CN109649363B - Electromechanical hydraulic brake, brake control method and electronic hydraulic line control brake system - Google Patents
Electromechanical hydraulic brake, brake control method and electronic hydraulic line control brake system Download PDFInfo
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- CN109649363B CN109649363B CN201910042628.0A CN201910042628A CN109649363B CN 109649363 B CN109649363 B CN 109649363B CN 201910042628 A CN201910042628 A CN 201910042628A CN 109649363 B CN109649363 B CN 109649363B
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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
- B60T13/10—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 fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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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
- B60T13/10—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 fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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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
- B60T13/745—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 a hydraulic system, e.g. a master cylinder
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention discloses an electronic mechanical hydraulic brake, a brake control method and an electronic hydraulic line control brake system, wherein a brake wheel cylinder assembly is additionally arranged on the basis of a planetary gear train assembly and a ball screw pair assembly of the original electronic mechanical brake, power is output by a motor and then sequentially transmitted to a brake wheel cylinder body through the planetary gear train assembly and the ball screw pair assembly, the brake wheel cylinder body is driven to move forwards and backwards, so that the brake pressure is increased or the brake is released, in addition, a hydraulic cavity of the brake wheel cylinder body is connected with an external hydraulic brake system through a normally open electromagnetic valve, when the brake motor fails in power failure, the hydraulic cavity is communicated with a brake master cylinder of the brake system through opening the normally open electromagnetic valve, so that the hydraulic oil is input into the hydraulic cavity to drive the brake wheel cylinder body to move, and the pressure increasing brake under the failure of power failure is realized. The invention adopts two braking modes of motor drive braking and braking wheel cylinder hydraulic braking, and can realize brake-by-wire braking and failure braking of a braking system.
Description
Technical Field
The invention belongs to the technical field of automobile brake-by-wire, and particularly relates to an electronic mechanical hydraulic brake, a brake control method and an electronic hydraulic brake-by-wire system.
Background
With the development of the current energy saving and new energy automobile technology, people put higher demands on integration and electrification of vehicles. Currently, most fuel vehicles and some new energy vehicles still use conventional braking systems. The traditional braking system adopts a vacuum booster, a pump motor, an energy accumulator pump and the like, and has certain complexity when hydraulic pipelines are arranged, so that the linear control braking system which is integrated and electrified to a higher degree and has better safety is adopted for energy-saving and new energy vehicles.
At present, a wire control hydraulic braking system and a wire control electronic mechanical braking system not only have better integration level, but also have higher electrification degree. However, the brake-by-wire system still needs more hydraulic pipelines in arrangement, for example, a 'dual-rotor motor brake-by-wire system' disclosed in the patent with the application number of 201710432366X, the brake system works to generate braking force completely by hydraulic pressure, hydraulic pipelines are adopted to connect all parts, and the brake system has certain complexity in arrangement, but can still realize certain braking force through a brake pedal when the brake system of the vehicle fails in power failure; the brake-by-wire electromechanical brake system is simple in arrangement because a hydraulic pipeline is not required to be arranged, but the vehicle cannot be guaranteed to have certain braking capability when the brake system fails due to power failure. For example, "an electromechanical brake" disclosed in chinese patent application No. 201810596443X, when applied in a brake control system of a vehicle, if the vehicle brake system fails in a power failure, wheels employing the electromechanical brake cannot maintain a certain braking force, which affects the safety of the vehicle. The ball screw type electromechanical brake disclosed in the 2017104142310 patent also fails to ensure that the wheels employing the brake maintain a certain braking force when the vehicle brake system fails in a power failure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses an electromechanical hydraulic brake, a brake control method and a vehicle brake control system. The technical scheme of the invention is as follows:
the electromechanical hydraulic brake consists of a box body assembly, a motor, a planetary gear train assembly, a ball screw pair assembly, friction linings and a brake disc, wherein a sun gear shaft is coaxially connected with an output shaft of the motor, a gear ring is fixedly connected with the box body assembly, a planet carrier is coaxially connected with a ball screw of the ball screw pair assembly, and the electromechanical hydraulic brake further comprises a brake wheel cylinder assembly;
the brake cylinder assembly consists of a brake cylinder body 21 and a piston 18, wherein an opening of the brake cylinder body 21 faces the ball screw assembly, the outer edge of the brake cylinder body 21 is fixedly connected with a ball screw nut 13 in the ball screw assembly, the piston 18 forms a hydraulic cavity 51 in the brake cylinder body 21 and the bottom of the brake cylinder body 21, and the hydraulic cavity 51 is connected with an external hydraulic system pipeline through a brake fluid inlet and outlet 52 formed in the brake cylinder body 21;
the friction linings are correspondingly arranged on the outer end face of the brake cylinder body 21 and the box body assembly at the front end of the brake cylinder body 21, the brake disc is arranged between the two friction linings, and the compression or the release between the friction linings and the brake disc is controlled through the linear motion of the brake cylinder body 21, so that the increase or the decrease of the braking force of the brake is realized.
Further the planetary gear train assembly consists of a gear ring 32, a planet wheel 33, a sun gear shaft 8 and a planet carrier;
one end of the sun gear shaft 8 is coaxially connected with the output shaft of the motor 1, and the other end of the sun gear shaft is coaxially and rotatably arranged in the planet carrier through a bearing;
the three planetary gears 33 are respectively arranged on planetary gear shafts at the end parts of the planetary carriers, the outer sides of the planetary gears 33 are meshed with the gear rings 32, and the inner sides of the planetary gears 33 are meshed with the sun gear shafts 8;
the outer side of the shaft end of the planet carrier is rotatably arranged at the inner side of the box body assembly through a bearing, and one end of a ball screw of the ball screw assembly is coaxially connected at the inner side of the shaft end of the planet carrier through a key.
