WO2023070635A1 - 一种制动系统、车辆及制动系统的控制方法 - Google Patents
一种制动系统、车辆及制动系统的控制方法 Download PDFInfo
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- WO2023070635A1 WO2023070635A1 PCT/CN2021/127788 CN2021127788W WO2023070635A1 WO 2023070635 A1 WO2023070635 A1 WO 2023070635A1 CN 2021127788 W CN2021127788 W CN 2021127788W WO 2023070635 A1 WO2023070635 A1 WO 2023070635A1
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- Prior art keywords
- vehicle
- parking
- piston
- brake
- move
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 54
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
-
- 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
- B60T13/58—Combined or convertible systems
- B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- 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
Definitions
- the present application relates to the technical field of vehicles, in particular to a braking system, a vehicle and a control method of the braking system.
- Parking brake methods generally include hand brakes and electronic parking (electrical park brake, EPB).
- the traditional handbrake is a cable type, and the user can transmit the parking force to the parking device by pulling the handbrake lever, and the pulling degree of the handbrake lever determines the magnitude of the parking force.
- the electronic parking brake is operated by pressing the button switch. By pressing and lifting the button, an instruction is sent to the control unit of the electronic parking device, and the control unit controls the brake caliper to apply parking to the brake disc. force to realize the parking brake.
- Some electronic parking devices are generally equipped with a deceleration mechanism.
- the power output by the motor needs to be decelerated by the deceleration mechanism to increase the torque and then transmitted to the brake caliper, so that the brake caliper clamps the brake disc;
- the power output by the motor in reverse will also be transmitted to the brake caliper through the deceleration mechanism, so that the brake caliper releases the brake disc.
- the deceleration mechanism Due to the existence of the deceleration mechanism, the structure of the electronic parking device is more complicated, the size is larger, and the noise is more obvious during the process of parking or releasing the parking, which affects the noise, vibration and roughness (noise, vibration) of the vehicle. , harshness, NVH) performance.
- the present application provides a braking system, a vehicle and a control method for the braking system, which simplifies the structure of the braking system and improves the NVH performance of the vehicle on the premise of realizing reliable parking.
- the present application provides a braking system, which may include a brake cylinder, a braking device and a parking device.
- the brake cylinder may include a piston
- the piston is movably disposed in the cylinder
- the first end of the piston may be located inside the brake cylinder
- the second end of the piston may protrude to the outside of the brake cylinder.
- the brake device is connected with the brake cylinder, and the brake device can drive the piston to move.
- the parking device may include a motor and a transmission assembly, the output shaft of the motor may be directly connected to the transmission assembly, the transmission assembly is at least partly arranged in the brake cylinder, and the motor may be used to drive the transmission assembly to move in the brake cylinder, so that the transmission assembly can Contact or separation from the first end of the piston.
- the brake system uses the power assist of the brake device during parking, so that the torque output by the motor of the parking device is small, so the power requirement for the motor is also small, so that on the one hand, the cost of the motor can be reduced.
- the transmission assembly may include a screw and a nut
- the output shaft of the motor may be directly connected to the screw
- the screw may extend into the brake cylinder
- the nut is located in the brake cylinder
- the nut and the screw are screwed together.
- the motor drives the screw to rotate
- the screw can drive the nut to move, so that the nut contacts or separates from the first end of the piston.
- the axial direction of the screw rod can be consistent with the length direction of the cylinder body, so that the moving direction of the nut in the cylinder body is also consistent with the moving direction of the piston, so that when the nut abuts against the first end of the piston, the nut will The force applied to the piston is directed in the same direction as the piston is moving, thereby reducing the risk of piston sticking.
- the first end of the nut can be provided with an opening, the end of the screw can extend into the opening, and the nut is mounted on the end of the screw, so the nut is also located in the opening.
- the motor drives the screw to rotate to drive the nut to move, the nut can abut against the bottom of the hole, so that the piston is applied with a force away from the direction of the motor.
- the braking system may also include a brake caliper and a brake disc, the brake caliper is connected to the second end of the piston, and the brake disc may be arranged in the clamping space of the brake caliper, so that When the piston moves, it can drive the brake caliper to clamp or loosen the brake disc.
- the brake caliper may include two friction blocks opposite to each other.
- the two friction blocks may be respectively arranged on both sides of the brake disc. Move towards or away from each other under the action, thereby changing the size of the clamping space of the brake caliper.
- the braking system may further include a control unit, which may be used to: acquire a parking signal, and control the brake device to drive the piston to move according to the parking signal; when the piston moves to the first position, control the motor The drive transmission assembly moves to a position where it abuts against the first end of the piston.
- a control unit which may be used to: acquire a parking signal, and control the brake device to drive the piston to move according to the parking signal; when the piston moves to the first position, control the motor The drive transmission assembly moves to a position where it abuts against the first end of the piston.
- control unit is further configured to: obtain the hydraulic pressure of the brake cylinder, and when the hydraulic pressure in the brake cylinder is not less than the target hydraulic pressure, the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
- the braking device may include a first hydraulic device and a second hydraulic device, and the first hydraulic device and the second hydraulic device may be respectively connected to the brake cylinder.
- the control unit can also be used to: when the first hydraulic device fails, control the second hydraulic device to drive the piston to move; or, when the second hydraulic device fails, control the first hydraulic device to drive the piston to move; or, when the first hydraulic device fails, When neither the device nor the second hydraulic device fails, the first hydraulic device and the second hydraulic device are controlled to jointly drive the piston to move.
- the first hydraulic device and the second hydraulic device can work together or be redundant with each other, so that even if one of the hydraulic devices fails, it can ensure that the braking device as a whole can continue to operate normally, thereby improving braking performance. device reliability.
- control unit is further configured to: acquire the running state of the vehicle, determine the parking mode of the vehicle according to the running state of the vehicle, and determine the target hydraulic pressure according to the parking mode.
- the target hydraulic pressure can be more accurately determined according to the operating state of the vehicle, thereby enabling the vehicle to reliably apply the parking brake.
- the control unit can also be used to determine the first parking mode when there is no external request for the vehicle and the running state of the vehicle meets the parking conditions.
- the first parking mode can be determined according to the vehicle parameters.
- Vehicle force, the first parking force is the target hydraulic pressure; or, when there is an external request for the vehicle and the vehicle’s running state does not meet the parking conditions, the second parking mode can be determined, and the second parking mode can be determined according to the external request.
