CN203460857U - Driving braking force adjusting system with failure backup function for motor driving hydraulic cavity - Google Patents
Driving braking force adjusting system with failure backup function for motor driving hydraulic cavity Download PDFInfo
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- CN203460857U CN203460857U CN201320581194.XU CN201320581194U CN203460857U CN 203460857 U CN203460857 U CN 203460857U CN 201320581194 U CN201320581194 U CN 201320581194U CN 203460857 U CN203460857 U CN 203460857U
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Abstract
The utility model belongs to the technical field of automobile braking, particularly relates to a driving braking force adjusting system with a failure backup function for a motor driving hydraulic cavity, and aims to provide a multifunctional system which is compact in structure, convenient to arrange, and simple in failure backup. The driving braking force adjusting system comprises a brake housing (27), a motor (2), a hydraulic power source, electromagnetic valves and brake cylinders (28), and is characterized by further comprising a brake pedal simulator and a movement switching mechanism. The driving braking force adjusting system has the advantages that a vacuum booster is eliminated, so as to effectively reduce the whole mass, and be compact in structure and easy to arrange; as the motor is adopted to serve as a power source, and the movement switching mechanism comprising a ball screw pair and a hydraulic cavity piston is adopted, wherein the ball screw pair comprises an external nut integrated with the rotor of the motor and the hydraulic cavity, that is, mechanical and electrical connection is adopted, the braking response is fast; as the brake pedal simulator is adopted to be matched with a piston push rod and a piston fixing rod, the braking backup function of a braking mechanical structure is realized, and driving safety is guaranteed.
Description
Technical field
The utility model belongs to automobile brake technical field, is specifically related to the initiative brake control system that a kind of motor driven liquid with the backup of losing efficacy is pressed chamber.
Background technology
On modern automobile, widely used hydraulic brake system comprises brake pedal, vacuum booster, and master brake cylinder, hydraulic tubing, brake wheel cylinder, several parts such as electromagnetic valve form, although traditional braking system has become a very proven technique.But also there are some problems in this system: such as mechanical part is more, hydraulic tubing is complicated, and vacuum booster volume ratio is larger, and especially, after integrated electric control function, system is more complicated, arranges that assembly difficulty is large.For traditional braking system, in the reply problem that the environment of complexity faces instantly, many researchists explore the development of following brake system, try hard to break through the deficiency on conventional confguration.
Along with scientific and technological progress, line control brake system is more and more subject to people's favor.As mechanical type brake system electric (EMB) adopts motor as brake actuator, cancelled traditional hydraulic braking pipeline, there is response fast, feature simple in structure.EHB (EHB) is to provide high pressure to pressurize by energy storage, and high-speed switch electromagnetic valve is controlled pressure of wheel braking cylinder, has retained hydraulic tubing, has response fast, the feature that reliability is high.But EMB is owing to having adopted a large amount of electronicies package in system, and therefore the backup when braking failure is too complicated, high cost; EHB is because it directly controls pressure of wheel braking cylinder, and the electromagnetic valve quantity of application is too much, and hydraulic tubing is too cumbersome, makes system too numerous and jumbled.
Summary of the invention
The purpose of this utility model is to provide a kind of compact conformation, arrangement convenience, inefficacy backup is simple and have the initiative brake control system that the multi-functional motor driven liquid with the backup of losing efficacy is pressed chamber.
The utility model is achieved in that
The motor driven liquid with the backup of losing efficacy is pressed the initiative brake control system in chamber, comprises brake shell body, motor, hydraulic power source, electromagnetic valve and wheel cylinder, it also comprise brake pedal simulator and movement conversion mechanism; Wherein, brake shell body is cylindric, is connected with brake pedal simulator; Motor is connected with movement conversion mechanism with electronic control unit respectively; Brake pedal simulator is arranged on movement conversion mechanism front end; Hydraulic power source is connected with movement conversion mechanism; Totally four of brake wheel cylinders, are connected with movement conversion mechanism by electromagnetic valve respectively.
Brake pedal simulator as above comprises brake pedal, pedal push rod, simulator end face, sleeve, simulator stub axle, simulator housing, damping element, pedal displacement sensor and pedal simulator damping spring; Brake pedal is connected with the front end of pedal push rod; Simulator end face is discoid, and center has through hole, is fixedly connected with the front end of sleeve; Sleeve is cylindric, and front end end face has taper hole, and middle part outside is provided with snap ring, and the front end of snap ring withstands in the front inner wall with simulator housing, has blind hole as simulator stub axle mounting hole at the middle part of back segment; The rear end of pedal push rod is connected with the front end of sleeve through the through hole at simulator end face middle part; Simulator housing is the cylindric of both ends open, and the size of rear and front end opening is consistent with the external diameter of sleeve and the external diameter of simulator stub shaft rear end respectively, and rear end has tapped bore as lockup piston left end stock mounting hole; Simulator stub axle is cylinder, front portion is arranged in the through hole at sleeve middle part, rear end external diameter is compared with the little 3～5mm of simulator stub axle base portion external diameter, rear end is arranged in the opening that simulator housing is rear end, in the center of simulator stub shaft rear end end face, has circular groove as damping element mounting hole; Pedal simulator damping spring is sleeved on outside sleeve and simulator stub axle, and front end withstands on the rear end end face of sleeve snap ring, and it is on the inwall of rear end that rear end withstands on simulator housing; The pedal displacement sensor of brake pedal simulator is connected with the lever of brake pedal by support, and to be fixedly mounted on simulator housing be on bottom end face; Damping element is arranged in the damping element mounting hole of simulator stub shaft rear end, corresponding with piston push rod installation site.
