CN113389825A - Gap regulation and control device and method for electronic mechanical brake - Google Patents
Gap regulation and control device and method for electronic mechanical brake Download PDFInfo
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- CN113389825A CN113389825A CN202110538685.5A CN202110538685A CN113389825A CN 113389825 A CN113389825 A CN 113389825A CN 202110538685 A CN202110538685 A CN 202110538685A CN 113389825 A CN113389825 A CN 113389825A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
- F16D65/095—Pivots or supporting members therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
- F16H37/124—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types for interconverting rotary motion and reciprocating motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/082—Planet carriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a gap regulating and controlling device and method of an electronic mechanical brake, which comprises the following steps: the brake comprises a brushless direct current torque motor, a secondary planetary gear speed reducing and torque increasing mechanism connected with the torque motor, a ball screw connected with the secondary planetary gear speed reducing and torque increasing mechanism, a sleeve in threaded connection with a ball screw bolt, brake blocks respectively attached to the sleeve and an inlay, friction plates fixed on the brake blocks, a guide pin fixed in the middle of the inlay, and a brake disc located between the two brake blocks. The clearance regulating and controlling method of the electronic mechanical brake respectively identifies the contact and separation critical points of the brake friction plate and the brake disc by utilizing the change signals of the rotating speed and the current of the motor, and solves the problems of increased cost, increased installation space and complex structure caused by adding various sensors.
Description
Technical Field
The invention belongs to the technical field of vehicle braking safety, and relates to a clearance regulating and controlling method of an electronic mechanical brake.
Background
With the overall development of automobile technology, automobiles are no longer just the tools of people for transportation, automobiles are developing towards safety, energy conservation and intellectualization, and the driving braking technology is continuously improved as one of the main factors influencing the driving safety. Conventional hydro-mechanical brake systems are gradually evolving towards brake-by-wire systems. The current brake-by-wire system mainly includes two types of electronic hydraulic brakes and electronic mechanical brakes. Compared with the traditional mechanical hydraulic brake, the electronic mechanical brake adopts electric power as a power source, abandons a complex hydraulic execution system, and has the advantages of simple structure, small volume, high response speed, high control precision, energy conservation, environmental protection and the like.
The braking of the vehicle is a friction process accompanied by high temperature and high pressure, which is easy to oxidize the brake friction plate to generate abrasion, thus seriously affecting the driving safety. To solve this problem, the following two schemes are mainly adopted at present: (1) and adding a mechanical automatic adjusting device to complete automatic compensation of the brake clearance. Such as wedge type clearance self-adjusting devices, piston rubber sealing rings, etc. (2) The structure of the brake is improved, a certain sensor is arranged in the brake to detect the change of related parameters, then corresponding parameter signals are transmitted to a central control unit (ECU), and the central control unit controls a torque motor to ensure the braking clearance. Such as displacement sensors, pressure sensors, etc.
The adjustment of the clearance can be completed by adopting the schemes (1) and (2), but the scheme (1) causes the structure of the brake to be bulky and the size to be increased due to the addition of an additional mechanical auxiliary mechanism. The solution (2) causes problems of complexity of structure and increase of cost due to addition of an additional sensor in the brake.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a clearance adjusting and controlling method of an electronic mechanical brake, which comprises the following steps: the change characteristic of the motor rotating speed is used for identifying the contact critical point of the brake friction plate and the brake disc, and the change characteristic of the current is used for identifying the separation critical point of the brake friction plate and the brake disc. The problems of increased cost, increased installation space and complex structure of the brake system caused by the addition of various sensors are solved.
The technical scheme adopted by the invention is as follows:
a clearance regulating and controlling device of an electronic mechanical brake comprises a torque motor 4, a secondary planetary gear speed reducing and torque increasing mechanism 11 connected with the torque motor 4, a ball screw 15 connected with the secondary planetary gear speed reducing and torque increasing mechanism 11, a sleeve 2 in threaded connection with the ball screw 15 through a bolt, a first brake block 16 and a second brake block 20 respectively attached to the sleeve 2 and an inlay 1, a first friction plate 17 and a second friction plate 19 respectively fixed on the first brake block 16 and the second brake block 20, a guide pin 5 fixed in the middle of the inlay, and a brake disc 18 positioned between the two brake blocks;
and (3) braking process: the torque motor (4) positively rotates to drive the secondary planetary gear speed-reducing and torque-increasing mechanism (11), the secondary planetary gear speed-reducing and torque-increasing mechanism (11) converts the rotary motion into the axial movement of the sleeve (2) through the ball screw (15), and drives the first friction plate (17) and the second friction plate (19) to axially move to press the brake disc (18).
