CN101704364B - Real-time monitoring and automatic regulating system of automotive brake clearance - Google Patents
Real-time monitoring and automatic regulating system of automotive brake clearance Download PDFInfo
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- CN101704364B CN101704364B CN2009101546021A CN200910154602A CN101704364B CN 101704364 B CN101704364 B CN 101704364B CN 2009101546021 A CN2009101546021 A CN 2009101546021A CN 200910154602 A CN200910154602 A CN 200910154602A CN 101704364 B CN101704364 B CN 101704364B
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Abstract
The invention discloses a real-time monitoring and automatic regulating system of automotive brake clearance, comprising a brake clearance sensor, a brake system working condition sensor, a brake system working condition sensor, an electrical control unit (ECU), a terminal display device, an electric adjusting arm, wherein, the brake clearance sensor is arranged on a brake shoe component of a drum-type cam brake; the brake system working condition sensor is arranged on an air braking main valve; the ECU is used for collecting and processing brake clearance of each brake; the terminal display device is used for displaying brake clearance value in real time and setting preset clearance and alarming failure; the electric adjusting arm is used for automatically adjusting the execution mechanism of brake clearance; and a signal transmission line of the ECU is used for connection. The system of the invention real-time monitors and intensively displays the brake clearance of each brake in the traveling process of the automobile, can realize feedback bidirectional regulation and failure alarm of the brake clearance, and timely find and reduce potential safety hazard caused by unreasonable brake clearance; and the preset clearance of each brake is set by terminal display equipment, thus the operation is more convenient. The system of the invention has simple structure, small volume and lower cost and is more reliable.
Description
Technical field
The present invention relates to the car brake system, particularly relate to a kind of automotive brake clearance monitoring and variotrol in real time.
Background technology
The reliability of car brake system is the key element of vehicle safety travel, guarantees that rational brake clearance is the necessary condition of brake system car load work.For the air braking system that is equipped with S type cam drum type brake, owing to need frequent braking in the driving process, can make the drg heating, brake wheel, the expansions such as brake shoe assembly that brake lining is housed can make brake clearance diminish; And the long-term use meeting becomes big because of brake pad wear can cause brake clearance.If untimely adjustment, can cause a little stopping, drag stop, phenomenons such as brake wheel loses circle, brake wheel be full of cracks, cause hidden danger to driving.Therefore, the situation of change of monitoring each drg brake clearance in real time is very important, particularly for having potential bigger heavy duty truck and the passenger vehicle of harm out of control.The automatic compensation arm then is to aim at S type cam drum type brake brake clearance to be remained in the reasonable value scope automatically and design-calculated parts assembly.Present automatic compensation arm is actually a kind of machinery automatic control system of open loop, usually only limit to automatic compensation to the brake pad wear amount, promptly can only carry out unidirectional adjusting to brake clearance, this also is the one of the main reasons that causes the brake wheel be full of cracks or occur phenomenons such as blowing out in the vehicle ' process.In addition, no matter be to adopt push rod stroke principle or adopt gap monitoring principle design-calculated automatic compensation arm, in fact be not to be by directly monitoring the control brake gap to make brake clearance remain on a certain steady state value scope to brake clearance.The former thinks that the wearing and tearing of brake lining will inevitably make the push rod stroke of piston or air chamber produce an increment, it is based on the automatic guidance of this increment, has ignored the influence to the stroke increment such as excess gap that the brake control lever housing produces and elasticity corner, the elasticity corner of brake shoe brake cheek, the elasticity corner of cam drive axle; The latter thinks that the wearing and tearing of brake lining will inevitably make drive cam shaft produce a corner increment, it has eliminated the excess gap of brake control lever housing generation and the influence of elasticity corner to a certain extent, but several influences to degree of regulation and reliability in back still exist.This also is one of defective of this open loop machinery automatic control system existence.
Along with application and the development of sensor technology and electronic auto-control technology at automotive field, as far back as the nineties in last century, patent US4749063 has just proposed a kind of implementation method of car brake brake clearance closed loop automatic control system of mechanical, electrical, the gas integral that changes based on direct in real time brake monitoring gap value.This method has adopted a kind of gas flow sensor, makes the drg brake clearance remain on a certain steady state value scope by collection, processing and controlled reset to the compressed air require variable signal that flows through brake clearance.But this method exists some defectives: since pressure gas to factor affecting such as the sensivity of environment, hysteresis qualitys the sensitivity of gas flow sensor and reliability etc., and the volume ratio of this class sensor is bigger; In addition, it is just reported to the police to the undue wear of brake lining, the brake clearance value of vehicle operating process is not implemented to show.
