CN104417511A - Electronic parking braking system - Google Patents
Electronic parking braking system Download PDFInfo
- Publication number
- CN104417511A CN104417511A CN201310413318.8A CN201310413318A CN104417511A CN 104417511 A CN104417511 A CN 104417511A CN 201310413318 A CN201310413318 A CN 201310413318A CN 104417511 A CN104417511 A CN 104417511A
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- Prior art keywords
- parking
- control unit
- brake system
- screw mandrel
- vehicle
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/06—Hill holder; Start aid systems on inclined road
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses an electronic parking braking system, comprising a control unit, a tilt angle sensor and guyed parking drive execution mechanisms, wherein the control unit is accessed into a finished vehicle communication network, and is used for providing a platform for processing an input/output signal ; the tile angle sensor is used for measuring a parking slope of a current parking pavement of a vehicle, and transmitting the measured parking slope to the control unit, so as to determine required strength of parking force; the guyed parking drive execution mechanisms are respectively arranged on left and right rear wheels of the vehicle, converting electric power into braking force, and braking the left and right rear wheels of the vehicle according to a control signal of the control unit. By adopting a guyed structure, the left rear wheel and the right rear wheel are respectively controlled by virtue of two independent motors, so that the electronic parking braking system has higher parking force, and reaches the tension requirements of over 1,000N for flat ground parking, and the tension requirements of over 1800N for parking on over 30 percent of ramps.
Description
Technical field
The present invention relates to a kind of electronic brake system, be applied to large-tonnage automobile.
Background technology
Electronic brake system (EPB:Electrical Park Brake) refers to and the provisional braking in driving conditions and the long time property braking function after stopping is combined, and realizes the technology of stopping brake by electronic control mode.Electronics parking brake is the technology being realized stopping brake by electronic control mode, its principle of work is identical with mechanical type parking brake, be all that the friction force produced by brake disc and brake facing reaches control stopping brake, only mode becomes electronic button from mechanical type parking brake pull bar before.
EPB system forms primarily of elements combinations such as electronic controller, motor, reducing gear, the Kai Heguan of control EPB system, as long as chaufeur presses the button of EPB electronic hand brake, after chaufeur presses the button, electric signal can be sent to electronic controller, electronic controller meeting starter motor, the electric signal according to input makes drg implement braking.
General automobile car weight is all at about 1.5 tons, as long as the pulling force of level land parking often hundreds of N, as long as and on the ramp of more than 30% parking also about 1000N just can meet the demands; And for large vehicle of conducting oneself with dignity, particularly deadweight is more than the vehicle of 4000KG, traditional motor just cannot meet the demands.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of electronic brake system, adopts stay-supported structure, and use 2 independently motor control left rear wheel and off hind wheel respectively, make it have larger parking power; Reach the pulling tension requirements at level land more than parking 1000N, and 30% with the pulling tension requirements of more than up gradient 1800N.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of electronic brake system, comprising:
One control unit, access car load communication network, provides the platform of input/output signal process,
One obliquity sensor, the parking gradient on the current stop road surface of measuring vehicle, and the parking gradient of measurement is passed to control unit, to determine the intensity of the parking power needed,
One stay-supported parking drives actuating unit, is installed on the left and right trailing wheel of vehicle respectively, and electric power is converted to braking force, and the control signal according to control unit implements braking to the left and right trailing wheel of vehicle.
In a preferred embodiment of the invention, also comprise a man machine interface load module and man machine interface output module,
Described man machine interface load module adopts press control, and press control, with the form of switching value, by direct wire connection control unit, and transmits the parking control signal of chaufeur input,
Described man machine interface output module adopts instruction lamp or caution sound, the mode of operation of prompting driver electronic emergency brake system.
In a preferred embodiment of the invention, described stay-supported parking drives actuating unit to comprise a built-in control desk,
The wire harness of one received signal, described wire harness connects described built-in control desk by a cable junction,
And one is installed on DC machine on built-in control desk, the output shaft end of described DC machine connects a train of reduction gears, and described train of reduction gears is rotated drive one feed screw nut and rotated,
One screw mandrel, runs through and arranges in feed screw nut, and described feed screw nut negative thread and coordinating with screw mandrel outside thread, make screw mandrel free-extension in feed screw nut, rotation become seesawing of screw mandrel,
Described screw mandrel end connects a car side brake by a drag-line.