Movement conversion mechanism as above comprises ball spiral pair and hydraulic cavities piston, and hydraulic cavities piston is arranged on ball spiral pair inside; Wherein, ball spiral pair comprises hydraulic cavities and outer nut; Wherein, hydraulic cavities is ball screw hollow structure, the cavity volume of processing diameter 20mm, a length 50mm in screw rod, and cavity volume inner structure is consistent with traditional plunger-type brake master cylinder cavity volume, comprises ante-chamber and back cavity; Outside, hydraulic cavities middle part has plug helix as outer nut mounting groove; In the both sides up and down of hydraulic cavities afterbody, have two grooves and make pre-tightening mechanism mounting hole; Outer nut is sleeved in the outer nut mounting groove of hydraulic cavities, coordinates and realizes ball spiral pair with hydraulic cavities.
Motor as above is hollow structure, is sleeved on outer nut outside, and rotor and outer nut become one.
Hydraulic cavities piston as above is universal piston structure, be arranged in hydraulic cavities, and with the inner Matching installation of hydraulic cavities, its one end is connected with piston fixed link by attachment pegs.
Hydraulic cavities piston as above comprises ante-chamber piston and back cavity piston; Ante-chamber piston and back cavity piston are two independently hydraulic cavities by hydraulic cavities interior separation; The front end of back cavity piston spring withstands on the inwall of back cavity piston closes one end, and rear end withstands on the inwall of hydraulic cavities rear end; The outer face middle part, one end of ante-chamber piston closes has groove as piston fixed link mounting hole, and the front end of ante-chamber piston is connected with the rear end of piston fixed link and the rear end of piston push rod respectively; Ante-chamber piston spring front end withstands on the inwall of ante-chamber piston closes one end, and the rear end of ante-chamber piston spring withstands on the end face of back cavity piston closes one end.
It also comprises piston fixed link and piston push rod, piston fixed link is the metallic cylinder of hollow, adopt No. 45 traditional steel to make, leading portion outside at it has annular groove, its rear end is arranged in the piston fixed link mounting hole of one end of hydraulic cavities ante-chamber piston closes, its leading portion is connected with brake shell body, and by brake casing, limit it and move, and then the movement of restriction hydraulic cavities piston; Piston push rod is that metal-made is shaft-like, and rear end embeds in piston fixed link, withstands on one end outer face of ante-chamber piston closes.
Hydraulic power source as above adopts hydraulic accumulator to realize; Described electromagnetic valve comprises lockup piston chamber electromagnetic valve, brake wheel cylinder electromagnetic valve and hydraulic accumulator electromagnetic valve, and wherein, brake wheel cylinder electromagnetic valve has 4, and hydraulic accumulator electromagnetic valve has 2; The liquid outlet of hydraulic accumulator is connected with the input end of hydraulic cavities ante-chamber, hydraulic cavities back cavity, 4 brake wheel cylinder electromagnetic valves, the input end of lockup piston chamber electromagnetic valve by hydraulic accumulator electromagnetic valve respectively; The mouth of brake wheel cylinder electromagnetic valve is connected with the inlet of 4 brake wheel cylinders 8 respectively; The mouth of lockup piston chamber electromagnetic valve is connected with the inlet in lockup piston chamber.
Brake shell body as above is cylindric, has two through holes on its rear end end face, and its leading portion is connected with simulator end face by bellows, protection brake pedal simulator; Rear end core embeds in the groove in piston fixed link outside.
It also comprises lockup piston chamber; Totally 2, described lockup piston chamber, they are connected with brake shell body with simulator housing respectively, and their front end is connected with simulator housing respectively, and two through holes of brake shell body rear end are passed respectively at middle part; Lockup piston chamber comprises lockup piston housing, lockup piston and damping spring; Lockup piston housing is cylindric for sealing, and front end bottom has lockup piston chamber fluid hole, by lockup piston chamber fluid hole, is connected with the mouth of lockup piston chamber electromagnetic valve, and intracavity liquid is connected with brake circuit; Lockup piston left end is stock, and the large end of piston is rubber piston, and lockup piston left end stock is arranged in the lockup piston left end stock mounting hole on simulator housing by screw thread; Damping spring is contained in lockup piston right-hand member.
The beneficial effects of the utility model are:
The utility model has been cancelled vacuum booster, and the mechanical connection between brake pedal and hydraulic cavities is cancelled, and effectively reduces total quality, and compact conformation is easy to arrange.Reduce to a great extent structural complexity, reduced cost.By adopting motor as propulsion source, adopt by the ball spiral pair forming with the integrated outer nut of rotor and hydraulic cavities 4, and the movement conversion mechanism that forms of hydraulic cavities piston 5, adopt machinery and be electrically connected, signal transmission is rapid, and braking response is fast.By controlling electromagnetic valve and motor, realized difference braking.By adopting brake pedal simulator, fitting piston push rod 22 and piston fixed link 23, realized the braking backup of braking physical construction, when electrical structure lost efficacy, backup architecture can be got involved very soon, produce certain brake action, ensured driving safety, meet brake legislation demand.
