CN101508286B - Brake booster for electric motor - Google Patents
Brake booster for electric motor Download PDFInfo
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- CN101508286B CN101508286B CN2009100812516A CN200910081251A CN101508286B CN 101508286 B CN101508286 B CN 101508286B CN 2009100812516 A CN2009100812516 A CN 2009100812516A CN 200910081251 A CN200910081251 A CN 200910081251A CN 101508286 B CN101508286 B CN 101508286B
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- 238000004146 energy storage Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010008469 Chest discomfort Diseases 0.000 description 1
- 206010013911 Dysgeusia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention relates to a brake booster for electric vehicles and belongs to the technical field of electric vehicles. The device mainly comprises four parts: a motor-driven reciprocal circulation pressurization cylinder supercharging device, a high voltage energy storage device, an assistant force drive device and a controller. The controller is connected with the motor-driven reciprocal circulation pressurization cylinder supercharging device, the high voltage energy storage device, the assistant force drive device and a brake signal senor of an automotive brake respectively; the motor-driven reciprocal circulation pressurization cylinder supercharging device is connected with the high voltage energy storage device 2, and the high voltage energy storage device is connected with the assistant force drive device; and the assistant force drive device is connected with the car arrester 5. The brake booster for electric vehicles can save a vacuum booster device with the large volume, and facilitate the realization of the braking of assistant force simultaneously.
Description
Technical field
The invention belongs to the vehicle technology field, particularly the design of battery-driven car brake servo unit.
Background technology
Along with the development of ev industry, the actuating device of automobile has become battery from driving engine.Consider that hydraulic braking can realize forcing to move by convenient fast speed, guarantee the braking safety of automobile, still adopt traditional hydraulic brake system on the battery-driven car mostly.Because lost this degree of vacuum source of driving engine, the vacuum booster unit in the brake system can't be realized normal brake boost.
Owing to simple rely on the brake pedal braking force obviously to be difficult to satisfy promptly to force moving needs, and greatly increased the required treadle effort of chaufeur glancing impact, very easily make driver fatigue.The method of dealing with problems on the existing battery-driven car is to adopt the electronic vacuum servo-unit, and promptly at electronic vacuum generating means of orthodox car vacuum booster front end series connection, the mode that adopts the motor-driven piston pump to vacuumize provides degree of vacuum to vacuum booster.Though this method has realized brake boost, because this mode has still kept the vacuum booster of larger volume, occupied a large amount of machinery space spaces, be unfavorable for the space utilization of battery-driven car.
Summary of the invention
The objective of the invention is to propose a kind of electric vehicle brake servo unit, can remove bulky vacuum booster unit, can realize brake boost easily simultaneously for overcoming the weak point of prior art.
A kind of electric vehicle brake servo unit that the present invention proposes is characterized in that this brake servo unit mainly comprises:
Motor-driven reciprocal circulation pressurization cylinder pressurizer is used for pressurized air, obtains the high pressure air of drive brake work-saving device;
The high-voltage energy storage device is used to store high pressure air, is brake boost process energy reserve;
Assistant force drive device is used for braking procedure and follows brake pedal motion and simultaneously braking procedure is carried out power-assisted;
Controller is used to control the pressurization of whole brake servo unit pressurizer, and the break-make in power-assisted loop in the assistant force drive device, realizes brake boost;
The annexation of each several part is: controller links to each other with motor-driven reciprocal circulation pressurization cylinder pressurizer, high-voltage energy storage device, assistant force drive device and the drg speed-slackening signal of automobile sensor own respectively; Motor-driven reciprocal circulation pressurization cylinder pressurizer links to each other with the high-voltage energy storage device; The high-voltage energy storage device links to each other with assistant force drive device, and assistant force drive device links to each other with the drg of automobile itself.
Characteristics of the present invention and beneficial effect:
The present invention adopts controller control motor-driven reciprocal circulation pressurization cylinder pressurizer; Air compression to high pressure high-voltage energy storage device is stored; When the needs glancing impact, introduce high pressure gas in the piston cylinder of assistant force drive device under the conciliation of wedge shape air inlet valve in controller opens high pressure gas loop; Through the piston rod of leverage drive brake master cylinder, realize power-assisted.
This device adopts wedge shape air inlet valve control charge flow rate, and brake boost is than increasing and increase along with brake-pedal travel, has changed under the traditional vacuum power-assisted mode power-assisted than invariable power-assisted mode, make force moving more convenient.