In fact, the enforcement monitoring and the demonstration of each drg brake clearance are very important, particularly for heavy duty truck and passenger vehicle, can find the potential safety hazard that drg may occur in early days, and the minimizing accident takes place as far as possible.Patent US479214, US4800991, US6135242 etc. adopt the brake clearance indicating device of mechanical type based on the push rod stroke, need each wheel to go out one by one to observe under the situation of stopping, very inconvenience at every turn; Patent US5252735, US6341670 etc. have adopted electronic sensor and microcomputer to handle to monitor and the brake clearance of each drg of centralized displaying vehicle, but they remain based on to the perception of push rod stroke variable quantity, fail effectively to eliminate the influence to monitoring result such as excess gap that aforementioned analysis such as brake control lever housing produces and elasticity corner, the elasticity corner of brake shoe brake cheek, the elasticity corner of cam drive axle.
Summary of the invention
It is problem at the brake clearance monitoring and the automatic guidance existence of the automobile that is equipped with the drum-type camb brake, a kind of automotive brake clearance monitoring and variotrol have in real time been the purpose of this invention is to provide, comprise the live signal that adopts electromagnetic eddy formula gap sensor to come each drg brake clearance of collection vehicle, utilize ECU to handle then, and realize that the real-time demonstration of each drg brake clearance, automatically regulating report to the police to the preset value scope or to the fault drg collecting signal.
Purpose of the present invention can realize by following technical proposal:
The present invention includes the brake clearance sensor that is arranged on the drum-type camb brake brake shoe assembly, be arranged in the brake system mode of operation sensor on the compressed air brake main valve, be used for the collection of each drg brake clearance signal, the electronic control unit ECU of processing, the terminal display device that is used for the demonstration in real time of brake clearance value and prepsetting gap setting and fault alarm is as the electronic adjusting arm of automatically regulating brake clearance actuating unit; Electronic control unit ECU is connected with signal transmssion line with brake clearance sensor, brake system mode of operation sensor, terminal display device, electronic adjusting arm respectively.
Brake clearance sensor on the described brake shoe assembly is 1, or 2～3 are arranged on the circumferencial direction of brake shoe assembly uniformly.
Described electronic control unit ECU comprises collecting sensor signal loop, operational loop, electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit, power supply and monitoring loop thereof; Operational loop is connected by system bus with collecting sensor signal loop, electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, working clearance storage/show circuit, power supply and monitoring loop thereof respectively; The collecting sensor signal loop is connected by signal transmssion line with brake clearance sensor, brake system mode of operation sensor; Prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit are connected by signal transmssion line with terminal display device; Servomotor is connected by signal transmssion line in electronic adjusting arm control loop and each electronic adjusting arm.
Described electronic adjusting arm comprises servomotor, bearing cap shim, fast coupling, worm screw, worm gear and adjusting arm housing; The worm screw that the adjusting arm enclosure interior is equipped with fast coupling and connects with it is with the intermeshing worm gear of worm screw; Servomotor is fixed on the adjusting arm housing by joint bolt, and bearing cap shim is placed between the conjunction plane of servomotor and adjusting arm housing, is used to adjust the endplay between driven by servomotor axle and fast coupling, worm screw and the adjusting arm housing.
The beneficial effect that the present invention has is:
Can in vehicle traveling process, monitor in real time and each drg brake clearance of centralized displaying automobile, and can realize bidirectional modulation and the fault alarm of brake clearance reaction type, can in time find and reduce the potential safety hazard that causes because of brake clearance is unreasonable; Set the prepsetting gap of each drg, more convenient operation by distinction display apparatus; Brake clearance adopts the electromagnetism turbine sensor, adopts the system of gas flow formula brake clearance sensor to compare with existing, simple in structure, volume is little, more reliable; Adopt electronic control unit ECU as centralized signal conditioning, automatic control mode, compare with adopting the separation type electronic controller, cost is lower.
Description of drawings
Fig. 1 is vehicle brake gap monitoring and a variotrol arrangement plan in real time; Dotted line is a signal wire (SW), and heavy line is the pneumatic tube route.
Fig. 2 is that inner structure and the external equipment of electronic control unit ECU connects block diagram.