- the second parking force is the target hydraulic pressure; or, when there is an external request for the vehicle and the operating conditions of the vehicle meet the parking conditions, the third parking mode is determined, and the first parking mode can be force is the target parking force, or the larger value of the first parking force and the second parking force is the target hydraulic pressure.
- the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
- the vehicle parameters may include one or more of the gradient of the road on which the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, or the temperature of the brake disc.
- the control unit can also be used to: when the vehicle receives the parking command, according to the vehicle speed is less than or equal to the parking speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed Threshold value, the opening degree of the accelerator pedal of the vehicle is less than or equal to the opening degree threshold value, and it is determined that the running state of the vehicle satisfies the parking condition.
- control unit can also be used to: when the vehicle is in a rolling state, control the braking device to drive the piston to move, so that the vehicle can return to a stationary state from the rolling state;
- the motor is controlled to drive the screw to rotate, and the screw drives the nut to move to the position abutting against the first end of the piston, so as to fix the position of the piston and realize the parking brake of the vehicle again.
- the second position is located on a side of the first position away from the first end of the piston.
- the present application also provides a method for controlling a brake system, wherein the brake system may include a brake cylinder, a brake device and a parking device.
- the brake cylinder may include a piston
- the piston is movably disposed in the cylinder
- the first end of the piston may be located inside the brake cylinder
- the second end of the piston may protrude to the outside of the brake cylinder.
- the brake device is connected with the brake cylinder, and the brake device can drive the piston to move.
- the parking device may include a motor and a transmission assembly, the output shaft of the motor may be directly connected to the transmission assembly, the transmission assembly is at least partly arranged in the brake cylinder, and the motor may be used to drive the transmission assembly to move in the brake cylinder, so that the transmission assembly can Contact or separation from the first end of the piston.
- This control method can include:
- control the brake device to drive the piston to move
- control motor drives the transmission assembly to move to a position where it abuts against the first end of the piston.
- the torque output by the motor of the parking device is relatively small through the power assist of the braking device, so the power requirement for the motor is also small.
- the motor can be reduced.
- the deceleration mechanism used for torque boosting can be omitted in the parking device, so that the structure of the parking device can be simplified, and the overall NVH performance of the vehicle can be improved.
- control method may further include: obtaining the hydraulic pressure of the brake cylinder, and when the hydraulic pressure in the brake cylinder is not less than the target hydraulic pressure, the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
- the braking device may include a first hydraulic device and a second hydraulic device, and the first hydraulic device and the second hydraulic device may be respectively connected to the brake cylinder.
- Controlling movement of the braking device to the drive piston may include:
- the first hydraulic device fails, control the second hydraulic device to drive the piston to move; or, when the second hydraulic device fails, control the first hydraulic device to drive the piston to move; or, when the first hydraulic device and the second hydraulic device
- the first hydraulic device and the second hydraulic device are controlled to jointly drive the piston to move. That is to say, the first hydraulic device and the second hydraulic device can work together or be redundant with each other, so that even if one of the hydraulic devices fails, it can ensure that the braking device as a whole can continue to operate normally, thereby improving braking performance. device reliability.
- control method may also include:
- the running state of the vehicle is acquired, the parking mode of the vehicle is determined according to the running state of the vehicle, and the target hydraulic pressure is determined according to the parking mode.
- the target hydraulic pressure can be more accurately determined according to the operating state of the vehicle, thereby enabling the vehicle to reliably apply the parking brake.
- the parking mode of the vehicle is determined according to the running state of the vehicle, and the target hydraulic pressure is determined according to the parking mode, which may specifically include:
- the first parking mode determines the first parking force according to the vehicle parameters, and the first parking force is the target hydraulic pressure
- the third parking mode is determined.
- the first parking force can be used as the target hydraulic pressure, or the first parking force and the second parking force
- the maximum value in is the target hydraulic pressure.
- control method may also include:
- the vehicle's running speed is determined according to the vehicle speed being less than or equal to the parking speed threshold, the vehicle's wheel speed being less than or equal to the parking wheel speed threshold, and the vehicle's accelerator pedal opening being less than or equal to the opening threshold.
- control method may also include:
- the braking device When the vehicle is in a rolling state, the braking device is controlled to drive the piston to move, so that the vehicle returns to a stationary state from the rolling state;
- the control motor drives the transmission assembly to move to a position where it abuts against the first end of the piston, so as to fix the position of the piston and realize the parking brake of the vehicle again, wherein the first The second position is located on a side of the first position away from the first end of the piston.
- the present application further provides a computing device, the computing device includes a processor, configured to implement the method described in the second aspect above.
- the computing device may also include memory for storing program instructions and data.
- the memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, the method described in the second aspect above can be implemented.
- the communication device may further include a communication interface, which is used for the device to communicate with other devices.
- the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces.
- the embodiment of the present application also provides a computer-readable storage medium, where a computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is run on a computer, the The computer implements the method provided in the second aspect above.
- the embodiment of the present application further provides a computer program, which enables the computer to implement the method provided in the above second aspect when the computer program is run on the computer.
- the present application also provides a brake system control device, which may include an acquisition unit and a processing unit, wherein:
- the acquiring unit is used to acquire a parking signal
- the processing unit is used to control the brake device to drive the piston of the brake cylinder to move according to the parking signal, the piston has a first end located in the brake cylinder, and a first end extending out of the brake cylinder. second end; when the second end of the piston moves to the first position, the motor-driven transmission assembly that controls the parking device moves to a position where it abuts against the first end of the piston, wherein the transmission assembly At least partially within the brake cylinder.
- the processing unit can also be used to:
- the processing unit can be used specifically for:
- the acquiring unit can also be used to acquire the running state of the vehicle
- the processing unit is further configured to: determine a parking mode of the vehicle according to the running state of the vehicle, and determine the target hydraulic pressure according to the parking mode.
- the processing unit can also be used to:
- the vehicle When the vehicle does not have the external request, and the running state of the vehicle satisfies the parking condition, determine the first parking mode, determine the first parking force according to the vehicle parameters, and the first parking force is the specified the stated target hydraulic pressure; or,
- determine a third parking mode determine that the first parking force is the target hydraulic pressure, or determine the The larger value of the first parking force and the second parking force is the target hydraulic pressure.
- the processing unit can also be used to:
- the vehicle speed of the vehicle is less than or equal to the parking speed threshold
- the wheel speed of the vehicle is less than or equal to the parking wheel speed threshold
- the accelerator pedal opening of the vehicle is less than or equal to The opening threshold is used to determine that the running state of the vehicle satisfies the parking condition.