Compare with traditional vacuum booster, work-saving device need not rely on driving engine degree of vacuum to drive.Therefore the brake boost problem in the time of can solving battery-driven car etc. and lack degree of vacuum.Owing to omitted vacuum booster, practiced thrift the space, reduced the realization cost.Pass through to regulate the pressure of high-voltage energy storage device simultaneously, the power-assisted ratio that realization that can be easy is different, and need not change structure, thereby have applicability widely.
This brake servo unit can be used for pure electric vehicle, fuel cell electric vehicle, and needs improve the car chassis electronic simulation T/S of speed-slackening signal etc.
Description of drawings
Fig. 1 is an electric vehicle brake servo unit structural representation of the present invention.
Fig. 2 is wedge shape air inlet valve 32 structural representations of battery-driven car brake servo unit work-saving device of the present invention.
Fig. 3 is controller 3 schematic diagrams of electric vehicle brake servo unit of the present invention.
The specific embodiment
A kind of electric vehicle brake servo unit that the present invention proposes combines accompanying drawing and embodiment to specify as follows.
Electric vehicle brake servo unit structure of the present invention is as shown in Figure 1, and this device mainly is made up of four parts: motor-driven reciprocal circulation pressurization cylinder pressurizer 1, be used for pressurized air, and obtain the high pressure air of drive brake work-saving device; High-voltage energy storage device 2 is used to store high pressure air, is brake boost process energy reserve; Assistant force drive device 3 is used for braking procedure and follows brake pedal motion and simultaneously braking procedure is carried out power-assisted; Controller 4 is used to control the pressurization of whole brake servo unit pressurizer 1, and the break-make in power-assisted loop 17 in the assistant force drive device 3, realizes brake boost.
The annexation of each several part is: controller 4 is connected with motor-driven reciprocal circulation pressurization cylinder pressurizer 1, high-voltage energy storage device 2, assistant force drive device 3 and the drg speed-slackening signal of automobile sensor circuit own respectively; Motor-driven reciprocal circulation pressurization cylinder pressurizer 1 links to each other through pressure gas pipeline 17 with high-voltage energy storage device 2, and high-voltage energy storage device 2 links to each other through power-assisted loop 23 with assistant force drive device 3.Assistant force drive device 3 links to each other with the drg 5 of automobile itself through power-assisted lever 36.
The specific embodiment structure and the function of each part mentioned above are explained as follows respectively.
Motor-driven reciprocal circulation pressurization cylinder pressurizer 1:
Turbin generator drives reciprocation cycle pressurized cylinder pressurizer 1 keystone configuration and comprises: first, second air inlet valve 161,181 and first, second one-way exhaust valve 162,182 in power supply DC 11, relay 12, DC machine M 13, first, second reciprocation cycle pressurized cylinder 16 and 18, oval cam actuating device 14 and control gaseous loop; The annexation of each several part is: power supply 11 passes through lead directly from the automotive battery power taking; DC machine M 13, relay 12, power supply DC 11 connect and compose motor control loop 19 successively; Relay 12 links to each other with controller 4, and controller 4 is through the energising and the outage of relay 12 control motors 13.Output shaft 131 front ends of motor 13 are through oval cam driver train 14 of bolt; Adopt support with reciprocation cycle pressurized cylinder 16,18 and motor output shaft 13 vertical installing and locating; Piston rod 163,183 1 ends in the pressurized cylinder 16 and 18 link to each other with 184 with pressurized cylinder spring 164, and the other end withstands on the cam drive mechanism 14.Breather cheek valve 161,181, one-way exhaust valve 162,182 are separately positioned on reciprocation cycle pressurized cylinder 16,18 both sides, control cut-offfing of reciprocation cycle pressurized cylinder 16,18 air inlets and exhausr port, and one-way exhaust valve 162,182 links to each other and constitutes pressure gas pipelines 17.
The principle of work of motor-driven reciprocal circulation pressurization cylinder pressurizer 1 is: piston rod 163 and 183 crank motion in pressurized cylinder 16,18 when motor 13 rotations.When the piston rod 163 in the pressurized cylinder 16,18 and 183 during to intermediary movements, breather cheek valve 161 and 181 is opened, and one-way exhaust valve 162 and 182 is closed, in air admission piston cylinder 16 and 18 the cavity; When moving, breather cheek valve 161 and 181 is closed to both sides (piston cylinder bottom) when piston rod 163 and 183, and one-way exhaust valve 162 and 182 is opened, and pressurized air gets in the cavity of high-voltage energy storage devices 22 through pipeline 17.Check valve 161,181,162 and 182 adopt the mode of pressure limiting spring extruding small ball to realize the sealing in loop.The intensity of pressure limiting spring is adjusted according to Structural Design Requirement.