Accompanying drawing explanation
Fig. 1 is the principle schematic that a kind of motor driven liquid with the backup of losing efficacy of the present utility model is pressed the initiative brake control system in chamber;
Fig. 2 is brake system drive part schematic diagram in Fig. 1;
Fig. 3 is lockup piston cavity configuration schematic diagram in Fig. 1;
Fig. 4 is the structural representation of pre-tightening mechanism in Fig. 1;
In figure, 1. brake pedal, 2. motor, 3. outer nut, 4. hydraulic cavities, 5. hydraulic cavities piston, 6. lockup piston chamber electromagnetic valve, 7. brake wheel cylinder electromagnetic valve, 8. hydraulic accumulator electromagnetic valve, 9. hydraulic accumulator, 10. pressure sensor, 11. deep groove ball bearings, 12. rotary angle transmitters, 13. pretension vertical connecting rods, 14. pretension tranverse connecting rods, 15. lockup piston, 16. damping springs, 17. pedal displacement sensors, 18. attachment pegs, 19. preloading springs, 20. plunger shaft fluid holes, 21. lockup piston housings, 22. piston push rods, 23. piston fixed links, 24. damping elements, 25. pedal simulator damping springs, 26. simulator housings, 27. brake shell bodies, 28. brake wheel cylinders, 29. pedal push rods, 30. sleeves, 31. simulator stub axles, 32. simulator end faces, 33. dust boots.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, to a kind of motor driven liquid with the backup of losing efficacy of the present utility model, press the initiative brake control system in chamber to be introduced:
As shown in Figure 1, a kind of motor driven liquid with the backup of losing efficacy is pressed the initiative brake control system in chamber, comprises brake shell body 27, motor 2, brake pedal simulator, movement conversion mechanism, hydraulic power source, electromagnetic valve and brake wheel cylinder 28.Wherein, brake shell body 27 is cylindric, and it is connected with brake pedal simulator.Motor 2 is connected with movement conversion mechanism with electronic control unit respectively, rotates, for movement conversion mechanism provides power under the control of electronic control unit.Movement conversion mechanism is converted into straight-line motion by rotatablely moving of motor 2.Brake pedal simulator is arranged on movement conversion mechanism front end, and the braking intention for simulating brake sensation and acquisition chaufeur, when motor 2 lost efficacy, realizes wheel braking.Hydraulic power source is connected with movement conversion mechanism, for compensating hydraulic pressure, reveals.Totally four of brake wheel cylinders 28, four brake wheel cylinders 28 are connected with movement conversion mechanism by electromagnetic valve respectively, under the control of electronic control unit, realize braking power is provided for wheel.
In the present embodiment, brake pedal simulator comprises brake pedal 1, pedal push rod 29, simulator end face 32, sleeve 30, simulator stub axle 31, simulator housing 26, damping element 24, pedal displacement sensor 17 and pedal simulator damping spring 25.Brake pedal 1 is bolted with the front end of pedal push rod 29, at chaufeur, tramples lower drive pedal push rod 29 motions.Simulator end face 32 is discoid, and its center has through hole, and it is fixedly connected with the front end of sleeve 30.Sleeve 30 is cylindric, front end end face at it has taper hole, outside, middle part is provided with snap ring, the front end of snap ring withstands in the front inner wall with simulator housing 26, at the middle part of back segment, have blind hole as simulator stub axle 31 mounting holes, the size of this blind hole is consistent with the external diameter of simulator stub axle 31.The rear end of pedal push rod 29 is connected by ball pivot with the front end of sleeve 30 through the through hole at simulator end face 32 middle parts.What simulator housing 26 was both ends open is cylindric, and the size of rear and front end opening is consistent with the external diameter of sleeve 30 and the external diameter of simulator stub axle 31 rear ends respectively, has tapped bore as lockup piston left end stock mounting hole in its rear end.Simulator stub axle 31 is cylinder, its front portion is arranged in the through hole at sleeve 30 middle parts, rear end external diameter is compared with the little 3～5mm of simulator stub axle 31 base portion external diameter, as 3mm, 4mm or 5mm, rear end is arranged in the opening that simulator housing 26 is rear end, in the center of simulator stub axle 31 rear end end faces, has circular groove as damping element mounting hole.Pedal simulator damping spring 25 is sleeved on outside sleeve 30 and simulator stub axle 31, front end withstands on the rear end end face of sleeve 30 snap rings, rear end withstands on simulator housing 26 on the inwall of rear end, and it is braked and provide antagonistic force to simulate the brake feel of traditional vehicle for chaufeur.The pedal displacement sensor 17 of brake pedal simulator is connected with the lever of brake pedal 1 by support, and is fixedly mounted on simulator housing 26 on bottom end face.When chaufeur is stepped on brake pedal 1,17 of pedal displacement sensors can collect pedal displacement signal, and this signal is sent to electronic control unit.Damping element 24 is arranged in the damping element mounting hole of simulator stub axle 31 rear ends, corresponding with piston push rod 22 installation sites, once motor 2 lost efficacy, brake pedal simulator can move and promote piston push rod 22 generation braking forces.Brake pedal 1 and pedal push rod 29 are matured product, are commercially available.Simulator end face 32, sleeve 30, simulator stub axle 31, simulator housing 26 are for all adopting No. 45 steel to make.Pedal simulator damping spring 25, pedal displacement sensor 17 are the universal product, are commercially available.Damping element 24 is Rubber Parts.