Fig. 3 is electronic adjusting arm constructional drawing.
Fig. 4 is the diagram of circuit of the implementation method of vehicle brake gap monitoring in real time and variotrol.
Among the figure: 1, compressed air brake main valve, 2, brake system mode of operation sensor, 3, the drum-type camb brake, 4, brake clearance sensor, 5, electronic adjusting arm, 6, electronic control unit ECU, 7, terminal display device, 8, servomotor, 9, bearing cap shim, 10, fast coupling, 11, worm screw, 12, worm gear, 13, the adjusting arm housing, 14, system merit drum surface, 15, brake shoe assembly, 16, brake lining, FL, propons left wheel, FR, the right wheel of propons, RL, back axle left wheel, RR, the right wheel of back axle, A, power lead, B, signal wire (SW), C, brake clearance.
The specific embodiment
As Fig. 1, Fig. 2, shown in Figure 3, the present invention includes the brake clearance sensor 4 that is arranged on drum-type camb brake 3 brake shoe assemblies, be arranged in the brake system mode of operation sensor 2 on the compressed air brake main valve 1, be used for the collection of each drg brake clearance signal, the electronic control unit ECU 6 of processing, the terminal display device 7 that is used for the demonstration in real time of brake clearance value and prepsetting gap setting and fault alarm is as the electronic adjusting arm 5 of automatically regulating brake clearance actuating unit; Electronic control unit ECU 6 is connected with brake clearance sensor 4, brake system mode of operation sensor 2, terminal display device 7, electronic adjusting arm 5 usefulness signal transmssion lines respectively.Brake system mode of operation sensor 2 is devices of a kind of similar travel switch.
Described electronic control unit ECU 6 comprises collecting sensor signal loop, operational loop (microcomputer), electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit, power supply and monitoring loop thereof; Operational loop is connected by system bus with collecting sensor signal loop, electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, working clearance storage/show circuit, power supply and monitoring loop thereof respectively; The collecting sensor signal loop is connected by signal transmssion line with brake clearance sensor, brake system mode of operation sensor; Prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit are connected by signal transmssion line with terminal display device; Servomotor is connected by signal transmssion line in electronic adjusting arm control loop and each electronic adjusting arm.
Described electronic adjusting arm 5 comprises servomotor 8, bearing cap shim 9, fast coupling 10, worm screw 11, worm gear 12 and adjusting arm housing 13; The worm screw 11 that adjusting arm housing 13 inside are equipped with fast coupling 10 and are connected with it is with worm screw 11 intermeshing worm gears 12; Servomotor 8 is fixed on the adjusting arm housing 13 by joint bolt, bearing cap shim 9 is placed between the conjunction plane of servomotor 8 and adjusting arm housing 13, is used to adjust the endplay between servomotor 8 axle drive shafts and fast coupling 10, worm screw 11 and the adjusting arm housing 13.When electronic adjusting arm is worked, the driven by servomotor axle will rotatablely move by fast coupling and pass to worm screw, the engagement of worm and worm wheel drives the worm gear rotation, and the angle of camshaft rotation that drives the drum-type camb brake is simultaneously finished the adjusting of brake clearance to the prepsetting gap value.
Principle of work of the present invention is as follows:
In vehicle traveling process, braking procedure be defined as a kind of from chaufeur step on the braking main valve brake pedal to the process that is totally released brake pedal.The flow process of the implementation method of monitoring in real time of this vehicle brake gap and variotrol is as shown in Figure 4:
In vehicle traveling process, when each braking procedure finishes, the brake system mode of operation sensor 2 that is arranged on the compressed air brake main valve 1 will send the work energizing signal of monitoring in real time of this vehicle brake gap and variotrol to electronic control unit ECU6, electronic control unit ECU6 begins to gather the brake clearance signal that the brake clearance sensor 4 of each drg obtains, and electronic control unit ECU6 handles according to the following steps to the brake clearance signal of gathering each drg that obtains immediately:
1. the brake clearance value with each drg is shown on distinction display apparatus 7;
2. the brake clearance value with each drg compares with the default separately brake clearance value that before was stored among the electronic control unit ECU6 respectively: if the brake clearance value of each drg is all being preset in the scope of brake clearance value separately, then turn to step 5, otherwise continue step 3;
3. if the brake clearance value of a certain drg exceeds the scope of its default brake clearance value, but be positioned at system's variable range, then continue step 4, it is carried out fault alarm otherwise send failure alarm signal to distinction display apparatus 7;
4. the drg brake clearance on propons left wheel FL, the right wheel FR of propons, back axle left wheel RL and the right wheel RR of back axle can be regulated respectively, its control process is the same, here be example with the drg on the right wheel RR of back axle, the brake clearance value that it records is in system's variable range, electronic control unit ECU6 sends impulse singla according to the brake clearance value and the servomotor of the difference between its default brake clearance in electronic adjusting arm 5 of this drg, starts electronic adjusting arm 5 and carries out the brake clearance adjusting.In control process, the brake clearance sensor in this drg is the brake clearance signal after electronic control unit ECU6 send to regulate constantly, till it is in the scope of default brake clearance value of this drg.