High-voltage energy storage device 2:
The high-voltage energy storage device mainly is made up of piston cylinder that carries out compressed gas storage 22 and gas pressure sensor.In the middle of the piston cylinder be can sway piston, the piston right side is equipped with the compression spring 24 that meets GB HB8292-2002 extra fine grade, gas pressure sensor 21 is installed in bottom piston cylinder 22 high pressure chests, piston cylinder low-pressure cavity (right chamber) and atmosphere are connected.Piston cylinder 22 breaks UNICOM through two branch roads of pipeline 17 and the height of pressurized cylinder 16,18, the left chamber of servo cylinder through high pressure gas loop 23 and brake booster 3 33 UNICOM.
The principle of work of high-voltage energy storage device is: when piston cylinder was not inflated, spring was in free state.When pressure gas got into, the compression energy through spring 24 storage high pressure gas increased the speed that high pressure gas get into the servo cylinder 33 of brake booster 3 at power-assisted process medi-spring 24 rapid release.The pressure that measures when pressure sensor 21 is during less than the pressure set; Controller is opened motor-driven reciprocal circulation pressurization cylinder pressurizer 1; Pressure gas promptly gets into the left chamber of piston cylinder 22 through piping 17, along with gas constantly gets into, gaseous tension raises gradually; Spring 24 is gradually reduced, till pressure reaches setting pressure.
Assistant force drive device 3:
Brake booster 3 mainly is made up of a servo cylinder 33, two-position three way electromagnetic switch valve 31, power-assisted lever 36 and screw rod 37, and wedge shape air inlet valve 32, pull back spring 34 and piston 35 are installed in the servo cylinder 33; The annexation of each several part is: piston rod 35 right-hand members of servo cylinder 33 connect wedge shape air inlet valve 32, and left end links to each other with power-assisted lever 36 through pull back spring 34; The power-assisted lever is fixed on the vehicle body through the screw rod on the locating support 37; Power-assisted lever 36 can rotate around screw rod 37; Servo cylinder 33 links to each other with the piston cylinder 22 of high-voltage energy storage device through two-position three way electromagnetic switch valve 31, and (gas return path links to each other with power-assisted in servo cylinder 33 left chambeies, through 31 controls of two-position three way electromagnetic switch valve in formation high pressure gas loop 23.Switch valve 31 lower side position are the path in the left chamber of UNICOM high pressure gas loop 23 and servo cylinder 33; Switch valve 31 upper side positions have two passages, and the joint in left side is for being communicated with the seal in high pressure gas loop 23, and the right side is the pressure release exhaust passage of UNICOM's servo cylinder 33 left chambeies and atmosphere).The piston rod 54 of the master brake cylinder of the upper end of power-assisted lever 36 and automobile itself is hinged, with piston rod 54 interlocks.Pull back spring 34 realizes braking the return that unclamps primary piston bar 35 in the servo cylinder.
The principle of work of brake booster is: when stepping on brake pedal and need power-assisted, controller gives switch valve 31 energisings, moves on the switch valve 31, is communicated with the left chamber of high pressure gas loop 23 and servo cylinder 33; During take-off the brake, switch valve 31 moves down, and breaks off high pressure gas loop 23, and the left chamber with servo cylinder 33 is connected with atmosphere simultaneously.
The principle of work of the wedge shape air inlet valve 32 of servo cylinder 33 is as shown in Figure 2, and when wedge valve 32 moves right when servo cylinder 33 admission ports are sealed, shown in Fig. 2 a, high pressure gas and servo cylinder 33 are isolated; When piston 35 bars of servo cylinder 33 drive the wedge valve motion to the right (among Fig. 2 shown in the double-lined arrow); Shown in Fig. 2 b and 2c; The air inlet aperture increases gradually, and the flow that high pressure gas (among Fig. 2 shown in the single line arrow) get into servo cylinder 33 right chambeies increases, thereby realizes brake boost than increasing and increase along with brake-pedal travel; Changed that power-assisted makes that than invariable power-assisted mode high strength or emergency braking are more convenient under the traditional vacuum power-assisted mode.
Controller 4:
It is the mega48 8-bit microcontroller of
company that controller 4 adopts main control chip.Obtain the speed-slackening signal of speed-slackening signal sensor 52 in pressure sensor 21 pressure signals and the drg 5 in the high-voltage energy storage device 2 through the I/O port.Through I/O port controlling relay 12 control supercharging motor switch, control the high pressure gas loop that power-assisteds are done device through the electromagnetic valve 31 of two-position three way.