And (3) a release process: the torque motor (4) reversely rotates to drive the secondary planetary gear speed-reducing and torque-increasing mechanism (11), the secondary planetary gear speed-reducing and torque-increasing mechanism (11) converts the rotary motion into the axial reverse movement of the sleeve (2) through the ball screw (15), and drives the first friction plate (17) and the second friction plate (19) to release the brake disc (18).
Further, the secondary planetary gear speed reduction and torque increase mechanism 11 comprises a primary planet gear 7, a primary gear ring 8, a primary central gear 6, a primary planet carrier 13, a secondary planet gear 9, a secondary gear ring 10, a secondary central gear 14 and a secondary planet carrier 12; the torque motor 4 drives the primary central wheel 6 to rotate, the primary central wheel 6 drives the primary planet wheel 7 to rotate along the primary gear ring 8 through gear transmission, the primary planet wheel rotates and transmits motion to the secondary central wheel 14 through the primary planet carrier 13, and the secondary central wheel transmits motion to the secondary planet carrier 12 through the secondary planet wheel 9 and along the secondary gear ring 10; the secondary planet carrier drives the ball screw 15 to convert the rotary motion into the axial movement of the sleeve 2 through the screw bolt 3.
The invention discloses a clearance regulating method of an electronic mechanical brake, which comprises the following steps:
s1, when the driver steps on the brake pedal, the brake signal is transmitted to the central controller of the electronic mechanical brake, the central controller sends a brake instruction to the motor controller to apply positive voltage to the torque motor 4 to drive the torque motor to rotate positively;
s2, the motor rotates positively to drive the two-stage planetary gear speed reducing and torque increasing mechanism 11 to reduce and increase torque, and then the rotating motion transmitted by the speed reducing and torque increasing mechanism is converted into the axial movement of the sleeve 2 through the ball screw 15;
s3, the ball screw bolt 3 pushes the first brake block 16 and the second brake block 20 to press the brake disc 18 to eliminate the brake clearance through the thread transmission with the sleeve 2;
s4, in the process of eliminating the brake clearance, the rotating speed of the motor is continuously increased to the maximum value so as to eliminate the brake clearance as soon as possible, when the first friction plate 17 and the second friction plate 19 are in contact with the brake disc 18, the elimination of the brake clearance is just completed, the rotating speed of the motor begins to suddenly decrease, and the electronic mechanical brake reads the rotating speed of the torque motor through a tachometer;
s5, when the starting point that the rotating speed of the torque motor 4 is suddenly reduced from the maximum value is detected, the contact critical point of the brake friction plate and the brake disc 18 is considered to be reached, namely the elimination of the brake clearance is just finished at the moment, and then the braking force following stage is started;
s6, in the braking force following stage, the rotating speed of the motor is sharply reduced to zero, the clamping force on the brake disc 18 reaches the maximum value at the moment, and the braking gap generating stage is started until the braking purpose is finished;
s7, in the stage of generating the braking clearance, the central controller of the electronic mechanical brake applies reverse voltage to the torque motor through the motor controller, the torque motor is driven to rotate reversely, the braking friction plate and the braking disc 18 start to separate, and the motor current is continuously reduced; the electronic mechanical brake controller transmits current change data of the torque motor through the current sensor;
s8, when the controller of the electromechanical brake detects that the rate of change of the current becomes zero for the first time, it is determined that the brake pad and the brake disc 18 reach the separation critical point.
Furthermore, a tachometer, a current sensor and a time delay device are arranged in the electronic mechanical brake controller.
The invention has the beneficial effects that:
the clearance regulating and controlling method of the electronic mechanical brake can accurately identify the contact and separation critical point of the brake friction plate and the brake disc by using the change characteristics of the motor rotating speed and the current brake in the braking process. Compared with the prior art, the problems of large structure, large installation space, high cost and the like caused by the installation of a sensor or a mechanical assistance mechanism on the electronic mechanical brake can be effectively solved.