The ball screw assembly is formed by matching and connecting a ball screw 15 and a ball screw nut 13;
the ball screw nut 13 is matched with the ball screw 15 through the ball 14 to form a ball screw transmission pair, protrusions are uniformly arranged on the outer circumference of the ball screw nut 13 and matched with an axial sliding groove formed in the inner wall of the box body assembly, and the ball screw nut 13 moves back and forth in the box body assembly along the axial sliding groove under the driving of the ball screw 15.
Further, a lubricant oil filling port 27 is opened in a side wall of the ball screw nut 13.
A brake control method of an electro-mechanical hydraulic brake, the brake control method comprising a brake control method in an energized active state and a brake control method in a de-energized inactive state;
the specific control process of the braking control method in the electrified effective state is as follows:
the motor 1 is electrified to run to drive the planetary gear train assembly to run, the sun gear shaft 8 synchronously rotates under the drive of the motor 1, the sun gear shaft 8 drives the planet gears 33 meshed with the sun gear shaft 8 to run, the planet carrier is further driven to rotate and output power to the ball screw assembly, the planet carrier is rotated to drive the ball screw assembly to run, the ball screw 15 synchronously rotates under the drive of the planet carrier, the ball screw nut 13 moves along the axial straight line, the brake cylinder body 21 moves along the axial straight line synchronously under the drive of the ball screw nut 13, the forward rotation or the reverse rotation of the planet carrier at the output end of the planetary gear train assembly is controlled by controlling the output shaft of the motor 1, the ball screw nut 13 at the output end of the ball screw assembly is further controlled to move forward or backward along the axial direction, and finally the brake cylinder body 21 in the brake cylinder assembly is controlled to move forward or backward along the axial direction, and the friction lining 19 and the brake disc 20 arranged between the brake cylinder body 21 and the box III 16 are compressed to realize the pressure boost or the brake release to realize the pressure reduction of the brake;
in the braking control process under the effective state of energization, the hydraulic chamber 51 of the brake cylinder body 21 is filled with brake fluid, and the brake fluid inlet and outlet 52 is controlled by switching on and off the normally open electromagnetic valve of the brake system, so that the brake fluid is blocked from the outside, and no brake fluid flows between the hydraulic chamber 51 and the outside.
The specific control process of the braking control method under the power failure state is as follows:
the motor 1 is powered off and has no power output, a normally open electromagnetic valve connected with a hydraulic cavity 51 of the brake cylinder body 21 in a brake system where the electromechanical hydraulic brake is located is powered off and opened, brake fluid flows into the hydraulic cavity 51 through a brake fluid inlet and outlet 52, the piston 18 moves backwards under the pressure action of the brake fluid and overcomes the gap between the piston 18 and the end face of the ball screw 15, the brake fluid is continuously injected into the hydraulic cavity 51, the brake cylinder body 21 moves forwards under the action of brake fluid pressure, and the friction lining 19 arranged between the brake cylinder body 21 and the third box body 16 is compressed with the brake disc 20 to compress the brake, so that the brake is in failure braking.
An electronic hydraulic line control braking system comprises a brake master cylinder assembly, a pedal feel simulation assembly, an oil storage cup, an electronic control unit ECU, a brake control valve assembly and a brake, wherein the brake control valve assembly comprises five normally-open electromagnetic valves and a second normally-closed electromagnetic valve 45, one side of a first normally-open electromagnetic valve 44 is connected with a brake master cylinder shell 36, the other side of the first normally-open electromagnetic valve 44 is respectively connected with one side of a second normally-open electromagnetic valve 46, a third normally-open electromagnetic valve 47, a fourth normally-open electromagnetic valve 48 and a fifth normally-open electromagnetic valve 49, one side of the second normally-closed electromagnetic valve 45 is connected with the oil storage cup 42, and the other side of the second normally-closed electromagnetic valve 45 is respectively connected with one sides of the second normally-open electromagnetic valve 46, the third normally-open electromagnetic valve 47, the fourth normally-open electromagnetic valve 48 and the fifth normally-open electromagnetic valve 49;
the other side of the first normally open electromagnetic valve 44 is also connected with the other side pipeline of the second normally closed electromagnetic valve 45, and redundant brake fluid in the brake master cylinder can flow back to the oil storage cup 42 through the first normally open electromagnetic valve 44 and the second normally closed electromagnetic valve 45 in sequence;
four of the brakes are respectively the electromechanical hydraulic brake described in the claim 1;
the other sides of the second normally open electromagnetic valve 46, the third normally open electromagnetic valve 47, the fourth normally open electromagnetic valve 48 and the fifth normally open electromagnetic valve 49 are respectively connected with a brake fluid inlet and outlet 52 of the corresponding electro-mechanical hydraulic brake through pipelines;
each electromagnetic valve in the brake control valve assembly and the motor 1 of the electro-mechanical hydraulic brake are respectively connected with an electronic control unit ECU43 in an electric signal mode.
The invention has the beneficial effects that with the combination of the specification and the drawings, the invention has the following advantages:
1. the electromechanical hydraulic brake adopts two braking modes of motor drive braking and braking wheel cylinder hydraulic braking, and can realize brake-by-wire and failure braking when a vehicle braking system fails.
2. The electromechanical hydraulic brake adopts the transmission form of the planetary gear and the ball screw pair, realizes the change of the rotation speed and torque reduction and movement form of motor output, has compact structure and is easy to operate.
3. The electromechanical hydraulic brake adopts the form that the ball screw nut is connected with the cylinder body of the brake wheel cylinder body, thereby realizing motor-driven braking.
4. The electromechanical hydraulic brake is provided with the brake wheel cylinder hydraulic cavity, so that failure braking under the failure of a brake motor or the failure of a brake system is realized, and the running safety of a vehicle is ensured.
5. Compared with the traditional brake-by-wire system, the vehicle brake control system provided by the invention has the advantages of simple hydraulic pipeline arrangement, high electrification degree and the like, and meanwhile, the system can realize active pressure building, accurate pressure control and full decoupling of pedal force and braking force.