As shown in Figure 2, movement conversion mechanism comprises ball spiral pair and hydraulic cavities piston 5, and hydraulic cavities piston 5 is arranged on ball spiral pair inside.
Ball spiral pair comprises hydraulic cavities 4 and outer nut 3.Hydraulic cavities 4 is ball screw hollow structure, the cavity volume of processing diameter 20mm, a length 50mm in screw rod, cavity volume inner structure is consistent with traditional plunger-type brake master cylinder cavity volume, comprises ante-chamber and back cavity, and hydraulic cavities 4 outsides, middle part have plug helix as outer nut mounting groove; In the both sides up and down of hydraulic cavities 4 afterbodys, have two grooves and make pre-tightening mechanism mounting hole.Outer nut 3 is sleeved in the outer nut mounting groove of hydraulic cavities 4, coordinates and realizes ball spiral pair with hydraulic cavities 4.Motor 2 is hollow structure, is sleeved on outer nut 3 outsides, and motor 2 rotors and outer nut 3 become one, and the moment of torsion of motor 2 and dynamic response mate the demand of whole brake system.In the present embodiment, the stall moment of torsion of motor 2 is 4NM, and motor 2 locked rotor currents can not be too large, and response time is short, and in 4ms, racing speed can reach 2000rpm, and rotating is short switching time, and the unitary rotation inertia of motor 2 is 10
-5the order of magnitude; Motor 2 drives outer nut 3 rotations while rotating, be converted into the traveling priority of hydraulic cavities 4 by ball and plug helix.Deep groove ball bearing 11 is sleeved on the two ends in outer nut 3 outsides, for limiting the axial motion of outer nut 3.Rotary angle transmitter 12 is arranged on motor 2 rotor places, its mouth is connected with electronic control unit, the angular transposition rotating for detection of outer nut 3 and the position of hydraulic cavities 4, obtain thus the relative displacement of piston and hydraulic cavities, and the angular displacement signal that detection is obtained sends to electronic control unit.In the present embodiment, outer nut 3, hydraulic cavities 4 and deep groove ball bearing 11 all adopt bearing steel to make, as adopted GCr15 to make.
The metallic cylinder that piston fixed link 23 is hollow, adopt No. 45 traditional steel to make, leading portion outside at it has annular groove, its rear end is arranged in the piston fixed link mounting hole of one end of hydraulic cavities piston 5 ante-chamber piston closes, its leading portion is connected with brake shell body 27, by brake casing, limit it and move, and then limited the movement of piston 5.Piston push rod 22 is shaft-like, and its rear end embeds in piston fixed link 23, withstands on one end outer face of ante-chamber piston closes.In the present embodiment, piston push rod 22 is made of metal, as made by 7075 aluminium.While promoting piston push rod 22, can make hydraulic cavities piston 5 and piston fixed link 23 depart from, hydraulic cavities piston 5 can move axially.
As shown in Figure 3, totally 2 of pre-tightening mechanisms, they are arranged on respectively in the pre-tightening mechanism groove of hydraulic cavities both sides Shang Xia 4, and it comprises pretension tranverse connecting rod 14, preloading spring 19 and pretension vertical connecting rod 13.Pretension vertical connecting rod 13 is shaft-like, and its top has cylindrical hole as pretension tranverse connecting rod 14 mounting holes, and its bottom straight cutting enters in the pre-tightening mechanism groove of hydraulic cavities 4.Pretension tranverse connecting rod 14 is shaft-like, its one end through pretension tranverse connecting rod 14 mounting holes of pretension vertical connecting rod 13, be arranged on brake shell body 27.Preloading spring 19 is sleeved on tight tranverse connecting rod 14 outsides, is stuck between brake shell body 27 and pretension tranverse connecting rod 14, and preloading spring 19 keeps certain amount of compression, makes hydraulic cavities 4 ball spiral pair pretensions.Pretension vertical connecting rod and pretension tranverse connecting rod can adopt No. 45 steel to make. preloading spring is gauge member, is commercially available.
Hydraulic power source adopts hydraulic accumulator 9 to realize.Electromagnetic valve comprises lockup piston chamber electromagnetic valve 6, brake wheel cylinder electromagnetic valve 7 and hydraulic accumulator electromagnetic valve 8, and wherein, brake wheel cylinder electromagnetic valve 7 has 4, and hydraulic accumulator electromagnetic valve 8 has 2, and hydraulic accumulator electromagnetic valve 8 is normally closed valve.The liquid outlet of hydraulic accumulator 9 is connected with the input end of hydraulic cavities 4 ante-chambers, hydraulic cavities 4 back cavities, 4 brake wheel cylinder electromagnetic valves 7, the input end of lockup piston chamber electromagnetic valve 6 by hydraulic accumulator electromagnetic valve 8 respectively.The mouth of brake wheel cylinder electromagnetic valve 7 is connected with the inlet of 4 brake wheel cylinders 28 respectively.The mouth of lockup piston chamber electromagnetic valve 6 is connected with the inlet in lockup piston chamber.Connection between above-mentioned hydraulic accumulator 9, electromagnetic valve, hydraulic cavities 4 and lockup piston chamber all realizes by hydraulic tubing.