Braking of a vehicle is a friction process with high temperature and high pressure, which causes the brake lining to wear and cause the brake clearance to be too large. The clearance regulating and controlling method of the electromechanical brake can effectively shorten the response time of the brake, accurately ensure the braking clearance and improve the braking efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an electromechanical brake device.
Fig. 2 is a schematic diagram of a gap adjustment process of the electromechanical brake.
FIG. 3 is a schematic diagram of a brake system function module according to the method for adjusting clearance of an electromechanical brake of the present invention.
Fig. 4 is a schematic diagram illustrating a process of identifying a contact critical point by the motor speed.
Fig. 5 is a schematic diagram of a process for identifying separation critical points by motor current.
Fig. 6 is a schematic diagram of the experimental verification platform for the gap regulation and control method of the electromechanical brake.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
In order to verify the effectiveness of the control strategy, an experiment platform shown in fig. 6 is provided, the experiment detects the change condition of the clamping brake tightening force through a pressure sensor, detects the change characteristic of the motor current through a current sensor, measures the change information of the motor rotating speed through a tachometer, then transmits a signal detected by the sensor to a data acquisition module, and the data acquisition module transmits data to an upper computer for analysis through A/D conversion.
Referring to fig. 1 to 6, a gap adjusting and controlling method of an electromechanical brake according to the present invention includes: the brake comprises a driving torque motor 4, a secondary planetary gear speed reducing and torque increasing mechanism 11 connected with the torque motor, a ball screw 15 connected with the secondary planetary gear speed reducing and torque increasing mechanism, a sleeve 2 in threaded connection with the ball screw, brake blocks 16 and 20 respectively attached to the sleeve and an inlay, friction plates 17 and 19 fixed on the brake blocks, a guide pin 5 fixed in the middle of the inlay and a brake disc 18 positioned between the two brake blocks; the secondary planetary gear speed-reducing and torque-increasing mechanism 11 comprises a primary planetary gear 7, a primary gear ring 8, a primary central gear 6, a primary planet carrier 13, a secondary planetary gear 9, a secondary gear ring 10, a secondary central gear 14 and a secondary planet carrier 12.
When the two-stage planetary gear speed-reducing torque-increasing mechanism works, the torque motor 4 drives the first-stage central wheel 6 in the second-stage planetary gear speed-reducing torque-increasing mechanism 11 to rotate; the primary central wheel 6 drives the primary planet wheel 7 to rotate along the primary gear ring 8 through gear transmission, the primary planet wheel rotates and transmits motion to the secondary central wheel 14 through the primary planet carrier 13, and the secondary central wheel transmits motion to the secondary planet carrier 12 through the secondary planet wheel 9 along the secondary gear ring 10; the secondary planet carrier drives the ball screw 15 to convert the rotary motion into the axial movement of the sleeve 2 through the screw bolt 3. The sleeve 2 and the first friction plate 17 move axially to eliminate the right brake gap and press the brake disc 18, and the pressure on the brake disc is increased continuously, the brake disc 18 applies a reaction force to the whole brake through the first friction plate 17, so that the brake moves to the right through the guide pin 5 to drive the second friction plate 19 to eliminate the right brake gap and press the brake disc 18.
The control method comprises the following steps:
and S1, when the driver steps on the brake pedal, the brake signal is transmitted to the central controller of the electronic mechanical brake, and the central controller sends a brake command to the motor controller to apply positive voltage to the torque motor 4 to drive the torque motor to rotate positively.
S2, the motor 4 rotates forward to drive the two-stage planetary gear speed reducing and torque increasing mechanism 11 to reduce speed and increase torque, and then the rotation motion transmitted by the speed reducing and torque increasing mechanism 11 is converted into the axial movement of the sleeve 2 through the ball screw 15.
S3, the ball screw bolt 3 pushes the first and second brake shoes 16 and 20 to be pressed against the brake disc by the screw transmission with the sleeve 2 to eliminate the braking gap.
S4, during the brake clearance elimination process, the rotation speed of the motor 4 is continuously increased to the maximum value so as to eliminate the brake clearance as soon as possible. When the first and second friction plates 17 and 19 are in contact with the brake disk 18, the elimination of the brake clearance is just completed, and the rotation speed of the motor 4 starts to decrease abruptly. The electronic mechanical brake reads the rotating speed of the torque motor through a tachometer.
S5, when the starting point of the sudden decrease of the rotation speed of the torque motor 4 from the maximum value is detected, it is considered that the critical point of the contact between the first and second friction plates 17 and 19 and the brake disk 18 is reached, that is, the elimination of the brake clearance is just completed, and then the braking force following phase is entered.