- the processing unit can also be used to:
- the second position is located on a side of the first position away from the first end of the piston.
- the present application also provides a vehicle.
- the vehicle may include wheels and a braking system in any of the aforementioned possible technical solutions.
- the braking system is connected to the wheels in transmission so as to apply braking force to the wheels so that the vehicle can achieve Parking brake or release brake.
- the structure of the brake system of the vehicle is relatively simple, and the NVH performance of the vehicle is also improved.
- FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application.
- Fig. 2 is a partial structural schematic diagram of the braking system provided by the embodiment of the present application.
- Fig. 3 is a schematic structural diagram of the brake device provided by the embodiment of the present application.
- Fig. 4 is a schematic diagram of the working conditions of the braking system provided by the embodiment of the present application.
- FIG. 5 is a flow chart of a control method of a braking system provided by an embodiment of the present application.
- Fig. 6 is the specific flowchart of step 101 shown in Fig. 5;
- FIG. 7 is a specific flowchart of step 102 shown in FIG. 5;
- FIG. 8 is a specific flowchart of step 103 shown in FIG. 5;
- FIG. 9 is a schematic structural diagram of a brake system control device provided by an embodiment of the present application.
- 313-pedal feeling simulator 314-oil pot; 315-travel sensor; 321-second controller; 322-three-phase motor;
- 323-electric cylinder 324-motor position sensor; 40-brake pedal; 1100-computing equipment; 1110-processor;
- FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application.
- a vehicle 1 may include a powertrain system 100 , a braking system 200 and wheels 300 .
- the powertrain system 100 can be connected in transmission with the wheels 300 to provide driving force to the wheels 300 to drive the vehicle 1 to run.
- the braking system 200 may include a braking device, a parking device and a brake, wherein the brakes may be provided in one-to-one correspondence with the wheels 300, and each brake may be provided on a corresponding wheel.
- the braking device can be respectively connected with the brakes at each wheel 300 , and the brakes can provide braking force to the wheels 300 so as to stop the running vehicle 1 .
- the parking devices can also be arranged in one-to-one correspondence with the wheels 300, and each parking device can be connected with the brake transmission at the corresponding wheel 300, and the brake 300 can provide a parking force to the wheels to avoid the vehicle 1 that is parked from slipping. Phenomenon.
- the vehicle 1 can be a fuel vehicle.
- the powertrain system 100 can specifically include components such as an engine, a speed reducer, and a transmission.
- the driving force output by the engine can be transmitted to the speed reducer. After the torque acts, it is transmitted to the transmission, and then the transmission is shifted according to the gear setting of the vehicle 1 and then output to the wheels 300 to drive the vehicle 1 to travel.
- the vehicle 1 can also be an electric vehicle.
- the powertrain system 100 can specifically include a motor and a reducer, and the driving force output by the motor can be transmitted to the reducer. Then output to the wheel 300 to drive the vehicle 1 to travel.
- FIG. 2 is a schematic diagram of a partial structure of a braking system provided by an embodiment of the present application.
- the brake 10 may include a brake cylinder 11 , a brake caliper 12 and a brake disc (not shown in the figure).
- the brake cylinder may include a cylinder body 111 and a piston 112 , the piston 112 is movably disposed in the cylinder body 111 , and the piston 112 is disposed in contact with the inner wall of the cylinder body 111 .
- one end of the cylinder body 111 can be a closed end, and the other end can be an open end, and the first end 1121 of the piston 112 can be arranged toward the closed end of the cylinder body 111, and forms a gap with the closed end of the cylinder body 111.
- the second end 1122 of the piston 112 can protrude to the outside of the brake cylinder 11 through the open end of the cylinder body 111 .
- the brake caliper 12 is connected to the second end 1122 of the piston 112 , the brake disc can be disposed in the clamping space 121 of the brake caliper 12 , and the brake disc is fixedly connected to the wheel.
- the second end 1122 of the piston 112 can drive the brake caliper 12 to clamp or loosen the brake disc, so that when the brake caliper 12 clamps the brake disc,
- the brake disc applies braking force to realize braking or parking braking of the vehicle, and release the brake of the vehicle when the brake caliper 12 releases the brake disc.
- the brake caliper 12 may include two friction blocks 122 arranged oppositely, and the two friction blocks 122 may be respectively arranged on two sides of the brake disc.
- the two friction blocks 122 are connected by a connecting piece, and the two friction blocks 122 can move toward or away from each other under the action of an external force. It can be understood that the gap between the two friction blocks 122 is the brake caliper.
- the clamping space 121 is the clamping space 121.
- the relationship between the moving direction of the piston 112 and the working state of the brake caliper 12 can be specifically as follows: when the piston 112 moves away from the closed end of the cylinder 111, the two sides of the brake caliper 12 The friction blocks 122 move toward each other, that is, the clamping space 121 of the brake caliper 12 is reduced, so that the brake caliper 12 can clamp the brake disc when the piston 112 moves to a certain position; When the direction moves, the two friction blocks 122 of the brake caliper 12 move away from each other, that is, the clamping space 121 of the brake caliper 12 increases, and the brake caliper 12 can release the brake disc at this time.
- the parking device 20 may include a motor 21 and a transmission assembly, the motor 21 is located outside the brake cylinder, the transmission assembly is directly connected to the output shaft of the motor 21, and the transmission assembly may be at least partially located in the brake cylinder 11 .
- the transmission assembly can be a structure capable of changing rotational motion into linear motion, so that when the output shaft of the motor 21 rotates, it can drive the part of the transmission assembly located in the brake cylinder 11 to move.
- the transmission assembly may include a screw 22 and a nut 23 , wherein one end of the screw 22 is directly connected to the output shaft of the motor 21 , and the other end can extend into the sealed chamber 1111 of the cylinder 111 .
- the closed end of the cylinder body 111 may be provided with a through hole, and the screw rod 22 may extend into the sealed cavity 1111 through the through hole.
- the nut 23 is disposed in the sealing cavity 1111 , and the nut 23 is mounted on the screw rod 22 , that is, the nut 23 and the screw rod 22 are screwed together.
- the motor 21 drives the screw rod 22 to rotate
- the nut 23 installed on the screw rod 22 can move along the axial direction of the screw rod 22 .
- the axial direction of the screw rod 22 may be consistent with the length direction of the cylinder body 111 , so that the movement direction of the nut 23 in the cylinder body 111 is consistent with the movement direction of the piston 112 .
- the moving direction of the nut 23 is determined by the direction of rotation of the motor 21, and the nut 23 can be moved to the right or left by controlling the forward and reverse rotation of the motor 21, and the rightward movement here means moving away from the cylinder body.