In a preferred embodiment of the invention, described screw mandrel end arranges a cable connector, and cable connector comprises a U-type groove and side plate, stay cable end connects a cylinder, cylinder is positioned in U-type groove, and is fixed on side plate, and drag-line connects a car side brake.
In a preferred embodiment of the invention, described feed screw nut side arranges a ball-bearing casing and a thrust baring, and described ball-bearing casing and thrust baring can bear the excessive load in screw mandrel rotation process.
In a preferred embodiment of the invention, also comprise the device for monitoring tension that real-time value of thrust to be fed back to control unit by,
Described device for monitoring tension comprises one and arranges magnet ring on DC machine output shaft, a Hall element arranging magnet ring side.
In a preferred embodiment of the invention, the reduction ratio of described train of reduction gears is 1:25.
By technique scheme, the invention has the beneficial effects as follows:
The present invention reaches by respectively using a set of independently actuating unit at the left and right trailing wheel of vehicle the object strengthening parking power;
And control unit generation control signal is sent to DC servo motor, by speed reduction gearing, the high rotating speed of DC servo motor, little torque axis are changed to low rotation speed large torque, again by screw nut driven, be the straight-line motion of drag-line by the convert rotational motion of DC servo motor; The braking force that electronic parking system causes the demand automatically according to the testing result of obliquity sensor, monitors brake-pressure again with inch control unit thus forms closed loop control, until last braking force meets slope requirement;
Reach the pulling tension requirements at level land more than parking 1000N, and 30% with the pulling tension requirements of more than up gradient 1800N.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is principle of work block diagram of the present invention.
Fig. 2 is the structural representation that stay-supported parking of the present invention drives actuating unit.
Fig. 3 is enforcement parking that experimental bench carries out different current conditions at 24 DEG C and 100 DEG C of two kinds of temperature to electronic brake system and remove parking force value diagram of curves.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
With reference to Fig. 1, electronic brake system take control unit as core, can be divided into three parts comprise seven modules according to signal stream:
Wherein the input of (l) signal comprises: man machine interface input 100, vehicle-state 200, device for monitoring tension 300; (2) signal transacting comprises: control unit (ECU) 400; (3) signal exports and comprises: man machine interface exports 500, and stay-supported parking drives actuating unit 600, other electronic control units 700 of vehicle.
A. man machine interface input 100: chaufeur is to the load module of electronic brake system, and this module adopts button-pressing way, namely by pressing parking button operation electronic brake system.Button is with the form of switching value, and connect transmission by direct wire, ECU can inquire about this signal, by level signal being detected, concludes whether chaufeur operates button, and carries out which kind of operation;
B. vehicle-state 200: the state of vehicle comprises vehicle speed signal, engine signal, accelerator pedal signal, brake pedal signal, gear signal etc., can be obtained the status signal of these vehicles by vehicle electronics communication network by vehicle-mounted corresponding control panel.
Current automobile oneself possess type comparatively common in vehicle electronics network, as controller local area network (Control Aiea Network, CAN), Local Interconnect Network (Local Interconnect Network, LIN) etc.And in In-vehicle networking, determine there is the interdependent node such as engine management system (EMS) and automatic transmission with hydraulic torque converter (TCU), the acquisition for signal creates condition;
Judge that the gradient on the current stop road surface of vehicle is to determine the intensity of the parking power needed by obliquity sensor.
C. device for monitoring tension 300: Hall element and spring device, evenly bar-shaped magnet with the use of, pulling force is converted to displacement, and the movement of magnet makes the magnetic-field intensity acting on Hall element change, and is converted to voltage.By just can value of thrust be obtained to the detection of this voltage;
D. control unit (ECU) 400:ECU is design focal point place, is the base portion that electronic brake system controls, and control unit access car load communication network, provides the platform of input/output signal process;
E. man machine interface exports 500: for the operating condition of electronic brake system, chaufeur should also be necessary clearly.This module is adopted and is realized in two ways: indicator lamp and caution sound.To point out the mode of operation of chaufeur system, particularly mistake, faulty condition;
F. stay-supported parking drives actuating unit 600: to electronic brake system, motor is core component electric power being converted to power, under the effect of DC12V, enough moment and rotating speed must be produced, to ensure the requirement completing regulation parking power in specific time;
Stay-supported parking drives actuating unit, is installed on the left and right trailing wheel of vehicle respectively, and electric power is converted to braking force, and the control signal according to control unit implements braking to the left and right trailing wheel of vehicle.
