CN201410943Y - Brake system temperature automatic control device - Google Patents
Brake system temperature automatic control device Download PDFInfo
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- CN201410943Y CN201410943Y CN2009200432758U CN200920043275U CN201410943Y CN 201410943 Y CN201410943 Y CN 201410943Y CN 2009200432758 U CN2009200432758 U CN 2009200432758U CN 200920043275 U CN200920043275 U CN 200920043275U CN 201410943 Y CN201410943 Y CN 201410943Y
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Abstract
The utility model discloses a brake system temperature automatic control device, which comprises a temperature detection unit, a liquid level detection unit, a human-computer interface unit and a micro computer control unit, wherein the input end of the temperature detection unit is connected with the output end of a brake system, the output end of the temperature detection unit is connected withthe input end of the micro computer control unit, the micro computer control unit is connected with the human-computer interface unit in double directions, the output end of the micro computer controlunit is connected with the input end of each water cooling system of a vehicle, and the output end of the water cooling system is connected with the input end of the micro computer control unit afterbeing serially connected with the liquid level detection unit. The brake system temperature automatic control device improves the service life of the brake system and also improves the driving safetyof the vehicle.
Description
Technical field
Utility model relates to a kind of brake system automatic temperature control, belongs to the measurement and the control technology field of the temperature of brake and drive system for vehicle with tow.
Background technology
Automobile brake system is an extremely important part for vehicle.As everyone knows, the brake system of modern automobile all adopts the friction braking mode, produces required braking force by phase mutual friction between the working part.Therefore, in brake system, the stability of working part friction coefficient directly influences the safety of the stability and the vehicle ' of brake system work.
Owing to adopted the friction braking mode, in whole braking procedure, the mechanical energy of vehicle will be converted to heat energy and discharge, and cause the brake system temperature build-up, cause the heat fade phenomenon.Here so-called " heat fade phenomenon " refer to big when initial speed of braking, pressure increases, braking is frequent and when causing the brake system temperature build-up, a kind of phenomenon that the working part friction coefficient reduces.Owing to this reason, the vehicle braked performance can significantly descend even forfeiture, thereby produces safety misadventure.Simultaneously, too high temperature also very easily causes each working part oxidation of brake system, quickens accessory loss, reduces the service life of brake system.This class problem is gone through continuous descending highway section or particularly remarkable during for a long time in the relatively poor travels down of road conditions at vehicle.
At present,, increase brake system service life, improve vehicle safety, all done many research, and proposed some actual solutions both at home and abroad at how solving brake and drive system for vehicle with tow heat fade phenomenon.But these scheme major parts all are to start with from the material composition and the structural arrangement of drg, brake system is improved, and be not to solve the safety problem that the heat fade phenomenon is caused by brake and drive system for vehicle with tow is carried out suitable temperature control.
For example, aspect brake system working part material, for partial metallurgy class brake facing, because in this class working part, it is the key point that the heat fade phenomenon produces that the contained low-melting-point metal of material liquefies in hot environment, therefore, as long as control the content of low-melting-point metal well, or replace with other nonmetalloids, can guarantee powdered metallurgical material when possessing sufficient mechanical strength, also have good heat resistanceheat resistant decline ability.And,, can improve its heat decomposition temperature as long as improve the resistance to effect of heat of resin material for the resene brake facing, and delay to decompose and oxidation rate, like this, brake facing just can have stable frictional behaviour under hot environment.Use various phenol-formaldehyde resin modifieds can increase substantially the dissociation temperature of resin.
For the structural improvement of brake system, relatively be typically and be that vehicle increases retarder.Retarder is called as " the 4th drg " as the auxiliary braking parts of vehicle.It is used to solve train short range braking deceleration difficult problem the earliest.Afterwards, the Western European countries were with on its heavy wrecker truck and large and medium bus that is applied to express highway and mountain area travel, to improve the vehicle brake braking effect.At present retarder to be applied in developed country very extensive.The major advantage of this equipment is: the safety that 1) effectively improves vehicle ', reduce the generation of braking heat decline, 2) economy of raising vehicle operating (has prolonged the service life of brake system part, reduce maintenance cost), 3) alleviate the labour intensity of navigating mate, improve the traveling comfort of vehicle.At present, all kinds of retarders can be divided into electric vortex type, hydraulic type, magneto, slowing down speed of engine formula and electric motor type by its principle of work, and the latter only is used for electronlmobil and automobile with electric transmission.