5. monitoring in real time of this vehicle brake gap and variotrol one action process are finished.
No matter be, can set and adjust by the default brake clearance that distinction display apparatus 7 carries out each drg at vehicle traveling process or at the parking of automobile state.
Claims (1)
1. an automotive brake clearance is monitored and variotrol in real time, comprise the brake clearance sensor (4) that is arranged on drum-type camb brake (3) brake shoe assembly, be arranged in the brake system mode of operation sensor (2) on the compressed air brake main valve (1), be used for the collection of each drg brake clearance signal, the electronic control unit ECU (6) of processing, the terminal display device (7) that is used for the demonstration in real time of brake clearance value and prepsetting gap setting and fault alarm is as the electronic adjusting arm (5) of automatically regulating brake clearance actuating unit; Electronic control unit ECU (6) is connected with signal transmssion line with brake clearance sensor (4), brake system mode of operation sensor (2), terminal display device (7), electronic adjusting arm (5) respectively; It is characterized in that:
Brake clearance sensor (4) on the described brake shoe assembly adopts electromagnetic eddy formula gap sensor, and it is 1, or it is 2～3 and arranges uniformly on the circumferencial direction of brake shoe assembly;
Described electronic control unit ECU (6) comprises collecting sensor signal loop, operational loop, electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit, power supply and monitoring loop thereof; Operational loop is respectively with collecting sensor signal loop, electronic adjusting arm control loop, prepsetting gap setting/store loop, fault alarm loop, brake clearance storage/show circuit, power supply and monitoring loop thereof are connected by system bus in real time; The collecting sensor signal loop is connected by signal transmssion line with brake clearance sensor, brake system mode of operation sensor; Prepsetting gap setting/store loop, fault alarm loop, real-time brake clearance storage/show circuit are connected by signal transmssion line with terminal display device; Servomotor is connected by signal transmssion line in electronic adjusting arm control loop and each electronic adjusting arm;
Described electronic adjusting arm (5) comprises servomotor (8), bearing cap shim (9), fast coupling (10), worm screw (11), worm gear (12) and adjusting arm housing (13); The worm screw (11) that adjusting arm housing (13) inside is equipped with fast coupling (10) and is connected with it also is equipped with and the intermeshing worm gear of worm screw (11) (12); Servomotor (8) is fixed on the adjusting arm housing (13) by joint bolt, bearing cap shim (9) is placed between the conjunction plane of servomotor (8) and adjusting arm housing (13), is used to adjust the endplay between servomotor (8) axle drive shaft and fast coupling (10), worm screw (11) and the adjusting arm housing (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101546021A CN101704364B (en) | 2009-11-19 | 2009-11-19 | Real-time monitoring and automatic regulating system of automotive brake clearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101546021A CN101704364B (en) | 2009-11-19 | 2009-11-19 | Real-time monitoring and automatic regulating system of automotive brake clearance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101704364A CN101704364A (en) | 2010-05-12 |
| CN101704364B true CN101704364B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101546021A Expired - Fee Related CN101704364B (en) | 2009-11-19 | 2009-11-19 | Real-time monitoring and automatic regulating system of automotive brake clearance |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907143B (en) * | 2010-07-23 | 2012-06-06 | 浙江大学 | Program-controlled car brake gap automatic slack adjuster |
| CN109302042B (en) * | 2018-09-10 | 2020-02-14 | 中车青岛四方机车车辆股份有限公司 | Device for actively adjusting eddy current brake magnet gap and control method thereof |
| CN112833006B (en) * | 2021-02-05 | 2022-07-01 | 郑州大学 | Intelligent gear pump with adjustable end face clearance |
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