The control end of above-mentioned electromagnetic valve is all connected with electronic control unit, under the control of its control signal, moves.Pressure sensor 10 is arranged on the pipeline of hydraulic accumulator electromagnetic valve 8 and hydraulic cavities 4 ante-chambers, adopts the universal product.
By controlling the switch of the electromagnetic valve 8 of energy storage, can make hydraulic accumulator 9 optionally connect with hydraulic tubing, pressure line is directly being communicated with two epitrochoidal chambers of hydraulic cavities 4, by controlling liquid turnover hydraulic accumulator 9, realize the size of pedal simulator 23 and piston push rod 22 idle travels, when braking liquid enters hydraulic accumulator 9, idle travel will increase, and when braking liquid oppositely flows out, idle travel will diminish.Equally, by controlling respectively 4 brake wheel cylinder electromagnetic valves 7, can realize hydraulic accumulator 9 compensation brakings liquid and reveal loss, and then adjust the effect of car side brake brake clearance.
In concrete control implementation, by pressure sensor 10, obtained the pressure of hydraulic cavities 4 and hydraulic tubing, by rotary angle transmitter 12, calculate hydraulic cavities 4 displacements, can be P-V characteristic estimation pressure of wheel braking cylinder value according to the relation of the fluid pressure of the action of brake wheel cylinder electromagnetic valve 7 and wheel cylinder and volume, realize accurate control and the adjusting of pressure.
In the utility model, attachment pegs 18 used is tapered pin, adopts No. 45 steel to make.Hydraulic cavities piston 5 ante-chamber pistons are connected with piston fixed link 23 by attachment pegs 18, and ante-chamber piston cannot be moved axially, and when applying certain effect power on piston push rod 22, piston 5 can move together with push rod 22.Hydraulic cavities piston 5 is connected and fixed by attachment pegs 18 and piston fixed link 23, and piston fixed link 23 is fixing by brake shell body 27, while having realized conventional brake, piston is fixed, hydraulic cavities 4 feed motions, and while losing efficacy, also can directly produce brake action by piston push rod 22.
As shown in Figure 4, totally 2, lockup piston chamber, they are connected with brake shell body 27 with simulator housing 26 respectively, and their front end is connected with simulator housing 26 respectively, and two through holes of brake shell body 27 rear ends are passed respectively at middle part.Lockup piston chamber comprises lockup piston housing 21, lockup piston 15 and damping spring 16.Lockup piston housing 21 is cylindric for sealing, has lockup piston chamber fluid hole 20 in its front end bottom, by lockup piston chamber fluid hole 20, is connected with the mouth of lockup piston chamber electromagnetic valve 6, and intracavity liquid is connected with brake circuit.Lockup piston 15 left ends are stock, and the large end of piston is rubber piston, and lockup piston left end stock is arranged in the lockup piston left end stock mounting hole on simulator housing 26 by screw thread.Damping spring 16 is contained in lockup piston 15 right-hand members, plays guiding and shock damping action, and spring stiffness K is less than 5000N/m.When lockup piston chamber fluid hole 20 lockup piston chamber, place electromagnetic valves 6, close, lockup piston 15 inner sealings have liquid, and lockup piston 15 cannot move, and simulator housing 26 also cannot traveling priority.When lockup piston chamber electromagnetic valve 6 is opened, lockup piston 15 can promote liquid in hydraulic circuit, and lockup piston 15 can traveling priority.Same simulator housing 26 is also movable, spacing releasing.Lockup piston housing 21 is ironcasting, and lockup piston 15 is by adopting composite material to make, as Bi-metal Steel Aluminum.
Brake wheel cylinder adopts spheroidal graphite iron to make.
Electromagnetic valve in native system all adopts high-speed switch valve, for matured product on the market, pressure sensor 10 is also continued to use the scheme of traditional braking system, rotary angle transmitter 12 and pedal displacement sensor 17 are all selected existing product, the version of pedal simulator is also existing technology, and implementation must be checking.Electronic control unit is matured product, and it can adopt existing techniques in realizing to the control of motor 2, electromagnetic valve, brake wheel cylinder 28.
Below the working process of native system is introduced:
Automobile is when normally travelling, when chaufeur is stepped on brake pedal 1, electronic control unit stroke sensor 17 analyzes driver intention, drive motor 2 rotations, by ball spiral pair, make hydraulic cavities 4 straight-line motions, hydraulic cavities piston 5 is fixing by piston fixed link 23 and attachment pegs 18, the interior generation brake-pressure of hydraulic cavities 4, open brake wheel cylinder electromagnetic valve 7, braking liquid enters brake wheel cylinder 28 and produces lock torque.If need pressurize, brake wheel cylinder electromagnetic valve 7 is closed, brake wheel cylinder 28 pressurizes.If while needing decompression, motor 2 reversions, hydraulic cavities 4 oppositely moves, and same brake wheel cylinder electromagnetic valve 7 is opened, and braking liquid is back in hydraulic cavities 4 from brake wheel cylinder 28.