- the direction of the closed end of the cylinder 111 moves, and the movement to the left is moving towards the direction close to the closed end of the cylinder 111 .
- it can be set that when the motor 21 rotates forward, the nut 23 moves to the right, and when the motor 21 rotates reversely, the nut 23 moves to the left.
- the nut 23 can be installed on the end of the screw rod 22.
- the nut 23 can be a cap-shaped structure with one end closed, so that after the nut 23 is installed on the screw rod 22, the closed end of the nut 23 can be Always protrudes beyond the end of the screw 22 .
- the first end 1121 of the piston 112 may be provided with an opening 1123 , and the end of the screw 22 may extend into the opening 1123 , and the nut 23 is also located in the opening 1123 .
- the brake device may specifically control the action of the brake 10 in a hydraulically driven manner.
- the braking device can be connected with the sealing chamber 1111 of the brake cylinder 11 , and the piston 112 is driven to move left and right by controlling the oil flow flowing into the sealing chamber 1111 , and the piston 112 controls the working state of the brake caliper 12 .
- the hydraulic pressure in the sealing chamber 1111 increases, and the piston 112 can move to the right, thereby driving the brake caliper 12 to clamp the brake.
- the hydraulic pressure in the sealing chamber 1111 decreases, and the piston 112 can move to the left, thereby releasing the braking force. Braking force applied by the disc.
- Fig. 3 is a schematic structural diagram of a braking device provided by an embodiment of the present application.
- the brake device 30 may include two sets of hydraulic devices, namely a first hydraulic device 31 and a second hydraulic device 32 .
- the first hydraulic device 31 may specifically be an intelligent braking system (intelligent braking system, IBS), and the second hydraulic device 32 may specifically be a redundant brake unit (redundant brake unit, RBU).
- the first hydraulic device 31 and the second hydraulic device 32 are respectively connected to the brake cylinders of the brakes, and the two can cooperate to control the work of the brakes to improve the control accuracy of the pressure in the brake cylinders, and the other two can also independently control the work of the brakes. That is, the first hydraulic device 31 and the second hydraulic device 32 can be redundant with each other, so that even if one of the hydraulic devices fails, the brake device 30 as a whole can continue to operate normally, thereby improving the reliability of the brake device 30 sex.
- the first hydraulic device 31 may include a first controller 311, a master cylinder 312, a pedal feeling simulator 313, an oil pot 314, a stroke sensor 315, a liquid level sensor, a solenoid valve, a one-way valve and a brake pipeline etc.
- the second hydraulic device 32 may include a second controller 321, a three-phase motor 322, an electric cylinder 323, a motor position sensor 324, a solenoid valve, a one-way valve, a pressure sensor, and a brake pipeline.
- the braking device may at least include various solenoid valve drives, motor drives, and various signal processing and control output interfaces.
- the first controller 311 and the second controller 321 can receive the measurement or detection signals of various sensors, such as environmental conditions, driver input, braking system status and other information, and control the braking of the braking device 30 through calculation and judgment. characteristic.
- the first controller 311 can control solenoid valve a and solenoid valve b to open, and control solenoid valve c and solenoid valve d to close, and the brake pedal 40 pushes the master cylinder 312
- the oil in the valve flows into the pedal feeling simulator 313 through the solenoid valve b, and the first controller 311 collects the signal of the stroke sensor 315, the signal of the pressure sensor at the master cylinder 312 and the liquid level signal of the oil pot 314, and transmits them to the second controller 321 .
- the second controller 321 determines the driver's braking intention according to the stroke sensor 315 signal transmitted by the first controller 311 and the pressure sensor signal at the master cylinder 312, and controls the three-phase motor 322 to push the piston in the electric cylinder 323 to move to the right , and control solenoid valve e, solenoid valve f, solenoid valve g, solenoid valve h, solenoid valve i, solenoid valve j, solenoid valve k, solenoid valve l to open, a part of the oil in the right chamber of electric cylinder 323 is divided into two circuits, One way of oil flows into the brake cylinders at two of the wheels (ie, the front left (FL) wheel and the rear right (RR) wheel) through the opened solenoid valve e, solenoid valve f and solenoid valve g, and the other All the oil flows into the brake cylinders at the other two wheels (rear left (RL) wheel and front right (FR) wheel) through the opened solenoid valve h
- the second controller 321 can control the solenoid valve connected to the electric cylinder and the master cylinder at the brake cylinder (that is, the above-mentioned solenoid valve f, One of solenoid valve g, solenoid valve i, solenoid valve j) is closed, and controls the solenoid valve connected to the oil pot 314 at the brake cylinder (solenoid valve m, solenoid valve n, solenoid valve o, solenoid valve p One of them) is opened, so that the oil in the brake cylinder flows into the oil pot 314 to realize decompression.
- solenoid valve connected to the electric cylinder and the master cylinder at the brake cylinder that is, the above-mentioned valve f, One of solenoid valve g, solenoid valve i, solenoid valve j
- solenoid valve connected to the oil pot 314 at the brake cylinder solenoid valve m, solenoid valve n, solenoid valve o, solenoid valve p One of them
- the solenoid valve f can be closed, the oil passage between the right chamber of the electric cylinder 323 and the brake cylinder at the wheel FL can be cut off, and the solenoid valve m can be opened. , so that the oil in the brake cylinder at the wheel FL flows into the oil pot through the solenoid valve m.
- the first controller 311 can control the solenoid valve a, solenoid valve b, solenoid valve c and solenoid valve d to open, and the oil in the master cylinder 312
- One part flows into the brake cylinder at two wheels (ie, FL wheel and RR wheel) through the opened solenoid valve c, solenoid valve f and solenoid valve g, and the other part flows through the opened solenoid valve d, solenoid valve i and solenoid valve j It flows into the brake cylinders at the other two wheels (ie, RL wheels and FR wheels), thereby achieving braking of four wheels.
- the first controller 311 can collect the signal of the travel sensor 315 and the liquid level signal of the oil pot 314, and transmit it to the second controller through the signal interface. device 312.
- the second controller 312 controls the three-phase motor 322 to push the piston in the electric cylinder 323 to move to the right according to the stroke sensor 315 signal transmitted by the first controller 311, and controls the solenoid valve e, solenoid valve f, solenoid valve g, solenoid valve h.
