CN101524989B - Electromagnetic retarder and control method of autocar wheel side - Google Patents
Electromagnetic retarder and control method of autocar wheel side Download PDFInfo
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- CN101524989B CN101524989B CN2009100300147A CN200910030014A CN101524989B CN 101524989 B CN101524989 B CN 101524989B CN 2009100300147 A CN2009100300147 A CN 2009100300147A CN 200910030014 A CN200910030014 A CN 200910030014A CN 101524989 B CN101524989 B CN 101524989B
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- brake disc
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Abstract
The invention discloses an electromagnetic retarder arranged on autocar wheel side and a control method thereof. A shaft coupling is arranged on a transmission shaft; the shaft coupling is connected with a semi shaft of an autocar; a rotatable slewing journal and a brake disc are sleeved outside the transmission shaft; an iron core winded with a winding and a friction detent provided with an ABS are fixed on the slewing journal; a rotation disc face of the brake disc is positioned in the iron core; and the winding is connected with an operation handle by a controller. The controller receives brake signals of the operation handle and speed signals fed back by a sensor, judges that whether the autocar has an emergency brake or a non-emergency brake, emits signals to control the size of current led to the winding during the non-emergency brake, and emits signals to control the size of current led to the winding and the size of liquid pressure of the friction detent during the emergency brake. The brake disc generates brake force opposite to the rotation direction when rotating in the winding. The invention can reduce action times of the detent, reduces temperature rise of the friction detent, and enhances the performance of a brake system and the road security.
Description
Technical field
The present invention relates to a kind of retarding device that is applied to the Modern Car brake system, be meant a kind of retarding device that is used to be installed on the car wheel limit especially, be specifically related to utilize electromagnetic principle to produce the electromagnetic retarder of lock torque.
Background technology
In the prior art, car generally is equipped with hydraulic brake system, wherein adopts plate disc brake in the majority, and it is the speed of coming the reduction of speed car by the friction between friction lining and the brake disc, realizes car brakeing.Because plate disc brake is worked under the operating mode of car high speed emergency braking, not only can produce ear-piercing noise, and the abrasion loss of friction lining is bigger, braking effect is not so good as low-tach braking well; And under the operating mode of the frequent non-emergent braking in urban district, need the driver constantly to step on brake pedal to low-intensity again, be accompanied by the continuous contact friction between friction lining and the brake disc, drg produces temperature rise, character of heat-fading occurs, reduced the performance and the safety performance of drg.
Summary of the invention
The objective of the invention is for overcoming the deficiencies in the prior art, provide a kind of stable and reliable for performance, can reduce the braking number of times, reduce the drg temperature rise that braking produces, improve contactless the car wheel limit electromagnetic retarder and the control method thereof of brake system service life and travel safety.
The technical scheme that car wheel of the present invention limit electromagnetic retarder adopts is: coupler is installed on transmission shaft, coupler links to each other with the car semiaxis, rotatable steering swivel of transmission shaft overcoat and brake disc, iron core around coil is fixed on the steering swivel with the friction brake that has ABS, the rotation card of brake disc is arranged in iron core, and coil is by controller attended operation handle.
The technical scheme that the control method of car wheel of the present invention limit electromagnetic retarder adopts is: controller is accepted the speed-slackening signal of operating handle and the vehicle speed signal of sensor feedback; Judge that car is emergency braking or non-emergent braking, non-emergent glancing impact controller sends the size that signal control feeds coil current, and controller sends the fluid pressure size that signal control feeds the size of coil current and has the friction brake of ABS during emergency braking; Brake disc rotates in coil and produces the braking force opposite with hand of rotation, and the transmission shaft rotating speed is descended, and realizes car brake.
The invention has the beneficial effects as follows:
1, car of the present invention wheel limit electromagnetic retarder is a kind of non-friction type drg, is a kind of retarding device that utilizes electromagnetic principle to produce lock torque.Changed that car shortens the service life of brake system because of the frequently braking by mechanical braking sytem and causes that the temperature rise of friction brake reduces the deceleration and stopping performance of drg in the prior art, can reduce the brakeage number of times, also can reduce the temperature rise of friction brake simultaneously, improve the performance and the traveling security of brake system.