Drawings
FIG. 1 is a schematic view of the internal structure of an electro-mechanical hydraulic brake according to the present invention;
FIG. 2 is a schematic diagram of a planetary gear train in the electro-mechanical hydraulic brake according to the present invention;
FIG. 3a is a full cross-sectional view of a ring gear in an electro-mechanical hydraulic brake according to the present invention;
FIG. 3b is a left side view of the ring gear in the electro-mechanical hydraulic brake of the present invention;
FIG. 3c is a cross-sectional view AA in FIG. 3 a;
FIG. 4a is a full cross-sectional view of a planetary gear in an electro-mechanical hydraulic brake according to the present invention;
FIG. 4b is a left side view of a planetary gear in the electro-mechanical hydraulic brake of the present invention;
FIG. 5a is a full cross-sectional view of a planet carrier in an electro-mechanical hydraulic brake according to the present invention;
FIG. 5b is a left side view of the planet carrier in the electro-mechanical hydraulic brake of the present invention;
FIG. 6a is a full cross-sectional view of a second planet carrier in the electro-mechanical hydraulic brake of the present invention;
FIG. 6b is a cross-sectional view BB in FIG. 6 a;
FIG. 7a is a front view of a ball screw in an electro-mechanical hydraulic brake according to the present invention;
FIG. 7b is a cross-sectional view of the CC of FIG. 7 a;
FIG. 8a is a partial cross-sectional view of a ball screw nut in an electro-mechanical hydraulic brake according to the present invention;
FIG. 8b is a cross-sectional view DD in FIG. 8 a;
FIG. 9 is a full cross-sectional view of a piston in the electro-mechanical hydraulic brake of the present invention;
FIG. 10a is a full cross-sectional view of a brake cylinder housing in an electro-mechanical hydraulic brake according to the present invention;
FIG. 10b is a left side view of a brake cylinder housing in an electro-mechanical hydraulic brake according to the present invention;
FIG. 11a is a full cross-sectional view of a housing in an electro-mechanical hydraulic brake according to the present invention;
FIG. 11b is a left side view of the housing in the electro-mechanical hydraulic brake of the present invention;
FIG. 12a is a second full cross-sectional view of the housing in the electro-mechanical hydraulic brake of the present invention;
FIG. 12b is a left side view of the housing in the electro-mechanical hydraulic brake of the present invention;
FIG. 12c is a cross-sectional view of EE in FIG. 12 a;
FIG. 13a is a three-part cross-sectional view of a housing in an electro-mechanical hydraulic brake according to the present invention;
FIG. 13b is a three left side view of the housing in the electro-mechanical hydraulic brake of the present invention;
FIG. 14 is a schematic diagram of a vehicle brake control system according to the present invention;
in the figure:
a motor 1, a box body 2, a planet carrier 3, a screw 4,
a 5 bearing bush, a 6 planet carrier II, a 7 deep groove ball bearing, an 8 sun gear shaft,
9 a second box body, 10a flat key, 11a tapered roller bearing, 12a bushing,
13 ball screw nuts, 14 balls, 15 ball screw rods, 16 box bodies three,
17 sealing rings, 18 pistons, 19 friction linings, 20 brake discs,
21 brake cylinder body, 22 rectangular sealing ring, 23 screw two, 24 bolts,
25 gaskets, 26 nuts, 27 lubricating oil filling ports, 28 screws III,
29 sleeve, 30 screw four, 31 screw five, 32 gear ring,
33 planetary gears, 34 brake pedal, 35 pedal push rod, 36 brake master cylinder housing,
37 pedal feel simulator, 38 master cylinder piston, 39 first normally closed solenoid valve, 40 master cylinder return spring,
41 one-way valve, 42 oil storage cup, 43 electronic control unit, 44 first normally open solenoid valve,
45 a second normally closed solenoid valve, 46 a second normally open solenoid valve, 47 a third normally open solenoid valve, 48 a fourth normally open solenoid valve,
49 fifth opening solenoid valve, 50 pedal position sensor, 51 hydraulic pressure chamber, 52 brake fluid inlet and outlet.
Detailed Description
In order to further explain the technical scheme and the specific working process of the invention, the specific embodiment of the invention is as follows in combination with the attached drawings in the specification:
as shown in fig. 1, the invention discloses an electromechanical hydraulic brake, which consists of a motor, a planetary gear train assembly, a ball screw assembly, a brake cylinder assembly, a box body assembly, friction linings and a brake disc; the motor, the planetary gear train assembly, the ball screw assembly and the brake wheel cylinder assembly are sequentially arranged from back to front, an output shaft of the motor 1 is coaxially connected with a sun gear shaft 8 of the planetary gear train assembly, a planet carrier of the planetary gear train assembly is coaxially connected with a ball screw 15 of the ball screw assembly, a brake wheel cylinder body 21 of the brake wheel cylinder assembly is fixedly connected with a ball screw nut 13 of the ball screw assembly, the tail end of the ball screw 15 of the ball screw assembly is contacted with a piston 18 of the brake wheel cylinder assembly, the motor 1 is arranged on the outer side of the box assembly, the planetary gear train assembly, the ball screw assembly and the brake wheel cylinder assembly are all arranged in the box assembly, the motor 1 drives the planetary gear train assembly to transmit motion to the ball screw assembly, and finally the ball screw assembly drives the brake wheel cylinder assembly to brake or release braking of a brake.