- Solenoid valve i, solenoid valve j, solenoid valve k, solenoid valve l are opened, a part of the oil in the right chamber of the electric cylinder 323 is divided into two paths, and one path of oil passes through the opened solenoid valve e, solenoid valve f and solenoid valve g It flows into the brake cylinders at two of the wheels (ie, FL wheels and RR wheels), and the other oil flows into the other two wheels (ie, RL wheels and FR wheels) through the opened solenoid valve h, solenoid valves i and solenoid valves j The brake cylinder at the place, so as to realize the braking of the four wheels; another part of the oil in the right chamber of the electric cylinder 323 flows into the left chamber of the electric cylinder 323 through the opened solenoid valve k and solenoid valve l.
- the braking system 200 can also include a control unit, which can be electrically connected to the braking device 30 and the parking device 20 respectively.
- the control unit can be used to obtain The parking signal of the vehicle, and then control the brake device 30 to drive the piston 112 to move according to the parking signal, so as to apply braking force to the brake disc, and when the second end 1122 of the piston 112 moves to the first position, control the motor 21 Drive the screw rod 22 to rotate to drive the nut 23 to move through the screw rod 22, so that the nut 23 abuts against the first end 1121 of the piston 112, that is, the closed end of the nut 23 abuts against the bottom of the opening of the piston 1123, thereby the piston 112 is fixed at the current position, and then the brake caliper 12 is kept in the working state of clamping the brake disc to realize the parking brake of the vehicle.
- control unit can also be used to obtain the hydraulic pressure in the brake cylinder 11 (that is, the hydraulic pressure in the sealed cavity 1111), and when it is determined that the hydraulic pressure in the brake cylinder 11 is not less than the target hydraulic pressure, control the first position of the piston 112.
- the two ends 1122 move to the first position. That is to say, when the braking system in the present application is performing parking braking, the braking device 30 is firstly used to generate a corresponding target hydraulic pressure to push the piston 112 to move, so that the brake caliper 12 clamps the brake disc, and then The motor 21 is controlled to drive the nut 23 to move, so that the nut 23 pushes to a position where it abuts against the piston 112 .
- the torque output by the motor 21 of the parking device 20 is relatively small when parking, so the power requirement for the motor 21 is also small, so that the cost of the motor 21 can be reduced on the one hand, and on the other hand
- the deceleration mechanism used for torque boosting can be omitted, so that the structure of the parking device 20 can be simplified, and the overall NVH performance of the vehicle can be improved.
- the control unit can control the motor 21 to stop working, and then control the braking device 30 to stop applying the braking force to the brake disc. That is, the first hydraulic device 31 and the second hydraulic device 32 are controlled to withdraw from pressure build-up. At this time, the brake caliper 12 can clamp the brake disc completely by the abutment effect of the nut 23 .
- control unit can also be used to: when it is determined that the first hydraulic device 31 fails, control the second hydraulic device 32 to drive the piston to move; similarly, when it is determined that the second hydraulic device 32 fails, control The first hydraulic device 31 drives the piston to move; and, when it is determined that neither the first hydraulic device 31 nor the second hydraulic device 32 fails, control the first hydraulic device 31 and the second hydraulic device 32 to jointly drive the piston to move .
- the first hydraulic device 31 and the second hydraulic device 32 can be mutually redundant. When one of the hydraulic devices fails, the other can continue to work, thereby ensuring that the vehicle completes the entire parking action and meets the requirements of the vehicle operation. Functional safety requirements.
- control unit can also be used to: acquire the running state of the vehicle, determine the parking mode of the vehicle according to the running state of the vehicle, and then determine the target hydraulic pressure according to the parking mode.
- target hydraulic pressure of the vehicle determines the position of the second end of the piston, and further determines the force on the brake disc when the vehicle is kept in a parked state.
- the target hydraulic pressure of the vehicle is related to the running state of the vehicle. For example, whether there is an external request for the vehicle, and information such as the vehicle speed and wheel speed directly affect the target parking force.
- the control unit can also be used to: determine whether there is an external request for the vehicle; if it is determined that there is no external request for the vehicle and the running state of the vehicle meets the parking conditions, determine that the vehicle is in the first parking mode, At this time, the first parking force can be determined according to the vehicle parameters, and the first parking force is the target hydraulic pressure; or, if it is determined that the vehicle has an external request and the running state of the vehicle does not meet the parking conditions, it is determined that the vehicle is the first hydraulic pressure.
- the second parking force can be determined according to the external request, and the second parking force is the target hydraulic pressure; or, if it is determined that the vehicle has an external request and the operating conditions of the vehicle meet the parking conditions, It is determined that the vehicle is in the third parking mode.
- the first parking force may be used as the target hydraulic pressure, or the larger value of the first parking force and the second parking force may be used as the target hydraulic pressure.
- the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
- the parking conditions of the vehicle include whether the vehicle receives a parking command and whether the vehicle speed, wheel speed, and opening of the accelerator pedal meet the requirements.
- the vehicle parameters may include one or more of the slope of the road where the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, and whether the temperature of the brake disc is greater than or equal to a temperature threshold.
- the control unit can also be used to: when it is determined that the vehicle has received a parking command, according to the vehicle speed of the vehicle is less than or equal to the parking speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed The speed threshold, the wheel speed of the vehicle is less than or equal to the parking wheel speed threshold, the accelerator pedal opening of the vehicle is less than or equal to the opening threshold, etc., to determine that the running state of the vehicle meets the parking conditions.
- the parking command can be specifically issued by the driver, and the cockpit of the vehicle can be provided with a parking control button, which can be electrically connected to the control unit, and the driver can issue a parking command by activating the parking control button. Park command.
- the vehicle speed and the wheel speed meet the threshold requirement.
- the vehicle speed is equal to the wheel speed.
- the wheel speed can also meet the corresponding threshold requirements. However, if the wheels move, The speed of the vehicle and the speed of the wheels are no longer equal.
- parameter values such as the parking vehicle speed threshold, the parking wheel speed threshold, and the opening of the accelerator pedal can be determined through experiments, or can also be obtained through experience, which is not specifically limited in the present application.
- control unit can also be used to identify whether the vehicle is in a rolling state based on information such as the vehicle's wheel speed and driving direction, and control the braking when it is determined that the vehicle is in a rolling state
- the device 30 drives the piston to move to apply a braking force to the brake disc, so that the vehicle returns to a stationary state from a rolling state.
- the control unit can control the motor 21 to drive the screw 22 to rotate, so that the nut 23 also moves to abut against the first end 1121 of the piston 112 again, so as to fix the piston 112 In the position after the shift, parking braking of the vehicle is effected again. It can be understood that, compared with the first parking brake, the position of the piston 112 will shift to the right to a certain extent, that is, the above-mentioned second position is located on the side of the first position away from the nut.