2, the present invention adopts two kinds of modes: a kind of is the operating mode of emergency braking, and car is in high-revolving state, need vehicle be stopped; Another kind is the operating mode of non-emergency braking, and its car is in the cruising state, does not need vehicle is stopped, and only need lower the speed of car.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the front view of car wheel limit electromagnetic retarder;
Fig. 2 is the right elevation of Fig. 1;
Fig. 3 is the upward view of Fig. 1;
Fig. 4 is an A-A cutaway view among Fig. 3;
Fig. 5 is the control system scheme drawing of wheel limit electromagnetic retarder;
The control flow chart of non-emergent glancing impact in Fig. 6 control method of the present invention;
Control flow chart in Fig. 7 control method of the present invention during emergency braking.
The specific embodiment
As Fig. 1～4, coupler 5 is installed on transmission shaft 1, coupler 5 links to each other with the car semiaxis, gives transmission shaft 1 transmission of power.Rotatable steering swivel 2 of transmission shaft 1 overcoat and brake disc 3, transmission shaft 1 are with key 10 mounting flanges 11, and the end that loose rib 12, hexagonal fluting thin nut 15 and spring cotter 16 are positioned at transmission shaft 1 is fixed on flange 11 on the transmission shaft 1.Flange 11 links to each other with brake disc 3 by bolt 13, nut 14; Needle bearing 9 is installed between transmission shaft 1 and steering swivel 2, back-up ring 6,7,8 fix single duplex needle bearing 9, prevent that lubricating oil from missing, and realize that transmission shaft 1 rotates in steering swivel 2.The friction brake 21 that has ABS is fixedly linked by bolt and steering swivel 2.
As shown in Figure 5, the iron core 4 that is wound with coil 19 is fixed on the steering swivel 2, and the rotation card of brake disc 3 is arranged in iron core 4, and coil 19 is by controller 17 attended operation handles 18, controller 17 connects car speed sensor 20 and indicator lamp 22, is provided with control circuit in controller 17.
As Fig. 1～5, during control, controller 17 is accepted the speed-slackening signal of operating handle 18 and the vehicle speed signal of sensor 17 feedbacks; Judge that car is emergency braking or non-emergent braking, non-emergent glancing impact controller 17 sends the size that signal control feeds coil 19 electric currents, and controller 17 sends the fluid pressure size that signal control feeds the size of coil 19 electric currents and has the friction brake 21 of ABS during emergency braking.Brake disc 3 rotates in coil 19 and produces the braking force opposite with hand of rotation, and transmission shaft 1 rotating speed is descended, and realizes car brake.
As Fig. 1～5 and shown in Figure 6, when the non-emergent glancing impact of car, start bar handle 18 earlier, controller 17 receives after control signal and car speed sensor 20 signals, and promptly to 19 energisings of the coil on the iron core 4, the electric current that feeds maximum 25A is in coil 19.Produce magnetic field in the iron core 4, because travelling of automobile, thereby brake disc 3 rotations, brake disc 3 rotates cutting magnetic line in the iron core 4 that produces magnetic field, therefore produce current vortex in brake disc 3, thereby produce a braking force opposite with hand of rotation, the rotating speed of propeller-shaft 1 descends rapidly, detects the car wheel speed by car speed sensor 20 again, and compares with wheel speed v=30km/h, if the car wheel speed less than 30km/h, is then sent the signal that cuts off electric current by controller 17; If the car wheel speed is greater than 30km/h, then calculate the slip rate s of wheel, if slip rate s is greater than 0.15, controller 17 sends and reduces current signal, and less than 0.15, controller 17 sends the increase current signal as if slip rate s, be lower than 30km/h up to the car wheel speed, cut off electric current, under the effect of braking force, thus the gradual braking of realization car.
As Fig. 1～5 and shown in Figure 7, when car needed emergency braking, controller 17 started bar handle 18 and car speed sensor 20 signals according to the driver, the maximum current that feeds 25A in coil 19, the rotation generation braking force opposite of brake disc 3 with hand of rotation.Controller 17 sends hydraulic control signal, the size of the hydraulic pressure in the hydraulic actuating cylinder of friction brake 21, thus control has the lock torque that the friction brake 21 of ABS produces.Like this, the eddy current brake moment combined action that the friction braking moment that brake disc 3 can be rotated and the friction brake 21 that has ABS produce makes car be in best braking mode on brake disc 3.Detect the car wheel speed by car speed sensor 20, compare with wheel speed v=30km/h earlier, if the car wheel speed less than 30km/h, is then sent the signal that cuts off electric current by controller 17; If the car wheel speed greater than 30km/h, is then calculated the slip rate s of wheel, greater than 0.15, controller 17 sends the signal that reduces to feed friction brake 21 hydraulic pressures that have ABS as if slip rate s, and less than 0.15, controller 17 sends the increase hydraulic pressure signal as if slip rate s; When the car wheel speed is lower than 30km/h, car wheel speed and 0km/h are compared, if the car wheel speed greater than 0km/h, continues to provide hydraulic pressure static up to car, thereby realize the gradual braking of car.