The box body assembly is formed by sequentially connecting a first box body 2, a second box body 9 and a third box body 16 from back to front. As shown in fig. 11a and 11b, the first box body 2 is disc-shaped, six stepped holes are uniformly formed on the outer side of the circumference of the end face of the first box body 2, four connecting holes are uniformly formed on the inner side of the circumference of the end face of the first box body 2, and a center hole is formed in the center of the first box body 2; as shown in fig. 12a, fig. 12b and fig. 12c, the front end face and the rear end face of the second box body 9 are respectively provided with a circle of outer edges, six stepped holes are uniformly formed in the outer edges of the two ends of the second box body 9 along the circumferential direction, the inner side of the second box body 9 is provided with a stepped shaft hole, and four axial sliding grooves are uniformly formed in the inner circumferential surface of the shaft hole of the front end of the second box body 9; as shown in fig. 13a and 13b, the rear end of the third box 16 is provided with a circle of outer edge, six stepped holes are uniformly formed in the circumferential direction on the outer edge of the rear end of the third box 16, the stepped holes on the rear end surface of the third box 16 correspond to the stepped holes on the front end surface of the second box 9, the third box 16 is fixedly connected with the second box 9 through six groups of connecting pieces consisting of bolts 24, gaskets 25 and nuts 26, the middle section of the third box 16 is provided with a central hole, the inner circumferential surface of the middle section of the third box 16 is provided with a circle of sealing groove, and the rear side surface of the front end of the third box 16 is provided with threaded blind holes for mounting the friction lining 19 on the third box 16 through screws.
The motor 1 is axially arranged at the rear end of the first box body 2, four threaded holes are uniformly formed in the end face of the motor 1 shell along the circumferential direction, the threaded holes in the end face of the motor 1 shell correspond to the connecting through holes in the end face of the first box body 2, the motor 1 shell is fixedly arranged on the first box body 2 through four screws five 31, and the axis of an output shaft of the motor 1 is collinear with the axis of a central hole of the first box body 2.
The planetary gear train assembly consists of a gear ring 32, a planet wheel 33, a sun gear shaft 8 and a planet carrier; as shown in fig. 3a, 3b and 3c, the gear ring 32 is sleeve-shaped, a circle of straight teeth is arranged on the inner circumferential surface of the gear ring 32, a circle of inner edges are respectively arranged on the front end surface and the rear end surface of the gear ring 32, six threaded holes are uniformly formed in the circumferential direction on the inner edges of the two ends of the gear ring 32, the threaded holes on the rear end surface of the gear ring 32 correspond to the stepped holes on the end surface of the first box body 2, the gear ring 32 is fixedly connected with the first box body 2 through six screws four 30, the threaded holes on the front end surface of the gear ring 32 correspond to the stepped holes on the rear end surface of the second box body 9, and the gear ring 32 is fixedly connected with the second box body 9 through six screws three 28; the planet carrier is formed by combining a planet carrier I3 and a planet carrier II 6, as shown in fig. 5a and 5b, the planet carrier I3 is in a circular plate shape, three stepped holes are uniformly formed in the end face of the planet carrier I3 along the circumferential direction, a center hole is formed in the circle center of the planet carrier I3, as shown in fig. 6a and 6b, a stepped shaft hole is formed in the inner side of the planet carrier II 6, a key slot is formed in the inner circumferential surface of the shaft hole at the front end of the planet carrier II 6, three planet shafts are uniformly arranged in the circumferential direction on a planet carrier supporting plate at the rear end of the planet carrier II 6, a threaded hole in the planet shaft at the rear end of the planet carrier II 6 corresponds to the stepped hole in the end face of the planet carrier I3, a section of planet carrier shaft is arranged at the front end of the planet carrier II 6, the planet carrier shaft is mounted in a matched manner with the rear end shaft hole of the box II 9 through a pair of tapered roller bearings 11, the bearing outer ring of the tapered roller bearings 11 are in interference fit with the rear end shaft hole of the box II 9, and the planet carrier II bearing is in interference fit with the planet carrier II bearing 6; as shown in fig. 2, fig. 4a and fig. 4b, the number of the planetary gears 33 is three, the three planetary gears 33 are respectively sleeved on three planetary gear shafts of the planetary gear frame two 6 through the bearing bushes 5 in a rotating way, the outer sides of the three planetary gears 33 are respectively meshed with straight teeth on the inner circumferential surface of the gear ring 32, after the planetary gears 33 are sleeved on the planetary gear shafts, the planetary gear frame one 3 is fixed on the planetary gear shaft end surfaces of the planetary gear frame two 6 through three screws one 4, and the axial limit of the planetary gears 33 is realized; one end of the sun gear shaft 8 passes through the central holes of the first planet carrier 3 and the first box 2 respectively and is coaxially connected with the output shaft of the motor 1, the other end of the sun gear shaft 8 is matched with the shaft hole at the rear end of the second planet carrier 6 through transition fit with the deep groove ball bearing 7, the outer circumferential surface of the middle section of the sun gear shaft 8 is provided with a circle of gear teeth and is meshed and connected with the inner sides of the three planet gears 33, and a sleeve 29 is sleeved between the rear end face of the bearing inner ring of the deep groove ball bearing 7 and the front end face of the shaft shoulder of the middle section of the sun gear shaft 8 so as to ensure coaxiality between the sun gear shaft 8 and the deep groove ball bearing 7.