When each brake wheel cylinder 28 pressure of brake request there are differences, electronic control unit can be opened separately such as the brake wheel cylinder electromagnetic valve 7 of controlling the near front wheel, closes other 3 brake wheel cylinder electromagnetic valves 7, and the near front wheel is carried out to braking pressure control.After this process finishes, close the brake wheel cylinder electromagnetic valve 7 of the near front wheel, carry out pressure adjusting to one in 3 remaining brake wheel cylinders 28, make according to this 4 pressure of wheel braking cylinder in certain control cycle, reach the brake-pressure of expectation, in control, according to priority, adopt sequential system flowing mode.
When power source motor 2 et out of order, for the electromagnetic valve 6 in lockup piston chamber, open, under normal circumstances, electromagnetic valve 6 is closed, and makes in the axial direction pedal simulator unit 22 fixing, people can not produced when stepping on brake pedal loosening.Electromagnetic valve 6 is opened, lockup piston chamber is communicated with hydraulic cavities 4 by hydraulic tubing, now when people steps on brake pedal 1 again, pedal stroke simulator 23 will move axially, after the idle travel overcoming with piston push rod 22, can promote hydraulic cavities piston 5 together with piston push rod 22 and produce brake-pressure, this system has braking backup units.
The braking anti-lock stage, on the basis of conventional brake, if off front wheel enters slip state, electronic control unit reduces pressure to right brake wheel cylinder 28, the brake wheel cylinder electromagnetic valve 7 that is 4 of right brake wheel cylinder 28 and hydraulic cavities is opened, motor 2 reversions drive hydraulic cavities 4 oppositely to move, hydraulic cavities 4 pressure drops, now right front brake wheel cylinder 28 pressure are greater than hydraulic cavities 4 inside brake hydraulic couplings, off front wheel decompression, and other San road brake wheel cylinder electromagnetic valves 7 are closed, in packing state, if exist many wheels to enter slip state, electronic control unit is controlled each brake wheel cylinder 28 pressure successively by control logic, certain pressure of taking turns brake wheel cylinder 28 regulates, also can in regulating circulation, several times complete by electronic control unit, its principle and single-wheel increase, subtract, the principle of pressurize is consistent.
In the situation that electronic stability is controlled, after vehicle unstability, electronic control unit is by analyzing each sensor and brake wheel cylinder 28 pressure, status information in conjunction with vehicle, calculate each target brake wheel cylinder 28 and need the pressure regulating, then to brake wheel cylinder 28 increase, subtract, pressure maintaining period, its principle is wheel anti-lock situation during with braking, makes brake wheel cylinder 28 pressure reach anticipated value.
Deboost phase initiatively, the signal gathering by sensor, is distributed the pressure of each brake wheel cylinder 28 by electronic control unit, and this system also can be carried out active boost to each brake wheel cylinder 28, and its process as previously mentioned.
Of the present utility modelly with respect to traditional brake system, cancelled vacuum booster, eliminated the dependence to driving engine degree of vacuum, adopt motor 2 as propulsion source, employing is by the ball spiral pair forming with the integrated outer nut of rotor and hydraulic cavities 4, and the movement conversion mechanism that forms of hydraulic cavities piston 5, realized the adjustability of assist rate, reduced the volume of brake system, arrange convenient flexibly, compact conformation.Adopt machinery and electrical connection, signal transmission is rapid, and braking response is fast.
This brake system has realized the decoupling zero of pedal stroke and piston stroke, and pedal simulator is simulated and resolved chaufeur braking intention, is more applicable for hybrid vehicle and electronlmobil, the function that compatible energy reclaims.In the course of the work, because active decompression can produce compression shock to brake system, fluctuation of pressure can be delivered to chaufeur to tradition ABS, causes pedal " to pinch ", even and this system ABS, ESP does the used time, also can not produce any impact to chaufeur sensation.
By adopting brake pedal simulator, fitting piston push rod 22 and piston fixed link 23, realized the braking backup of braking physical construction, when electrical structure lost efficacy, backup architecture can be got involved very soon, produce certain brake action, ensured driving safety, meet brake legislation demand.
Claims (10)
1. the motor driven liquid with the backup of losing efficacy is pressed the initiative brake control system in chamber, comprises brake shell body (27), motor (2), hydraulic power source, electromagnetic valve and brake wheel cylinder (28); It is characterized in that: it also comprises brake pedal simulator and movement conversion mechanism; Wherein, described brake shell body (27) is cylindric, is connected with brake pedal simulator; Motor (2) is connected with movement conversion mechanism with electronic control unit respectively; Brake pedal simulator is arranged on movement conversion mechanism front end; Hydraulic power source is connected with movement conversion mechanism; Totally four of brake wheel cylinders (28), are connected with movement conversion mechanism by electromagnetic valve respectively.