The working process of electric vehicle brake servo unit of the present invention is as shown in Figure 3, comprising: gas compression thermal energy storage process, brake boost process, 4 mode of operations such as compensation of brake boost pressure process and pressure leak process.Concrete flow process is explained as follows respectively.
The gas compression thermal energy storage process:
Set the upper pressure limit of closed-center system 2 through controller 4.Give relay 12 energisings, UNICOM's motor-drive circuit; When not having speed-slackening signal (the speed-slackening signal sensor 52 output speed-slackening signals in brake pedal all have this sensor in the car brake), the air electromagnetic switch valve 31 of two-position three way breaks off.Along with pressurized air constantly increases from pipeline 17, high-voltage energy storage device pressure raises gradually.High pressure gas can be advanced to rapidly in the servo cylinder 33 when making power-assisted.When the pressure sensor gaging pressure reached setting value, controller 4 broke off the relay 14 of motor 13 driving circuits, and motor is shut down.
The brake boost process:
When chaufeur was stepped on brake pedal, braking sensor 52 was to controller braking generation signals, and electromagnetic switch valve 31 is connected compressed air lines 23 are done the servo cylinder 33 of device 3 to brake boost the pipeline in left chamber.Along with brake pedal 53 is operated, the piston rod 54 in the master brake cylinder 55 moves right, and braking liquid is squeezed into wheel cylinder realizes braking.At this moment; Because piston cylinder 54 moves right, under the effect of lever 36, the piston rod 35 in the brake booster 3 moves right; Thereby the wedge shape air inlet valve 32 in the traction piston cylinder 33 moves right, and opens the admission port that pressurized air gets into servo cylinder 33 left chambeies gradually.Because the left chamber of piston cylinder 33 links to each other with atmosphere, under the pressure differential effect of chamber, the left and right sides, overcomes aftertaste spring 34 to left movement, further promote the lower end of lever 36, thereby power-assisted is delivered on the piston rod 54 of master brake cylinder 55, realize brake boost.Increase along with the piston rod 54 of master brake cylinder 55 moves right displacement, the aperture of wedge shape air inlet valve 31 increases, and the high pressure gas flow increases, and makes servo cylinder 33 left and right sides pressure reduction increase sharply, and realizes power-assisted faster.Through the gaseous tension of setting high-voltage energy storage device 2 and the opening degree of dip of wedge shape air inlet valve 31, can design the brake boost curve that needs.
The compensation of power-assisted pressure process:
High-voltage energy storage device 2 inner high voltage gases enter into brake boost through power-assisted pipeline 23 and do device 3, the pressure decay in the high-voltage energy storage device 2 when power-assisted.When the pressure of measuring through sensor 21 was lower than the pressure of setting, controller 4 was opened relay 12, starter motor 13 supplementary pressures.Thereby guarantee the power-assisted effect in whole braking procedure.
Pressure leak process:
When the chaufeur loosen the brake; Controller 5 drives electromagnetic switch valves 31, and pressurized air loop 23 is blocked, and the right chamber of piston cylinder 33 is linked to each other with atmosphere; High pressure gas in the work-saving device are drained in the atmosphere; Under the effect of pull back spring 34, piston rod 35 moves to right, and wedge valve 32 is closed admission port.
Claims (5)
1. an electric vehicle brake servo unit is characterized in that, this brake servo unit mainly comprises:
Motor-driven reciprocal circulation pressurization cylinder pressurizer is used for pressurized air, obtains the high pressure air of drive brake work-saving device;
The high-voltage energy storage device is used to store high pressure air, is brake boost process energy reserve;
Brake booster is used for braking procedure and follows brake pedal motion and simultaneously braking procedure is carried out power-assisted;
Controller is used to control the pressurization of whole brake servo unit pressurizer, and the break-make in power-assisted loop in the brake booster, realizes brake boost;
The annexation of each several part is: controller links to each other with motor-driven reciprocal circulation pressurization cylinder pressurizer, high-voltage energy storage device, brake booster and the drg speed-slackening signal of automobile sensor own respectively; Motor-driven reciprocal circulation pressurization cylinder pressurizer links to each other with the high-voltage energy storage device; The high-voltage energy storage device links to each other with brake booster, and brake booster links to each other with the drg of automobile itself.