The ball screw assembly is formed by matching and connecting a ball screw 15 and a ball screw nut 13; as shown in fig. 7a and 7b, the front section of the ball screw 15 is a threaded shaft section, the rear section of the ball screw 15 is an optical axis section with a key slot, the optical axis section of the ball screw 15 is coaxially connected with the shaft hole at the front end of the second planet carrier 6 through the flat key 10, the optical axis of the ball screw 15 is in interference fit with the flat key 10, the shaft hole at the front end of the second planet carrier 6 is in clearance fit with the flat key 10, the threaded shaft section of the ball screw 15 is in fit connection with the ball screw nut 13 through the mounting ball 14 to form a ball screw transmission pair, and the tail end of the ball screw 15 extends into the brake cylinder 21 of the brake cylinder assembly to be opposite to the rear end face of the piston 18; as shown in fig. 8a and 8b, a circular sliding plate is disposed at the rear end of the ball screw nut 13, a bushing 12 is mounted between the rear end surface of the circular sliding plate of the ball screw nut 13 and the front end surface of the bearing inner ring of the tapered roller bearing 11 to prevent the ball screw nut 13 from generating motion interference to the tapered roller bearing 11, four rectangular protrusions are uniformly disposed on the outer circumferential surface of the circular sliding plate, the rectangular protrusions are matched with axial sliding grooves on the inner circumferential surface of the shaft hole at the front end of the second case 9, the rectangular protrusions slide axially forward and backward in the axial sliding grooves, the ball screw nut 13 does not rotate in the circumferential direction, an internal thread matched with the thread section of the ball screw 15 is formed on the inner circumferential surface of the ball screw nut 13, a circle of outer edge is disposed at the front end of the ball screw nut 13, six through holes are uniformly formed along the circumferential direction on the outer edge of the front end of the ball screw nut 13, and in addition, a lubricating oil filling port 27 is formed on the side wall of the circular sliding plate at the rear end of the ball screw nut 13, and lubricating oil is filled between the ball screw nut 13 and the ball screw 15.
The brake cylinder assembly consists of a brake cylinder body 21 and a piston 18; as shown in fig. 10a and 10b, six threaded holes are uniformly formed on the circumferential end surface of the open end of the brake cylinder body 21, the threaded holes at the open end of the brake cylinder body 21 correspond to the through holes on the front end surface of the ball screw nut 13, and the brake cylinder body 21 is fixedly connected with the ball screw nut 13 through a second screw 23; the piston 18 is installed in the brake cylinder body 21 in a matching manner, as shown in fig. 9, a circle of sealing groove with a rectangular end face is formed in the circumferential side wall of the piston 18, a rectangular sealing ring is installed between the sealing groove of the piston 18 and the side wall of the brake cylinder body 21, a hydraulic cavity 51 is formed between the front end face of the piston 18 and the brake cylinder body 21, a brake fluid inlet and outlet port 52 is formed in the side wall of the brake cylinder body 21 corresponding to the hydraulic cavity 51, a sealing ring 17 is installed between the outer circumferential side wall of the brake cylinder body 21 and the sealing groove in the middle section of the box body III 16, a threaded blind hole is formed in the outer side face of the front end of the brake cylinder body 21, friction linings 19 are installed and connected to the front end face of the brake cylinder body 21 through screws, friction linings 19 are also installed on the rear side face of the front end of the box III 16, and a brake disc 20 is arranged between the two friction linings 19.
Based on the composition structure of the electromechanical hydraulic brake, the invention also discloses a braking control method of the electromechanical hydraulic brake, wherein the braking control method comprises a braking control method in an electrified effective state and a braking control method in a power-off failure state.
1. The specific process of the brake control method in the energized state is as follows:
in the power-on effective state, the motor 1 is powered on to run, an output shaft of the motor 1 drives a planetary gear train assembly to run, in the planetary gear train assembly, a sun gear shaft 8 is driven by the output shaft of the motor 1 to synchronously rotate, gear teeth on the middle section of the sun gear shaft 8 drive three planetary gears 33 meshed with the sun gear shaft to run, and further drive a second planet carrier 6 to rotate and output power outwards, the planetary gear train assembly regulates the output rotating speed and the output torque of the motor 1, and high-rotating-speed and low-torque power output from the motor 1 is converted into low-rotating-speed and high-torque power through the planetary gear train assembly;
the second planet carrier 6 at the power output end of the planetary gear train assembly rotates and further drives the ball screw assembly to run, in the ball screw assembly, the ball screw 15 is driven by the second planet carrier 6 to synchronously rotate, and the ball screw nut 13 which is in matched connection with the threaded section of the ball screw 15 cannot rotate along the axial direction, so that the ball screw nut 13 moves along the axial direction linearly under the driving of the ball screw 15;
the ball screw nut 13 at the power output end of the ball screw assembly moves linearly along the axial direction to drive the brake cylinder assembly to move, and in the brake cylinder assembly, the brake cylinder body 21 moves synchronously and linearly along the axial direction under the drive of the ball screw nut 13;
the output shaft of the motor 1 is controlled to rotate forward or reversely to control the planet carrier II 6 at the output end of the planetary gear train assembly to rotate forward or reversely, so as to further control the ball screw nut 13 at the output end of the ball screw assembly to move forward or backward along the axial direction, finally control the brake cylinder body 21 in the brake cylinder assembly to move forward or backward along the axial direction, and compress the friction lining 19 and the brake disc 20 arranged between the brake cylinder body 21 and the box body III 16 to realize brake pressure increase or release to realize brake pressure reduction.
In the braking control process under the effective state of energization, the hydraulic chamber 51 of the brake cylinder body 21 is filled with brake fluid, and the brake fluid inlet and outlet 52 is controlled by switching on and off the normally open electromagnetic valve of the brake system, so that the brake fluid is blocked from the outside, and no brake fluid flows between the hydraulic chamber 51 and the outside.
2. The specific process of the brake control method in the power failure state is as follows:
in the state of failure in power failure, the motor 1 cannot operate, in the braking system where the electromechanical hydraulic brake is located, a normally open electromagnetic valve connected with a hydraulic cavity 51 of a brake cylinder body 21 is opened in a power failure mode, brake fluid flows into the hydraulic cavity 51 through a brake fluid inlet and outlet 52, a piston 18 moves backwards under the pressure action of the brake fluid and overcomes a gap between the piston 18 and the end face of a ball screw rod 15, the brake fluid is continuously injected into the hydraulic cavity 51, the brake cylinder body 21 moves forwards under the action of brake fluid pressure, and a friction lining 19 arranged between the brake cylinder body 21 and a box body III 16 is compressed with a brake disc 20 to carry out brake boosting, so that the brake failure braking is realized;
the brake cylinder body 21 moves forwards and drives the ball screw nut 13 to move forwards, and drives the ball screw 15 to rotate, and the ball screw 15 further drives the planetary gear train assembly to move without interference.