S6, the rotation speed of the motor 4 is sharply reduced to zero in the braking force following phase. The clamping force of the brake disk 18 is then at a maximum until the braking is completed and the brake clearance generation phase is entered.
S7, in the stage of generating the braking gap, the central controller of the electronic mechanical brake applies reverse voltage to the motor 4 through the motor controller to drive the motor 4 to rotate reversely, the first and second friction plates 17 and 19 start to separate from the brake disc, and the current of the motor 4 is continuously reduced. The electronic mechanical brake controller transmits the current change data of the torque motor through the current sensor.
S8, when the controller of the electromechanical brake detects that the rate of change of the current first becomes zero, it is determined that the first and second friction plates 17 and 19 and the brake disk 18 reach the separation critical point.
The controller of the electronic mechanical brake is internally provided with a tachometer, a current sensor and a delayer.
The braking process of the electromechanical brake device is divided into three stages, namely a brake clearance eliminating stage, a brake force following stage and a brake clearance generating stage. The detailed process is as follows: in the stage of eliminating the braking clearance, a driver sends out a braking intention, a signal is transmitted to the torque motor controller through the central controller of the electronic mechanical brake to apply a certain forward voltage to the two ends of the torque motor 4, and the motor drives the primary central wheel 6 of the secondary planetary gear speed reducing and torque increasing mechanism 11 to rotate in a forward direction; the primary central wheel drives a primary planet wheel 7 to rotate along a primary gear ring 8 through gear transmission, the primary planet wheel rotates to transmit motion to a secondary central wheel 14 through a primary planet carrier 13, and the secondary central wheel transmits the motion to a secondary planet carrier 12 through a secondary planet wheel 9 along a secondary gear ring 10; the secondary planet carrier drives the ball screw 15 to convert the rotary motion into the axial movement of the sleeve 2 through the screw bolt 3. When the sleeve 2 is moved axially, the brake pads on it will press rapidly against the brake disk 18, which will provide a reaction force to the entire brake actuator, so that the actuator as a whole moves to the right along the guide pin 5 and drives the second pad 19 also rapidly towards the brake disk. When the two friction plates just contact the brake disc, namely the contact critical point, the brake clearance elimination is completed and the brake force following stage is started. In the braking force following stage, the torque motor 4 continues to rotate to drive the secondary planetary gear speed reduction and torque increase mechanism 11 to reduce the speed and increase the torque, and then the rotating motion is converted into the axial movement of the sleeve 2 through the ball screw 15 so as to deform the friction plate, and the clamping force between the friction plate and the brake disc is increased until the target clamping force is achieved. After the braking purpose is finished, the braking gap generation stage is entered. In the braking clearance generation stage, a driver sends an instruction, a central controller of the electronic mechanical brake transmits a signal to a torque motor controller to apply certain reverse voltage to the two ends of the motor 4, the torque motor reversely drives the secondary planetary gear speed reducing and torque increasing mechanism 11 to convert the rotary motion into the reverse axial movement of the sleeve 2 through the ball screw 15, so that the deformation of the friction plate is gradually reduced, and the brake block is gradually far away from the brake disc. When the friction plate is not in contact with the brake disc right, namely the friction plate is a separation critical point, the rotation of the motor is controlled through the time delay device, and therefore a certain brake clearance is guaranteed.
In summary, the gap adjusting and controlling apparatus of an electromechanical brake according to the present invention mainly includes: the brake comprises a brushless direct current torque motor, a secondary planetary gear speed reducing and torque increasing mechanism connected with the torque motor, a ball screw connected with the secondary planetary gear speed reducing and torque increasing mechanism, a sleeve in threaded connection with a ball screw bolt, brake blocks respectively attached to the sleeve and an inlay, a friction plate fixed on the brake blocks, a guide pin fixed in the middle of the inlay, and a brake disc positioned between the two brake blocks; the gap regulation and control method mainly comprises the following steps: the method comprises the following steps: when a driver sends a braking instruction, the central controller of the electronic mechanical brake applies forward voltage to the torque motor through the motor controller to enable the motor to rotate forward to eliminate the braking gap, and the braking force following stage is started after the elimination of the braking gap is completed. Step two: after the electromechanical brake completes the braking in the braking force following stage, the central controller of the electromechanical brake applies reverse voltage to the torque motor via the motor controller to reverse the motor for generating braking gap. Step three: and controlling the motor to generate a certain brake clearance in the brake clearance generation stage. The clearance regulating and controlling method of the electronic mechanical brake respectively identifies the contact and separation critical points of the brake friction plate and the brake disc by utilizing the change signals of the rotating speed and the current of the motor, and solves the problems of increased cost, increased installation space and complex structure caused by adding various sensors.