2. brake servo unit according to claim 1; It is characterized in that; Said motor-driven reciprocal circulation pressurization cylinder pressurizer mainly comprises: first, second breather cheek valve and first, second one-way exhaust valve in power supply, relay, DC machine, first, second reciprocation cycle pressurized cylinder, oval cam driver train and control gaseous loop; The annexation of each several part is: directly from the automotive battery power taking, DC machine, relay, power supply connect and compose motor control loop to said power supply successively through lead; The output shaft front end of motor is installed with the oval cam driver train; Install vertical of said first, second reciprocation cycle pressurized cylinder with motor output shaft; Piston rod one end in first, second pressurized cylinder links to each other with cylinder inner spring separately, and the other end of the piston rod in first, second pressurized cylinder withstands on the cam drive mechanism respectively; First breather cheek valve, first one-way exhaust valve are separately positioned on the first reciprocation cycle pressurized cylinder both sides; Second breather cheek valve, second one-way exhaust valve are separately positioned on the second reciprocation cycle pressurized cylinder both sides, and first, second one-way exhaust valve links to each other and constitutes the pressure gas pipeline.
3. a kind of brake servo unit according to claim 1 is characterized in that, said high-voltage energy storage device mainly is made up of piston cylinder that carries out compressed gas storage and gas pressure sensor; Be provided with the piston of sway in the middle of the piston cylinder, the piston right side is equipped with compression spring, and said gas pressure sensor is installed in bottom, chamber, piston cylinder (a 22) high pressure left side, and right chamber of piston cylinder low pressure and atmosphere are connected.
4. a kind of brake servo unit according to claim 3; It is characterized in that; Said brake booster mainly is made up of a servo cylinder, two-position three way electromagnetic switch valve, power-assisted lever and screw rod, and wedge shape air inlet valve, pull back spring and piston are installed in the servo cylinder; The annexation of each several part is: servo cylinder links to each other with the piston cylinder of high-voltage energy storage device through the two-position three way electromagnetic switch valve; The piston rod right-hand member of servo cylinder connects the wedge shape air inlet valve; The piston rod left end of servo cylinder links to each other with power-assisted lever one end; Pull back spring is arranged on the piston left side of servo cylinder, and the piston rod of the master brake cylinder of the power-assisted lever other end and automobile itself is hinged; The power-assisted lever is fixed on the vehicle body through the said screw rod on the locating support.
5. a kind of brake servo unit according to claim 1 is characterized in that, said controller adopts 8-bit microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100812516A CN101508286B (en) | 2009-03-31 | 2009-03-31 | Brake booster for electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100812516A CN101508286B (en) | 2009-03-31 | 2009-03-31 | Brake booster for electric motor |
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| Publication Number | Publication Date |
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| CN101508286A CN101508286A (en) | 2009-08-19 |
| CN101508286B true CN101508286B (en) | 2012-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100812516A Active CN101508286B (en) | 2009-03-31 | 2009-03-31 | Brake booster for electric motor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103818369A (en) * | 2014-02-27 | 2014-05-28 | 南京舜唐科技有限公司 | High-pressure brake assisting control system of electric motor coach |
| CN104015623B (en) * | 2014-06-11 | 2017-01-25 | 苏州市京达环卫设备有限公司 | Vehicle control system of blade electric vehicle and blade electric vehicle structure |
| CN108146415B (en) * | 2018-01-05 | 2023-03-31 | 瑞立集团瑞安汽车零部件有限公司 | Electronic parking integrated valve and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5476029A (en) * | 1993-09-20 | 1995-12-19 | Tokico Ltd. | Pneumatic booster having vacuum and pressurized air sources |
| US5526729A (en) * | 1992-12-11 | 1996-06-18 | Tokico Ltd. | Booster of gaseous pressure type |
| US5558001A (en) * | 1993-06-17 | 1996-09-24 | Tokico Ltd. | Pneumatic booster |
| EP1160142A1 (en) * | 2000-06-02 | 2001-12-05 | Analisis y Simulacion, S.L. | Servo brake system |
-
2009
- 2009-03-31 CN CN2009100812516A patent/CN101508286B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526729A (en) * | 1992-12-11 | 1996-06-18 | Tokico Ltd. | Booster of gaseous pressure type |
| US5558001A (en) * | 1993-06-17 | 1996-09-24 | Tokico Ltd. | Pneumatic booster |
| US5476029A (en) * | 1993-09-20 | 1995-12-19 | Tokico Ltd. | Pneumatic booster having vacuum and pressurized air sources |
| EP1160142A1 (en) * | 2000-06-02 | 2001-12-05 | Analisis y Simulacion, S.L. | Servo brake system |
Non-Patent Citations (1)
| Title |
|---|
| 张欣宇等.一种用于电动汽车的真空助力制动系统设计.《北京汽车》.2007,(第6期),27-29. * |
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