Though much can effectively alleviate brake and drive system for vehicle with tow heat fade phenomenon, improve vehicle safety, the method that prolongs brake system service life is suggested, and during related hardware equipment also dropped into actual production and use.Simultaneously, China has also issued GB7258, GB12676 standard, comes all kinds of passenger vehicles of standard, lorry braking device, to improve the safety of vehicle '.But in real life, often price is higher to be used to solve the hardware device of this class problem, can increase operation cost after vehicle is installed, and, because the problem of some vehicles self for installing additional of this kind equipment, also needs other equipment in the vehicle are changed.Therefore, the actual outfit situation of this kind equipment is not very desirable.In addition, because this kind equipment much all is required condition to be taken place the heat fade phenomenon improve, postpone time of origin, or when the heat fade phenomenon takes place, provide certain safety guard-safeguard ancillary method.And and non-selected brake system is carried out temperature control, fundamentally remove the potential safety hazard that the heat fade phenomenon causes.Therefore, even be equipped with, can not well overcome the potential safety hazard that causes owing to the heat fade phenomenon sometimes such as hardware devices such as retarders.
For the vehicle driving safety hidden danger that causes because of the heat fade phenomenon, the most direct, effective, the most cheap solution still should be realized by brake system being carried out temperature control.
At present, though a lot of chaufeur can carry out cooling processing to brake system in the vehicle ' process, by control brake system temperature, eliminate the potential safety hazard that causes because of the heat fade phenomenon as far as possible, but owing to lack necessary hardware equipment, this process can only be by finishing manually.Chaufeur often needs the practical experience according to oneself, and after the stretch journey of whenever travelling, the vehicle that stops by methods such as natural cooling or water-cooleds, reduces the brake system temperature.Such way can make the too high situation of brake system temperature be eased to a certain extent, but owing to brake system is not carried out real-time monitoring temperature, simply by virtue of the personal experience, chaufeur often can't obtain a parking period accurately.It is very few to stop, and still can there be the too high problem of temperature in brake system, thus the potential safety hazard of causing; Stop too much, not only influenced work efficiency, increase oil consumption, more improved the working strength of chaufeur.Simultaneously, chaufeur also may be because individual's carelessness be carried out cooling processing and forgotten to the brake system of vehicle.
The utility model content
The utility model purpose is to provide a kind of brake system automatic temperature control at the defective that prior art exists.
The utility model adopts following technical scheme for achieving the above object:
The utility model brake system automatic temperature control, it is characterized in that comprising temperature detecting unit, the liquid level detecting unit, man machine interface unit and microcomputer control unit, the mouth of the input termination brake system of temperature detecting unit wherein, the input end of the output termination microcomputer control unit of temperature detecting unit, the microcomputer control unit is connected with the man machine interface unit is two-way, the input end of each water-cooling system of output termination vehicle of microcomputer control unit connects the input end of microcomputer control unit behind the mouth of the water-cooling system serial connection liquid level detecting unit.
The utility model adopts temperature sensor that automobile brake system is carried out real time temperature and detects, and by microcomputer according to detected temperature signal, generate control corresponding output, the brake system temperature is controlled.When the brake system temperature is too high, can realize the function of lowering the temperature automatically.The utility model not only can improve the service life of brake system, also can strengthen the safety of vehicle ' simultaneously, has certain value of service and application prospect.
Description of drawings
Fig. 1: the utility model structural representation.
Fig. 2: temperature sensor parasite power power supply circuit.
Fig. 3: external power source circuit diagram.
Fig. 4: near switch measuring head installation site figure.
Fig. 5: button inputting circuits figure.
Fig. 6: display circuit figure.
Fig. 7: mu balanced circuit figure.
Fig. 8: microcomputer basic circuit diagram.
Fig. 9: microcomputer control unit overall circuit figure.