As shown in fig. 14, the present invention discloses an electronic hydraulic brake system composed of a master cylinder assembly, a pedal feel simulation assembly, an oil reservoir cup, an electronic control unit ECU, a brake control valve assembly, and a brake.
The brake master cylinder assembly is comprised of a brake pedal 34, a pedal push rod 35, a brake master cylinder housing 36, a master cylinder piston 38, a brake master cylinder return spring 40, and a pedal position sensor 50. The brake pedal 34 is connected with a pedal push rod 35, a pedal position sensor 50 is arranged on the pedal push rod 35, the main cylinder piston 38 is positioned in the brake main cylinder shell 36, the pedal push rod 35 is connected with the rear end face of the main cylinder piston 38, two ends of a brake main cylinder return spring 40 are respectively arranged on the front end face of the main cylinder piston 38 and the front end face of the brake main cylinder shell 36, and three oil ports are respectively formed in the brake main cylinder shell 36, namely a first oil port connected with a pedal feel simulation assembly pipeline, a second oil port connected with a braking force control valve assembly and a third oil port connected with an oil storage cup 42;
the pedal feel simulation assembly consists of a pedal feel simulator 37 and a first normally closed electromagnetic valve 39, wherein the pedal feel simulator 37 is connected with a first oil port of the brake master cylinder shell 36 through the first normally closed electromagnetic valve 39;
the oil storage cup 42 is connected with a third oil port of the brake master cylinder shell 36 through a one-way valve 41, the one-way valve 41 is arranged in a way that the oil storage cup 42 is conducted to the brake master cylinder shell 36 in a one-way manner, and when the liquid oil in the brake master cylinder is insufficient, the oil storage cup 42 supplements liquid to the brake master cylinder through the one-way valve 41;
the brake control valve assembly consists of five normally-open electromagnetic valves and a second normally-closed electromagnetic valve 45, wherein one side of the first normally-open electromagnetic valve 44 is connected with a second oil port of the brake master cylinder shell 36, the other side of the first normally-open electromagnetic valve 44 is respectively connected with one sides of a second normally-open electromagnetic valve 46, a third normally-open electromagnetic valve 47, a fourth normally-open electromagnetic valve 48 and a fifth normally-open electromagnetic valve 49, one side of the second normally-open electromagnetic valve 45 is connected with the oil storage cup 42, and the other side of the second normally-closed electromagnetic valve 45 is respectively connected with one sides of the second normally-open electromagnetic valve 46, the third normally-open electromagnetic valve 47, the fourth normally-open electromagnetic valve 48 and the fifth normally-open electromagnetic valve 49;
in addition, the other side of the first normally open electromagnetic valve 44 is connected with the other side of the second normally closed electromagnetic valve 45 through a pipeline, and when the brake fluid in the brake master cylinder is excessive, the excessive brake fluid in the brake master cylinder can flow back to the oil storage cup 42 through the first normally open electromagnetic valve 44 and the second normally closed electromagnetic valve 45 in sequence;
the four brakes are all electromechanical hydraulic brakes, the second normally open electromagnetic valve 46, the third normally open electromagnetic valve 47, the fourth normally open electromagnetic valve 48 and the fifth normally open electromagnetic valve 49 are respectively and correspondingly connected with one electromechanical hydraulic brake, and the other sides of the second normally open electromagnetic valve 46, the third normally open electromagnetic valve 47, the fourth normally open electromagnetic valve 48 and the fifth normally open electromagnetic valve 49 are respectively connected with brake liquid inlet and outlet 52 pipelines of the corresponding electromechanical hydraulic brakes;
the first normally open electromagnetic valve 44 is respectively communicated with the hydraulic cavities 51 of the four electromechanical hydraulic brakes through the coordination control of the second normally open electromagnetic valve 46, the third normally open electromagnetic valve 47, the fourth normally open electromagnetic valve 48 and the fifth normally open electromagnetic valve 49, so that when the braking system fails in a power failure or a motor failure, brake fluid in the brake master cylinder can enter the hydraulic cavities 51 of the electromechanical hydraulic brakes to carry out hydraulic braking; the hydraulic chambers 51 of the four electromechanical hydraulic brakes can be communicated with the oil storage cup 42 through the cooperation control of the second normally-closed electromagnetic valve 45, the second normally-open electromagnetic valve 46, the third normally-open electromagnetic valve 47, the fourth normally-open electromagnetic valve 48 and the fifth normally-open electromagnetic valve 49, so that the brake fluid in the hydraulic chambers 51 of the electromechanical hydraulic brakes is ensured to always keep reasonable capacity.
The pedal position sensor 50, the first normally closed solenoid valve 39, the second normally closed solenoid valve 45, the first normally open solenoid valve 44, the second normally open solenoid valve 46, the third normally open solenoid valve 47, the fourth normally open solenoid valve 48, the fifth normally open solenoid valve 49 and the motor 1 of the electro-mechanical hydraulic brake are electrically connected with the electronic control unit ECU43, respectively.
The braking control process of the electronic hydraulic line control braking system comprises a braking control process in an electrifying effective state and a braking control process in a small outage failure state.
1. The braking control process in the electrifying effective state is specifically as follows:
1. a conventional braking process;
the pressurizing process comprises the following steps:
as shown in fig. 14, when the driver steps on the brake pedal 34, the electronic control unit ECU43 controls the first normally-closed solenoid valve 39 to be energized and open, and the pedal feel simulator 37 simulates a brake pedal feel, and the electronic control unit ECU43 controls the second normally-closed solenoid valve 45 to be deenergized and closed, and the first normally-open solenoid valve 44, the second normally-open solenoid valve 46, the third normally-open solenoid valve 47, the fourth normally-open solenoid valve 48 and the fifth normally-open solenoid valve 49 are energized and closed; the electronic control unit ECU43 judges the braking intention of the driver according to the pedal position change signal detected by the pedal position sensor 50, and simultaneously the electronic control unit ECU43 outputs a control signal outwards to control the motor 1 of the electro-mechanical hydraulic brake to electrify and rotate positively, and the electro-mechanical hydraulic brake works according to the braking control process in the electrifying effective state, so that each electro-mechanical hydraulic brake of the braking system carries out supercharging braking, and the braking of the vehicle is realized; during the pressurization process described above, the pedal force is fully decoupled from the braking force generated by the brake.