- the control unit can control the brake device 30 to continue to drive the piston 112 to move, so that the second end 1122 of the piston 112 moves to the third position, and the third position is located at the distance from the nut 23 of the first position.
- One side of the first position that is, the right side of the first position, so that a certain gap is formed between the nut 23 and the first end 1121 of the piston 112, thereby releasing the load of the motor 21, so that the motor 21 can rotate forward or reverse smoothly.
- the control unit can control the reverse rotation of the motor 21, so that the nut 23 returns to the initial position, and finally control the brake device 30 to stop building pressure, so that the vehicle releases the parking brake.
- the third position to which the second end of the piston 112 is moved by the brake device 30 should be located at the second position right side, to ensure that a gap can be formed between the nut 23 and the first end 1121 of the piston 112 .
- Fig. 4 is a schematic diagram of working conditions of the braking system provided by the embodiment of the present application.
- the braking device 30 drives the piston 112 to move to the right, and the piston 112 drives the brake caliper 12 to gradually clamp the brake. disc, the hydraulic pressure in the sealed cavity 1111 gradually increases, and the driver can activate the parking control button during this process.
- the hydraulic pressure of the sealing chamber 1111 increases to equal to the target hydraulic pressure, the motor 21 starts, and the rotational speed of the motor 21 can first increase and then decrease to drive the nut 23 to move to the right.
- the braking device 30 drives the piston 112 to move to the right again until the second end 1122 of the piston 112 moves to the second position, so that the vehicle returns to a stationary state from the rolling state. state.
- the motor 21 is started to drive the nut 23 to move to the position abutting against the piston 112 again, so as to realize the parking brake of the vehicle again.
- the motor 21 stops working, the braking device 30 withdraws from the pressure build-up, and the hydraulic pressure in the sealing chamber 1111 gradually decreases to zero.
- the clamping force on the brake disc will increase correspondingly and finally maintain a constant value.
- An embodiment of the present application also provides a method for controlling a braking system, wherein the structure of the braking system may refer to the description in the preceding embodiments, and details are not repeated here.
- the control method may include the following steps:
- the motor-driven transmission assembly that controls the parking device moves to a position where it abuts against the first end of the piston.
- control method may also include:
- the second end of the control piston moves to the first position. It can be understood that the first position is the position where the second end of the piston is when the brake caliper clamps the brake disc to stop the rotation of the brake disc.
- the braking device when performing parking braking, the braking device is first used to generate a corresponding braking force, so that the brake caliper clamps the brake disc, and then the motor is controlled to drive the nut to move. Push the nut up against the piston.
- the torque output by the motor of the parking device is small when parking, so the power requirement for the motor is also small.
- the cost of the motor can be reduced, and on the other hand, it can also be used in the parking device.
- the deceleration mechanism used for torque boosting is omitted, which not only simplifies the structure of the parking device, but also improves the overall NVH performance of the vehicle.
- control method of the braking system may further include:
- the first hydraulic device and the second hydraulic device are controlled to drive the piston to move.
- the first hydraulic device and the second hydraulic device can be mutually redundant.
- the other can continue to work, thereby ensuring that the vehicle completes the entire parking action and meets the functional safety of the vehicle operation. need.
- the parking mode of the vehicle can be judged according to the running state of the vehicle, and then the target hydraulic pressure can be calculated according to the determined parking mode. And, after the vehicle completes the parking brake, it is still possible for the vehicle to roll under the influence of the external environment or the action of an external force.
- the above control method may also include the step of a safety mode control strategy, so that the rolling occurs The car's vehicle is parked again. Based on this, please refer to FIG. 5 , the method for controlling the braking system provided by the embodiment of the present application may specifically include the following steps:
- Step S101 judging the parking mode
- Step S102 determining the target hydraulic pressure according to the parking mode of the vehicle
- Step S103 normal control mode, including controlling the braking device to drive the piston to move, and controlling the motor to drive the transmission assembly to move;
- Step S104 when the vehicle is in a rolling state, control the brake system to enter a control strategy of a safe mode.
- FIG. 6 is a specific flowchart of step 101 shown in FIG. 5 .
- step S101 may specifically include:
- Step S1011 if it is determined that there is no external request for the vehicle and the running state of the vehicle satisfies the parking condition, determine that the vehicle is in the first parking mode;
- Step S1012 if it is determined that the vehicle has an external request and the running state of the vehicle does not meet the parking condition, determine that the vehicle is in the second parking mode;
- Step S1013 if it is determined that the vehicle has an external request, and the running state of the vehicle satisfies the parking condition, determine that the vehicle is in the third parking mode.
- the external request of the vehicle includes, but is not limited to, that the vehicle is in an intelligent driving mode, an anti-lock brake mode, or a driving assistance mode, and the like.
- the parking conditions of the vehicle include whether the vehicle receives a parking command and whether the vehicle speed, wheel speed, and opening of the accelerator pedal meet the requirements.
- determining that the running state of the vehicle meets the parking condition may specifically include:
- the vehicle's wheel speed is less than or equal to the parking wheel speed threshold
- the vehicle's wheel speed is less than or equal to the parking wheel speed threshold
- the vehicle's accelerator pedal The opening degree is less than or equal to the opening degree threshold and other information.
- the parking condition is not met. For example, if the vehicle does not receive a parking command, the following three conditions (vehicle speed, wheel speed and accelerator pedal opening) do not need to be judged, that is, it is determined that the running state of the vehicle does not meet the parking condition. When it is determined that the vehicle has received a parking instruction, and the vehicle speed is not less than or equal to the parking speed threshold, then the other two conditions (wheel speed and accelerator pedal opening) do not need to be judged, that is, it is determined that the running state of the vehicle is not Meet the parking conditions, and so on.
- vehicle speed wheel speed and accelerator pedal opening
- FIG. 7 is a specific flowchart of step S102 shown in FIG. 5 .
- step 102 may specifically include:
- Step S1021 when the vehicle is in the first parking mode, determine the first parking force according to the vehicle parameters, and the first parking force is the target hydraulic pressure;
- Step S1022 when the vehicle is in the second parking mode, determine the second parking force according to the external request, and the second parking force is the target hydraulic pressure;
- Step S1023 when the vehicle is in the third parking mode, the first parking force may be determined as the target hydraulic pressure, or the larger of the first parking force or the second parking force may be determined as the target hydraulic pressure.