Claims (5)
1. A clearance regulating and controlling device of an electronic mechanical brake is characterized by comprising a torque motor (4), a secondary planetary gear speed reducing and torque increasing mechanism (11) connected with the torque motor (4), a ball screw (15) connected with the secondary planetary gear speed reducing and torque increasing mechanism (11), a sleeve (2) in threaded connection with the ball screw (15) through a bolt, a first brake block (16) and a second brake block (20) respectively attached to the sleeve (2) and an inlay (1), a first friction plate (17) and a second friction plate (19) respectively fixed on the first brake block (16) and the second brake block (20), a guide pin (5) fixed in the middle of the inlay, and a brake disc (18) positioned between the two brake blocks;
and (3) braking process: the torque motor (4) positively rotates to drive the secondary planetary gear speed-reducing and torque-increasing mechanism (11), the secondary planetary gear speed-reducing and torque-increasing mechanism (11) converts the rotary motion into the axial movement of the sleeve (2) through the ball screw (15), and drives the first friction plate (17) and the second friction plate (19) to axially move to press the brake disc (18);
and (3) a release process: the torque motor (4) reversely rotates to drive the secondary planetary gear speed-reducing and torque-increasing mechanism (11), the secondary planetary gear speed-reducing and torque-increasing mechanism (11) converts the rotary motion into the axial reverse movement of the sleeve (2) through the ball screw (15), and drives the first friction plate (17) and the second friction plate (19) to release the brake disc (18).
2. The gap adjusting and controlling device of the electronic mechanical brake as claimed in claim 1, wherein the secondary planetary gear speed reducing and torque increasing mechanism (11) comprises a primary planetary gear (7), a primary gear ring (8), a primary central gear (6), a primary planet carrier (13), a secondary planetary gear (9), a secondary gear ring (10), a secondary central gear (14) and a secondary planet carrier (12); the torque motor (4) drives the primary central wheel (6) to rotate, the primary central wheel (6) drives the primary planet wheel (7) to rotate along the primary gear ring (8) through gear transmission, the primary planet wheel rotates and transmits motion to the secondary central wheel (14) through the primary planet carrier (13), and the secondary central wheel transmits motion to the secondary planet carrier (12) through the secondary planet wheel (9) along the secondary gear ring (10); the secondary planet carrier drives the ball screw (15) to convert the rotary motion into the axial movement of the sleeve (2) through the screw bolt (3).
3. A clearance regulating method of an electronic mechanical brake is characterized by comprising the following steps:
s1, when the driver steps on the brake pedal, the brake signal is transmitted to the central controller of the electronic mechanical brake, the central controller sends a brake instruction to the motor controller to apply positive voltage to the torque motor (4) to drive the torque motor to rotate positively;
s2, the motor rotates positively to drive the two-stage planetary gear speed reducing and torque increasing mechanism (11) to reduce and increase torque, and then the rotating motion transmitted by the speed reducing and torque increasing mechanism is converted into the axial movement of the sleeve (2) through the ball screw (15);
s3, the ball screw bolt (3) pushes the first brake block (16) and the second brake block (20) to press the brake disc (18) to eliminate the brake clearance through the thread transmission with the sleeve (2);
s4, in the process of eliminating the brake clearance, the rotating speed of the motor is continuously increased to the maximum value so as to eliminate the brake clearance as soon as possible, when the first friction plate (17) and the second friction plate (19) are contacted with the brake disc (18), the elimination of the brake clearance is just completed, the rotating speed of the motor begins to suddenly decrease, and the electronic mechanical brake reads the rotating speed of the torque motor through a tachometer;
s5, when the starting point that the rotating speed of the torque motor (4) is suddenly reduced from the maximum value is detected, the contact critical point of the brake friction plate and the brake disc (18) is considered to be reached, namely the elimination of the brake clearance is just finished at the moment, and then the braking force following stage is started;
s6, in the braking force following stage, the rotating speed of the motor is sharply reduced to zero, the clamping force on the brake disc (18) reaches the maximum value at the moment, and the braking gap generating stage is started until the braking purpose is finished;
s7, in the stage of generating the braking clearance, the central controller of the electronic mechanical brake applies reverse voltage to the torque motor through the motor controller, the torque motor is driven to rotate reversely, the braking friction plate and the braking disc (18) start to separate, and the current of the motor is reduced continuously; the electronic mechanical brake controller transmits current change data of the torque motor through the current sensor;
and S8, when the controller of the electronic mechanical brake detects that the change rate of the current becomes zero for the first time, the brake friction plate and the brake disc (18) are considered to reach a separation critical point.
