, and for the convenience of code matching, the temperature control switch in the sensing device is a normally-open bimetallic strip switch; when the alarm device receives the wireless alarm signal with the code, the received wireless alarm signal with the code and the nth section of alarm voice prompt information are broadcasted through the voice module, and the corresponding debugging voice prompt information is broadcasted;
as can be seen from the flowchart shown in fig. 5, in the code matching debugging process, the counter n can be sequentially cycled between 1 and 16 by pressing the first key for a short time, and after the code matching is successful, the associated alarm information is confirmed by the second key, and the alarm monitoring process is started;
in the process of alarm monitoring, when the alarm device receives any one associated wireless alarm signal with codes, the voice module broadcasts corresponding alarm voice prompt information.
Through the process, the code matching program configured in the system is matched with simple key operation to finish the modification of the associated information, the program does not need to be rewritten, particularly, the hardware equipment can be conveniently replaced and the associated information in the software can be updated under the condition that a certain induction device is damaged, and the use and the maintenance are more convenient.
In conclusion, according to the high-sensitivity drum brake high-temperature alarm sensing system and the code matching method provided by the invention, the sensing device can be integrally packaged at one time, can be safely and stably applied to the brake drum, is high-temperature resistant, impact resistant, low in power consumption, long in service life, capable of accurately sensing the temperature of the brake drum, and capable of realizing high-temperature alarm by sending out a wireless signal, and is convenient to install and control, capable of effectively prompting drivers and passengers to take danger avoiding measures in time, and capable of reducing accident risks.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A high-sensitivity drum brake high-temperature alarm sensing system is characterized by comprising an alarm device and a plurality of sensing devices wirelessly connected with the alarm device, the sensing device comprises a temperature control switch for sensing the temperature of the brake drum, a wireless transceiver module for sending a high-temperature alarm signal, a battery unit for supplying power to the wireless transceiver module, and a heat insulation protective shell for accommodating the wireless transceiver module and the battery unit, when the temperature of the brake drum exceeds a preset threshold value, the temperature control switch triggers the wireless transceiving module to send out a wireless alarm signal with codes to the alarm device, a voice module is arranged in the alarm device, when the alarm device receives the wireless alarm signal with the code, voice alarm information corresponding to the wireless alarm signal with the code is played through the voice module;
the heat insulation protection shell is connected with a heat conduction piece used for being attached to a brake drum wheel, a heat conduction cavity is formed in the heat conduction piece, the temperature control switch is arranged in the heat conduction cavity, and heat conduction oil is filled in the heat conduction cavity.
2. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1, wherein the heat conducting cavity is formed by enclosing the heat conducting member and an outer wall of the heat insulation protective shell.
3. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1 or 2, wherein the temperature controlled switch is a normally open or normally closed bimetallic switch.
4. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1, wherein the wireless transceiver module comprises a wireless transceiver chip of a model number of CMT2150L, and a crystal oscillator module, an antenna circuit and a power supply filter circuit are connected to the wireless transceiver chip.
5. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1, wherein the number of the sensing devices is 2-16, and is suitable for the number of applied vehicle brake drums.
6. The high sensitivity drum brake high temperature alarm sensing system of claim 1, wherein the thermally conductive member is provided with an abutment surface adapted to the drum surface of the brake drum, and the thermally conductive member is in close contact with and welded to the drum surface of the brake drum.
7. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1, wherein the antenna of the wireless transceiver module is embedded in the heat insulation protective shell, and the heat insulation protective shell is made of a non-electromagnetic shielding material.
8. The high-sensitivity drum brake high-temperature alarm sensing system according to claim 1, wherein the alarm device comprises a storage module and a data interface, the storage module is used for storing alarm record information, and the data interface is used for deriving the stored information in the storage module.
9. The code matching debugging method of the high-sensitivity drum brake high-temperature alarm sensing system according to any one of claims 1-8, comprising the following steps:
s1: pre-storing N pieces of debugging voice prompt information and corresponding alarm voice prompt information in the alarm device according to a preset sequence;
s2: clearing the paired coded information by long pressing the first key, and entering a code matching debugging process;
s3: the value of the counter n is adjusted by pressing a first key for a short time, two wiring terminals of the temperature control switch are triggered to be in short circuit, the temperature control switch in the sensing device is enabled to send out a wireless alarm signal with codes, and a normally-open bimetallic strip switch is selected as the temperature control switch;
s4: when the alarm device receives the wireless alarm signal with the code, the received wireless alarm signal with the code and the nth section of alarm voice prompt information are broadcasted through the voice module, and the corresponding debugging voice prompt information is broadcasted;
s5: confirming the associated alarm information through a second key, and entering an alarm monitoring process;
s6: in the process of alarm monitoring, when the alarm device receives any one associated wireless alarm signal with codes, the voice module broadcasts corresponding alarm voice prompt information.
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