The specific embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to utility model:
As shown in Figure 1, the brake system automatic temperature control, it is characterized in that comprising temperature detecting unit, the liquid level detecting unit, man machine interface unit and microcomputer control unit, the mouth of the input termination brake system of temperature detecting unit wherein, the input end of the output termination microcomputer control unit of temperature detecting unit, the microcomputer control unit is connected with the man machine interface unit is two-way, the input end of each water-cooling system of output termination vehicle of microcomputer control unit connects the input end of microcomputer control unit behind the mouth of the water-cooling system serial connection liquid level detecting unit.Mainly comprise four parts: temperature detecting unit, liquid level detecting unit, man machine interface unit, microcomputer control unit.The utility model utilizes the 12V automobile power source, powers to 5V by the voltage stabilizing of LM7805 chip.This system's support temperature multimetering detected the brake system temperature every one second, when temperature surpasses the setting boundary value, sent control signal by microcomputer, and brake system is carried out fixed fire formula spray cooling.Simultaneously, the utility model also provides easy high water tank measuring ability, when water tank lacks water, and the system closing function of lowering the temperature automatically, and send warning.When native system used in reality, flexible, temperature sensor was supported plug and play, need not to carry out complicated initialization.Simultaneously, system also provides a basic man machine interface unit, and the user can carry out the setting of temperature limit value, to reach different temperature control effects by this unit.Simultaneously, by the LED charactron, can carry out Real Time Observation to the temperature value of measuring gained.
The selection of detector unit is an extremely important link for designing detector unit accurately and efficiently.In the past, we usually adopted resistance to heat or thermocouple as the primary element of measuring, and by analogous circuit, temperature signal were converted to the curtage signal, re-used the A/D conversion, analog signal conversion is digital signal after, the input microcomputer is controlled.With this conceptual design temperature detecting unit, though also can realize basic temperature survey function, the hardware circuit complexity, it is more to take mouthful line, and system reliability is not high.Any one circuit link is dealt with improperly, all may reduce thermometric precision greatly, thereby influences the controller performance of whole temperature controlling system.
For this reason, in the utility model, the digital temperature sensor DS18B20 that adopts the release of American Dallas semiconductor company is as temperature-sensing element.
As shown in Figure 2, the hardware circuit design of sensor can be used parasite power feed circuit as shown in Figure 2.In this circuit, the power delivery of sensor and data transmission all realize by data line.In order to provide enough electric currents in the clock period at effective sensor, guarantee normal operation of sensor, need to increase a MOSFET and control.When sensor carries out temperature transition, send control signal by microcomputer to MOSFET, data line is drawn on by force, to reach power demands
[16]
Except that the parasite power feed circuit, also can use external power source circuit as shown in Figure 3.In this circuit, the data line of temperature sensor only is used for data transmission, and the required power supply of its work is provided by power pins institute bonded assembly external power supply.
Above-mentioned two kinds of circuit are compared, and the advantage of parasite power feed circuit is: 1) carry out remote temperature when detecting, need not local power supply, 2) when lacking the externally fed power supply, but sensor normal operation still.But, need take more mouth line, and control is complicated in order to realize these advantages.In the design, consider that the temperature survey distance is not far, and the failure-free external power source is arranged, in order to improve the reliability of system, reduce design difficulty, therefore, select for use the external power source circuit as the sensor hardware circuit.
As shown in Figure 4, the design of liquid level detecting unit starts the cooling function automatically, and brake system is carried out spray cooling.Therefore, need high water tank is monitored, prevent to cause the cooling failure because of water tank lacks water.Owing to need not to know concrete liquid level at this, as long as when water tank lacks water, produce alarm and get final product, use as basic detecting element so can select for use near switch.
Because in this element, measurand is a water, take all factors into consideration measurement effect and cost after, select condenser often to open near switch as detecting element.So-called capacitive approach switch mainly utilizes testee that the influence of specific inductance capacity is made.When actual detected, the measuring head of capacitive approach switch and testee constitute the two-plate of electric capacity, and when testee moved, specific inductance capacity changed, and make capacitance change.This change, just controllable switch turns on and off.