- the vehicle parameters may include one or more of the slope of the road where the vehicle is located, the mass of the vehicle, whether the vehicle is attached with a trailer, and whether the temperature of the brake disc is greater than or equal to a temperature threshold.
- FIG. 8 is a specific flowchart of step S103 shown in FIG. 5 .
- step S103 may specifically include:
- Step S1031 controlling the braking device to drive the piston to move
- Step S1032 judging whether the second end of the piston has moved to the first position, if yes, execute step S1033, if not, return to execute step S1031;
- Step S1033 controlling the motor to drive the transmission assembly to move in a direction close to the first end of the piston;
- Step S1034 judging whether the transmission assembly is in contact with the first end of the piston, if yes, execute step S1035, if not, return to execute step 1033;
- Step S1035 end control.
- step S104 may specifically include:
- control the brake device to drive the piston to move to the second position.
- the second position is located at the first position away from the nut.
- One side of the brake caliper will clamp the brake disc again under the push of the piston, and then the vehicle will return to a stationary state from a rolling state.
- the motor is controlled to drive the screw to rotate, and the screw drives the nut to move to a position where it abuts against the first end of the piston, so as to realize parking braking of the vehicle again.
- the embodiment of the present application also provides a computing device 1100 .
- the computing device 1100 may be a chip or a system on a chip.
- the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
- the computing device 1100 may include at least one processor 1110, and the processor 1110 is coupled with a memory.
- the memory may be located within the device, the memory may be integrated with the processor, or the memory may be located outside the device.
- Computing device 1100 may also include at least one memory 1120 , for example.
- the memory 1120 stores necessary computer programs, configuration information, computer programs or instructions and/or data for implementing any of the above embodiments; the processor 1110 can execute the computer programs stored in the memory 1120 to complete the method in any of the above embodiments.
- the computing device 1100 may further include a communication interface 1130, and the computing device 1100 may perform information exchange with other devices through the communication interface 1130.
- the communication interface 1130 may be a transceiver, a circuit, a bus, a module, a pin or other types of communication interfaces.
- the communication interface 1130 in the device 1100 can also be an input and output circuit, which can input information (or call, receive information) and output information (or call, send information)
- the processor is an integrated processor or a microprocessor or an integrated circuit or a logic circuit, and the processor can determine output information according to input information.
- the coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
- the processor 1110 may cooperate with the memory 1120 and the communication interface 1130 .
- a specific connection medium among the processor 1110, the memory 1120, and the communication interface 1130 is not limited.
- the bus 1140 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus or the like.
- PCI peripheral component interconnect
- EISA extended industry standard architecture
- the bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 9 , but it does not mean that there is only one bus or one type of bus.
- the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or Various methods, steps, and logic block diagrams for executing the application embodiments in the embodiments of the present application.
- a general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method in the embodiments of the application in combination with the embodiments of the present application may be directly implemented by a hardware processor, or executed by a combination of hardware and software modules in the processor.
- the memory may be a non-volatile memory, such as a hard disk (hard disk drive, HDD) or a solid-state drive (solid-state drive, SSD), etc., and may also be a volatile memory (volatile memory), such as Random-access memory (RAM).
- a memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
- the memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data.
- the computing device 1100 can be applied to the sending end, and the specific computing device 1100 can be the sending end, or can be a device capable of supporting the sending end and realizing the function of the sending end in any of the above-mentioned embodiments .
- the memory 1120 stores necessary computer programs, computer programs or instructions and/or data for realizing the functions of the sending end in any of the above-mentioned embodiments.
- the processor 1110 may execute the computer program stored in the memory 1120 to complete the method performed by the sending end in any of the foregoing embodiments.
- the communication interface in the computing device 1100 can be used to interact with the receiving end, such as sending information to the receiving end.
- the computing device 1100 can be applied to the receiving end, and the specific computing device 1100 can be the receiving end, or it can support the receiving end to realize the functions of the receiving end in any of the above-mentioned embodiments. device.
- the memory 1120 stores necessary computer programs, computer programs or instructions and/or data for realizing the functions of the receiver in any of the above-mentioned embodiments.
- the processor 1110 may execute the computer program stored in the memory 1120 to complete the method executed by the receiving end in any of the foregoing embodiments.
- the communication interface in the computing device 1100 can be used to interact with the sending end, such as receiving information from the sending end.
- the computing device 1100 provided in this embodiment can be applied to a sending end to complete the method executed by the sending end, or applied to a receiving end to complete the method executed by the receiving end. Therefore, the technical effects that can be obtained can refer to the above-mentioned method embodiments, and will not be repeated here.
- an embodiment of the present application further provides a computer program that, when the computer program is run on a computer, enables the computer to implement the method provided in any one of the embodiments shown in FIG. 5 to FIG. 8 .
- this embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a computer, the computer can realize the steps shown in FIG. 5 to FIG. 8 .
- the storage medium may be any available medium that can be accessed by a computer.
- Computer-readable media may include RAM, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD- ROM or other optical disk storage, magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
- the technical solutions provided by the embodiments of the present application may be fully or partially implemented by software, hardware, firmware or any combination thereof.
- software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
- the computer program product includes one or more computer instructions.
- the computer program instructions When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
- the computer may be a general computer, a special computer, a computer network, an access network device, a terminal device or other programmable devices.
- the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
- the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
- the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium.