And (3) pressure maintaining:
when the electro-mechanical hydraulic brakes are completed to brake and boost, the electronic control unit ECU43 controls the motors 1 of the respective electro-mechanical hydraulic brakes to maintain constant current, so that the motors 1 maintain a fixed output torque, thereby realizing pressure maintenance of the electro-hydraulic brake system.
Decompression process:
when the electro-hydraulic brake system needs to reduce braking force, the ECU43 controls the motor 1 of the electro-mechanical hydraulic brake to reverse rotation, and the electro-mechanical hydraulic brake operates according to the braking control process in the aforementioned energized active state, so that each electro-mechanical hydraulic brake of the brake system performs braking decompression, thereby realizing decompression of the electro-hydraulic brake system.
2. An ABS braking process;
the pressurizing process comprises the following steps:
in the ABS braking process, the boosting braking process of the electronic hydraulic line control braking system is consistent with the boosting braking process during the conventional braking.
And (3) pressure maintaining:
in the ABS braking process, the pressure maintaining process of the electronic hydraulic pressure control braking system is consistent with the pressure maintaining braking process during the conventional braking.
Decompression process:
when the electronic control unit ECU43 detects that a certain wheel of the vehicle is locked, the electronic control unit ECU43 controls the motor 1 of the electro-mechanical hydraulic brake corresponding to the locked wheel to rotate reversely, so as to realize the decompression of the electro-mechanical hydraulic brake corresponding to the wheel; if a plurality of wheels need to be subjected to brake pressure reduction at the same time, the control process is identical to the single wheel pressure reduction control process, and can be realized by the control of the electronic control unit ECU 43.
3. The TCS and ESP braking control processes are substantially identical to the ABS braking process and are not described in detail herein.
4. Failure braking
Failure of the brake motor:
when one or more motors in the electro-hydraulic brake system fail, so that the electro-mechanical hydraulic brake cannot brake and boost or decompress, the electronic control unit ECU43 controls the first normally closed electromagnetic valve 39 and the second normally closed electromagnetic valve 45 to be powered off and closed, the electronic control unit ECU43 controls the normally open electromagnetic valve correspondingly connected with the brake fluid inlet and outlet ports 52 of the electro-mechanical hydraulic brake with the failure motor to be powered off and opened, a driver steps on the brake pedal 34, liquid in the brake master cylinder enters the brake wheel cylinder hydraulic cavity 51 of the failure brake, and the electro-mechanical hydraulic brake works according to the brake control process in the power failure state, so that the electro-mechanical hydraulic brake with the failure motor performs boost braking, and therefore failure braking of the electro-mechanical hydraulic brake under the condition of motor failure is realized;
failure of the brake system in power failure:
when the whole electronic hydraulic line control braking system fails in power failure, all normally-open electromagnetic valves in the system are in a power failure opening state, all normally-closed electromagnetic valves in the system are in a power failure opening state, motors of the electronic mechanical hydraulic brakes corresponding to the four wheels cannot work at the moment, in this case, a driver steps on the brake pedal 34, brake fluid in the brake master cylinder enters the hydraulic cavity 51 of the corresponding electronic mechanical hydraulic brake through the normally-open electromagnetic valves respectively, and all the electronic mechanical hydraulic brakes work according to the brake control process in the power failure state, so that all the electronic mechanical hydraulic brakes perform boosting braking, and the failure braking under the power failure condition of the whole electronic hydraulic line control braking system is realized.
Claims (4)
1. The braking control method of the electromechanical hydraulic brake is applied to the electromechanical hydraulic brake and consists of a box body assembly, a motor, a planetary gear train assembly, a ball screw pair assembly, a friction lining and a brake disc, wherein a sun gear shaft is coaxially connected with an output shaft of the motor, a gear ring is fixedly connected with the box body assembly, and a planet carrier is coaxially connected with a ball screw of the ball screw pair assembly;
the brake cylinder assembly is also included;
the brake cylinder assembly consists of a brake cylinder body (21) and a piston (18), an opening of the brake cylinder body (21) faces the ball screw assembly, the outer edge of the brake cylinder body (21) is fixedly connected with a ball screw nut (13) in the ball screw assembly, the piston (18) and the bottom of the brake cylinder body (21) form a hydraulic cavity (51) in the brake cylinder body (21), and the hydraulic cavity (51) is connected with an external hydraulic system through a brake fluid inlet and outlet (52) formed in the brake cylinder body (21);
the brake disc is arranged between the two friction linings, and the compression or release between the friction linings and the brake disc is controlled through the front-back linear motion of the brake cylinder body (21), so that the braking force of the brake is increased or reduced;
the planetary gear train assembly consists of a gear ring (32), a planet wheel (33), a sun gear shaft (8) and a planet carrier;
one end of the sun gear shaft (8) is coaxially connected with an output shaft of the motor (1), and the other end of the sun gear shaft is coaxially and rotatably arranged in the planet carrier through a bearing;
the three planetary gears (33) are respectively arranged on planetary gear shafts at the end parts of the planetary carriers, the outer sides of the planetary gears (33) are meshed with the gear rings (32), and the inner sides of the planetary gears (33) are meshed with the sun gear shafts (8);
the shaft end outside of planet carrier passes through the bearing rotation and installs in the box subassembly is inboard, the ball screw one end of ball screw pair subassembly passes through key coaxial coupling at the shaft end inboard of planet carrier, its characterized in that:
the braking control method comprises a braking control method in an electrifying effective state and a braking control method in a power-off failure state;
the specific control process of the braking control method in the electrified effective state is as follows:
the motor (1) is electrified to run to drive the planetary gear train assembly to run, the sun gear shaft (8) synchronously rotates under the drive of the motor (1), the sun gear shaft (8) drives the planet gears (33) meshed with the sun gear shaft to run, the planet carrier is further driven to rotate and output power to the ball screw assembly, the planet carrier is rotationally driven to the ball screw assembly to run, the ball screw (15) synchronously rotates under the drive of the planet carrier, the ball screw nut (13) moves along an axial straight line, the brake wheel cylinder body (21) synchronously moves along the axial straight line under the drive of the ball screw nut (13), the forward rotation or the reverse rotation of the planet carrier at the output end of the planetary gear train assembly is controlled through the control of the output shaft of the motor (1), the ball screw nut (13) at the output end of the ball screw assembly is further controlled to move forward or backward along the axial direction, and finally the brake cylinder body (21) in the brake assembly is controlled to move forward or backward along the axial direction, and the friction linings (19) arranged between the brake cylinder body (21) and the box body III (16) are compressed with the brake disc (20) to realize a brake, or a brake is released to realize a brake.