4. The method for controlling a clearance of an electromechanical brake of claim 3, wherein a tachometer, a current sensor, and a time delay device are provided in the controller of the electromechanical brake.
5. The method for regulating the clearance of the electromechanical brake as recited in claim 3, wherein the secondary planetary gear speed reduction and torque increase mechanism (11) comprises a primary planetary gear (7), a primary ring gear (8), a primary sun gear (6), a primary planet carrier (13), a secondary planetary gear (9), a secondary ring gear (10), a secondary sun gear (14), and a secondary planet carrier (12); the torque motor (4) drives the primary central wheel (6) to rotate, the primary central wheel (6) drives the primary planet wheel (7) to rotate along the primary gear ring (8) through gear transmission, the primary planet wheel rotates and transmits motion to the secondary central wheel (14) through the primary planet carrier (13), and the secondary central wheel transmits motion to the secondary planet carrier (12) through the secondary planet wheel (9) along the secondary gear ring (10); the secondary planet carrier drives the ball screw (15) to convert the rotary motion into the axial movement of the sleeve (2) through the screw bolt (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110538685.5A CN113389825A (en) | 2021-05-18 | 2021-05-18 | Gap regulation and control device and method for electronic mechanical brake |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110538685.5A CN113389825A (en) | 2021-05-18 | 2021-05-18 | Gap regulation and control device and method for electronic mechanical brake |
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| CN202110538685.5A Pending CN113389825A (en) | 2021-05-18 | 2021-05-18 | Gap regulation and control device and method for electronic mechanical brake |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087302A (en) * | 2021-10-19 | 2022-02-25 | 中国科学院电工研究所 | Configuration control method and control system for electronic mechanical brake linear control system |
| CN114233776A (en) * | 2021-12-27 | 2022-03-25 | 江苏大学 | Novel automotive electronic mechanical brake |
| CN114826028A (en) * | 2022-03-31 | 2022-07-29 | 武汉步锐科汽车工业科技有限责任公司 | Motor control method and device for EMB braking, storage medium and electronic equipment |
| WO2023246136A1 (en) * | 2022-06-22 | 2023-12-28 | 中国科学院电工研究所 | Electro-mechanical braking mechanism |
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| JP2003287066A (en) * | 2002-03-29 | 2003-10-10 | Nissin Kogyo Co Ltd | Electric disk brake |
| CN105438157A (en) * | 2016-01-07 | 2016-03-30 | 西华大学 | Electronic mechanical braking system |
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| CN114087302A (en) * | 2021-10-19 | 2022-02-25 | 中国科学院电工研究所 | Configuration control method and control system for electronic mechanical brake linear control system |
| CN114087302B (en) * | 2021-10-19 | 2024-02-27 | 中国科学院电工研究所 | Control method and control system for configuration of electronic mechanical brake line control system |
| CN114233776A (en) * | 2021-12-27 | 2022-03-25 | 江苏大学 | Novel automotive electronic mechanical brake |
| CN114233776B (en) * | 2021-12-27 | 2024-04-26 | 江苏大学 | Novel automobile electronic mechanical brake |
| CN114826028A (en) * | 2022-03-31 | 2022-07-29 | 武汉步锐科汽车工业科技有限责任公司 | Motor control method and device for EMB braking, storage medium and electronic equipment |
| CN114826028B (en) * | 2022-03-31 | 2024-05-17 | 武汉步锐科汽车工业科技有限责任公司 | Motor control method and device for EMB braking, storage medium and electronic equipment |
| WO2023246136A1 (en) * | 2022-06-22 | 2023-12-28 | 中国科学院电工研究所 | Electro-mechanical braking mechanism |
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