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Abstract
Description
Claims (24)
- 一种制动系统,其特征在于,包括制动缸、制动装置和驻车装置,其中:所述制动缸包括活塞,所述活塞的第一端位于所述制动缸内,所述活塞的第二端伸出所述制动缸;所述制动装置与所述制动缸连接,用于驱动所述活塞移动;所述驻车装置包括电机和传动组件,所述电机与所述传动组件直接连接,所述传动组件至少部分位于所述制动缸内,所述电机用于驱动所述传动组件在所述制动缸内移动。
- 如权利要求1所述的制动系统,其特征在于,所述传动组件包括螺杆和螺母,所述电机的输出轴与所述螺杆直接连接,所述螺杆伸入所述制动缸内,所述螺母设置于所述制动缸且安装于所述螺杆上。
- 如权利要求1或2所述的制动系统,其特征在于,所述制动系统还包括制动钳和制动盘,制动钳与所述活塞的第二端连接,所述制动盘设置于所述制动钳的夹持空间内。
- 如权利要求3所述的制动系统,其特征在于,所述制动系统还包括控制单元,所述控制单元用于:获取驻车信号,根据所述驻车信号控制所述制动装置驱动所述活塞移动;在所述活塞的第二端移动至第一位置时,控制所述电机驱动所述传动组件移动至与所述活塞的第一端抵接的位置。
- 如权利要求4所述的制动系统,其特征在于,所述控制单元还用于:获取所述制动缸内的液压力;当所述制动缸内的液压力大于或等于目标液压力时,控制所述活塞的第二端移动至所述第一位置。
- 如权利要求4或5所述的制动系统,其特征在于,所述第一位置为所述制动钳夹紧所述制动盘时,所述活塞的第二端所在的位置。
- 如权利要求4~6任一项所述的制动系统,其特征在于,所述制动装置包括第一液压装置和第二液压装置,所述第一液压装置和所述第二液压装置分别与所述制动缸连接;所述控制单元还用于:在所述第一液压装置发生故障时,控制所述第二液压装置驱动所述活塞移动;或者,在所述第二液压装置发生故障时,控制所述第一液压装置驱动所述活塞移动;或者,在所述第一液压装置与所述第二液压装置均未发生故障时,控制所述第一液压装置及所述第二液压装置共同驱动所述活塞移动。
- 如权利要求4~7任一项所述的制动系统,其特征在于,所述控制单元还用于:获取车辆的运行状态,根据所述车辆的运行状态确定所述车辆的驻车模式,并根据所述驻车模式确定所述目标液压力。
- 如权利要求8所述的制动系统,其特征在于,所述控制单元还用于:在所述车辆不存在外部请求,且所述车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,所述第一驻车力为所述目标液压力;或者,在所述车辆存在所述外部请求,且所述车辆的运行状态不满足所述驻车条件时,确定第二驻车模式,根据所述外部请求确定第二驻车力,所述第二驻车力为所述目标液压力;或者,在所述车辆存在所述外部请求,且所述车辆的运行条件满足所述驻车条件时,确定第三驻车模式,确定所述第一驻车力为所述目标液压力,或者确定所述第一驻车力与所述第二驻车力中的较大值为所述目标液压力。
- 如权利要求9所述的制动系统,其特征在于,所述控制单元还用于:在所述车辆接收到驻车指令时,根据所述车辆的车速小于或者等于驻车车速阈值、所述车辆的轮速小于或者等于驻车轮速阈值、所述车辆的油门踏板开度小于或者等于开度阈值,确定所述车辆的运行状态满足所述驻车条件。
- 如权利要求9或10所述的制动系统,其特征在于,所述车辆参数包括所述车辆所处道路的坡度、所述车辆的质量、所述车辆是否挂有拖车或所述制动盘的温度中的一项或多项。
- 如权利要求4~11任一项所述的制动系统,其特征在于,所述控制单元还用于:在所述车辆处于溜车状态时,控制所述制动装置驱动所述活塞移动;在所述活塞的第二端移动至第二位置时,控制所述传动组件移动至与所述活塞的第一端抵接的位置;其中,所述第二位置位于所述第一位置远离所述活塞的第一端的一侧。
- 一种制动系统的控制方法,其特征在于,包括:获取驻车信号;根据所述驻车信号控制制动装置驱动制动缸的活塞移动;在所述活塞的第二端移动至第一位置时,控制驻车装置的电机驱动传动组件移动至与所述活塞的第一端抵接的位置。
- 如权利要求13所述的控制方法,其特征在于,所述控制方法还包括:获取所述制动缸内的液压力;当所述制动缸内的液压力大于或等于目标液压力时,控制所述活塞的第二端移动至所述第一位置。
- 如权利要求13或14所述的控制方法,其特征在于,所述第一位置为所述制动系统的制动钳夹紧制动盘时,所述活塞的第二端所在的位置。
- 如权利要求13~15任一项所述的控制方法,其特征在于,所述控制制动装置驱动制动缸的活塞移动,具体包括:在第一液压装置发生故障时,控制第二液压装置驱动所述活塞移动;或者,在所述第二液压装置发生故障时,控制所述第一液压装置驱动所述活塞移动;或者,在所述第一液压装置与所述第二液压装置均未发生故障时,控制所述第一液压装置及所述第二液压装置共同驱动所述活塞移动。
- 如权利要求13~16任一项所述的控制方法,其特征在于,所述控制方法还包括:获取车辆的运行状态,根据所述车辆的运行状态确定所述车辆的驻车模式,并根据所述驻车模式确定所述目标液压力。
- 如权利要求17所述的控制方法,其特征在于,所述控制方法还包括:在所述车辆不存在外部请求,且所述车辆的运行状态满足驻车条件时,确定第一驻车模式,根据车辆参数确定第一驻车力,所述第一驻车力为所述目标液压力;或者,在所述车辆存在所述外部请求,且所述车辆的运行状态不满足所述驻车条件时,确定第二驻车模式,根据所述外部请求确定第二驻车力,所述第二驻车力为所述目标液压力; 或者,在所述车辆存在所述外部请求,且所述车辆的运行条件满足所述驻车条件时,确定第三驻车模式,确定所述第一驻车力为所述目标液压力,或者确定所述第一驻车力与所述第二驻车力中的较大值为所述目标液压力。
- 如权利要求13~18任一项所述的控制方法,其特征在于,所述控制方法还包括:在所述车辆接收到驻车指令时,根据所述车辆的车速小于或者等于驻车车速阈值、所述车辆的轮速小于或者等于驻车轮速阈值、所述车辆的油门踏板开度小于或者等于开度阈值中的一项或多项,确定所述车辆的运行状态满足所述驻车条件。
- 如权利要求13~19任一项所述的控制方法,其特征在于,所述控制方法还包括:在所述车辆处于溜车状态时,控制所述制动装置驱动所述活塞移动;在所述活塞的第二端移动至所述第一位置时,控制所述传动组件移动至与所述活塞的第一端抵接的位置;其中,所述第二位置位于所述第一位置远离所述活塞的第一端的一侧。
- 一种计算设备,其特征在于,包括:处理器,所述处理器和存储器耦合,所述存储器存储有程序指令,所述处理器用于执行所述程序指令,以实现如权利要求13~20任一项所述的方法。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质上存储有指令,当所述指令在计算机上运行时,使得所述计算机实现如权利要求13~20任一项所述的方法。
- 一种计算机程序,其特征在于,包括指令,当所述指令在计算机上运行时,使得所述计算机实现如权利要求13~20任一项所述的方法。
- 一种车辆,其特征在于,包括车轮以及如权利要求1~12任一项所述的制动系统,所述制动系统与所述车轮传动连接。
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