With reference to Fig. 2, stay-supported parking drives actuating unit 600 to comprise a built-in control desk 601, the wire harness 602 of one received signal, wire harness 602 connects described built-in control desk 601 by a Waterproof cable joint 603, and one is installed on DC machine 604 on built-in control desk 601, output shaft 605 end of DC machine 604 connects a train of reduction gears 606, train of reduction gears 606 is rotated drive one feed screw nut 607 and is rotated, one screw mandrel 608, run through and arrange in feed screw nut 607, and feed screw nut 607 negative thread and coordinating with screw mandrel 608 outside thread, make screw mandrel 608 free-extension in feed screw nut 607, rotation is become seesawing of screw mandrel, screw mandrel 608 end arranges a cable connector 609, cable connector 609 comprises a U-type groove 610 and side plate 611, drag-line 612 end connects a cylinder 613, cylinder 613 is positioned in U-type groove 610, and be fixed on side plate 611, drag-line 612 connects a car side brake.
Feed screw nut 607 side arranges ball-bearing casing 614 and a thrust baring 615, and described ball-bearing casing and thrust baring can bear the excessive load in screw mandrel rotation process.
Device for monitoring tension 300 comprises the Hall element 302 that a magnet ring 301, arranged on DC machine output shaft arranges magnet ring 301 side.
No. 45 steel selected by gear, surface hardening, increase gear hardness, make more wear-resisting, effectively improve service life.Main stressed member screw mandrel, adopts bearing steel, and surface high frequency is quenched, and also ensure that toughness while ensureing rigidity.
The nut matched with it selects brass, flexible, and wear-resisting.The material of gear and working accuracy, ensure that EPB assembly under rugged environment reliable and, long-life work, meets design requirement completely.
G. other electronic control units 700 of vehicle: other control units relevant to parking also can receive the status signal of electronic brake system, reach more rationally to coordinate electronic brake system, the control effects of more high-quality.But for sending to the information of other electronic control units, need to coordinate with the design of other ECU to formulate.
Principle of work of the present invention:
1, braking during standstill is implemented
Implementing braking during standstill is step on brake pedal at chaufeur, electronic brake system analyzes the requirement whether being in and normally carrying out braking during standstill to its state, when vehicle is in normal situation, control electricity unit (ECU) as long as receive the on-off signal of the stop button that chaufeur is implemented, just according to program execution command, the stay-supported parking of being placed by bus transfer to left and right wheels drives actuating unit, thus control motor machine carries out corresponding action according to demand.
In order to make electronic parking system, there is perfect performance, when the braking during standstill power that demand is applicable to, also require that there is interference protection, the safety hazard produced under the abnomal conditions such as filtering maloperation, acquisition module needs to gather parking button signal, vehicle speed signal, the parking gradient, braking during standstill pressure be supplied to electronic control unit by bus in real time.
General braking procedure is the signal that electronic control unit catches when chaufeur presses parking button, enables braking interrupt service routine, and it, according to analyzing the supplemental characteristic collected transmitted in bus, be sure of whether current vehicle is in parking situation.When the speed of a motor vehicle is no more than speed of a motor vehicle threshold values and meets parking situation, electronic control unit issues parking instruction to control the action of parking motor by bus to parking brake module, completes braking during standstill.
When electronic control unit be sure of that braking during standstill pressure meets the pressure of now parking gradient demand, then locking.Parking indicator lamp becomes redness on the dash panel simultaneously.Due to the High Rotation Speed of motor, general rotating speed is more than 12000r/min, thus braking procedure is consuming time is no more than 2s, and the deceleration of mixing speed reduction gearing increases torsion effect, makes it produce rapidly required braking force to reach steadily halt.
The braking force that electronic parking system causes the demand automatically according to the testing result of obliquity sensor, monitors brake-pressure again with inch control unit thus forms closed loop control, until last braking force meets slope requirement.When not needing the action of motor completing braking during standstill, what parking and braking mechanism ensured vehicle stabilization by the mechanical self-latching of screw rod is in braking during standstill state.