According to the above description, the measuring head near switch can be installed in the water tank bottom position, as shown in Figure 8.When water tank has water, near switch closure, and output corresponding signal, otherwise switch disconnects, no signal output.This output signal is done suitable level conversion, generate the liquid level detection signal.When water tank lacks water, the liquid level detection signal is a high level signal, otherwise, then be low level signal, microcomputer can detect the high water tank situation by this signal.
As shown in Figure 5,, allow the user regulate temperature control effect according to actual environment in order to strengthen temperature controlled alerting ability, but simultaneously also in order to allow user's Real Time Observation to measured temperature, so increased by a personal-machine interface unit.This unit is mainly realized the button input and is shown output two parts function.
For key input part, adopted three often to open button as entering apparatus, realize functions such as setting of temperature limit value and buzzer stop by these three buttons, the cooresponding concrete function of each button is listed in table 1.Each button links to each other with a pin of microcomputer.When button was pressed, circuit was connected, and signal input part produces low level input microcomputer.Otherwise, circuit breaker, incoming signal becomes high level.Microcomputer detects the corresponding port signal, if detect low level signal, then carries out corresponding function.
Table 1 keypress function table
As shown in Figure 6, for showing output, then adopt 4 common anode LED charactrons to realize temperature display function.2 to 4 of charactron are used to show in the synchronization, the maximum temperature numerical value that each temperature sensor is measured, and the 1st then shows the number of sensor that records this temperature value.In display circuit, microcomputer sends 7 sections to charactron and shows sign indicating number by pin a to g, and control shows numerical value.By LEDEN1 to LEDEN4 port, send the demonstration position to charactron and enable control signal simultaneously.In the actual displayed process, adopt the scan round method, enable each successively and show the position.When a certain position enables, send cooresponding 7 segment encodes of this required demonstration numerical value to charactron.When the scan round period regulation is suitable, utilize the persistence of vision phenomenon of human eye, just can produce at one time in, each shows that the position shows the phenomenon of corresponding numerical value.Utilize this point, can realize required Presentation Function.
The AT89C51 micro controller system closely links to each other with above-mentioned each hardware cell as the design's hardware core part.By microcomputer, realize control to each hardware cell.Hardware circuit design for this part is specific as follows.
As shown in Figure 7, can normal operation in order to make microcomputer, at first must provide the DC regulated power supply of 5V, and VPWR Vehicle Power supply voltage is 12V, if directly power, then can burn chip to microcomputer.Therefore, adopt LM7805 voltage stabilizing chip that automobile power source is carried out step-down and handle, voltage is adjusted to 5V after, power for microcomputer again.
As shown in Figure 8, the groundwork circuit of configuration microcomputer, specifically as shown in figure 12.This part configuration is divided into three steps, at first is the oscillating circuit setting.Oscillating circuit is used to produce the required clock signal of micro controller system work.After having taken all factors into consideration factors such as system performance requirement and cost, select the crystal oscillator of 12MHz and the electric capacity of 30pf to form oscillating circuit.By this circuit, the frequency of operation of microcomputer can reach 12MHz.After the first step of configuration is finished, the reset circuit of microcomputer need be set, in the design, use 10uf chemical capacitor and 8.2k resistance to form automatic electrify restoration circuit
[27], after system's energized, microcomputer carries out proper reset automatically.Last what dispose, need determine that also No. 31 pins of microcomputer keep high level, otherwise microcomputer can't be carried out the program in the sheet internal program memory device.
After the microcomputer basic circuit configuration finishes, need each hardware cell is connected with microcomputer, controlled, also need add simultaneously and join cooresponding indicator lamp, use to make things convenient for the user.For this a part of circuit layout specifically as shown in Figure 9.