In the braking control process under the effective electrifying state, a hydraulic cavity (51) of the brake cylinder body (21) is filled with brake liquid, and a brake liquid inlet and outlet (52) is controlled by electrifying and disconnecting a normally open electromagnetic valve of a brake system to realize the separation from the outside, so that no brake liquid flows between the hydraulic cavity (51) and the outside;
the specific control process of the braking control method under the power failure state is as follows:
the motor (1) is powered off and has no power output, a normally open electromagnetic valve connected with a hydraulic cavity (51) of a brake cylinder body (21) in a brake system where the electromechanical hydraulic brake is located is powered off and opened, brake fluid flows into the hydraulic cavity (51) through a brake fluid inlet and outlet (52), a piston (18) moves backwards under the pressure action of the brake fluid and overcomes a gap between the piston and the end face of a ball screw (15), the brake fluid is continuously injected into the hydraulic cavity (51), the brake cylinder body (21) moves forwards under the action of brake fluid pressure, and a friction lining (19) arranged between the brake cylinder body (21) and a box body III (16) is compressed with a brake disc (20) to compress the brake, so that the brake is in failure braking.
2. A brake control method of an electro-mechanical hydraulic brake as set forth in claim 1, wherein:
the ball screw assembly is formed by matching and connecting a ball screw (15) and a ball screw nut (13);
the ball screw nut (13) is matched with the ball screw (15) through the balls (14) to form a ball screw transmission pair, protrusions are uniformly arranged on the outer circumference of the ball screw nut (13), the protrusions are matched with axial sliding grooves formed in the inner wall of the box body assembly, and the ball screw nut (13) moves back and forth in the box body assembly along the axial sliding grooves under the driving of the ball screw (15).
3. A brake control method of an electro-mechanical hydraulic brake as set forth in claim 2, wherein:
a lubricating oil filling port (27) is formed in the side wall of the ball screw nut (13).
4. An electronic hydraulic line control braking system comprises a brake master cylinder assembly, a pedal feel simulation assembly, an oil storage cup, an electronic control unit ECU, a brake control valve assembly and a brake, and is characterized in that:
the brake control valve assembly consists of five normally-open electromagnetic valves and a second normally-closed electromagnetic valve (45), wherein one side of a first normally-open electromagnetic valve (44) is connected with a brake master cylinder shell (36), the other side of the first normally-open electromagnetic valve (44) is respectively connected with one sides of a second normally-open electromagnetic valve (46), a third normally-open electromagnetic valve (47), a fourth normally-open electromagnetic valve (48) and a fifth normally-open electromagnetic valve (49), one side of the second normally-open electromagnetic valve (45) is connected with an oil storage cup (42), and the other side of the second normally-closed electromagnetic valve (45) is respectively connected with one sides of the second normally-open electromagnetic valve (46), the third normally-open electromagnetic valve (47), the fourth normally-open electromagnetic valve (48) and the fifth normally-open electromagnetic valve (49);
the other side of the first normally open electromagnetic valve (44) is connected with the other side of the second normally closed electromagnetic valve (45) through a pipeline, and redundant brake liquid in the brake master cylinder can flow back to the oil storage cup (42) through the first normally open electromagnetic valve (44) and the second normally closed electromagnetic valve (45) in sequence;
four of the brakes are respectively the electromechanical hydraulic brake described in the claim 1;
the other sides of the second normally open electromagnetic valve (46), the third normally open electromagnetic valve (47), the fourth normally open electromagnetic valve (48) and the fifth normally open electromagnetic valve (49) are respectively connected with brake fluid inlet and outlet (52) pipelines of the corresponding electromechanical hydraulic brake;
and each electromagnetic valve in the brake control valve assembly and a motor (1) of the electro-mechanical hydraulic brake are respectively connected with an electronic control unit ECU (43) in an electric signal mode.
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| CN201910042628.0A CN109649363B (en) | 2019-01-17 | 2019-01-17 | Electromechanical hydraulic brake, brake control method and electronic hydraulic line control brake system |
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| CN109649363B true CN109649363B (en) | 2023-10-13 |
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| CN112739929B (en) * | 2020-12-24 | 2022-05-31 | 华为技术有限公司 | Hydraulic device, braking system and braking control method |
| CN113511177A (en) * | 2021-08-09 | 2021-10-19 | 吉林东光奥威汽车制动系统有限公司 | Transmission device of electronic hydraulic brake boosting booster mechanism |
| CN114056306B (en) * | 2021-11-17 | 2023-04-07 | 苏州卡泰汽车科技有限公司 | Anti-lock braking system |
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