Claims (6)
1. a car is taken turns the limit electromagnetic retarder, be included in transmission shaft (1) and go up installation coupler (5), coupler (5) links to each other with the car semiaxis, it is characterized in that: rotatable steering swivel of transmission shaft (1) overcoat (2) and brake disc (3), be fixed on the steering swivel (2) around the iron core (4) of coil (19) and the friction brake (21) that has an ABS, the rotation card of brake disc (3) is arranged in iron core (4), and coil (19) is by controller (17) attended operation handle (18).
2. car wheel according to claim 1 limit electromagnetic retarder, it is characterized in that: transmission shaft (1) is with key (10) mounting flange (11), and flange (11) connects brake disc (3); Between transmission shaft (1) and steering swivel (2), needle bearing (9) is installed.
3. car wheel according to claim 1 limit electromagnetic retarder, it is characterized in that: controller (17) connects car speed sensor (20) and indicator lamp (22), is provided with control circuit in controller (17).
4. the control method of a car as claimed in claim 1 wheel limit electromagnetic retarder is characterized in that adopting following steps:
A) controller (17) is accepted the speed-slackening signal of operating handle (18) and the vehicle speed signal of sensor (17) feedback;
B) judge that car is emergency braking or non-emergent braking, non-emergent glancing impact controller (17) sends the size that signal control feeds coil (19) electric current, and controller during emergency braking (17) sends the fluid pressure size that signal control feeds the size of coil (19) electric current and has the friction brake (21) of ABS;
C) brake disc (3) rotates in coil (19) and produces the braking force opposite with hand of rotation, and transmission shaft (1) rotating speed is descended, and realizes car brake.
5. control method according to claim 4, it is characterized in that: non-emergent glancing impact step B), feed the electric current of maximum 25A earlier in coil (19), brake disc (3) produces the opposite braking force of direction, detect wheel speed by car speed sensor (20) again, if wheel speed less than 30km/h, is then sent the signal that cuts off electric current by controller (17); If wheel speed greater than 30km/h, is then calculated the slip rate of wheel, if slip rate is greater than 0.15, controller (17) sends and reduces current signal, if slip rate is less than 0.15, controller (17) sends the increase current signal, cuts off electric current and finish braking after wheel speed is lower than 30km/h.
6. control method according to claim 4, it is characterized in that: step B) during emergency braking, feed the electric current of maximum 25A earlier in coil (19), brake disc (3) rotation produces the opposite braking force of direction, controller (17) sends the lock torque that friction brake (21) that hydraulic control signal control has ABS produces, and the lock torque combined action that lock torque that brake disc (3) rotation is produced and friction brake (21) produce is on brake disc (3); Detect wheel speed by car speed sensor (20) again, if wheel speed is less than 30km/h, then send the signal that cuts off electric current by controller (17), if wheel speed is greater than 30km/h, then calculate the slip rate of wheel, if slip rate is greater than 0.15, controller (17) sends and reduces to feed friction brake (21) hydraulic pressure signal; If slip rate is less than 0.15, controller (17) sends the increase hydraulic pressure signal; When wheel speed is lower than 30km/h and during greater than 0km/h, provides hydraulic pressure up to stopping braking again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100300147A CN101524989B (en) | 2009-03-31 | 2009-03-31 | Electromagnetic retarder and control method of autocar wheel side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100300147A CN101524989B (en) | 2009-03-31 | 2009-03-31 | Electromagnetic retarder and control method of autocar wheel side |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101524989A CN101524989A (en) | 2009-09-09 |
| CN101524989B true CN101524989B (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100300147A Expired - Fee Related CN101524989B (en) | 2009-03-31 | 2009-03-31 | Electromagnetic retarder and control method of autocar wheel side |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155508B (en) * | 2011-05-04 | 2013-03-13 | 江苏大学 | Permanent magnet braking and frictional braking combined brake and braking method |
| CN106677914B (en) * | 2017-01-18 | 2023-10-31 | 解靖峰 | Automatically adjustable automobile brake |
| CN107933541B (en) * | 2017-11-22 | 2020-05-05 | 江苏理工学院 | Electric automobile decoupling zero distributing type intelligence electromagnetic braking system |
| CN112503117B (en) * | 2020-11-28 | 2022-03-29 | 贵州凯星液力传动机械有限公司 | Control method of high-power hydraulic retarder |
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