In the drawings, the data line of 4 temperature sensors is linked to each other with 32 to No. 35 pins of microcomputer respectively, to carry out the information interaction operation, on 21 to No. 24 pins of microcomputer, be respectively cooresponding indicator lamp of each temperature sensor configuration simultaneously.When normal operation of sensor and when recording temperature and being lower than boundary value, indicator lamp normally lights; When temperature exceeding standard, the indicator lamp flicker is pointed out.For two level sensors, it is linked to each other with No. 8 of microcomputer and No. 13 pins, make 36, No. 37 indicator lamps on the pin corresponding simultaneously with it.When water tank has water, and during normal operation of sensor, indicator lamp lights; If water tank lacks water, then indicator lamp is pointed out with flashing mode equally.For being connected of microcomputer and man machine interface unit, then need emphasis that the selection that the SET button connects pin is illustrated.Consider in the practical application, the operating frequency that enters set condition and switch buzzer phone is lower, if when being in the measurement and control of temperature state in system, adopts the mode of timing scan to judge whether the SET key is pressed, expense to system resource is bigger, causes unnecessary waste.Therefore, the SET key is linked to each other with No. 12 pin of microcomputer, it is responded by external interrupt.In this circuit, the buzzer phone that also has been system configuration when water tank lacks water or brake system temperature exceed standard for a long time, just can be pointed out warning.At last, microcomputer generates cooresponding control signal according to the numerical value that each sensor acquisition arrives, and externally exports by 38, No. 39 pins.So far, each hardware cell design of system is all finished.
Claims (4)
1, a kind of brake system automatic temperature control, it is characterized in that comprising temperature detecting unit, the liquid level detecting unit, man machine interface unit and microcomputer control unit, the mouth of the input termination brake system of temperature detecting unit wherein, the input end of the output termination microcomputer control unit of temperature detecting unit, the microcomputer control unit is connected with the man machine interface unit is two-way, the input end of each water-cooling system of output termination vehicle of microcomputer control unit connects the input end of microcomputer control unit behind the mouth of the water-cooling system serial connection liquid level detecting unit.
2, brake system automatic temperature control according to claim 1 is characterized in that described temperature detecting unit adopts the external power source circuit.
3, brake system automatic temperature control according to claim 1 and 2, it is characterized in that described man machine interface unit comprises button inputting circuits and display output circuit, wherein button inputting circuits connects the input end of microcomputer control unit, and display output circuit connects the mouth of microcomputer control unit.
4, brake system automatic temperature control according to claim 1 and 2 is characterized in that it is the digital temperature sensor of DS18B20 that described temperature detecting unit adopts model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200432758U CN201410943Y (en) | 2009-06-25 | 2009-06-25 | Brake system temperature automatic control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200432758U CN201410943Y (en) | 2009-06-25 | 2009-06-25 | Brake system temperature automatic control device |
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| CN201410943Y true CN201410943Y (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200432758U Expired - Fee Related CN201410943Y (en) | 2009-06-25 | 2009-06-25 | Brake system temperature automatic control device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645938A (en) * | 2012-04-01 | 2012-08-22 | 上海大学 | Real-time temperature control system of automobile brake block |
| CN104019912A (en) * | 2014-06-25 | 2014-09-03 | 常英杰 | Intelligent temperature alarming system based on singlechip microcomputer |
| CN105043587A (en) * | 2015-05-29 | 2015-11-11 | 黑龙江大学 | Fiber bragg grating based special vehicle body temperature monitoring device |
| CN105752054A (en) * | 2016-03-31 | 2016-07-13 | 河南师范大学 | Intelligent cooling device of heavy truck brake system |
| CN110597320A (en) * | 2019-10-08 | 2019-12-20 | 西安航空制动科技有限公司 | Temperature controller with automatic cooling function and control method thereof |
-
2009
- 2009-06-25 CN CN2009200432758U patent/CN201410943Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645938A (en) * | 2012-04-01 | 2012-08-22 | 上海大学 | Real-time temperature control system of automobile brake block |
| CN104019912A (en) * | 2014-06-25 | 2014-09-03 | 常英杰 | Intelligent temperature alarming system based on singlechip microcomputer |
| CN105043587A (en) * | 2015-05-29 | 2015-11-11 | 黑龙江大学 | Fiber bragg grating based special vehicle body temperature monitoring device |
| CN105752054A (en) * | 2016-03-31 | 2016-07-13 | 河南师范大学 | Intelligent cooling device of heavy truck brake system |
| CN105752054B (en) * | 2016-03-31 | 2018-06-22 | 河南师范大学 | Brake system of truck Intelligent temperature reduction device |
| CN110597320A (en) * | 2019-10-08 | 2019-12-20 | 西安航空制动科技有限公司 | Temperature controller with automatic cooling function and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20120625 |