2. a kind of motor driven liquid with the backup of losing efficacy according to claim 1 is pressed the initiative brake control system in chamber, it is characterized in that: described brake pedal simulator comprises brake pedal (1), pedal push rod (29), simulator end face (32), sleeve (30), simulator stub axle (31), simulator housing (26), damping element (24), pedal displacement sensor (17) and pedal simulator damping spring (25); Brake pedal (1) is connected with the front end of pedal push rod (29); Simulator end face (32) is discoid, and center has through hole, is fixedly connected with the front end of sleeve (30); Sleeve (30) is cylindric, and front end end face has taper hole, and middle part outside is provided with snap ring, and the front end of snap ring withstands in the front inner wall with simulator housing (26), has blind hole as simulator stub axle (31) mounting hole at the middle part of back segment; The rear end of pedal push rod (29) is connected with the front end of sleeve (30) through the through hole at simulator end face (32) middle part; What simulator housing (26) was both ends open is cylindric, and the size of rear and front end opening is consistent with the external diameter of sleeve (30) and the external diameter of simulator stub axle (31) rear end respectively, and rear end has tapped bore as lockup piston left end stock mounting hole; Simulator stub axle (31) is cylinder, front portion is arranged in the through hole at sleeve (30) middle part, rear end external diameter is compared with the little 3～5mm of simulator stub axle (31) base portion external diameter, rear end is arranged in the opening that simulator housing (26) is rear end, has circular groove as damping element mounting hole in the center of simulator stub axle (31) rear end end face; Pedal simulator damping spring (25) is sleeved on outside sleeve (30) and simulator stub axle (31), and front end withstands on the rear end end face of sleeve (30) snap ring, and rear end withstands on simulator housing (26) on the inwall of rear end; The pedal displacement sensor (17) of brake pedal simulator is connected with the lever of brake pedal (1) by support, and is fixedly mounted on simulator housing (26) on bottom end face; Damping element (24) is arranged in the damping element mounting hole of simulator stub axle (31) rear end, corresponding with piston push rod (22) installation site.
3. a kind of motor driven liquid with the backup of losing efficacy according to claim 1 and 2 is pressed the initiative brake control system in chamber, it is characterized in that: described movement conversion mechanism comprises ball spiral pair and hydraulic cavities piston (5), and hydraulic cavities piston (5) is arranged on ball spiral pair inside; Wherein, ball spiral pair comprises hydraulic cavities (4) and outer nut (3); Wherein, hydraulic cavities (4) is ball screw hollow structure, the cavity volume of processing diameter 20mm, a length 50mm in screw rod, and cavity volume inner structure is consistent with traditional plunger-type brake master cylinder cavity volume, comprises ante-chamber and back cavity; Outside, hydraulic cavities (4) middle part has plug helix as outer nut mounting groove; In the both sides up and down of hydraulic cavities (4) afterbody, have two grooves and make pre-tightening mechanism mounting hole; Outer nut (3) is sleeved in the outer nut mounting groove of hydraulic cavities (4), coordinates and realizes ball spiral pair with hydraulic cavities (4).
4. a kind of motor driven liquid with the backup of losing efficacy according to claim 3 is pressed the initiative brake control system in chamber, it is characterized in that: described motor (2) is hollow structure, be sleeved on outer nut (3) outside, rotor and outer nut (3) become one.
5. a kind of motor driven liquid with the backup of losing efficacy according to claim 4 is pressed the initiative brake control system in chamber, it is characterized in that: described hydraulic cavities piston (5) is universal piston structure, be arranged in hydraulic cavities (4), and with the inner Matching installation of hydraulic cavities (4), its one end is connected with piston fixed link (23) by attachment pegs 18.
6. a kind of motor driven liquid with the backup of losing efficacy according to claim 5 is pressed the initiative brake control system in chamber, it is characterized in that: described hydraulic cavities piston (5) comprises ante-chamber piston and back cavity piston; Ante-chamber piston and back cavity piston are two independently hydraulic cavities by hydraulic cavities (4) interior separation; The front end of back cavity piston spring withstands on the inwall of back cavity piston closes one end, and rear end withstands on the inwall of hydraulic cavities (4) rear end; The outer face middle part, one end of ante-chamber piston closes has groove as piston fixed link (23) mounting hole, and the front end of ante-chamber piston is connected with the rear end of piston fixed link (23) and the rear end of piston push rod respectively; Ante-chamber piston spring front end withstands on the inwall of ante-chamber piston closes one end, and the rear end of ante-chamber piston spring withstands on the end face of back cavity piston closes one end.
7. a kind of motor driven liquid with the backup of losing efficacy according to claim 6 is pressed the initiative brake control system in chamber, it is characterized in that: it also comprises piston fixed link (23) and piston push rod (22), the metallic cylinder that piston fixed link (23) is hollow, adopt No. 45 traditional steel to make, leading portion outside at it has annular groove, its rear end is arranged in piston fixed link (23) mounting hole of one end of hydraulic cavities (4) ante-chamber piston closes, its leading portion is connected with brake shell body (27), by brake casing, limiting it moves, and then the movement of restriction hydraulic cavities piston (5), piston push rod (22) is that metal-made is shaft-like, and rear end embeds in piston fixed link (23), withstands on one end outer face of ante-chamber piston closes.