2, braking during standstill is removed
Removing the general flow of braking during standstill is the signal that electronic control unit catches when chaufeur presses parking button, enable braking interrupt service routine, it is according to analyzing the supplemental characteristic collected transmitted in bus, judges now whether meet the situation removing braking during standstill.When brake pedal step on braking force is provided time, braking during standstill just can be removed, this process consuming time also relatively short, generally within 2s.
The present invention is owing to taking following measures:
A. revolution ratio is increased
The reduction ratio of EPB parking system reaches 1:25; By the unitized design of gear and screw mandrel, pinion rotation drives brass nut to rotate, and nut inner thread coordinates with screw mandrel outside thread, becomes seesawing of screw mandrel by rotating, because ratio of number of teeth comparatively greatly, so can reach higher reduction ratio.(Fig. 2)
B. more heavy-duty motor is selected
Motor rated power is selected to reach 180W;
C. outgoing current is improved
When rated current exports 12A, pulling force reaches 2400N, and when maximum current exports more than 20A, pulling force reaches more than 3000N;
D. the independent actuating unit of two covers is used
A set of independently actuating unit is respectively used to reach the object strengthening parking power at the left and right trailing wheel of vehicle.
Reach the pulling tension requirements at level land more than parking 1000N, and 30% with the pulling tension requirements of more than up gradient 1800N.
Table 1 is that automobile design demand contrasts with this paper deisgn product actual parameter, meets design requirement.
Table 1
Fig. 3 is enforcement parking that experimental bench carries out different current conditions at 24 DEG C and 100 DEG C of two kinds of temperature to electronic brake system and remove parking force value curve record;
Press EPB button, system carries out a retightening operation to auto model, reaches required braking force after 1.35s, and left and right pulling force all reaches more than 2400 oxen.Visible, the opening time of implementing braking is about 1.35; Same test obtains the releasing time and is about 1.05s.Reach designing requirement too.
More than show and describe groundwork of the present invention and principal character and advantage of the present invention.The technical personnel of the industry should be understood; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (7)
1. an electronic brake system, is characterized in that, comprising:
One control unit, access car load communication network, provides the platform of input/output signal process,
One obliquity sensor, the parking gradient on the current stop road surface of measuring vehicle, and the parking gradient of measurement is passed to control unit, to determine the intensity of the parking power needed,
One stay-supported parking drives actuating unit, is installed on the left and right trailing wheel of vehicle respectively, and electric power is converted to braking force, and the control signal according to control unit implements braking to the left and right trailing wheel of vehicle.
2. a kind of electronic brake system according to claim 1, is characterized in that: also comprise a man machine interface load module and man machine interface output module,
Described man machine interface load module adopts press control, and press control, with the form of switching value, by direct wire connection control unit, and transmits the parking control signal of chaufeur input,
Described man machine interface output module adopts instruction lamp or caution sound, the mode of operation of prompting driver electronic emergency brake system.
3. a kind of electronic brake system according to claim 1, is characterized in that: described stay-supported parking drives actuating unit to comprise a built-in control desk,
The wire harness of one received signal, described wire harness connects described built-in control desk by a cable junction,
And one is installed on DC machine on built-in control desk, the output shaft end of described DC machine connects a train of reduction gears, and described train of reduction gears is rotated drive one feed screw nut and rotated,
One screw mandrel, runs through and arranges in feed screw nut, and described feed screw nut negative thread and coordinating with screw mandrel outside thread, make screw mandrel free-extension in feed screw nut, rotation become seesawing of screw mandrel,
Described screw mandrel end connects a car side brake by a drag-line.
4. a kind of electronic brake system according to claim 3, it is characterized in that: described screw mandrel end arranges a cable connector, cable connector comprises a U-type groove and side plate, stay cable end connects a cylinder, cylinder is positioned in U-type groove, and being fixed on side plate, drag-line connects a car side brake.
5. a kind of electronic brake system according to claim 3, is characterized in that: described feed screw nut side arranges a ball-bearing casing and a thrust baring, and described ball-bearing casing and thrust baring can bear the excessive load in screw mandrel rotation process.
6. a kind of electronic brake system according to claim 3, is characterized in that: also comprise the device for monitoring tension that real-time value of thrust to be fed back to control unit by,
Described device for monitoring tension comprises one and arranges magnet ring on DC machine output shaft, a Hall element arranging magnet ring side.
7. a kind of electronic brake system according to claim 1, is characterized in that: the reduction ratio of described train of reduction gears is 1:25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310413318.8A CN104417511A (en) | 2013-09-11 | 2013-09-11 | Electronic parking braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310413318.8A CN104417511A (en) | 2013-09-11 | 2013-09-11 | Electronic parking braking system |
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| Publication Number | Publication Date |
|---|---|
| CN104417511A true CN104417511A (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310413318.8A Pending CN104417511A (en) | 2013-09-11 | 2013-09-11 | Electronic parking braking system |
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| CN (1) | CN104417511A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730425A (en) * | 2016-02-19 | 2016-07-06 | 安徽机电职业技术学院 | Control device and method for automatic parking of automobile |
| CN110550013A (en) * | 2018-05-31 | 2019-12-10 | 通用汽车环球科技运作有限责任公司 | Method and device for holding assistance of parking brake in motor vehicle |
| CN112572413A (en) * | 2019-09-29 | 2021-03-30 | 广州汽车集团股份有限公司 | Vehicle brake control method, device, computer equipment and storage medium |
| CN112918444A (en) * | 2021-03-22 | 2021-06-08 | 苏州大学 | Parking control method and device for self-moving equipment |
| CN113276818A (en) * | 2021-05-26 | 2021-08-20 | 南京理工大学 | Stay cable type double-EPB system and redundancy safety control method |
| CN113415262A (en) * | 2020-08-14 | 2021-09-21 | 中国第一汽车股份有限公司 | Engine starting and parking brake maintaining control method suitable for AT vehicle type |
| US11124169B2 (en) * | 2016-10-20 | 2021-09-21 | Zf Active Safety Gmbh | System comprising separate control units for the actuation units of an electric parking brake |
| CN114228674A (en) * | 2021-12-31 | 2022-03-25 | 长沙泊呈科技有限公司 | Automatic parking and parking releasing method and system |
| CN115009237A (en) * | 2022-07-25 | 2022-09-06 | 第一拖拉机股份有限公司 | Electronic parking device for tractor and control method thereof |
-
2013
- 2013-09-11 CN CN201310413318.8A patent/CN104417511A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730425A (en) * | 2016-02-19 | 2016-07-06 | 安徽机电职业技术学院 | Control device and method for automatic parking of automobile |
| US11124169B2 (en) * | 2016-10-20 | 2021-09-21 | Zf Active Safety Gmbh | System comprising separate control units for the actuation units of an electric parking brake |
| CN110550013A (en) * | 2018-05-31 | 2019-12-10 | 通用汽车环球科技运作有限责任公司 | Method and device for holding assistance of parking brake in motor vehicle |
| CN110550013B (en) * | 2018-05-31 | 2022-04-19 | 通用汽车环球科技运作有限责任公司 | Method and device for holding assistance of parking brake in motor vehicle |
| CN112572413A (en) * | 2019-09-29 | 2021-03-30 | 广州汽车集团股份有限公司 | Vehicle brake control method, device, computer equipment and storage medium |
| CN113415262A (en) * | 2020-08-14 | 2021-09-21 | 中国第一汽车股份有限公司 | Engine starting and parking brake maintaining control method suitable for AT vehicle type |
| CN112918444A (en) * | 2021-03-22 | 2021-06-08 | 苏州大学 | Parking control method and device for self-moving equipment |
| WO2022199564A1 (en) * | 2021-03-22 | 2022-09-29 | 苏州大学 | Parking control method and apparatus for self-moving device |
| CN113276818A (en) * | 2021-05-26 | 2021-08-20 | 南京理工大学 | Stay cable type double-EPB system and redundancy safety control method |
| CN114228674A (en) * | 2021-12-31 | 2022-03-25 | 长沙泊呈科技有限公司 | Automatic parking and parking releasing method and system |
| CN115009237A (en) * | 2022-07-25 | 2022-09-06 | 第一拖拉机股份有限公司 | Electronic parking device for tractor and control method thereof |
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Application publication date: 20150318 |