8. a kind of motor driven liquid with the backup of losing efficacy according to claim 1 is pressed the initiative brake control system in chamber, it is characterized in that: described hydraulic power source adopts hydraulic accumulator (9) to realize; Described electromagnetic valve comprises lockup piston chamber electromagnetic valve (6), brake wheel cylinder electromagnetic valve (7) and hydraulic accumulator electromagnetic valve (8), and wherein, brake wheel cylinder electromagnetic valve (7) has 4, and hydraulic accumulator electromagnetic valve (8) has 2; The liquid outlet of hydraulic accumulator (9) is connected with hydraulic cavities (4) ante-chamber, hydraulic cavities (4) back cavity, the input end of 4 brake wheel cylinder electromagnetic valves (7), the input end of lockup piston chamber electromagnetic valve (6) by hydraulic accumulator electromagnetic valve (8) respectively; The mouth of brake wheel cylinder electromagnetic valve (7) is connected with the inlet of 4 brake wheel cylinders (28) respectively; The mouth of lockup piston chamber electromagnetic valve (6) is connected with the inlet in lockup piston chamber.
9. a kind of motor driven liquid with the backup of losing efficacy according to claim 1 is pressed the initiative brake control system in chamber, it is characterized in that: described brake shell body (27) is for cylindric, on its rear end end face, have two through holes, its leading portion is connected with simulator end face (32) by bellows (33), protection brake pedal simulator; Rear end core embeds in the groove in piston fixed link (23) outside.
10. a kind of motor driven liquid with the backup of losing efficacy according to claim 1 is pressed the initiative brake control system in chamber, it is characterized in that: it also comprises lockup piston chamber; Totally 2, described lockup piston chamber, they are connected with brake shell body (27) with simulator housing (26) respectively, their front end is connected with simulator housing (26) respectively, and two through holes of brake shell body (27) rear end are passed respectively at middle part; Lockup piston chamber comprises lockup piston housing (21), lockup piston (15) and damping spring (16); Lockup piston housing (21) is cylindric for sealing, and front end bottom has lockup piston chamber fluid hole, by lockup piston chamber fluid hole (20), is connected with the mouth of lockup piston chamber electromagnetic valve, and intracavity liquid is connected with brake circuit; Lockup piston (15) left end is stock, and the large end of piston is rubber piston, and lockup piston (15) left end stock is arranged in the lockup piston left end stock mounting hole on simulator housing (26) by screw thread; Damping spring (16) is contained in lockup piston (15) right-hand member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320581194.XU CN203460857U (en) | 2013-09-20 | 2013-09-20 | Driving braking force adjusting system with failure backup function for motor driving hydraulic cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320581194.XU CN203460857U (en) | 2013-09-20 | 2013-09-20 | Driving braking force adjusting system with failure backup function for motor driving hydraulic cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203460857U true CN203460857U (en) | 2014-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320581194.XU Withdrawn - After Issue CN203460857U (en) | 2013-09-20 | 2013-09-20 | Driving braking force adjusting system with failure backup function for motor driving hydraulic cavity |
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| Country | Link |
|---|---|
| CN (1) | CN203460857U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103950444A (en) * | 2014-04-14 | 2014-07-30 | 同济大学 | Electronic hydraulic brake system capable of reducing liquid outlets of main cylinder |
| CN104015717A (en) * | 2014-06-16 | 2014-09-03 | 清华大学 | Lockable electronic brake system actuator |
| CN104442783A (en) * | 2013-09-20 | 2015-03-25 | 吉林大学 | Initiative brakeage regulating system with failure backup of motor drive liquid chamber |
| CN106476777A (en) * | 2015-08-24 | 2017-03-08 | 陈晶杰 | Decoupling electro-hydraulic energy assisted braking system and braking method |
| CN116101240A (en) * | 2021-11-10 | 2023-05-12 | 长沙泊呈科技有限公司 | Pedal simulator for vehicle braking system and braking method |
-
2013
- 2013-09-20 CN CN201320581194.XU patent/CN203460857U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104442783A (en) * | 2013-09-20 | 2015-03-25 | 吉林大学 | Initiative brakeage regulating system with failure backup of motor drive liquid chamber |
| CN103950444A (en) * | 2014-04-14 | 2014-07-30 | 同济大学 | Electronic hydraulic brake system capable of reducing liquid outlets of main cylinder |
| CN103950444B (en) * | 2014-04-14 | 2017-07-07 | 同济大学 | A kind of EHB for reducing master cylinder liquid outlet |
| CN104015717A (en) * | 2014-06-16 | 2014-09-03 | 清华大学 | Lockable electronic brake system actuator |
| CN104015717B (en) * | 2014-06-16 | 2016-08-17 | 清华大学 | A kind of lockable electric brake system actuator |
| CN106476777A (en) * | 2015-08-24 | 2017-03-08 | 陈晶杰 | Decoupling electro-hydraulic energy assisted braking system and braking method |
| CN106476777B (en) * | 2015-08-24 | 2020-04-24 | 陈晶杰 | Decoupling electronic hydraulic power-assisted braking system and braking method |
| CN116101240A (en) * | 2021-11-10 | 2023-05-12 | 长沙泊呈科技有限公司 | Pedal simulator for vehicle braking system and braking method |
| CN116101240B (en) * | 2021-11-10 | 2024-04-23 | 长沙泊呈科技有限公司 | Pedal simulator for vehicle braking system and braking method |
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